GB/T 3078-2019 PDF English
US$135.00 · In stock · Download in 9 secondsGB/T 3078-2019: Quality structural steel cold drawn bars Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 3078: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3078-2019 | English | 135 |
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Quality structural steel cold drawn bars
| Valid |
| GB/T 3078-2008 | English | 85 |
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Quality structural steel cold drawn bars
| Obsolete |
| GB/T 3078-1994 | English | 359 |
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Technical requirements for quality structural steel cold drawn bars
| Obsolete |
| GB 3078-1982 | English | 319 |
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Technical requirements for cold drawn quality structure steel bars
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 3078-2019
GB/T 3078-2019: Quality structural steel cold drawn bars---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3078-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing GB/T 3078-2008
Quality structural steel cold drawn bars
Issued on. AUGUST 30, 2019
Implemented on. JULY 01, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Classification... 6
5 Order content... 6
6 Size, shape and allowable deviation... 7
7 Technical requirements... 7
8 Test method... 12
9 Inspection rules... 14
10 Packaging, marking and quality certificate... 15
1 Scope
This Standard specifies the classification, ordering content, size, shape and
allowable deviation, technical requirements, test methods, inspection rules,
packaging, marking and quality certificates of structural steel cold drawing and
cold drawing polish steels.
This Standard applies to quality carbon structural steel and alloy structural steel
cold drawing bars (round steel, square steel and hexagonal steel) and cold
drawing polish round steel (hereinafter collectively referred to as "steel").
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 222, Permissible tolerances for chemical composition of steel products
GB/T 224, Determination of depth of decarburization of steels
GB/T 225, Steel - Hardenability test by end quenching (Jominy test)
GB/T 226, Test method for macrostructure and defect of steel by etching
GB/T 228.1, Metallic materials. Tensile testing. Part 1.Method of test at room
temperature
GB/T 229, Metallic materials. Charpy pendulum impact test method
GB/T 231.1, Metallic materials. Brinell hardness test. Part 1.Test method
GB/T 341-2008, Steel wire - Classification and terminology
GB/T 699, Quality carbon structural steels
GB/T 905-1994, Dimension, shape, weight and tolerance for cold-drawn
round, square and hexagonal steels
GB/T 1814, Inspection method for steel work fractures
GB/T 1979, STANDARD diagrams for macrostructure and defect of structural
steels
3 Terms and definitions
Terms and definitions determined by GB/T 341-2008 and GB/T 3207-2008 are
applicable to this document. For ease of use, some of the terms and definitions
in GB/T 341-2008 and GB/T 3207-2008 are repeated below.
3.1 Cold drawing
A process in which it is formed by pressure processing methods such as die
drawing or roll drawing at normal temperature.
3.2 Polish steel
Polished round steel after drawing or peeling.
4 Classification
Steels, according to the use and processing purposes, are divided into.
5 Order content
Contracts which are ordered under this Standard shall include the following
contents.
a) number of this Standard;
b) product name;
c) designation or unified digital code of the steel;
d) delivery weight (or quantity);
e) size, shape and allowable deviation (see Chapter 6);
f) use and processing purposes (when it is not specified, perform according
to steel for cutting);
g) delivery state (see 7.3.1);
6 Size, shape and allowable deviation
6.1 The size, shape and allowable deviation of cold drawing steel bars shall
comply with the provisions of GB/T 905-1994.The specific requirements shall
be indicated in the contract.
6.2 The size, shape and allowable deviation of cold drawing polish round steel
shall comply with the provisions of GB/T 3207-2008.The specific requirements
shall be indicated in the contract.
7 Technical requirements
7.1 Designation and chemical composition
7.1.1 For the steel designation and chemical composition, quality carbon
structural steel shall comply with the provisions of GB/T 699, alloy structural
steel shall comply with the provisions of GB/T 3077.According to the
requirements of the buyer, it can be ordered according to other designations if
it is specified in the contract.
7.1.2 The allowable deviation of chemical composition of the finished steel
product shall comply with the provisions of GB/T 222.
7.2 Smelting method
Unless otherwise specified in the contract, the smelting method is chosen by
the supplier.
