GB/T 715-1989 PDF in English
GB/T 715-1989 (GB/T715-1989, GBT 715-1989, GBT715-1989)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 715-1989 | English | 165 |
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Hot-rolled round carbon steel bars for standard parts
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GB/T 715-1989: PDF in English (GBT 715-1989) GB 715-1989 (GB 715-89)
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
GB 715-89
Hot-rolled round carbon steel bars for standard parts
ISSUED ON: FEBRUARY 02, 1989
IMPLEMENTED ON: JANUARY 01, 1990
Issued by:
Ministry of Metallurgical Industry of the People’s Republic of
China
Table of Contents
1 Subject Content and Application Scope ... 3
2 Normative references ... 3
3 Dimension, Appearance, Weight and Allowable Tolerance ... 3
4 Technical Requirements ... 5
5 Test Method ... 7
6 Inspection Rules ... 7
7 Package, Mark and Quality Certificate ... 7
Additional Information: ... 8
Hot-rolled round carbon steel bars for standard parts
1 Subject Content and Application Scope
This Standard stipulates the dimension, appearance, weight and allowable tolerance,
technical requirements, test method, inspection rules, package, marks and quality
certificates etc. of hot-rolled round carbon steel bars for screw, nut, bolt, and rivet.
This Standard is applicable to manufacturing the hot-rolled round carbon steel bars of cold
upsetting or hot upsetting’s screws, nuts, bolts and rivets.
2 Normative references
GB 222 Method of sampling steel for determination of chemical composition and
permissible tolerances for product analysis
GB 223 Methods for chemical analysis of iron, steel and alloy
GB 228 Metallic materials - Test pieces for tensile testing
GB 233 Metallic materials - Forging test
GB 237 Method for flattening test metals
GB 2101 General requirement of acceptance packaging marking and certification for
section steel
GB 2975 Rules for sampling in mechanical and technological testing of steel products
GB 6397 Metallic materials - Test pieces for tensile testing
3 Dimension, Appearance, Weight and Allowable Tolerance
3.1 Dimension, weight and allowable tolerance
3.1.1 The diameter, section area, and theoretical weight of the round steel bar shall
comply with provisions of Table 1.
3.1.2 The allowable tolerance of the diameter of the round steel bar shall comply with
provisions of Table 2.
3.1.3 The out-of-roundness of the round steel bar shall not be more than 0.5 times of the
3.2.2 The specified length of the steel bar shall be within the general length scale and
specified in the Contract; the allowable length tolerance is 600 mm.
3.2.3 According to requirements of the demander, the round steel bar with diameter of less
than 18 mm can be delivered in coil through agreement by both Parties. The minimum coil
weight is not less than 100 kg.
3.3 Appearance
3.3.1 The curvature of per meter of straight round steel bar is not more than 4 mm, and
the total curvature is not more than 0.4% of the length of the steel bar.
3.3.2 Partial deformation is allowed within 150 mm from the end-head of which the steel
bar is sheared by the shearing machine. The inclination of both ends of the steel bar shall
not be more than 30% of the nominal diameter of the steel bar.
3.4 Weight
The steel bar is delivered according to actual weight. Through agreement of both Parties,
the delivery according to the theoretical weight shall be specified in the Contract.
3.5 Marking example
The hot-rolled round carbon steel bar for Φ25 mm standard parts rolled by BL2 steel is
marked as:
Round steel 89-715
89-71525
2 GBBL
GB
4 Technical Requirements
4.1 Designation and chemical compositions
4.1.1 The designation and chemical composition (smelt analysis) of the round steel shall
comply with provisions of Table 3.
4.1.2 The residual copper content in the steel shall not be more than 0.25%; if the Supplier
can assure, the analysis may be exempted.
4.2 Smelting method
Steel is smelted by oxygen converter or open-hearth furnace.
4.3 Delivery state
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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