Q/BQB 302-2023 PDF English
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| Q/BQB 302-2023 | English | 125 |
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Continuously hot-rolled steel sheet and strip for cold forming
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| Q/BQB 302-2020 | English | 160 |
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Continuously hot-rolled steel sheet and strip for cold forming
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| Q/BQB 302-2018 | English | 170 |
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Continuously hot-rolled steel sheet and strip for cold forming
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Q/BQB 302-2023: Continuously hot-rolled steel sheet and strip for cold forming---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/QBQB302-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD.
Replacing Q/BQB 302-2020
Continuously Hot-Rolled Steel Sheet and Strip for Cold
Forming
Issued on. APRIL 9, 2023
Implemented on. JULY 1, 2023
Issued by. Baoshan Iron and Steel 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 Information Required for Ordering... 6
6 Size, Shape, Weight and Tolerance... 6
7 Technical Requirements... 7
8 Inspection and Test... 10
9 Packaging, Marking and Inspection Documents... 12
10 Numerical Rounding Rules... 12
11 Appendix... 12
Appendix A (Informative) References of Mechanical Properties... 13
Appendix B (Informative) Comparison Table between this Document and Similar
Designations in Relevant Standards... 14
1 Scope
This Document specifies the size, shape, technical requirements, inspection and testing,
packaging, marking and inspection documents of continuously hot-rolled steel sheet and strip
for cold forming.
This Document applies to the hot-rolled steel strip for cold forming produced by Baoshan Iron
and Steel Co., Ltd., as well as the steel sheet cut horizontally and the steel strip cut
longitudinally, hereinafter referred to as steel sheet and strip.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223 Chemical Analysis Method of Iron, Steel and Alloy (Applicable Parts)
GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 232 Metallic materials – Bend test
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 8170 Rules of rounding off for numerical values and expression and judgment of
limiting values
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions apply.
4 Classification and Code
4.1 The designations, nominal thickness, uses and product categories of steel sheets and strips
are shown in Table 1.
4.2 According to the surface treatment method, it is divided into pickled surface and rolled
surface.
5 Information Required for Ordering
5.1 Users need to provide the following information when ordering.
5.2 Omissions in the ordering contract
5.2.1 If the surface treatment method is not specified, except for designations BRC1, BRC2 and
BRC3, which are delivered by pickled surfaces, other designations are delivered by rolled
surfaces.
5.2.2 For hot-rolled steel sheets and strips, if the dimensional accuracy is not specified, they
will be delivered with ordinary accuracy; if the edge condition is not specified, the steel strips
will be delivered in an untrimmed state, and the steel plates will be delivered in a trimmed state.
6 Size, Shape, Weight and Tolerance
The size, shape, weight and tolerance of steel sheet and strips shall comply with the provisions
of Q/BQB 301.The tolerance of thickness shall comply with the provisions of Table 2 in
Q/BQB 301.The allowable value of unevenness shall not exceed the specified minimum yield
strength of 300MPa.
7 Technical Requirements
7.1 Designation and chemical composition
7.2 Smelting methods
The steel used for steel sheets and strips is killed steel smelted in an oxygen converter.
7.3 Delivery status
Steel sheets and strips are delivered in hot-rolled condition.
7.4 Surface treatment methods
7.4.1 The surface treatment methods of steel sheets and strips can be rolled surface and pickled
surface.
7.4.2 When steel sheets and strips have hot-rolled pickled surfaces, they are usually supplied
with oil. The oil film shall be removable with alkali aqueous solution. Under normal packaging,
7.5 Mechanical and process properties
7.5.1 The performance guarantee period of steel sheets and strips shall comply with the
provisions of the corresponding Tables 3, 4 and 5.The performance guarantee period of steel
sheets and strips is calculated from the date of completion of product manufacturing.
7.5.2 The mechanical and process properties of steel sheets and strips during the performance
guarantee period shall comply with the provisions of the corresponding Tables 3, 4 and 5.When
used as raw material for cold rolling, the supplier does not need to conduct the test if the supplier
can ensure that the mechanical test is qualified.
