Round bar GOST 14955-77

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  ГОСТ 14955-77

GOST 14955−77 quality round Steel with special surface finish. Specifications (with Amendments No. 1, 2)

Round bar GOST 14955−77
Group В32

INTERSTATE STANDARD

QUALITY ROUND STEEL WITH SPECIAL SURFACE FINISH

Specifications

Quality round steel with special surface finishing. Specifications

GST 11 5000

Date of introduction 1979−01−01

INFORMATION DATA

1. DEVELOPED by all-Union scientific research Institute of ferrous metallurgy them. I. P. Bardin (TSNIICHM)

INTRODUCED by the Ministry of ferrous metallurgy of the USSR

2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 02.09.77 N 2133

3. REPLACE GOST 14955−69

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	Item number
GOST 9.014−78	6.2
GOST 166−89	5.2
GOST 1050−88	3.4
GOST 1414−75	3.4
GOST 1435−99	3.4
GOST 1763−68	5.5
GOST 2216−84	5.2
GOST 2789−73	3.2, 5.4
GOST 2991−85	6.2
GOST 3282−74	6.2
GOST 3560−73	6.2
GOST 4543−71	3.4
GOST 5949−75	3.4
GOST 5950−2000	3.4
GOST 6009−74	6.2
GOST 6507−90	5.2
GOST 7502−98	5.2
GOST 7566−94	4.1, 4.6
GOST 8828−89	6.2
GOST 9569−79	6.2
GOST 10198−91	6.2
GOST 10396−84	6.2
GOST 14082−78	3.4
GOST 14253−78*	6.2
_______________ * Probably a mistake of the original. Should read GOST 14253−76. — Note the manufacturer’s database.
GOST 15102−75	6.2
GOST 15846−79	6.5
GOST 18477−79	6.2
GOST 19265−73	3.4
GOST 20259−80	6.2
GOST 20779−88	6.2
GOST 21650−76	6.2
GOST 24597−81	6.2
GOST 24643−81	5.3

5. Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)

6. EDITION with Amendments No. 1, 2 approved in September 1985, March 1988 (IUS 12−85, 6−88)


This standard applies to high-quality round steel with a diameter of 0.20 to 50 mm with special surface finish. The special surface finish is obtained by removing the surface layer.

1. CLASSIFICATION

1.1. Steel classification:

— quality of surface finishing in group A, B, C, G, D, E;

— precision manufacturing on qualitity h5, h6, h7, h8, h9, h10, h11, h12;

— referring to materials at:

bars,

coils;

— as material:

heat-treated — T,

nagaremono — N.

(Changed edition, Rev. N 2).

2. ASSORTMENT

2.1. The diameter of the steel and maximum deviations in diameter given in table.1.

Table 1

In millimeters

Diameter of steel	Pred. off. the diameter of the steel qualitativ
	h5	h6	h7	h8	h9	h10	h11	h12
0,20; 0,25; 0,30	-	-0,005	-0,010	-0,014	-0,025	-	-	-
0,35; 0,40; 0,45; 0,50; 0,55; 0,60; 0,65; 0,70; 0,75; 0,80; 0,85; 0,90; 0,95		-0,006
1,00; 1,05; 1,10; 1,15; 1,20; 1,25; 1,30; 1,35; 1,40; 1,45;						-0,040	-0,060
1,50; 1,55; 1,60; 1,65; 1,70; 1,75; 1,80; 1,85; 1,90; 1,95; 2,00; 2,05; 2,10; 2,15; 2,20; 2,25; 2,30; 2,35; 2,40; 2,45; 2,50; 2,55; 2,60; 2,65; 2,70; 2,75; 2,80; 2,85; 2,90; 2,95; 3,00	-	-0,006	-0,010	-0,014
3,10; 3,20; 3,30; 3,40; 3,50; 3,60; 3,70; 3,80; 3,90; 4,00; 4,10; 4,20; 4,30; 4,40; 4,50; 4,60; 4,70; 4,80; 4,90; 5,00; 5,10; 5,20; 5,30; 5,40; 5,50; 5,60; 5,70; 5,80; 5,90; 6,00	-0,005	-0,008	-0,012	-0,018	-0,030	-0,048	-0,075	-0,120
6,10; 6,20; 6,30; 6,40; 6,50; 6,60; 6,70; 6,80; 6,90; 7,00; 7,10; 7,20; 7,30; 7,40; 7,50; 7,60; 7,70; 7,80; 7,90; 8,00; 8,10; 8,20; 8,30; 8,40; 8,50; 8,60; 8,70; 8,80; 8,90; 9,00; 9,10; 9,20; 9,30; 9,40; 9,50; 9,60; 9,70; 9,80; 9,90; 10,00	-	-	-0,015	-0,022	-0,036	-0,058	-0,090	-0,150
10,25; 10,50; 10,75; 11,00; 11,25; 11,50; 11,75; 12,00; 12,25; 12,50; 12,75; 13,00; 13,25; 13,50; 13,75; 14,00; 14,50; 15,00; 15,50; 16,00; 16,50; 17,00; 18,00			-	-0,027	-0,043	-0,070	-0,110	-0,180
18,50; 19,00; 19,50; 20,00; 21,00; 22,00; 23,00; 24,00; 25,00; 26,00; 27,00; 28,00; 29,00; 30,00				-0,033	-0,052	-0,084	-0,130	-0,210
31,00; 32,00; 33,00; 34,00; 35,00; 36,00; 37,00; 38,00; 39,00; 40,00; 41,00; 42,00; 43,00; 44,00; 45,00; 46,00; 47,00; 48,00; 49,00; 50,00				-	-0,062	-0,100	-0,160	-0,250

