GOST 30136-95
GOST 30136−95 (ISO 8457−1-89) carbon steel wire rods of common quality. Specifications
GOST 30136−95
(ISO 8457−1-89)
Group B22
INTERSTATE STANDARTINE OF CARBON STEEL OF ORDINARY QUALITY
Specifications
Carbon steel wire rods of common quality. Specifications
ISS 77.140.60
OKP 09 0200
Date of introduction 1998−01−01
Preface
1 DEVELOPED by the Technical Committee of Ukraine N 4 «Cast iron, rolled sheet, bars, cigarettes, products for rolling stock, hardware and consumer goods»; the Institute of ferrous metallurgy (HMI)
SUBMITTED to the State Committee of Ukraine for standardization, Metrology and certification
2 ADOPTED by the Interstate Council for standardization, Metrology and certification (Protocol No. 8 dated October 10, 1995)
The adoption voted:
| The name of the state |
The name of the national authority standardization |
| The Republic Of Belarus |
Belstandart |
| The Republic Of Kazakhstan |
Gosstandart Of The Republic Of Kazakhstan |
| The Republic Of Moldova |
Moldovastandart |
| Russian Federation |
Gosstandart Of Russia |
| The Republic Of Tajikistan |
Tajikistandart |
| Turkmenistan |
The main state inspection of Turkmenistan |
| The Republic Of Uzbekistan |
Standards |
| Ukraine |
Gosstandart Of Ukraine |
3 this standard corresponds to international standard ISO 8457−1-89 «steel wire Rod. Part 1. Dimensions and tolerances» of its product mix, the main parameters and dimensions
4 Resolution of the State Committee of the Russian Federation for standardization, Metrology and certification dated may 21, 1997 N 188 interstate standard GOST 30136−94 introduced directly as state standard of the Russian Federation from January 1, 1998
5 INTRODUCED FOR THE FIRST TIME
6 REISSUE
1 SCOPE
This standard applies to wire rod of carbon steel of ordinary quality, is manufactured for wire and other purposes.
2 NORMATIVE REFERENCES
The present standard features references to the following standards:
GOST 166−89 Calipers. Specifications
GOST 380−94 carbon Steel of ordinary quality. Brand
GOST 1497−84 (ISO 6892−84) Metals. Test methods tensile
GOST 2590−88 rolled steel hot rolled round. Assortment
GOST 3118−77 hydrochloric Acid. Specifications
GOST 5639−82 of Steel and alloys. Methods of detection and determination of grain size
GOST 7565−81 (ISO 377−2-89) Iron, steel and alloys. Method of sampling for chemical composition
GOST 7566−94 metal Products. Acceptance, marking, packing, transportation and storage
GOST 8233−56 Steel. The standards of the microstructure
GOST 12359−99 (ISO 4945−77) Steels carbon, alloyed and high alloy. Methods for determination of nitrogen
GOST 14019−80 (ISO 7438−85) Metals. Test methods for bend
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 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 plegadora 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
3 CLASSIFICATION, BASIC PARAMETERS AND DIMENSIONS
3.1 the method of cooling rod can be cooled in air or subjected to one — and two-stage accelerated cooling:
УО1 one — stage cooling;
УО2 — two-stage cooling;
IN air cooling.
3.2 precision rolling wire rod manufactured according to GOST 2590:
B — the increased accuracy;
V — usual accuracy.
3.3 produce wire Rod with a diameter of 5,0; 5,5; 6,0; 6,3; 6,5; 7,0; 8,0 and 9.0 mm. By agreement with the consumer it is allowed manufacture of wire rod with a diameter of more than 9.0 mm in coils.
3.4 Diameters of wire rod, the tolerances for diameter, cross sectional area and the mass per meter length should correspond to GOST 2590.
For a rod diameter up to 9.0 mm inclusive, made in wire mills which are not equipped with blocks finishing stands, the deviation in diameter ±0.5 mm.
3.5 Roundness of wire rod shall not exceed 50% of total limit deviation for diameter.
Example of designation of wire rod is rapidly cooled single-stage method (УО1) with a diameter of 6.0 mm of steel grade Stsk the usual accuracy of rolling (In):
Rod In-6,0-Stsk — УО1 GOST 30136−94
4 GENERAL TECHNICAL REQUIREMENTS
4.1 Characteristics
4.1.1 wire Rod manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.
4.1.2 wire Rod is manufactured from commercial quality carbon steel grades CT0, CT1, CT2, STZ all degrees of deoxidation according to GOST 380.
