GB/T 3278-2023 English PDF (GBT3278-2023)

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GB/T 3278-2023: Hot-rolled steel plates, sheets and strips for tools
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 and 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 709-201...