GB/T 3207-2025 PDF English
GB/T 3207: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 3207-2025 | 305 | Add to Cart | Auto, 9 seconds. | Bright steel | |
| GB/T 3207-2008 | 150 | Add to Cart | Auto, 9 seconds. | Bright steel | Valid |
| GB/T 3207-1988 | 199 | Add to Cart | 2 days | Bright steel | Obsolete |
GB/T 3207-2025: Bright steel
---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/GBT3207-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.60 CCS H 44 Replacing GB/T 3207-2008, GB/T 36225-2018 Bright steel 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... 7 Annex A (informative) Detection limit of different matrix specimens... 14 Annex B (informative) Detection limit of different matrix specimens... 15 Annex C (informative) Method uncertainty... Error! Bookmark not defined. Bibliography... Error! Bookmark not defined. Bright steel1 Scope
This document specifies the classification code, ordering details, manufacturing process, technical requirements, test methods, inspection rules, packaging, marks, and quality certificate for bright steel. This document applies to flake, polish, and buff steels with a nominal diameter not exceeding 220 mm that require high surface quality.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 -- Allowable deviations of product analyzed chemical composition GB/T 223 (all parts), Iron, steel and alloy GB/T 224, Determination of the depth of decarburization of steels GB/T 225, Steel -- Hardenability test by end quenching (Jominy test) GB/T 226, Test Method for Macrostructure and Defect of Steel by Etching 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 structure steels GB/T 1220, Stainless steel rod GB/T 1222-2025, Spring steels GB/T 1299, Tool and mould steels GB/T 1979, Evaluation of macrostructural defects in structural steels -- Acid etching 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 32547, Method for magnetic flux leakage testing of round steel3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 bright steel Round steel with no rolling defects or decarburized layer on the surface and a bright finish. NOTE. It is further divided into flake steel, polish steel, and buff steel. 3.2 flake steel Round steel that is produced by removing rolling defects and decarburized layers through turning and peeling, followed by rolling. 3.3 polish steel Round steel that has been drawn or peeled and then polished. 3.4 buff steel Round steel that has been drawn, machined and peeled or ground are then polished. 4 Classification code Bright steel is divided into three categories according to different delivery conditions. Their classification codes are shown in Table 1. 5 Ordering content Contracts or orders placed in accordance with this document shall include the following. a) Reference to this document; b) Product name; c) Designation; d) Dimensions and precision; e) Surface roughness level; f) Order weight (or quantity); g) Delivery condition; h) Other requirements. 6 Manufacturing process 6.1 Smelting method The smelting methods for bright steel shall comply with the provisions of the relevant 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 state 6.2.1 The delivery condition of bright steel is divided into three categories according to different cold working methods. flaking, polishing and buffing. 6.2.2 Before production of bright steel, heat treatment may be performed depending on the capacity of the cold working equipment or the requirements of the customer. 6.2.3 As required by the purchaser and specified in the contract, the finished bright steel products may be supplied in a heat-treated state. 7 Technical requirements 7.1 Decarburization layer The surface of bright steel shall not have a decarburized layer. 7.2 Surface quality 7.2.1 The surface of the bright steel shall be clean and smooth. There shall be no visible external defects such as cracks, hairline cracks, folds, scratches, dents, scale, corrosion, or oxide scale. Individual minor scratches, straightening marks, and peeling spirals with a depth not exceeding half the tolerance are allowable. Oxidation discoloration is allowable in heat-treated bright steel. 7.2.2 Upon the purchaser's request, bright steel may be inspected using non-destructive testing methods. The specific non-destructive testing qualification level shall be specified in the contract. 7.2.3 The surface roughness of the bright steel shall conform to the specifications in Table 2.If the supplier can guarantee this, inspection is not required. 7.2.4 Upon the purchaser's request, and after consultation between both parties and as specified in the contract, bright steel with other roughness requirements may be provided. 7.3 Dimensions, appearance, and weight 7.3.1 Dimensions 7.3.1.1 The cross-sectional shape and labeling symbols are shown in Figure 1. 7.3.1.2 The nominal diameter, reference cross-sectional area and reference weight of bright steel are given in Annex A. 7.3.1.3 Upon the purchaser's request, and after consultation between the supplier and the purchaser, and as specified in the contract, other sizes of bright steel within the adjacent size range in Annex A may be supplied. 7.3.2 Allowable diameter deviation 7.3.2.1 The allowable deviation of the nominal diameter of bright steel shall conform to the provisions of Table 3.The allowable deviation level of the nominal diameter shall be specified in the contract. If not specified, nominal diameters not greater than 80 mm shall be supplied according to grade 11 (h11) of this document. Nominal diameters greater than 80 mm shall be supplied according to grade 12 (h12) of this document. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