Notes:

1. On demand of the consumer is allowed to produce steel of intermediate diameters with maximum variance nearest the smaller diameter.

2. Steel qualitativ h5, h6, h7 and h8 are made by agreement between manufacturer and consumer.

2.2. The ovality of steel (the difference between the largest and smallest diameters) of the same section should not exceed half of the maximum deviations in diameter.

Note. By agreement with the consumer it is allowed manufacture of steel class h12 and h11 groups of the surface G and D with ovality not exceeding the limit deviation for diameter.

2.1, 2.2. (Changed edition, Rev. N 2).

2.3. At the request of the user is cut cross section (deviation from the profile of the circle) of steel with a diameter of 2 mm incl. should not exceed half of the maximum deviations in diameter, and for diameters St. 2 — mm limit deviation for diameter.

2.4. Produce steel in bars or coils. Recommended sizes and types of products depending on the finish given in the Appendix.

2.5. Bars are made the following length:

— random:

of 0.7 to 1.0 m	-	when	diameter	from 0.2 to 0.6 mm	incl.;
from 1.0 to 1.5 m		«	«	St. 0.6 to 2.0 mm	«
from 1.5 to 2.0 m		«	«	«2.0 to 3.0 mm	«
from 1.9 to 3.5 m		«	«	«3.0 to 9.0 mm	«
from 1.9 to 4.0 m		«	«	«9.0 mm;

— dimensional or multiple-dimensional (within off-gage) extreme deviations in length +50 mm.

Notes:

1. Allowed to produce bars with a length of at least 0.7 m, in diameter from 0.6 to 3.0 mm and not less than 1.0 m in diameter over 3.0 mm. shortened the Number of bars should not exceed 5% of the mass of the party.

2. By agreement between manufacturer and consumer of steel with a diameter of 10 mm or more manufactures in bars up to 6 m incl.

2.6. Bars must be straight. The local curvature of bars with diameter up to 30 mm incl. should not exceed 1 m length of 0.5 mm and bars with diameter over 30 mm for groups:

G — 0.8 mm;

D — 1.0 mm.

2.7. The ends of the rods should be cut straight, without bending and deburring. At customer’s request bars with a diameter of 12 mm and more are manufactured with a chamfer on one end.

Examples of symbols

Steel with a diameter of 5 mm, in bars, groups, In, quality, h9, annealed, grade 20S:

Rod 5-h9-T-20H round bar GOST 14955−77

The same, in skeins, nagarebana:

Skein 5-B-h9-H-20X round bar GOST 14955−77

Steel with a diameter of 10 mm, rods, group B, kvalitet h8, heat-treated, grade U8:

Rod 10-B-h8-T-U8 GOST 14955−77

(Changed edition, Rev. N 2).

3. TECHNICAL REQUIREMENTS

3.1. Steel manufactures cold-worked or heat-treated.

3.2. Depending on qualityof of surface roughness and depth of allowable defects group set finish steel in accordance with table.2.

The surface quality of steel should be achieved by any method of removal of the surface layer (grinding, turning, roughing with subsequent polishing, running, etc.).

3.3. Decarburization of steel is not allowed.

Note. Heat-treated steel after the final surface finish can have a partial decarburization. Rules established by agreement between manufacturer and user.

Table 2

Group surface finish steel	Kvalitet	Surface roughness according to GOST 2789		Name of permissible surface defects	The maximum depth of allowable defects
		ParameterRa, µm, not more	Base length, mm
And	h5, h6, h7, h8, h9, h10	0,32	0,25	Not allowed	Not allowed
B	h6, h7, h8, h9, h10, h11	0,63	0,8
In	h7, h8, h9, h10, h11	1,25
G	h8, h9, h10, h11	2,5		Individual defects mechanical origin	½ limit deviation for diameter
D	h9, h10, h11, h12	-	-		Limit deviation diameter
E	h8, h9			Longitudinal risk	½ limit deviation for diameter

Notes:

1. Group E — remote with pre-drawn surface layer.

2. On the steel surface allowed visible signs of preceding treatment, provided that the surface finish standards of roughness.

3. By agreement with the consumer allowed to produce steel group And quality h11.


(Changed edition, Rev. N 2).

3.4. Steel chemical composition, hardness, macrostructure or kink and finish must meet the requirements of GOST 1050, GOST 1414, GOST 1435, GOST 4543, GOST 5949, 5950 GOST, GOST 14082, GOST 19265.

