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GB/T 3207: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3207-2025 | English | 305 |
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Bright steel
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| GB/T 3207-2008 | English | 150 |
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Bright steel
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| GB/T 3207-1988 | English | 199 |
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Bright steel
| Obsolete |
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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/GBT3207-2025
GB
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 steel
1 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 steel
3 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.
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