4.1.3 Chemical composition and maximum deviations in the finished wire rod should correspond to GOST 380.
4.1.3.1 Mass fraction of carbon in the wire rod of steel grade St0 must be not more than 0.20% plavonia analysis.
4.1.3.2 When the deoxidation semi-killed steel aluminum, titanium or other scavengers that do not contain silicon, and several deoxidants (ferrosilicon and aluminum, ferrosilicon and titanium, etc.) mass fraction of silicon is allowed less than 0.05% while providing a normalized set of properties of wire rod.
4.1.3.3 customer’s request wire rods steel grade St0 is supplied with a mass fraction of carbon not more than 0.12%; the conditional designation of such wire rod is added the letter M.
4.1.3.4 customer’s request mass fraction of sulfur and phosphorus in steel at plavonia analysis shall not exceed 0,040% 0,035% respectively.
4.1.4 On the rod surface must not be smoothed out cracks, rolling shells, sunsets, mustache and rolled out of the dirt. Not allowed the prints, rabiza, rolled out the bubbles and risks, some small slivers that shows the sizes of wire rod for limit deviation for diameter.
4.1.5 wire rod is not allowed the remnants of shrinkage.
4.1.6 Mass scale on the surface of the wire rod subjected to single-stage cooling from the rolling heat, must not exceed 18 kg/t, the two-stage — 10 kg/t. the Mass scale for the wire rod cooled in air, is not regulated.
4.1.7 Relative contraction of wire rod from all steel grades and tensile strength of wire rod of steel grade St0 with a mass fraction of carbon up to 0.12% must conform to the standards given in table 1.
Customer’s request wire rod of steel grades St1, ST2 and STZ all degrees of oxidation comes from the normalized temporary resistance, are shown in table 1.
Table 1
| Steel grade |
Tensile strength, |
The relative narrowing of the cross section after rupture | ||
| УО1 IN |
УО2 |
УО1 IN |
УО2 | |
| St0 with a mass fraction of carbon up to 0.12% |
420 (43) |
470 (48) |
68 |
66 |
| St0 with a mass fraction of carbon in excess of 0.12% |
- |
- |
60 |
58 |
| St1kp, St1ps, St1sp |
420 (43) |
470 (48) |
68 |
66 |
| St2kp, St2ps, St2sp |
420 (43) |
470 (48) |
60 |
60 |
| Stsk, Stsps, Stzsp |
490 (50) |
540 (55) |
60 |
60 |
4.1.8 Rod shall withstand cold bending through 180° around mandrel of diameter equal to the diameter of the test rod.
4.1.9 In the microstructure of wire rod, podolka (martensitic and toostonedtocare areas) is not allowed.
4.1.10 produce wire Rod in coils consisting of one continuous cut. Coils wire rod in coils have to be placed without entanglement. It is possible to produce wire rod in coils, consisting of two segments, not more than 10% of the batch weight.
4.1.11 the Weight of one roll should be not less than 160 kg. allowed in the party up to 10% of skeins weighing less than 160 kg, but not less than 100 kg.
Allowed weight of coil not less than 50 kg for wire rod produced on the linear mills.
4.1.12 At the customer’s request wire rod comes with a guarantee weldability. Weldability is ensured by chemical composition and production technology of wire rod.
4.1.13 At the request of the consumer in the wire rod is determined by the grain size of ferrite. Norms are established by agreement between manufacturer and consumer.
4.2 Marking
4.2.1 Marking of wire rod is according to GOST 7566.
4.2.1.1 Coils, consisting of two segments, must have two labels.
4.2.1.2 Each batch is accompanied by a quality document with additional indication of the method of cooling of wire rod.
4.3 Packaging
4.3.1 Packaging of wire rod is according to GOST 7566 with additions.
4.3.1.1 In agreement with the consumer allowed the formation of skeins in bundles weighing no more than 5 tons.
5 ACCEPTANCE RULES
5.1 wire Rod taken for parties consisting of coils wire rod of the same diameter, one melting and one method of cooling.
Acquisition allowed the national team of the party from a rod of the same diameter, same brand several steel heats and one method of cooling. Weight team of the party should be no more than carload norms.
5.2 surface Quality check on each reel rod. To control the diameter and ovality of wire rod selected 5% of the skeins, but at least three of the party.
