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GB/T 3278-2023 (GB/T3278-2023)

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GB/T 3278-2023: PDF in English (GBT 3278-2023)

GB/T 3278-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 70.140.50
CCS H 46
Replacing GB/T 3278-2001
Hot-rolled steel plates, sheets and strips for tools
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 7
4 Classification and code ... 7
5 Order content ... 7
6 Size, shape and weight ... 8
7 Technical requirements ... 8
8 Test methods ... 13
9 Inspection rules ... 14
10 Packaging, marking and quality certificate ... 15
Appendix A (Normative) Size, shape and allowable deviation of steel strips with
nominal width less than 600 mm ... 16
Appendix B (Informative) Comparison table between the designations in this document
and domestic and foreign designations ... 18
References ... 19
Hot-rolled steel plates, sheets and strips for tools
1 Scope
This document stipulates the classification and code, order content, size, shape, weight,
technical requirements, test methods, inspection rules, packaging, marking and quality
certificate of hot-rolled steel plates, sheets and strips for tools.
This document applies to hot-rolled steel plates, sheets and strips for tools with a
nominal thickness not greater than 25 mm (hereinafter referred to as steel plates, sheets
and strips).
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 222, Permissible tolerances for chemical composition of steel products
GB/T 223.5, Steel and iron - Determination of acid-soluble silicon and total silicon
content - Reduced molybdosilicate spectrophotometric method
GB/T 223.11, Iron, steel and alloy - Determination of chromium content - Visual
titration or potentiometric titration method
GB/T 223.14, Methods for chemical analysis of iron, steel and alloy - The N-benzoy-
N-phenylhydroxylamine extraction photometric method for the determination of
vanadium content
GB/T 223.19, Methods for chemical analysis of iron, steel and alloy - The
neocuproine-chloroform extraction photometric method for the determination of
copper content
GB/T 223.23, Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.26, Iron, steel and alloy - Determination of molybdenum content - The
thiocyanate spectrophotometric method
GB/T 223.62, Methods for chemical analysis of iron, steel and alloy. The butyl
acetate extraction photometric method for the determination of phosphorus content
GB/T 223.63, Iron, steel and alloy - Determination of manganese content - Sodium
(potassium) periodate spectrophotometric method
GB/T 223.68, Methods for chemical analysis of iron, steel and alloy - The potassium
iodate titration method after combustion in the pipe furnace for the determination of
sulfur content
GB/T 223.69, Iron, steel and alloy - Determination of carbon contents - Gas-
volumetric method after combustion in the pipe furnace
GB/T 224, Determination of depth of decarburization of steels
GB/T 230.1, Metallic materials - Rockwell hardness test - Part 1: Test method
GB/T 231.1, Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 247, General rule of package, mark and certification for steel plates (sheets)
and strips
GB/T 709-2019, Dimension, shape, weight and tolerance for hot-rolled steel strip,
plate and sheet
GB/T 1299-2014, Tool and mould steels
GB/T 4336, Carbon and low-alloy steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (routine method)
GB/T 8170, Rules of rounding off for numerical values & expression and judgment
of limiting values
GB/T 10561-2023, Steel - Determination of content of nonmetallic inclusions -
Micrographic method using standards diagrams
GB/T 13298, Inspection methods of microstructure for metals
GB/T 13302, Steel - Determination of area content of graphite-micrographic method
using diagrams
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
GB/T 20123, Steel and iron - Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 20125, Low-alloy steel. Determination of multi-element contents. Inductively
coupled plasma atomic emission spectrometric method
3 Terms and definitions
No terms and definitions need to be defined in this document.
4 Classification and code
4.1 Steel plates, sheets and strips, by edge state, are classified into:
a) cut edge, EC;
b) mill edge, EM.
4.2 Continuous-rolled steel plates, sheets and strips, by thickness accuracy, are
classified into:
a) ordinary thickness accuracy, PT.A;
b) higher thickness accuracy, PT.B.
4.3 Steel plates, sheets and strips, by surface treatment method, is classified into:
a) rolled surface, SR;
b) acid-pickled surface, SA.
5 Order content
5.1 The order contract or order form includes the following:
a) a reference to this document;
b) product name (steel plate or steel strip);
c) designation;
d) specifications and size, shape and accuracy;
e) delivery state;
f) edge state;
g) surface treatment method;
h) weight;
i) special requirements.
5.2 When it is not specified in the order contract or order form, the following provisions
shall apply:
a) Where the surface treatment method is not indicated, the product shall be supplied
with rolled surface;
b) Single-rolled steel plates delivered with rolled surfaces shall be supplied in the
state of Class A thickness tolerance and cut edge as specified in GB/T 709-2019;
continuous-rolled steel plates, sheets and strips shall be supplied in the state of
ordinary thickness accuracy and mill edge;
c) For steel plates, sheets and strips delivered with acid-pickled surfaces, if the
thickness accuracy and edge state are not specified, they shall be supplied in the
state of higher thickness accuracy and cut edge.
6 Size, shape and weight
6.1 The size, shape and allowable deviation of steel plates, sheets and strips with a
nominal width of not less than 600 mm shall comply with the following requirements:
a) The thickness allowable deviation of single-rolled steel plates shall comply with
the requirements in Table 2 of GB/T 709-2019, and the thickness allowable
deviation of continuous-rolled steel plates, sheets and strips shall comply with the
requirements in Table 4 of GB/T 709-2019;
b) The unevenness of single-rolled steel plates shall comply with the requirements
in Table 10 of GB/T 709-2019, and the unevenness of continuous-rolled steel
plates shall comply with the requirements corresponding to “the specified
minimum yield strength Re is greater than 300 MPa” in Table 11 of GB/T 709-
2019;
c) The allowable deviations in other sizes and shapes of steel plates, sheets and strips
shall comply with the provisions of GB/T 709-2019.
6.2 The size, shape and allowable deviation of steel strips with a nominal width less
than 600 mm shall comply with the provisions of Appendix A. Special requirements
from the buyer, if any, shall be determined through negotiation between the supplier
and the buyer and stated in the contract.
6.3 Steel plates, sheets and strips are delivered according to actual weight.
7 Technical requirements
7.1 Designation and chemical composition
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.