GOST 34028-2016

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  ГОСТ 34028-2016

GOST 34028−2016 rental for prestressed concrete structures. Specifications

GOST 34028−2016

INTERSTATE STANDARD

RENTAL OF REINFORCEMENT FOR REINFORCED CONCRETE STRUCTURES

Specifications

Reinforcing rolled products for reinforced concrete constructions. Specifications

ISS 77.140.15

Date of introduction 2018−01−01

Preface

Goals, basic principles and main procedure of works on interstate standardization established in GOST 1.0−2015 «interstate standardization system. Basic provisions» and GOST 1.2−2015 «interstate standardization system. Interstate standards, rules and recommendations on interstate standardization. Rules of development, adoption, renewal and cancellation"

Data on standard

1 DEVELOPED by the Joint-stock company «nits «stroitelstvo» (JSC «Construction») and Federal state unitary enterprise «tsniichermet im.And.P.Bardina» (FSUE «tsniichermet im.And.P.Bardeen»)

2 as AMENDED by the Federal Agency for technical regulation and Metrology

3 ACCEPTED by the Interstate Council for standardization, Metrology and certification (Protocol of December 8, 2016 N 50)

The adoption voted:

Short name of the country on MK (ISO 3166) 004−97	Country code MK (ISO 3166) 004−97	Abbreviated name of the national authority for standardization
Armenia	AM	Ministry Of Economy Of The Republic Of Armenia
Georgia	GE	Gosstandart
Kyrgyzstan	KG	Kyrgyzstandard
Russia	EN	Rosstandart
Tajikistan	TJ	Tajikstandart

4 by Order of the Federal Agency for technical regulation and Metrology dated 31 March 2017 N 232-St inter-state standard GOST 34028−2016 introduced as a national standard of the Russian Federation from 1 January 2018.

5 this standard was developed based on the application of GOST R 52544−2006 in part of hot-rolled and thermomechanical reinforced reinforcing bar*
________________
* By order of the Federal Agency for technical regulation and Metrology dated 31 March 2017 N 232-St GOST R 52544−2006 in part of hot-rolled and thermo-mechanically hardened rebars abolished from 1 January 2018.

6 REPLACE GOST 5781−82, GOST 10884−94


Information about the changes to this standard is published in the annual reference index «National standards» (as of January 1 of the current year), and the text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet (www.gost.ru)

1 Scope

This standard applies to rebar smooth and periodic profile class A240, A400, A500 and A600, designed for use in the reinforcement of precast concrete structures and in the construction of monolithic reinforced concrete, and rebar periodic profile class Ап600, A800 and A1000, designed for use in the reinforcement of prestressed concrete structures.

Reinforcement bars are made of non-alloy and alloy steel.

This standard sets out the standard technical requirements for reinforcement products, as well as an additional set of technical requirements depending on its purpose.

2 Normative references

This standard uses the regulatory references to the following international standards:

GOST 8.051−81 State system for ensuring the uniformity of measurements. Error allowed when measuring linear dimensions to 500 mm

GOST 8.207−76 State system for ensuring the uniformity of measurements. Direct measurements with multiple observations. Methods of processing the results of observations. Key issues*
________________
* In the Russian Federation GOST R 8.736−2011 «State system for ensuring the uniformity of measurements. The direct measurement repeated. Methods of processing of measurement results. General provisions».


GOST 12.1.005−88 standards System of labor safety. General hygiene requirements for working zone air

GOST 12.3.002−75 System safety standards. The process of production. General safety requirements

GOST 503−81 cold-rolled strips of low carbon steel. Specifications

GOST 2590−2006 bars, steel, hot rolled round. Assortment

GOST 2603−79 Reagents. Acetone. Specifications

The Wire GOST 3282−74 General purpose low carbon steel. Specifications

GOST 4142−77 Reagents. Calcium nitrate 4-water. Specifications

GOST 7564−97 hire. General rules of sample, blanks collection for mechanical and technological tests

