GB/T 11251-2025 Alloy structural steel plate, sheet and strip
1 Scope
This document specifies the ordering information, manufacturing processes, technical requirements, test methods, inspection rules, as well as packaging, marking, and quality certificate for alloy structural steel plates, sheets and strips.
This document is applicable to single hot-rolled steel plates and sheets (hereinafter referred to as single-rolled plates and sheets) with a nominal thickness of 3.0mm to 250mm; and continuously hot-rolled plates, sheets and strips with a nominal thickness of not greater than 25.4mm, including continuously hot-rolled wide strips, sheared plates and sheets and slit wide strips with a nominal width of not less than 600mm, and continuously hot-rolled narrow strips and sheared plates and sheets with a nominal width of less than 600mm (hereinafter referred to as steel plates, sheets and strips).
Note: Single-rolled plates and sheets, as well as steel plates, sheets and strips are collectively referred to as steel products in this document.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (All Parts) Methods for chemical analysis of iron, steel and alloy
GB/T 224 Determination of the depth of decarburization of steels
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 232 Metallic materials - Bend test
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 2970-2016 Method for ultrasonic testing of thicker steel plates
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 3077 Alloy structure 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 Determination of content of nonmetallic inclusions in steel - Micrographic method using standard diagrams
GB/T 11261 Steel and iron - Determination of oxygen content - The pulse heating inert gas fusion-infra-red absorption method
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 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas (routine method)
GB/T 34474. 1-2017 Determination of banded structure of steel - Part 1: Micrographic method using standards diagrams
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 709-2019 apply.
4 Ordering information
The ordering contracts or orders made in accordance with this document shall cover the following information:
a) No. of this document;
b) product name;
c) designation;
d) dimension, shape and tolerance or thickness precision;
e) delivery weight (or quantity);
f) delivery condition;
g) edge condition;
h) surface treatment method and surface quality grade;
i) intended application (if for stamping, it shall be indicated);
j) special requirements.
5 Manufacturing processes
5.1 Smelting method
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Ordering information
5 Manufacturing processes
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking, and quality certificate
Annex A (Normative) Dimension, shape, weight and tolerance for narrow strips and sheared plates and sheets
Standard
GB/T 11251-2025 Alloy structural steel plate;sheet and strip (English Version)
GB/T 11251-2025 Alloy structural steel plate, sheet and strip
1 Scope
This document specifies the ordering information, manufacturing processes, technical requirements, test methods, inspection rules, as well as packaging, marking, and quality certificate for alloy structural steel plates, sheets and strips.
This document is applicable to single hot-rolled steel plates and sheets (hereinafter referred to as single-rolled plates and sheets) with a nominal thickness of 3.0mm to 250mm; and continuously hot-rolled plates, sheets and strips with a nominal thickness of not greater than 25.4mm, including continuously hot-rolled wide strips, sheared plates and sheets and slit wide strips with a nominal width of not less than 600mm, and continuously hot-rolled narrow strips and sheared plates and sheets with a nominal width of less than 600mm (hereinafter referred to as steel plates, sheets and strips).
Note: Single-rolled plates and sheets, as well as steel plates, sheets and strips are collectively referred to as steel products in this document.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (All Parts) Methods for chemical analysis of iron, steel and alloy
GB/T 224 Determination of the depth of decarburization of steels
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 232 Metallic materials - Bend test
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 2970-2016 Method for ultrasonic testing of thicker steel plates
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 3077 Alloy structure 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 Determination of content of nonmetallic inclusions in steel - Micrographic method using standard diagrams
GB/T 11261 Steel and iron - Determination of oxygen content - The pulse heating inert gas fusion-infra-red absorption method
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 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas (routine method)
GB/T 34474. 1-2017 Determination of banded structure of steel - Part 1: Micrographic method using standards diagrams
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 709-2019 apply.
4 Ordering information
The ordering contracts or orders made in accordance with this document shall cover the following information:
a) No. of this document;
b) product name;
c) designation;
d) dimension, shape and tolerance or thickness precision;
e) delivery weight (or quantity);
f) delivery condition;
g) edge condition;
h) surface treatment method and surface quality grade;
i) intended application (if for stamping, it shall be indicated);
j) special requirements.
5 Manufacturing processes
5.1 Smelting method
Contents of GB/T 11251-2025
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Ordering information
5 Manufacturing processes
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking, and quality certificate
Annex A (Normative) Dimension, shape, weight and tolerance for narrow strips and sheared plates and sheets
