Q/BQB 302-2023 PDF in English
Q/BQB 302-2023 (Q/BQB302-2023, QBQB 302-2023, QBQB302-2023)
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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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Standards related to (historical): Q/BQB 302-2023
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Q/BQB 302-2023: PDF in English (QBQB 302-2023) 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
Continuously Hot-Rolled Steel Sheet and Strip for Cold
Forming
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
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination
of Chemical Composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared
5 Information Required for Ordering
5.1 Users need to provide the following information when ordering:
a) This Document number;
b) Product category;
c) Designation, surface treatment method and surface quality level;
d) Specifications and dimensional accuracy (thickness, width, unevenness);
e) Edge state;
f) Usage;
g) Type of verification file.
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.
5.2.3 For hot-rolled pickled steel sheets and strips, if the dimensional accuracy is not specified,
the thickness shall be delivered with higher thickness accuracy and other dimensions shall be
delivered with ordinary accuracy. If the edge condition, surface quality level and whether it is
oiled or not is not specified, it shall be delivered by trimmed state, higher level surface and
oiled state. If the inner diameter of the steel coil is not specified, it shall be delivered with the
inner diameter of the steel coil 610mm.
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. If the customer has higher requirements for thickness accuracy, the
advanced precision PT.C with a specified yield strength less than 360MPa given in Table 4 of
Q/BQB 301 can be selected when ordering.
transportation, loading and unloading and storage conditions, the supplier shall ensure that the
surfaces of the steel sheets and strips shall not rust within 3 months since the completion date
of manufacturing. After negotiation between the supplier and the purchaser, and indicating in
the contract, the hot-rolled pickled surface can also be supplied without oiling.
NOTE: For non-oiled products required by the purchaser, rust may occur; and the surface may be slightly
scratched during transportation, loading, unloading, storage and use processes.
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.
NOTE: Due to the aging nature of steel, it is recommended that users use it as soon as possible.
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.
7.5.3 After the bend test, there shall be no visible cracks on the outer surface of the specimen.
If the supplier can ensure that the bend test is qualified, the test may not be performed.
7.5.4 The mechanical properties of steel sheets and strips with designations of IF HR1, IF HR2
and IF HR3 are referenced in the informative Appendix A, but they are not regarded as
guaranteed conditions.
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.
8.6.3 If the reinspection is unqualified, the individual pieces that have been tested and have
unsatisfactory test results cannot be accepted, but the single pieces of the batch of materials that
have not been tested can be resubmitted for testing and acceptance one by one.
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 PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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