GOST 7565−81 (ISO 377−2-89) Iron, steel and alloys. Sampling method for determination of chemical composition

GOST 7566−94 metal Products. Acceptance, marking, packing, transportation and storage

GOST 10922−2012 Reinforcement and embedded products welded, woven and mechanical joints for reinforced concrete structures. General specifications

GOST 12004−81 Steel reinforcement. Test methods tensile

GOST 12026−76 laboratory filter Paper. Specifications

GOST 12354−81 Steel alloyed and high alloy. Methods for determination of molybdenum

GOST 12359−99 (ISO 4945−77) Steels carbon, alloyed and high alloy. Methods for determination of nitrogen

GOST 12360−82 Steel alloyed and high alloy. Methods of boron determination

GOST 12361−2002 Steel alloyed and high alloy. Methods for determination of niobium

GOST 12365−84 Steel alloyed and high alloy. Methods for determination of zirconium

GOST 14019−2003 (ISO 7438:1985) Materials of metal. Method of bend test

GOST 14098−2014 welded Joints of reinforcement and embedded products for reinforced concrete structures. Types, designs and sizes

GOST 18895−97 Steel. Method of photoelectric spectral analysis

GOST 21014−88 ferrous metals. Terms and definitions of defects

GOST 22536.0−87 carbon Steel and unalloyed cast iron. General requirements for methods of analysis

GOST 22536.1−88 carbon Steel and unalloyed cast iron. Methods for determination of total carbon and graphite

GOST 22536.2−87 carbon Steel and unalloyed cast iron. Methods of determining sulphur

GOST 22536.3−88 carbon Steel and unalloyed cast iron. Methods for determination of phosphorus

GOST 22536.4−88 carbon Steel and unalloyed cast iron. Methods for determination of silicon

GOST 22536.5−87 (ISO 629−82) carbon Steel and unalloyed cast iron. Methods for determination of manganese

GOST 22536.6−88 carbon Steel and unalloyed cast iron. Methods for determination of arsenic

GOST 22536.7−88 carbon Steel and unalloyed cast iron. Methods for determination of chromium

GOST 22536.8−87 carbon Steel and unalloyed cast iron. Methods for determination of copper

GOST 22536.9−88 carbon Steel and unalloyed cast iron. Methods for determination of Nickel

GOST 22536.10−88 carbon Steel and unalloyed cast iron. Methods for determination of aluminium

GOST 22536.11−87 carbon Steel and unalloyed cast iron. Methods for determination of titanium

GOST 22536.12−88 carbon Steel and unalloyed cast iron. Methods for determination of vanadium

GOST 22867−77 Reagents. The ammonium nitrate. Specifications

GOST 23732−2011 Water for concretes and mortars. Specifications

GOST 26007−83 Calculations and strength tests. Methods of mechanical testing of metals. Test methods for stress relaxation

GOST 26877−2008 metal Products. Methods of measuring form deviations of

GOST 27809−95 Cast iron and steel. Methods for spectrographic analysis

GOST 30136−95 (ISO 8457−1-89) carbon steel wire rods of common quality. Specifications

Note — When using this standard appropriate to test the effect of reference standards in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet or in the annual information index «National standards» published as on January 1 of the current year, and the editions of the monthly information index «National standards» for the current year. If the reference standard is replaced (changed), when using this standard should be guided by replacing (amended) standard. If the reference standard is cancelled without replacement, then the situation in which the given link applies to the extent that does not affect this link.

3 Terms and definitions

This standard applies the following terms with respective definitions:

3.1 reinforcement bars periodic profile: rolled bars or coils with evenly placed on its surface at an angle to its longitudinal axis transverse ribs to improve bonding with concrete.

3.2 reinforcement rolled smooth profile: rolled in bars or rolls, the surface of which has a periodic profile.

3.3 grade of reinforcing bars: Established by the standard minimum value of the physical () or conditional (in) yield stress (N/mm).

3.4 nominal diameter , mm Diameter of equal-sized cross-sectional area of round smooth rolled.

