GB/T 3207-2025 Bright steel English, Anglais, Englisch, Inglés, えいご
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ICS 13.220.10
CCS H 57
National Standard of the People's Republic of China
GB/T 3207-2025
Replaces GB/T 3207-2008
Bright steel
银亮钢
Issue date: 2025-10-31 Implementation date: 2026-05-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and designations
5 Order content
6 Manufacturing processes
7 Technical requirements
References
1 Scope
This document specifies the classification, designations, order content, manufacturing processes, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates for silver bright steel.
This document applies to peeled, polished, and buffed round steel bars with a nominal diameter not exceeding 220 mm that require high surface quality.
2 Normative references
The contents of the following documents, through normative references in this text, constitute indispensable clauses of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies.
GB/T 222 - Permissible variations of chemical composition for rolled steel
GB/T 223 (all parts) - Methods for chemical analysis of iron and steel
GB/T 224 - Method for determination of depth of decarburization in steel
GB/T 225 - Steel - End-quench test for hardenability (Jominy test)
GB/T 226 - Macrostructure and defect etching inspection of steel
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 699 - Quality carbon structural steel
GB/T 1220 - Stainless steel bars
GB/T 1222-2025 - Spring steel
GB/T 1299 - Tool and die steel
GB/T 1979 - Standard rating diagrams for macrostructure defects in structural steel
GB/T 2101 - General requirements for acceptance, packaging, marking, and quality certificates of section steel
GB/T 2103 - General requirements for acceptance, packaging, marking, and quality certificates of steel wires
GB/T 2975 - Steel and steel products - Location and preparation of samples and specimens for mechanical testing
GB/T 3077 - Alloy structural steel
GB/T 3078 - Quality cold-drawn structural steel
GB/T 4162-2022 - Ultrasonic testing method for forged and rolled steel bars
GB/T 4240 - Stainless steel wires
GB/T 4336 - Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 5216 - Hardenability steels
GB/T 6394 - Metal average grain size measurement method
GB/T 8731 - Free-cutting steel
GB/T 10561 - Steel - Determination of non-metallic inclusion content - Standard rating charts micrographic method
GB/T 11260 - Eddy current testing method for round steel
GB/T 11261 - Steel and iron - Determination of oxygen content - Pulse heating inert gas fusion-infrared absorption method
GB/T 15712 - Non heat-treated mechanical steel
GB/T 17505 - Steel and steel products - General technical delivery requirements
GB/T 18254 - High carbon chromium bearing steel
GB/T 20066 - Steel and iron - Sampling and preparation of samples for determination of chemical composition
GB/T 20123 - Steel and iron - Determination of total carbon and sulfur content - High-frequency induction furnace combustion-infrared absorption method (conventional method)
GB/T 32547 - Magnetic flux leakage testing method for round steel
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Bright steel
Round steel with no rolled-in defects and decarburized layer, having bright surface.
Note: Further divided into flake steel, polish steel and buff steel.
3.2
Flake steel
Round steel processed by peeling to remove rolled-in defects and decarburized layer, followed by rolling.
3.3
Polish steel
Round steel processed by polishing after drawing or peeling.
3.4
Buff steel
Round steel processed by buffing after drawing, peeling, or polishing.
4 Classification and designations
Silver bright steel is classified into three types according to delivery conditions, as shown in Table 1.
Table 1 Silver bright steel classification and designations
5 Order content
Contracts or orders under this document shall include the following content:
a) The number of this document;
b) Product name;
c) Grade;
d) Dimensions and tolerance;
e) Surface roughness grade;
f) Order weight (or quantity);
g) Delivery condition;
h) Other requirements.
6 Manufacturing processes
6.1 Melting method
The melting method of silver bright steel shall comply with the provisions of the corresponding product standards such as GB/T 699, GB/T 1220, GB/T 1222, GB/T 1299, GB/T 3077, GB/T 3078, GB/T 4240, GB/T 5216, GB/T 8731, GB/T 15712, and GB/T 18254.
6.2 Delivery condition
6.2.1 Silver bright steel delivery conditions are classified into three types based on cold working method: peeled, polished and buffed.
6.2.2 Prior to production of silver bright steel, heat treatment may be carried out according to cold working equipment capacity or at the buyer's request.
6.2.3 At the buyer's request and specified in contract, silver bright steel finished products can be supplied in heat treated condition.
7 Technical requirements
