GB/T 11251-2025 PDF English
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GB/T 11251: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 11251-2025 | 275 | Add to Cart | Auto, 9 seconds. | Alloy structural steel plate, sheet and strip | Valid |
| GB/T 11251-2020 | 135 | Add to Cart | Auto, 9 seconds. | Alloy structural steel plate and strip | Valid |
| GB/T 11251-2009 | 125 | Add to Cart | Auto, 9 seconds. | Hot-rolled alloy structural steel plates | Obsolete |
| GB/T 11251-1989 | 279 | Add to Cart | 3 days | Hot-rolled alloy structural steel plates | Obsolete |
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GB/T 11251-2025: Alloy structural steel plate, sheet and strip
---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/GBT11251-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 CCS H 46 GB/T 11251-2025 Replacing GB/T 11251-2020, GB/T 37601-2019 Alloy structural steel plate, sheet and strip Issued on: OCTOBER 31, 2025 Implemented on: MAY 01, 2026 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... 6 4 Ordering details... 6 5 Manufacturing process... 7 6 Technical requirements... 7 7 Test methods... 13 8 Inspection rules... 14 9 Packaging, marking, and quality certificates... 15 Annex A (normative) Dimensions, shape, weight, and tolerance of narrow steel strip and sheared steel plate/sheet... 16 Alloy structural steel plate, sheet and strip1 Scope
This document specifies the ordering details, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates for alloy structural steel plate/sheet and strip. This document applies to single-sheet hot-rolled steel plate/sheet with a nominal thickness of 3.0 mm ~ 250 mm (hereinafter referred to as single-rolled steel plate/sheet); hot-continuously-rolled steel plate/sheet and strip with a nominal thickness not greater than 25.4 mm, including hot-continuously-rolled wide steel strip, sheared steel plate/sheet, and slit steel strip with a nominal width not less than 600 mm, and hot- continuously-rolled narrow steel strip and sheared steel plate/sheet with a nominal width less than 600 mm (hereinafter referred to as steel plate/sheet and strip). NOTE. Single-rolled steel plate/sheet, steel plate/sheet and strip are collectively referred to as steel products in this document.2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 222 Steels and alloys - Permissible deviations of product analyzed chemical composition 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 testing 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 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 judgement 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 diagrams3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 709-2019 apply.4 Ordering details
A contract or order placed according to this document shall include the following. a) serial number of this document; b) product name; c) designation; d) dimensions, shape, and tolerance or thickness accuracy; e) delivery weight (or quantity); f) delivery condition; g) edge condition; h) surface treatment and surface quality grade; i) processing purpose (if for stamping, this shall be specified); j) special requirements.5 Manufacturing process
5.1 Smelting method Steel is smelted in a converter or electric furnace and refined outside the furnace. Unless otherwise specified by the purchaser, the smelting method shall be selected by the supplier. 5.2 Delivery condition 5.2.1 Single-rolled steel plate/sheet 5.2.1.1 Single-rolled steel plate/sheet is delivered in high-temperature tempered condition. Agreed upon between the supplier and the purchaser, and specified in the contract, delivery may also be in annealed, normalized, normalized and tempered, or quenched and tempered conditions. 5.2.1.2 If single-rolled steel plate/sheet can guarantee the mechanical properties specified in 6.2.1.3, normalized rolling may be used instead of normalizing treatment. 5.2.2 Steel plate/sheet and strip Steel plate/sheet and strip are delivered in hot-rolled condition. Agreed upon between the supplier and the purchaser, delivery may also be in heat-treated condition, and the heat treatment method shall be specified in the contract.6 Technical requirements
6.1 Designation and chemical composition 6.1.1 The designation and chemical composition of steel shall comply with the provisions of GB/T 3077.Agreed upon between the supplier and the purchaser, and specified in the contract, steel products with a sulfur content of 0.015 % ~ 0.035 % or not greater than 0.005 %, or steel products with a phosphorus content not greater than 0.015 %, may be supplied. 6.1.2 The tolerance of chemical composition of finished products of steel products shall comply with the provisions of GB/T 222. 6.2 Mechanical properties 6.2.1 Single-rolled steel plate/sheet 6.2.1.1 The surface hardness of single-rolled steel plate/sheet delivered in high- temperature tempered condition shall comply with the provisions of GB/T 3077. 6.2.1.2 The mechanical properties of single-rolled steel plate/sheet with a nominal thickness not greater than 100 mm and delivered in annealed condition shall comply with the provisions of Table 1.The mechanical properties of single-rolled steel plate/sheet with a nominal thickness greater than 100 mm and other designations not specified in Table 1 shall be determined through negotiation between the supplier and the purchaser. 6.2.1.3 For single-rolled steel plate/sheet delivered in normalized condition, provided that the elongation after fracture complies with the provisions of Table 1, the upper limit of tensile strength is allowed to be increased by 50 MPa compared to Table 1. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