Steel is manufactured from one or more normalized characteristics (mechanical properties, hardness, test on a hot cake, microstructure, corrosion resistance) for the above standards.

4. ACCEPTANCE RULES

4.1. Rules of acceptance GOST 7566.

4.2. Steel take parties. The party must consist of rods or coils of the same size, one group of surface finish, the same steel grade, the same material condition and requirement of the consumer — and one bathing suit.

4.3. To check the quality of steel from the party taken to determine the depth of decarburization of not less than two bars or coils from the party; to determine surface roughness and faceting of the cross sections of five bars or coils.

4.4. Control the size and appearance of the surface subjected to all the rods and coils.

4.5. The surface roughness of the group G, the manufacturer checks periodically. The frequency control is set by the manufacturer.

4.6. If unsatisfactory test results of at least one of the indicators, repeat tests carried out according to GOST 7566.

5. TEST METHODS

5.1. The diameter, shape and surface roughness of the steel is measured at a distance of not less than 25 mm from the end of the bar or coil.

5.2. The diameter of the rods is measured with a micrometer according to GOST 6507, caliper according to GOST 2216, a caliper according to GOST 166, measuring tape according to GOST 7502, the curvature of the probe according to normative-technical documentation (NTD).

(Changed edition, Rev. N 2).

5.3. Cut check with a micrometer with prismatic heel GOST 24643 or by the method agreed between the manufacturer and the customer.

5.4. Surface roughness check the profilers, profiling, optical devices or work samples in accordance with the requirements of GOST 2789.

5.5. Depth bezoperatsionnogo layer of steel with a carbon content of more than 0,3% determined according to GOST 1763 on two samples taken from two different bars or coils of the party.

5.6. Roughness and cutting test on five samples taken from different bars or coils of the party.

5.7. The scope and methods of the control of the properties described in paragraph 3.4, shall meet the requirements of the standards for the corresponding grade.

6. PACKING, MARKING, TRANSPORTATION AND STORAGE

6.1. Packing, marking, transportation and storage — by GOST 7566 with the following additions.

6.2. Steel with special surface finish should be covered with anticorrosive grease (industrial oils 45, 20,-20A and 40A according to GOST 20799 and other conservation lubricants or a mixture thereof in accordance with GOST 9.014 or another NTD; and allowed the coating lubricants of a different composition that provides protection of metal against corrosion) wrapped in one or more layers of waterproof paper (according to GOST 8828,10396 GOST and GOST 9569* or NTD) or antirust paper according to GOST 16295 and Packed in wooden boxes of types I, II, III according to GOST 2991, types III, IV, V GOST 10198 or another NTD, or holstoproshivny cloth GOST of 14,253**, bonded fabric, stitched flap from the textile industry waste packaging materials or other types of NTD, except for cotton and linen fabrics.
______________
* On the territory of the Russian Federation GOST 9569−2006;
** On the territory of the Russian Federation GOST 14253−83. — Note the manufacturer’s database.

Overall dimensions of the boxes shall not exceed 400х500х6000 mm.

Packed in bundles must be tied with wire (GOST 3282, or another NTD) or tape (GOST 3560, GOST 6009 or another NTD).

Products from corrosion-resistant steel protective grease is permitted not to cover.

Bars with a diameter less than 3.0 mm shall be Packed only in boxes when shipping in containers (15102 GOST, GOST 18477 and GOST 20259) bars in boxes you pack.

6.3. When you ship two or more packages to one user should enlarge the cargo space in accordance with the requirements of GOST 24597, GOST 21650.

6.4. Weight of cargo space with mechanized loading and unloading shall not exceed 5 tons.

When manually loading and unloading the weight of the package (package) must not exceed 80 kg.

6.5. The packaging of products sent to the far North and remote areas, is carried out according to GOST 15846*.
_______________
* On the territory of the Russian Federation GOST 15846−2002. — Note the manufacturer’s database.

6.6. The rods are transported by vehicles of all types in accordance with cargo carriage regulations applicable to transport of this type, and conditions of loading and fastening of cargoes, approved by the Ministry of transport.

6.7. Bars should be stored in a dry place, in the air without aggressive ingredients.

Section 6. (Changed edition, Rev. N 1).

APPLICATION (reference). Recommended sizes and types of products depending on the finish

APP
Reference

Group surface finish steel	Diameter, mm	Product
A, B, C	From 0.6 to 5.0 incl.	Bars
	SV. 5.0 to 20 incl.	Bars, coils
G	2.0−5.0 incl.	Bars
	From 20 to 50 incl.
	SV. 5.0 to 20 incl.	Bars, coils
D	From 5.0 to 20.0 incl.	Bars, coils
	SV. 20 to 50 incl.	Bars
E	From 0.2 to 0.4 incl.	Bars
	From 0.4 to 0.6 incl.	Bars and rods, coils, coils
	SV. 0.6 to 0.95 incl.	Coils, coil