7.6 Surface quality
7.6.1 The surface of steel sheets and strips shall not have cracks, scars, folds, bubbles, inclusions
and other defects that are harmful to use; and the steel sheets and strips shall not have
delamination. There must be no parking spots on the steel sheets and strips on the pickled
surface.
7.6.2 Steel sheets and strips are divided into two levels according to surface quality, as shown
in Table 6.
7.7 Special requirements
7.7.1 For cold rolling purposes, according to the requirements of the purchaser, the following
special requirements can be put forward for the steel strip after negotiation between the supplier
and the purchaser and stipulated in the contract.
7.7.2 Other special requirements
Table 7
8 Inspection and Test
8.1 The appearance of steel sheets and strips shall be visually inspected.
Nominal thickness mm Average crown along the entire length of steel strip a mm Average wedge along the entire length of steel strip
a mm
8.2 The size and shape of steel sheets and trips shall be checked with appropriate measuring
tools.
8.3 When selecting the specified inspection and test types, the inspection document types shall
comply with the provisions of 8.4~8.6.
8.5 Sampling frequency
8.5.1 Sampling frequency for chemical composition analysis
Smelting analysis of chemical composition by furnace.
8.5.2 Sampling frequency for mechanical and process properties
Steel sheets and strips shall be accepted in batches, and the batch assembly rules for each batch
shall comply with the provisions in Table 9.
8.6 Reinspection
8.6.1 If a certain test result does not meet the standard requirements, double the number of
specimens will be taken from the same batch for reinspecting of the unqualified item.
8.6.2 If the reinspection results (including all indicators required for the test of the project) are
qualified, the entire batch will be qualified. If even one index of the reinspection results
(including all indicators required for the test of the project) fails, the reinspection shall be
unqualified.
9 Packaging, Marking and Inspection Documents
The packaging, marking and inspection documents of steel sheets and strips shall comply with
the provisions of Q/BQB 300.
10 Numerical Rounding Rules
The numerical judgment adopts the rounding and comparison method, and the numerical
rounding shall comply with the provisions of GB/T 8170.
11 Appendix
The comparison table between this Document and similar designations in relevant standards is
shown in Appendix B (informative).
Q/BQB 302-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD.
Replacing Q/BQB 302-2020
Continuously Hot-Rolled Steel Sheet and Strip for Cold
Forming
Issued on. APRIL 9, 2023
Implemented on. JULY 1, 2023
Issued by. Baoshan Iron and Steel 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 Information Required for Ordering... 6
6 Size, Shape, Weight and Tolerance... 6
7 Technical Requirements... 7
8 Inspection and Test... 10
9 Packaging, Marking and Inspection Documents... 12
10 Numerical Rounding Rules... 12
11 Appendix... 12
Appendix A (Informative) References of Mechanical Properties... 13
Appendix B (Informative) Comparison Table between this Document and Similar
Designations in Relevant Standards... 14
1 Scope
This Document specifies the size, shape, technical requirements, inspection and testing,
packaging, marking and inspection documents of continuously hot-rolled steel sheet and strip
for cold forming.
This Document applies to the hot-rolled steel strip for cold forming produced by Baoshan Iron
and Steel Co., Ltd., as well as the steel sheet cut horizontally and the steel strip cut
longitudinally, hereinafter referred to as steel sheet and strip.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223 Chemical Analysis Method of Iron, Steel and Alloy (Applicable Parts)
GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 232 Metallic materials – Bend test
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 8170 Rules of rounding off for numerical values and expression and judgment of
limiting values
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions apply.
4 Classification and Code
4.1 The designations, nominal thickness, uses and product categories of steel sheets and strips
are shown in Table 1.
4.2 According to the surface treatment method, it is divided into pickled surface and rolled
surface.
5 Information Required for Ordering
5.1 Users need to provide the following information when ordering.
5.2 Omissions in the ordering contract
5.2.1 If the surface treatment method is not specified, except for designations BRC1, BRC2 and
BRC3, which are delivered by pickled surfaces, other designations are delivered by rolled
surfaces.