3.5 nominal cross-sectional area , mm: cross-sectional Area of rolled periodic profile equal to the cross sectional area of round smooth rolled with the same nominal diameter .

3.6 parameters of the periodic profile of reinforcing bars: (see figures 1−4):

3.6.1 longitudinal rib: a Continuous longitudinal projection formed along the axis of the reinforcing bar.

3.6.2 transverse rib: a Rib located at an angle to the longitudinal axis of the rental.

3.7 geometric parameters of the periodic profile of reinforcing bar:

3.7.1 fin height (mm): Distance from the top point of the transverse (longitudinal) edges to the surface of the body rolled, measured perpendicular to the axis of rolling (see figures 1−4).

3.7.2 step of transverse ribs t, mm: the Distance between the eponymous corresponding points of adjacent ribs, measured along the axis of rolling (see figures 1−4).

3.7.3 the total distance between the ends of the transverse ribs , mm the sum of the distances between the ends of the transverse ribs, measured in the plane perpendicular to the axis of rolling (see figures 1−4).

3.7.4 the angle of inclination of the transverse edges , C: the angle between the axis of the transverse edges and the longitudinal axis of the products (see figures 1−4).

3.7.5 the angle of the side surface of the transverse edges , deg: the angle of the side surface of the transverse rib to the body surface of the products (see figures 1−4).

3.7.6 width of ribs (mm): Size at top of trapezoidal cross-section transverse (longitudinal) edges in its cross section perpendicular to the axis of the ribs (see figures 1−4).

3.7.7 ovality, mm: the Difference between the largest and smallest cross-sectional dimensions of rolled in absolute value (without sign): and  — for profiles of forms 1 °F, 2 °F and 4 °F (figures 1, 2 and 4);  — profile form 3 °F (figure 3).

3.7.8 the relative size of the shear transverse ribs periodic profile : Projected area of transverse ribs on a plane perpendicular to the axis of rolling, is related to the product of the circumference of the nominal diameter for the actual average step for those ribs.

3.8 probable parameter value: Border quantile statistically calculated variance parameter pertaining to material or article, with reliable failure rate of 5% (P=0,95) or 10% (P=0,90) of the values of the parameters above the minimum value of the acceptance or rejection below maximum values, respectively. This quality level refers to the long-term rating level of quality over a long period of time.

3.9 rejection minimum value : the lower the Allowable value of the parameter below which may not be the result of the tests.

3.10 rejection maximum value : the upper Permissible value of the parameter above which may not be the result of the tests.

3.11 long-term control of the quality level: the quality Control of reinforcing bars based on the statistical (probabilistic) assessment of the reliability of the test results for a long time.

3.12 standard set of technical requirements: Options products for applications that are implemented on a large scale as the reached the factory requirements and standardized in this standard.

3.13 an additional set of technical requirements: the Parameters of reinforcing bar that is different from the standard and previously normirovaniya domestic standards or not previously used on a large scale, which are established by agreement between manufacturer and customer.

3.14 carbon equivalent , %: an Indicator of weldability, the set value which ensures the absence of cold cracks during welding, expressed in the form of bringing to the mass fraction of carbon the amount of mass fraction of carbon, manganese, chromium, vanadium, molybdenum, copper and Nickel.

3.15 the nitrogen equivalent , %: Measure of the maximum mass fraction of nitrogen depending on the total mass fraction nitridebased elements: aluminum, titanium, niobium and vanadium.

3.16 the rod: the products delivered in straight lengths.

3.17 a coil: a rolled delivery condition generated in the coils after hot rolling in the stream rolling mill or after subsequent cold processing.

3.18 resistance to corrosion cracking: the Ability of reinforcing bars to withstand for a specified time under the combined action of bending or tensile stresses and corrosive environments.

3.19 endurance under repeated cyclic loads:the Ability of rolled periodic structure to resist fracture under dynamic effects in the cycle pulsating tension, which is determined when the test of endurance.

