QBB305-2021 PDF English
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Cold rolled low carbon sheet and strip
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Q/BB 305-2021: Cold rolled low carbon sheet and 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/QBB305-2021
ENTERPRISE STANDARD OF BENXI STEEL PLATE CO., LTD.
Replacing Q/BB 305-2019
Cold-rolled low-carbon steel sheet and strip
(EN 10130, ASTM A1008/A1008M, NEQ)
Issued on. SEPTEMBER 09, 2021
Implemented on. NOVEMBER 10, 2021
Issued by. Benxi Steel Plate Co., Ltd.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Classification and code... 5
5 Order contents... 6
6 Size, shape, weight... 7
7 Technical requirements... 7
8 Test methods... 11
9 Inspection rules... 12
10 Numerical rounding rules... 13
11 Packaging, marking, quality certificate (or inspection document)... 13
Appendix A (Informative) Technical differences between this document and EN 10130,
ASTM A1008/A1008M, as well as the reasons... 14
Appendix B (Informative) Comparison of similar standard designations at home and
abroad... 18
Appendix C (Informative) Comparison of surface quality and surface structure grade of
steel sheet and steel strip... 19
Appendix D (Normative) Types of inspection documents in EN 10204... 20
1 Scope
This document specifies the terms and definitions, classification and code, order content,
dimensions, shape, weight, technical requirements, test methods, inspection rules,
numerical rounding rules, packaging, marking, quality certificate (or inspection
document) of cold-rolled low-carbon steel sheets and strips (or inspection document).
This document applies to cold-rolled low-carbon steel sheets and strips (hereinafter
referred to as steel sheets and strips), which are produced by Benxi Steel.
2 Normative references
The contents of the following documents constitute essential provisions of this
document, through normative references in the text. Among them, for dated references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) is applicable to this document.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Methods for chemical analysis of iron, steel and alloy (Applicable part)
GB/T 228.1 Tensile test of metallic materials - Part 1.Tensile test method at room
temperature
GB/T 2523 Measuring method of surface roughness and peak count for cold-rolled
metal sheet (strip)
GB/T 2975 Steel and steel products - Location and preparation of samples and test
pieces for mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents -
- Spark discharge atomic emission spectrometric method (routine method)
GB/T 5027 Metallic materials - Sheet and strip - Determination of plastic strain ratio
3 Terms and definitions
There are no terms and definitions, that need to be defined, in this document.
4 Classification and code
4.1 See Table 1 for the classification of steel plates and strips, by application. See
Appendix B, for comparison of similar designations, at home and abroad.
4.2 See Table 2 for the classification of steel sheets and strips, by surface structure. For
the comparison of surface structure at home and abroad, see Appendix C
4.3 See Table 3 for the classification of steel sheets and strips, by surface quality. For
the comparison of surface quality at home and abroad, see Appendix C
5 Order contents
5.1 Contracts or orders, which are placed under this document, shall include the
following.
5.2 If the buyer requires "final trimming", it shall be indicated in the order contract or
order. However, if the buyer does not specify "final trimming", the supplier
(manufacturer) shall carry out the trimming, according to the actual production.
5.3 If the specific requirements of surface structure, dimensional accuracy, shape
(camber, unevenness, etc.)
6 Size, shape, weight
The size, shape, weight, allowable deviation of steel sheets and strips shall comply with
the requirements of Q/BB 301.
7 Technical requirements
7.1 Designation and chemical composition
7.1.1 The designation and chemical composition (melting analysis) of the steel shall
comply with the provisions in Table 4 and Table 5.
7.1.2 The allowable deviation of chemical composition of finished steel sheets and
strips shall comply with the provisions of GB/T 222.
7.2 Smelting method
Steel used for steel sheets and strips is smelted in an oxygen converter.
7.3 Delivery status
7.3.1 Steel sheets and strips are delivered, after annealing and flattening.
7.4 Mechanical properties
7.4.1 The supplier guarantees that, within 6 months from the date of completion of
manufacture, the mechanical properties of steel sheets and strips (except DC01 and
SPCC designations) shall meet the requirements of Table 6, Table 7, Table 8.
7.6.2 The surface quality of steel sheets and strips shall be classified into three grades;
their characteristics shall meet the requirements of Table 10.
7.6.3 In the process of continuous production of steel strips, because local surface
defects are not easy to be found and removed, the steel strips are allowed to be delivered
with defects; however, the defective parts shall not exceed 6% of the total length of
each coil of steel strips.
7.7 Surface structure
The surface structure's classification and roughness requirements of steel sheets and
strips shall comply with the requirements in Table 11.
8 Test methods
8.1 The chemical composition test of steel is generally carried out, according to GB/T
223 (applicable parts), GB/T 4336, GB/T 20123, GB/T 20125, GB/T20126 or general
methods; however, the arbitration shall be conducted, according to GB/T 223
(applicable parts).
8.3 The inspection items and test methods of each batch of steel sheets and strips shall
comply with the requirements in Table 12.
9 Inspection rules
9.1 Inspection and acceptance
The inspection and acceptance of steel sheets and strips shall be carried out, by the
inspection and testing department of the supplier.
9.3 Sampling
The sampling method, sampling location, sampling quantity of steel sheets and strips
shall comply with the provisions in Table 12.
9.4 Reinspection and judgment rules
9.4.1 The determination of steel sheets and strips shall comply with the provisions of
GB/T 17505.
9.4.2 If the steel sheet and steel strip are unqualified in the initial inspection, it shall
randomly take double quantity of specimens from the same batch, for re-inspection of
the unqualified item.
10 Numerical rounding rules
The test results of chemical composition and mechanical properties shall be rounded,
according to the rounding value comparison method. The rounding rules shall be in
accordance with the provisions of GB/T 8170.
