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GB/T 33974-2017 (GB/T33974-2017)

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GB/T 33974-2017English115 Add to Cart 0--10 minutes. Auto-delivery. Hot rolling checker steel sheet and strip GB/T 33974-2017 Valid GB/T 33974-2017


GB/T 33974-2017: PDF in English (GBT 33974-2017)
GB/T 33974-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Hot rolling checker steel sheet and strip
ISSUED ON. JULY 12, 2017
IMPLEMENTED ON. APRIL 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Classification and code ... 5 
4 Order contents ... 5 
5 Dimension, shape, weight ... 6 
6 Technical requirements ... 10 
7 Test methods ... 11 
8 Inspection rules ... 11 
9 Packaging, marking and quality certificates ... 12 
Appendix A (Informative) Theoretical weighing method for hot rolling checker
steel sheet ... 13 
Hot rolling checker steel sheet and strip
1 Scope
This standard specifies the classification and code number, order content,
dimensions, shape, weight, technical requirements, test methods, inspection
rules, packaging, markings and quality certificates for hot rolling checker steel
sheet and strip.
This standard applies to diamond-shaped, lentil-shaped, round bean-shaped
and combination-shaped hot rolling checker steel sheet and strip (hereinafter
referred to as steel sheet and strips) having a thickness of 1.4 mm ~ 16.0 mm.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test at
room temperature
GB/T 232 Metallic materials - Bend test
GB/T 247 General rule of package mark and certification for steel sheets
(sheets) and strips
GB/T 700 Carbon structural steels
GB/T 709 Dimensions, shape, weight and tolerances for hot rolled steel
sheets and strips
GB/T 712 Structural steel for ship and marine engineering
GB/T 1591 High strength low alloy structural steels
GB/T 2975 Steel and steel products - Location and preparation of test pieces
for mechanical testing
GB/T 4171 Atmospheric corrosion resisting structural steel
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
GB/T 17505 Steel and steel products General technical delivery
requirements
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
3 Classification and code
3.1 Classification by edge status is as follows.
a) Trimming, EC;
b) Not trimming, EM.
3.2 Classification by shape of the pattern is as follows.
a) Diamond, LX;
b) Lentil-shape, BD;
c) Round bean shape, YD;
d) Combined shape, ZH.
4 Order contents
4.1 Contracts or orders placed under this standard shall include the following.
a) This standard number;
b) Grade;
c) Product category (steel sheet or strip);
d) Specifications;
e) Pattern shape;
f) Edge status;
g) Other requirements.
4.2 Marking example
The untrimmed lentil-shaped pattern steel sheet which is delivered in
Table 3 -- Steel sheet flatness, in millimeters
Thickness Flatness, not more than Measured length
1.4 ~ 2.5 15 1000
> 2.5 ~ 4.0 12
> 4.0 ~ 16.0 10
5.5 Other sizes and shapes of steel sheets and strips are to comply with the
requirements of GB/T 709.
5.6 Steel sheets and strips are delivered by actual weight. In accordance with
the requirements of the purchaser, the steel sheet can refer to Appendix A and
be delivered by theoretical weight.
6 Technical requirements
6.1 Grades and chemical composition
6.1.1 The steel grade and chemical composition (smelting analysis) shall
comply with the provisions of GB/T 700, GB/T 712, GB/T 1591, and GB/T 4171.
With the agreement of the supplier and purchaser, it can supply other grades of
steel sheets and strips.
6.1.2 The allowable deviation of the chemical composition of finished steel
sheets and strips shall comply with the provisions of GB/T 222.
6.2 Delivery status
6.2.1 Steel sheets and strips are delivered in hot rolling condition.
6.2.2 Steel sheets and strips are usually supplied in an untrimmed state, or
otherwise supplied in a trimmed state as specified by the purchaser and
specified in the contract.
6.3 Mechanical properties
According to the requirements of the purchaser, and specified in the contract,
tensile and bending tests can be performed. The performance indicators shall
meet the requirements of GB/T 700, GB/T 712, GB/T 1591, and GB/T 4171 or
the agreement between the both parties.
6.4 Surface quality
6.4.1 The surface of steel sheets and strips shall be free of bubbles, scars,
cracks, folds, and inclusions. There shall be no delamination of steel sheets
and strips.
6.4.2 The surface of steel sheets and strips is allowed to have a thin layer of
......
 
(Above excerpt was released on 2018-06-02, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT33974-2017