4 Classification

4.1 Reinforcement bars klassificeret:

4.1.1 For the purpose:

— for reinforcement of precast concrete structures and construction of monolithic reinforced concrete, depending on the level of the yield strength (), N/mm, — grade: A240, A400, A500, A600;

— for reinforcement of pre-stressed reinforced concrete structures depending on the level of the yield strength (), N/mm, — classes: Ап600, A800, A1000.

4.1.2 configuration of a periodic structure — in the form: 1 °F, 2 °F, 3 °F, 4 °F.

4.1.3 the delivery status:

— bars and rods of standard length (MD);

— rod lengths with random (MD1);

— in bars of random length (ND);

— in coils.

4.1.4 the set of technical requirements:

a) with a standard set of technical requirements in accordance with section 5 classes A240, A400, A500, A600, Ап600, A800, A1000;

b) with an additional set of technical requirements in accordance with section 6:

1) weldable by all welding methods -;

2) categories of plasticity:

m — N;

— high (for seismically resistant rental) — E;

3) requirements for resistance to stress corrosion cracking -;

4) requirements of endurance under repetitive cyclic loading.

5) requirements for stress relaxation — R.

4.1.5 According to the geometrical parameters:

— smooth profile — grade A240;

— periodic profile class: A400, A500, A600, Ап600, A800 and A1000 with standard or additional set of technical requirements in any combination.

4.1.6 groups of limit deviations of the mass of 1 m of length of rolled periodic profile — ОМ1 and ОМ2.

4.2 Letters and numbers in the designation of hire means:

And reinforcement bars;

— AP — rebar periodic profile, designed for use in the reinforcement of prestressed concrete structures (for class Ап600);

— the subsequent numbers after the letter (s) A (Up) — set a real standard for the minimum value of the physical () or conditional (in) yield strength (N/mm);

— following the numbers the letters correspond to the conditional designation of additional characteristics of technical requirements.

5 Standard specifications for reinforcement hire

5.1 Assortment

5.1.1 nominal diameter limit deviation for accuracy class B1, ovality is not more than 75% of the sum of limit deviations, the curvature of the class IV rolled smooth profile with a diameter up to 50 mm inclusive and methods of measurements should correspond to GOST 2590. For rental of a diameter not exceeding 10 mm are allowed maximum deviations for accuracy class B4 according to GOST 2590.

5.1.2 nominal diameter, nominal cross-sectional area, weight of 1 m length limit deviation at the weight of 1 m length and methods of production of rolled periodic profile shall be as specified in table 1.


Table 1 — Nominal diameter cross-sectional area and weight of 1 m length and methods of production

Nominal diameter , mm	Nominal area cross cross section , mm	The method of production according to table 3					Weight of 1 m of length of hire
Nomi- tional, kg	Maximum deviation in the supply, per cent for groups
1	Two	3	4	5	ОМ1	ОМ2
4,0	12,6			0,099	±8,0	To 2.0 -8,0
4,5	15,9			0,125
5,0	19,6			0,154
5,5	23,8			0,187
6,0	28,3						0,222
6,5	33,2			0,261
7,0	38,5						0,302
7,5	44,2			0,347
8,0	50,3						0,395
8,5	56,7			0,445	±6,0	A 1.0 -6,0
9,0	63,6						0,499
9,5	70,9			0,556
10,0	78,5						0,617
11,0	95,0						0,746
12,0	113,1						0,888
13,0	132,7					1,042	±5,0	A 1.0 -5,0
14,0	153,9					1,208
15,0	176,7					One thousand three hundred eighty seven
16,0	201,1					1,578
17,0	U.S. $ 227.0					1,782
18,0	254,5					1,998
19,0	283,5					2,226
20,0	314,2			Two thousand four hundred sixty six
22,0	380,1			2,984	±4,0	A 1.0 -4,5
25,0	490,9			3,853
28,0	615,8			4,834
32,0	804,3			6,313
36,0	1017,9			7,990
40,0	1256,6			9,865
Notes 1 the Sign «» means that this method is mastered or technically available for production. 2 For rental obtained by the method 3 table 3 limit deviation ОМ1 for all sizes shall be ±4,0%. 3 rental classes A800 and A1000 are manufactured with nominal diameters from 10 to 40 mm inclusive. 4 nominal weight of 1 m of the length of the rental established on the basis of the nominal diameter at steel density equal to 7.85 g/cm. 5 tolerances for the weight of 1 m length is shown for individual rods (coils). 6 By agreement between manufacturer and customer are permitted other variations in the mass of 1 m of length of hire. 7 Group of extreme deviations by the weight of 1 m of length of rental (ОМ1 or ОМ2) specify in the order. In the absence of instructions in the order group variance selects the manufacturer and specifies in the instrument of quality.