5.2.2 For hot-rolled steel sheets and strips, if the dimensional accuracy is not specified, they
will be delivered with ordinary accuracy; if the edge condition is not specified, the steel strips
will be delivered in an untrimmed state, and the steel plates will be delivered in a trimmed state.
6 Size, Shape, Weight and Tolerance
The size, shape, weight and tolerance of steel sheet and strips shall comply with the provisions
of Q/BQB 301.The tolerance of thickness shall comply with the provisions of Table 2 in
Q/BQB 301.The allowable value of unevenness shall not exceed the specified minimum yield
strength of 300MPa.
7 Technical Requirements
7.1 Designation and chemical composition
7.2 Smelting methods
The steel used for steel sheets and strips is killed steel smelted in an oxygen converter.
7.3 Delivery status
Steel sheets and strips are delivered in hot-rolled condition.
7.4 Surface treatment methods
7.4.1 The surface treatment methods of steel sheets and strips can be rolled surface and pickled
surface.
7.4.2 When steel sheets and strips have hot-rolled pickled surfaces, they are usually supplied
with oil. The oil film shall be removable with alkali aqueous solution. Under normal packaging,
7.5 Mechanical and process properties
7.5.1 The performance guarantee period of steel sheets and strips shall comply with the
provisions of the corresponding Tables 3, 4 and 5.The performance guarantee period of steel
sheets and strips is calculated from the date of completion of product manufacturing.
7.5.2 The mechanical and process properties of steel sheets and strips during the performance
guarantee period shall comply with the provisions of the corresponding Tables 3, 4 and 5.When
used as raw material for cold rolling, the supplier does not need to conduct the test if the supplier
can ensure that the mechanical test is qualified.
7.6 Surface quality
7.6.1 The surface of steel sheets and strips shall not have cracks, scars, folds, bubbles, inclusions
and other defects that are harmful to use; and the steel sheets and strips shall not have
delamination. There must be no parking spots on the steel sheets and strips on the pickled
surface.
7.6.2 Steel sheets and strips are divided into two levels according to surface quality, as shown
in Table 6.
7.7 Special requirements
7.7.1 For cold rolling purposes, according to the requirements of the purchaser, the following
special requirements can be put forward for the steel strip after negotiation between the supplier
and the purchaser and stipulated in the contract.
7.7.2 Other special requirements
Table 7
8 Inspection and Test
8.1 The appearance of steel sheets and strips shall be visually inspected.
Nominal thickness mm Average crown along the entire length of steel strip a mm Average wedge along the entire length of steel strip
a mm
8.2 The size and shape of steel sheets and trips shall be checked with appropriate measuring
tools.
8.3 When selecting the specified inspection and test types, the inspection document types shall
comply with the provisions of 8.4~8.6.
8.5 Sampling frequency
8.5.1 Sampling frequency for chemical composition analysis
Smelting analysis of chemical composition by furnace.
8.5.2 Sampling frequency for mechanical and process properties
Steel sheets and strips shall be accepted in batches, and the batch assembly rules for each batch
shall comply with the provisions in Table 9.
8.6 Reinspection
8.6.1 If a certain test result does not meet the standard requirements, double the number of
specimens will be taken from the same batch for reinspecting of the unqualified item.
8.6.2 If the reinspection results (including all indicators required for the test of the project) are
qualified, the entire batch will be qualified. If even one index of the reinspection results
(including all indicators required for the test of the project) fails, the reinspection shall be
unqualified.
9 Packaging, Marking and Inspection Documents
The packaging, marking and inspection documents of steel sheets and strips shall comply with
the provisions of Q/BQB 300.
10 Numerical Rounding Rules
The numerical judgment adopts the rounding and comparison method, and the numerical
rounding shall comply with the provisions of GB/T 8170.
11 Appendix
The comparison table between this Document and similar designations in relevant standards is
shown in Appendix B (informative).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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