GB/T 8749-2021 PDF English
US$170.00 · In stock · Download in 9 secondsGB/T 8749-2021: Hot-rolled quality carbon structural steel strip Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 8749: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 8749-2021 | English | 170 |
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Hot-rolled quality carbon structural steel strip
| Valid |
| GB/T 8749-2008 | English | 85 |
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Hot-rolled quality carbon structural steel strips
| Obsolete |
| GB/T 8749-1988 | English | 199 |
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Hot-rolled quality carbon structural steel strips
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GB/T 8749-2021: Hot-rolled quality carbon structural steel strip---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/GBT8749-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
CCS H 46
Replacing GB/T 8749-2008
Hot-rolled quality carbon structural steel strip
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
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
4 Classification and code ... 7
5 Order content ... 7
6 Size, shape, weight ... 8
7 Technical requirements ... 10
8 Test methods ... 13
9 Inspection rules ... 14
10 Packaging, marking and quality certificate ... 14
Hot-rolled quality carbon structural steel strip
1 Scope
This Standard specifies classification and code, order content, size, shape,
weight, technical requirements, test methods, inspection rules and packaging,
marking, quality certificate for hot-rolled quality carbon structural steel strip.
This Standard is applicable to hot-rolled quality carbon structural steel strip of
which the width is less than 600mm, the thickness is not more than 12mm
(hereinafter referred to as the steel strip). The steel strip with a width of
600mm~750mm can refer to this Standard.
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, Permissible tolerances for chemical composition of steel products
GB/T 223.5, Steel and iron - Determination of acid-soluble silicon and total
silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.12, Methods for chemical analysis of iron, steel and alloy. The
sodium carbonate separation-diphenyl carbazide photometric method for the
determination of chromium content
GB/T 223.19, Methods for chemical analysis of iron, steel and alloy - The
neocuproine-chloroform extraction photometric method for the determination
of copper content
GB/T 223.23, Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.37, Iron, steel and alloy - Determination of nitrogen content -
Indophenol blue spectrophotometric method after distillation separation
GB/T 223.59, Iron, steel and alloy - Determination of phosphorus content -
Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T20125, Low-alloy steel - Determination of multi-element contents -
Inductively coupled plasma atomic emission spectrometric method
GB/T 38813, General requirements for hot-rolled pickled steel sheet and strip
3 Terms and definitions
There are no terms and definitions that need to be defined in this Standard.
4 Classification and code
4.1 Classify according to the edge state:
a) Trimmed steel strip, EC;
b) Un-trimmed steel strip, EM.
4.2 Classify according to thickness accuracy:
a) Ordinary thickness accuracy, PT.A;
b) Higher thickness accuracy, PT.B.
5 Order content
5.1 The order contract or order sheet according to this Standard shall include
the following information:
a) Reference to this Standard;
b) Specification;
c) Designation;
d) Weight;
e) Edge state (EC or EM);
f) Delivery state (hot rolled, pickled or other);
g) Thickness accuracy;
h) Special requirements.
5.2 If the order contract does not specify the edge state, delivery state,
thickness accuracy and other information, then it shall be supplied according to
6.5 Shape
6.5.1 The steel strip shall be delivered in coils. They shall not be loose. The
height of one side of the steel strip coil shall not exceed 50mm.
6.5.2 The sickle bend of untrimmed steel strip is not more than 20mm every 5m.
The sickle bend of the trimmed steel strip shall not exceed 15mm every 5m.
6.6 Steel strip weight
The steel strip is delivered according to actual weight.
7 Technical requirements
7.1 Steel designation and chemical composition
7.1.1 The steel designation and chemical composition (melting analysis) shall
meet the requirements of GB/T 699. Required by the purchaser, agreed by the
supplier and the purchaser and indicated in the contract, the requirements for
harmful elements sulfur and phosphorus in steel can be tightened.
7.1.2 The allowable deviation of the chemical composition of the finished steel
strip shall comply with the relevant regulations of GB/T 222.
7.2 Smelting method
Steel is smelted by converter or electric furnace.
7.3 Delivery state
7.3.1 The steel strip is delivered in hot rolled state. Agreed by the supplier and
the purchaser and indicated in the contract, the steel strip with surface pickling
can be supplied.
7.3.2 When the steel strip is delivered in the pickled state, it is usually supplied
with oil. The applied oil film shall be able to be removed with alkaline solution.
Required by the purchaser, agreed by the supplier and the purchaser and
indicated in the contract, the surface of the pickled steel strip can also be
supplied unoiled.
7.5.2 For steel strips for cold rolling, the bending test shall be negotiated
between the supplier and the purchaser.
7.6 Decarburized layer
Required by the purchaser, the steel strip made of steels of designation 35 and
higher carbon content designations can be used to check the depth of surface
decarburization. The depth of the single-sided total decarburization layer (full
decarburization layer plus partial decarburization layer) shall meet the following
requirements:
a) When the thickness of the steel strip is not more than 3.2mm, the total
depth of the decarburization layer is not more than 0.08mm;
b) When the thickness of the steel strip is greater than 3.2mm, the total depth
of the decarburization layer is not more than 2.5% of the actual thickness
of the steel strip.
7.7 Surface quality
7.7.1 The surface of the steel strip is not allowed to have bubbles, scars, cracks,
folds, inclusions and pressed into the oxide scale, which are harmful to use.
The steel strips are not allowed to have visible delamination, and thin scale or
rust that hinders inspection of surface defects. Local defects such as scratches,
concave surfaces, pits, surface roughness, bumps, whose depth or height does
not exceed half of the thickness tolerance, are allowed. The depth or height
(calculated from the actual size) is calculated on one side. The minimum
thickness allowed by the corresponding specifications of the steel strip shall be
ensured.
7.7.2 Untrimmed steel strips are not allowed to have chips, cracks and
significant edge waves. Other edge defects whose depth is not more than half
of the width tolerance are allowed. The effective width shall ensure the minimum
thickness of the steel strip corresponding to the specifications.
7.7.3 The edge of the trimmed steel strip is allowed to have spurs no larger than
0.5mm.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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