5.1.3 rental classes A240, A400, A500, A600 and Ап600 manufactured in bars and coils.

5.1.4 rental classes A800 and A1000 are made in bars.

5.1.5 Bars in accordance with the order made in length from 6.0 to 18.0 m:

— measuring length (MD);

— measuring with non-standard length (MD1);

— random length (ND) in the range from 6.0 to 12.0 m.

The preferred dimensional length of bars — 6,0; 9,0; 12,0 (11,7, 11,9); 18.0 m, specified in the order. Manufacturer in agreement with the customer it is possible to manufacture bars with different lengths.

When the supply of rods lengths random with (MD1) are allowed rods of random length (but not less than 2 m) not more than 3% of the batch weight.

5.1.6 in the absence of special requirements, the maximum deviations along the length of the rods lengths must not exceed +100 mm, rods, obtained after straightening and the cutting of the coils, — +25 mm.

5.1.7 the Curvature of bars periodic profile should not exceed 6 mm per 1 m length.

5.1.8 rolled in coils manufactured with a nominal diameter of 22.0 mm, inclusive.

5.1.9 rental in skeins must be wound or stacked without entanglement of the turns among themselves. Allowed the offset or overlap of the turns, without impairing their free unwinding with no entanglement.

Skein must consist of one segment. Allowed, except for the skeins, made according to the methods 3 and 4, the presence of coils, consisting of two segments, not more than 10% of the batch weight.

The weight of the skeins should be from 0.5 to 5.0 tons. Allowed in order to coordinate different weight skeins.

Overall dimensions of coils according to agreement between manufacturer and customer.

5.1.9.1 rolled in coils manufactured according to the methods 3 and 4 should have a relative density of winding n is not less than 70%, which is defined as the quotient of the actual mass of a coil to ground in the pipe based on the actual dimensions of the strand by the formula

, (1)

where is the relative density of winding of a coil, %;

 — the actual weight of coil, t;

 — the height of a coil by the maximum size, m;

 — outer diameter of a coil at the maximum size, m;

the inside diameter of a coil at the minimum size, may be taken without a measurement as the size of core detachable coil, which is formed by a coil, m;

 — the density of steel of 7.85 t/m.

The recommended dimensions of a coil, m:

— inner diameter is 0,60−0,85;

— outer diameter of 1.05 to 1.30;

— height — 0,60−0,80.

5.2 Requirements for geometric parameters of the periodic profile

5.2.1 rental depending on the shape and cross section profile, form and position of the transverse ribs can be produced in four forms — 1 °F, 2 °F, 3 °F and 4 °F. General requirements for a controlled geometrical parameters of the periodic structure given in table 2.