5.3 control of the mechanical properties, microstructure, mass scale on the surface of wire rod and flexure tests taken three coils from the party. From each controlled roll take one sample for each test from either end of a coil — rod cooled one-stage or on the air, and from its rear end rod, a chilled two-stage method.
Determination of the mass scale, the relative narrowing of the cross section after the rupture, a temporary resistance, as well as the bend test and control of the microstructure of the manufacturer is allowed to produce, provided that these characteristics of the production technology.
If unsatisfactory results at least in one of the figures on it, repeat tests are carried out at twice the sample. The results of repeated tests spread to the entire party.
5.4 Sampling for the determination of chemical composition is carried out according to GOST 7565. Determination of the chemical composition in the finished wire rod is allowed not to perform if the manufacturer guarantees compliance with the established standards.
6 METHODS TO CONTROL
6.1 Chemical analysis were carried out according to GOST 22536.0 to GOST 22536.9, GOST 12359 or other methods providing the required accuracy of the analysis.
6.2 measurement of the rod diameter and sampling for all types of tests carried out at a minimum distance of 1.5 m from the end of the strand for coils weighing up to 250 kg and not less than 3.0 m for coils weighing over 250 kg.
To determine the mass of dross on the surface of wire rod, select a sample length of 500 mm.
6.3 surface quality Control is carried out visually without the use of magnifying devices. The depth of the defects on the surface of the rod is determined after zapilovke needle files to remove the defect with subsequent comparative measurement of the neighbouring land — stripped and unstripped.
If necessary, permission to carry out a quality control surface with the aid of magnifying devices.
6.4 the Diameter of wire rod, measured to the nearest 0.1 mm with a caliper type SHC-1, MCT-1 according to GOST 166.
6.5 the Mass of the oxides on the rod surface is determined by the method given in Appendix A.
6.6 Temporary resistance and relative narrow cross-section after rupture is determined according to GOST 1497.
6.7 the bend Test in cold state is carried out according to GOST 14019.
6.8 Control of the microstructure is carried out according to GOST 8233.
6.9 the grain Size of ferrite is determined according to GOST 5639.
6.10 permitted to use statistical and non-destructive control methods, mechanical properties and other specified characteristics of the rod.
7 TRANSPORTATION AND STORAGE
7.1 Transportation and storage — by GOST 7566 with additions.
Shipments of wire rod produced by the parties. In the same car should be transporting wire rod, one or more batches of a certain diameter and one grade of steel.
Annex a (mandatory). METHODOLOGY FOR RAPID DETERMINATION OF THE AMOUNT OF SCALE ON THE WIRE ROD SUBJECTED TO ONE — AND TWO-STAGE REGULATED COOLING
APPENDIX A
(required)
A. 1 the essence of the method
The technique is based on scale removal by dissolving it in etching solution with the protection of the base metal inhibitors.
A. 2 Equipment, reagents, solutions
Analytical scale.
Hydrochloric acid according to GOST 3118, a solution with a mass concentration of 0.15 g/cm.
Inhibitor of TDA (tolylenediamine).
Note — allowed the use of other inhibitors that slow the acid corrosion of the metal.
A. 3 analysis of
Hydrochloric acid is poured into a tall glass Cup with a capacity of 500 cm, is heated to a temperature of not higher than 50 °C and add inhibitor TDA at the rate of 0.5 g/DM
. To the heated solution is placed 3−5 pieces (simultaneously) rod samples with a length of 90−100 mm, pre-weighed together. When weighing samples before etching take into account the scale separated during cutting.
In the process of descaling are monitoring the etching of each sample, the quality of the sample surface after removing the scale is determined visually.
Treated with the sample removed from the solution, washed, remove excess moisture with filter paper, dried in a stream of warm air, cooled and weighed. The results of weighing the samples in grams is recorded with accuracy to the third decimal place.
A. 4 processing of the results
The average weight of oxides in controlled samples , kg/t, calculated by the formula
where is the initial weight of samples, g;
— the mass of the samples after etching,
The estimated mass of slag on the surface of wire rod kg/ton, calculated by the formula
where — coefficient taking into account the uneven distribution of scale along the length of the coil;
=1.0 for wire rod subjected to two-stage cooling;
=2.5 for rod subjected to single-stage cooling.
The result of the calculation of the mass scale is rounded up to the whole (0,5 rounded up).
The text of the document is verified by:
the official publication of the
Rolled steel General purpose: the security Council. Standards. -
M.: IPK Publishing house of standards, 2003
