GB/T 3207-2008 English PDF (GBT3207-2008)

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GB/T 3207-2008: Bright steel
GB/T 3207-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing GB/T 3207-1988
Bright steel
ISSUED ON: AUGUST 05, 2008
IMPLEMENTED ON: APRIL 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Classification code ... 6 
5 Size, shape, weight and allowable deviation ... 6 
6 Technical requirements ... 10 
7 Test method ... 11 
8 Inspection rules ... 12 
9 Marking and quality certificate ... 12 
10 Packaging, transportation and storage ... 12 
Bright steel
1 Scope
This standard specifies the terms and definitions, classification code, size,
shape, weight and allowable deviations, technical requirements, test methods,
inspection rules, marks and quality certificates, packaging, transportation and
storage requirements of bright steel.
This standard is applicable to stripped, ground and polished round steel with
high requirements for surface quality.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 2101 General requirement of acceptance packaging marking and
certification for section steel
GB/T 2103 General requirements for acceptance, packing, marking and
quality certification of steel wire
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Bright steel
A bright-surface round steel with no rolling defects and decarburized layer
on the surface. It can be subdivided into flake steel, polish steel, buff steel.
3.2
Flake steel
6.3 Mechanical properties and process properties
The mechanical properties of the bright steel (excluding the properties of the
heat treatment of the specimen) and the process properties are allowed to
fluctuate by ±10% from the corresponding technical standards. The mechanical
properties of the heat treatment of the specimen shall meet the requirements of
the corresponding standard.
6.4 Macrostructure
The macrostructure of bright steel shall meet the requirements of the
corresponding technical standards.
6.5 Microstructure
6.5.1 There shall be no decarburization layer on the surface of the bright steel.
6.5.2 The microstructure of bright steel shall meet the requirements of the
corresponding technical standards.
6.6 Surface quality
6.6.1 The surface of the bright steel shall be clean and smooth; there shall be
no external defects such as cracks, hair lines, folds, scratches, concave
surfaces, scars, rust and oxide scale. It allows the presence of individual slight
scratch, straightened and stripped thread mark which has a depth of not more
than half of tolerance. The bright steel after heat treatment is allowed to have
oxidation color.
6.6.2 The surface roughness of bright steel shall meet the requirements of Table
7. If the supplier can guarantee that the roughness is qualified, the inspection
can be exempted.
6.6.3 According to the requirements of the buyer, after negotiation between the
two parties and indicated in the contract, steel materials with special roughness
requirements can be provided.
Table 7 -- Surface roughness
Category Roughness Rα / µm
Flake steel, SF ≤ 3.0
Polish steel, SP ≤ 5.0
Buff steel, SB ≤ 0.6
7 Test method
7.1 The size and shape of the bright steel shall be measured with a measuring