Table 2 — General requirements for controlled geometrical parameters of periodic structures forms 1 °F, 2 °F, 3 °F and 4F

Profile parameter (figures 1−4)		Nominal diameter , mm	Form profiles
1 °F (figure 1)	2 °F (figure 2)	3 °F (figure 3), 4 °F (figure 4)
The height of the transverse ribsh, mm		From 4.0 to 10.0 incl.	Not less than 0.05	Not less than 0,070	Not less than 0.05
SV. 10,0 «22,0 cyl.	Not less 0,065
«22,0	Not less than 0,060
The step of transverse ribs t, mm		From 4.0 to 10.0 incl.	From 0.55to 1.00 incl.	From 0.55to 1.00incl.
SV. 10,0 to 22,0 cyl.	From 0.50to 1.00incl.
SV. 22,0	From 0.45to 1.00incl.
The angle of inclination of the transverse edges		From 4.0 to 40.0 incl.	From 35° to 90° incl.	From 35° to 75° incl.
The angle of the side surface of the transverse edges		From 4.0 to 40.0 incl.	Not less than 45°	Not less than 45°
The total distance between the ends of the transverse ribs , mm		From 4.0 to 40.0 incl.	2(figure 1, section a-a or view C)	Not more than 0.25
Ovality, mm, not more	High accuracy (OV1)	From 4.0 to 8.0 incl.	1,0	1,0	For the rolled profile forms 3 °F and 4 °F of the production method 3 in table 3 is 0.1. For rental profile 4 °F, the production methods 1 and 2 in table 3 is the same as the rules for the profile form 2F
SV. Of 8.0 «to 14.0 «	1,2	1,2
«14,0» 25,0 «	1,6	1,6
«25,0	2,4	2,4
Ordinary precision (ОВ2)	From 6.0 to 8.0 incl.	2,2	2,2
SV. Of 8.0 «to 14.0 «	2,5	2,5
«14,0» 25,0 «	3,0	3,0
«25,0	4,2	4,2
The relative size of the shear of the transverse ribs , at least		From 4.0 to 6.0 incl.	0,039 ()
SV. 6,0 «8,0 «	0,045 ()
«8,0» 10,0 «	0,052 ()
«10,0» 40,0 «	0,056 ()
The parameters and are used to build and configure the calibre and profile is not controlled. Notes 1 Accuracy ovality of hire (OV1 or ОВ2) specify in the order. If not specified in the order, accuracy in ovality selects the manufacturer and specifies in the instrument of quality. 2  — the value corresponding to the lower limits of the corresponding parameters listed in tables 2, 5 and 7.

5.2.1.1 rental classes A400, A500, A600, Ап600 produce the shape of the profile 1 °F, 2 °F, 3 °F, 4 °F. Profile settings in accordance with table 2.

5.2.1.2 rental classes A800, A1000 produce a profile form 2 °F. Profile settings in accordance with table 2.

5.2.1.3 allowed by agreement between manufacturer and customer, the production of rolled all classes, with the profile of another shape that does not impair the requirements of the hire set out in this standard.

5.2.1.4 the shape of the profile (1 °F, 2 °F, 3 °F, 4F) specify in the order, in the absence of instructions — it is established by the manufacturer and specifies in the instrument of quality.

5.2.2 the shape of the profile 1 °F (figure 1) corresponds to a periodic profile with two longitudinal and transverse to the axis of the inclined ribs circular cross-section with a uniform thickness of half-rings located on two opposite perimeter sides. The contour of the transverse and longitudinal ribs in the section A-A (figure 1) forms a closed circle or oval (circular profile).

The shape of the profile 1 °F, the generally applied for production methods 1, 2 and 4 in table 3.

Figure 1 — the Configuration and parameters of the periodic profile in the form 1F

Figure 1 — the Configuration and parameters of the periodic profile in the form 1F

5.2.3 profile Form 2 °F (figure 2) corresponds to a periodic profile with two longitudinal edges (or without them) and transverse to the axis of the inclined ribs sickle-shaped cross-section, disposed on two opposite perimeter sides. The contour of the transverse and longitudinal ribs on the section (figure 2) has a variable on the vertical axis, closed line (a Crescent profile).

When you run the profile form 2 °F without longitudinal ribs, the transverse contour of the ribs and beremennyh (smooth) sections in a section must form a closed circle or oval.

The profile form 2 °F, as a rule, applies to production methods 1, 2 and 4 in table 3.