7.3 Delivery state
7.3.1 The delivery state of steels is shown in Table 1.The specific delivery state
shall be indicated in the contract. If it is not specified, deliver in cold drawing state.
7.4 Hardness
7.4.1 The delivery hardness value of steels (except for normalizing state) shall
comply with the requirements of Table 2.According to the requirements of the
buyer, the hardness value of the alloy structural steel that is delivered under
heat treatment after cold drawing (except for normalizing state) without
designation in Table 2 shall comply with the provisions of GB/T 3077; the
hardness of the steel that is delivered under cold drawing and cold drawing
polish state shall not be greater than 285 HBW.
7.4.2 For the steel for hot-press processing that is delivered in the cold drawing
state, the Brinell hardness values of 50Mn2, 35CrMnSi, 42CrMo and 35CrMoV
steels shall comply with the requirements of Table 2;
7.4.3 For steels whose cross-section nominal size (diameter, thickness or
diagonal length) is less than 5 mm, do not perform the hardness test. If it is
required by the buyer and stated in the contract, the tensile strength can be
used instead of the hardness. The specific requirements are determined by the
supplier and the buyer.
7.5 Mechanical property
If it is required by the buyer and stated in the contract, it's available to test the
mechanical properties of the steel in the delivery state; its mechanical
properties shall meet the requirements of Table 3.The mechanical properties
of the steel in the delivery state, whose designation is not listed in Table 3, are
determined by negotiation between the supplier and the buyer.
7.6 Forging
The steel for forging shall be subjected to a forging test; it shall be indicated in
the contract whether it’s cold or hot forging. For cold forging test, forge to one-
half of the original height of the sample; for hot forging test, forge to one-third
of the original height of the sample. The surface of the sample after forging shall
not have visible cracks.
7.7 Macrostructure
7.7.1 The macrostructure of quality carbon structural steel shall comply with the
provisions of GB/T 699.
7.7.2 The macrostructure of alloy structural steel shall comply with the
provisions of GB/T 3077.
7.8 Decarburization layer
According to the requirements of the buyer, the steel whose carbon content is
not less than 0.30% can be decarburized, and the one-side total
decarburization layer (ferrite + transition layer) depth shall meet the
requirements of Table 4.
7.9 Surface quality
7.9.1 The surface of the steel shall be clean, smooth, free of cracks, folds,
crusting, inclusions, cracks and scale cinders; the surface of the heat-treated
cold drawing steel is allowed to have an oxidized color.
7.9.2 For steels for cutting, the surface is allowed to have pitting, scratches,
drawing stamps, black spots, concave surfaces, cleaning slopes and lubricant
marks, whose depth does not exceed the nominal size tolerance from the
nominal size, and some individual hairlines whose depth is half the tolerance.
7.10 Special requirements.
According to the requirements of the buyer, if it is negotiated between the
supplier and the buyer, and specified in the contract, steels of the following
special requirements can be supplied.
a) reduce the chemical composition range;
b) impact absorption energy of the steel in the delivery state;
c) specify upper and lower limits of mechanical properties;
d) inspect the layered fracture;
e) inspect the banded structure;
f) inspect the grain size;
8 Test method
The inspection items and test methods of each batch of steels shall comply with
the requirements of Table 6.
9 Inspection rules
9.1 Inspection and acceptance
9.1.1 The delivery inspection and acceptance of steels shall be carried out by
the supplier's quality and technical supervision department.
9.2 Batch rules
the steels shall be inspected and accepted in batches. Each batch shall consist
of steels of the same designation, the same heat number, the same processing
method, the same size, the same delivery state, and the same heat treatment
system (heating).
9.3 Sampling quantity and sampling portion
The sampling quantity and sampling portion of the steels shall comply with the
requirements of Table 6.
9.4 Re-inspection and determination rules
9.4.1 The re-inspection and determination rules of the steels shall comply with
the provisions of GB/T 17505.
9.4.2 If the supplier can ensure that the steel is qualified, for the test results of
the mechanical properties, macrostructure and non-metallic inclusions of steels
or steel billet of the same heat number, it is allowed to replace the steel with
billet, and replace the small one with the large one.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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