Q/BB 305-2021
ENTERPRISE STANDARD OF BENXI STEEL PLATE CO., LTD.
Replacing Q/BB 305-2019
Cold-rolled low-carbon steel sheet and strip
(EN 10130, ASTM A1008/A1008M, NEQ)
Issued on. SEPTEMBER 09, 2021
Implemented on. NOVEMBER 10, 2021
Issued by. Benxi Steel Plate Co., Ltd.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Classification and code... 5
5 Order contents... 6
6 Size, shape, weight... 7
7 Technical requirements... 7
8 Test methods... 11
9 Inspection rules... 12
10 Numerical rounding rules... 13
11 Packaging, marking, quality certificate (or inspection document)... 13
Appendix A (Informative) Technical differences between this document and EN 10130,
ASTM A1008/A1008M, as well as the reasons... 14
Appendix B (Informative) Comparison of similar standard designations at home and
abroad... 18
Appendix C (Informative) Comparison of surface quality and surface structure grade of
steel sheet and steel strip... 19
Appendix D (Normative) Types of inspection documents in EN 10204... 20
1 Scope
This document specifies the terms and definitions, classification and code, order content,
dimensions, shape, weight, technical requirements, test methods, inspection rules,
numerical rounding rules, packaging, marking, quality certificate (or inspection
document) of cold-rolled low-carbon steel sheets and strips (or inspection document).
This document applies to cold-rolled low-carbon steel sheets and strips (hereinafter
referred to as steel sheets and strips), which are produced by Benxi Steel.
2 Normative references
The contents of the following documents constitute essential provisions of this
document, through normative references in the text. Among them, for dated references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) is applicable to this document.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Methods for chemical analysis of iron, steel and alloy (Applicable part)
GB/T 228.1 Tensile test of metallic materials - Part 1.Tensile test method at room
temperature
GB/T 2523 Measuring method of surface roughness and peak count for cold-rolled
metal sheet (strip)
GB/T 2975 Steel and steel products - Location and preparation of samples and test
pieces for mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents -
- Spark discharge atomic emission spectrometric method (routine method)
GB/T 5027 Metallic materials - Sheet and strip - Determination of plastic strain ratio
3 Terms and definitions
There are no terms and definitions, that need to be defined, in this document.
4 Classification and code
4.1 See Table 1 for the classification of steel plates and strips, by application. See
Appendix B, for comparison of similar designations, at home and abroad.
4.2 See Table 2 for the classification of steel sheets and strips, by surface structure. For
the comparison of surface structure at home and abroad, see Appendix C
4.3 See Table 3 for the classification of steel sheets and strips, by surface quality. For
the comparison of surface quality at home and abroad, see Appendix C
5 Order contents
5.1 Contracts or orders, which are placed under this document, shall include the
following.
5.2 If the buyer requires "final trimming", it shall be indicated in the order contract or
order. However, if the buyer does not specify "final trimming", the supplier
(manufacturer) shall carry out the trimming, according to the actual production.
5.3 If the specific requirements of surface structure, dimensional accuracy, shape
(camber, unevenness, etc.)
6 Size, shape, weight
The size, shape, weight, allowable deviation of steel sheets and strips shall comply with
the requirements of Q/BB 301.
7 Technical requirements
7.1 Designation and chemical composition
7.1.1 The designation and chemical composition (melting analysis) of the steel shall
comply with the provisions in Table 4 and Table 5.
7.1.2 The allowable deviation of chemical composition of finished steel sheets and
strips shall comply with the provisions of GB/T 222.
7.2 Smelting method
Steel used for steel sheets and strips is smelted in an oxygen converter.
7.3 Delivery status
7.3.1 Steel sheets and strips are delivered, after annealing and flattening.
7.4 Mechanical properties
7.4.1 The supplier guarantees that, within 6 months from the date of completion of
manufacture, the mechanical properties of steel sheets and strips (except DC01 and
SPCC designations) shall meet the requirements of Table 6, Table 7, Table 8.
7.6.2 The surface quality of steel sheets and strips shall be classified into three grades;
their characteristics shall meet the requirements of Table 10.
7.6.3 In the process of continuous production of steel strips, because local surface
defects are not easy to be found and removed, the steel strips are allowed to be delivered
with defects; however, the defective parts shall not exceed 6% of the total length of
each coil of steel strips.
7.7 Surface structure
The surface structure's classification and roughness requirements of steel sheets and
strips shall comply with the requirements in Table 11.
8 Test methods
8.1 The chemical composition test of steel is generally carried out, according to GB/T
223 (applicable parts), GB/T 4336, GB/T 20123, GB/T 20125, GB/T20126 or general
methods; however, the arbitration shall be conducted, according to GB/T 223
(applicable parts).
8.3 The inspection items and test methods of each batch of steel sheets and strips shall
comply with the requirements in Table 12.
9 Inspection rules
9.1 Inspection and acceptance
The inspection and acceptance of steel sheets and strips shall be carried out, by the
inspection and testing department of the supplier.
9.3 Sampling
The sampling method, sampling location, sampling quantity of steel sheets and strips
shall comply with the provisions in Table 12.
9.4 Reinspection and judgment rules
9.4.1 The determination of steel sheets and strips shall comply with the provisions of
GB/T 17505.
9.4.2 If the steel sheet and steel strip are unqualified in the initial inspection, it shall
randomly take double quantity of specimens from the same batch, for re-inspection of
the unqualified item.
10 Numerical rounding rules
The test results of chemical composition and mechanical properties shall be rounded,
according to the rounding value comparison method. The rounding rules shall be in
accordance with the provisions of GB/T 8170.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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