Figure 2 — the Configuration and parameters of the periodic profile in the form 2F

Figure 2 — the Configuration and parameters of the periodic profile in the form 2F

Table 3 — Recommended methods of production and the conditions of sampling and preparation of samples for testing tensile and bending or bending and straightening

Recommended methods of production of rental	The conditions of sampling and preparation of samples for testing tensile and bending or bending and straightening
In the delivery condition (I1)	After artificial aging (I2)
Method 1. Hot rolling smooth and periodic profile without controlled cooling in the flow rolling mill	+	-
Method 2. Hot rolling of periodical profile with a controlled cooling in the flow rolling mill	+	+
Method 3. Cold treatment coils hot rolled smooth round steel bars with the application of a periodic profile	+	+
Method 4. Cold treatment of hot-rolled steel periodic profile	+	+
Method 5. Cold straightening and cutting rolled bars unwinding skeins	+	+
Note — the Sign «-" means that the selection conditions and sample preparation (I2) for a given mode of production is not used, the «+ «sign is used.

5.2.4 the shape of the profile 3 °F (figure 3) corresponds to a regular profile without longitudinal ribs and transverse inclined to the axis of the ribs sickle-shaped cross-section, arranged on three sides uniformly around the perimeter. The outline of the cross ribs and beremennyh (smooth) areas on the section a-A (e, figure 3) forms a closed circle or oval (triangular profile).

The profile form 3 °F, as a rule, applied to the production method 3 in table 3.

5.2.5 the shape of the profile of 4 °F (figure 4) corresponds to a regular profile without longitudinal ribs and transverse inclined to the axis edges of the segment sections which are symmetrical on all four sides for the perimeter. The outline of the cross ribs and beremennyh (smooth) areas on the section a-A (e, figure 4) forms a closed circle or oval (four-sided profile).

Figure 3 — Configuration and the parameters of the periodic profile in the form 3F

Figure 3 — Configuration and the parameters of the periodic profile in the form 3F

Figure 4 — the Configuration and parameters of the periodic profile in the form of 4F

Figure 4 — the Configuration and parameters of the periodic profile in the form of 4F

The shape of the profile of 4 °F, as a rule, applied to the production method 3 in table 3. Allowed to use the profile form 4 °F for production methods 1, 2 and 4.

5.2.6 the shape of the profile of the production method 4 in table 3 is determined by the shape of the profile strip, for method 5, the shape of the profile is rolled into coils.

5.2.7 the Contour of the side surface of the cross-sectional rib profile forms 1 °F, 2 °F, 3 °F and 4 °F should correspond to the form sections b-B in figures 1−4. Profile settings in accordance with table 2.

5.2.8 step edges t to the width of the ledge on the plot of the maximum height of bmust be at least 3 for all forms of profile.

5.2.9 the parameters of the coupling periodic structure forms 1 °F, 2 °F, 3 °F and 4 °F is determined by the magnitude of the relative square of the shear and geometric parameters of the profile: step transverse edges of t, and fin height h, are given in table 2.

Recommended for building caliber dimensions and limit deviations of geometrical parameters of periodic structures forms 1 °F, 2 °F, 3 °F and 4 °F are given in tables A. 1-A. 4 of Annex A.

5.2.10 in accordance With the relative square of the shear of the transverse ribs () of the reinforcing profile requirements of table 2 the presence of deviations in the geometrical parameters of the profile is not a rejection symptom.

5.2.11 Advocating for a closed loop longitudinal fin profile shapes 1 °F are not rejection symptom in the condition of observance of requirements: table 2 — ovality, table A. 1 of Annex A — largest .

5.2.12 the distance between the ends of the transverse ribs e profile form 1 °F take largest .

5.2.13 in the manufacture of profile parameter (see sections b-B of figures 1−4) indicates the need for the fillets along the lines of the pairing of intersecting surfaces, edges, and core rods. This parameter is given to build the calibre and profile is not controlled. When cutting calibers allowed to replace the fillet chamfer.

5.2.14 the Manufacturer guarantees the indicators in table 2 as the minimum likely value, with a security of 95% (P=0,95).

5.3 Methods of production

5.3.1 do Not use as blanks for the manufacture of reinforcing bars of secondhand products or parts, such as: sheet lines, rails etc.

5.3.2 rental can be made in various ways, presented in table 3, providing the required set of standard and additional technical requirements.

The mode of production determines the manufacturer of the hire in accordance with the requirements of technical documentation, duly approved.

At the request of the customer information on the method of production is provided in the document about quality.

5.3.3 allowed for manufacture of rolled products to use other production methods other than shown in table 3.

5.3.4 Recommended methods of production and the conditions of sampling and preparation of samples for testing tensile and bending or bending and straightening for different production methods are shown in table 3.

5.3.5 Selection of test conditions of hire (supplied — 1 or after artificial aging — I2) in accordance with table 3 — according to customer’s requirement stipulated in the order. If you have not specified the order of testing conditions can choose from the manufacturer and specified in the instrument of quality.

If there is disagreement on the results of testing the mechanical properties of rolled products made by production methods 3, 4 and 5 in table 3, in the absence of guidance in the ordering of test conditions, the test is performed after artificial aging (I2).

The mode of artificial aging: heating the test sample to a temperature of (100±10)°C, exposure at this temperature for at least 60 min, cooling in calm air at a temperature of (20)°C. the Method of heating samples, set by the manufacturer.

5.4 Chemical composition

5.4.1 the Chemical composition of steel shall be as given in table 4.


Table 4 — Chemical composition of steel

Class rental	Mass fraction of elements, %, not more
C	Si	Mn	P	S	N	Cu	As
A240	0,22	0,05−0,30	0,65	0,050	0,050	0,012	0,30	0,08
(0,25)	(0,03−0,33)	(0,70)	(0,055)	(0,055)	(0,013)	(0,30)	(0,08)
A400, A500, A600	0,22	0,90	1,60	0,050	0,050	0,012	0,35	-
(0,24)	(0,95)	(1,70)	(0,055)	(0,055)	(0,013)	(0,35)
Ап600, A800, A1000	0,32	2,40	2,30	0,040	0,040	0,012	-	0,08
(0,34)	(2,45)	(2,35)	(0,045)	(0,045)	(0,013)	(0,08)
Notes 1 the Sign «-" means that this element is not standardized and not controlled. 2 Without the parentheses indicated the mass fraction of elements in the steel bucket for the sample, in parentheses — in ready rental. 3 In steel, made a scrapbook process allowed the mass fraction of copper (Cu) not more than 0,40 (0,40)%, while the mass fraction of carbon © should be no more than 0,20 (0,22)%. 4 introduction to the steel at the same time, separately or in any combination of the alloying elements V, Nb, Mo, in the amount up to 0.10% of each element in their total mass fraction of not more than 0.15%, as well as other elements. Mass fraction of elements, in case of their introduction in the steel are entered into the document of quality. 5 is allowed to become AI and Ti of not more than 0.025% of each element. 6 allowed an increase in steel mass fraction N of 0.001% by reducing the mass fraction of P at 0.005%. 7 In rolled steel class A500 containing nitridebased elements, such as AI, Ti, V or Nb, the mass percent of N is not limiting. 8 In steel allowed mass fraction of N more 0,012%, if the mass fraction of N does not exceed the value of equivalent nitrogen (N).

5.5 surface Quality

5.5.1 On the surface of reinforcing bars is not allowed:

— cracks;

sunsets, films and shells, degrade its performance.

Classification of defects — according to GOST 21014.

5.5.2 permitted on the surface rolled in the presence of uniform or local (local) atmospheric rust.

5.5.3 On the surface of bars made by method 5 in table 3, allowed traces the changes from a maximum depth of ¼ the height of the longitudinal protrusions and reducing the height of the transverse projections is not more than 10% of the minimum height of the rib h with the mandatory provision of the spacing parameters t