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Q/BQB 312-2023: Continuously hot-rolled advanced high strength steel sheet and strip for cold forming
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BQB®
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD.
Replacing Q/BQB 312-2018
Continuously hot-rolled advanced high strength steel sheet
and strip for cold forming
Issued on. APRIL 09, 2023
Implemented on. JULY 01, 2023
Issued by. Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Classification and code... 7
5 Information required for ordering... 8
6 Dimensions, shape, weight and tolerances... 9
7 Technical requirements... 9
8 Inspection and test... 15
9 Packaging, marking and inspection documents... 16
10 Rules of rounding off of numerical values... 17
11 Appendix... 17
Appendix A (Informative) Comparison table of similar designations between this
document and relevant standards... 18
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This document is formulated with reference to EN 10338.2015 and in combination with
Baosteel’s actual situation.
This document replaces Q/BQB 312-2018 Advanced high-strength continuously-hot-
rolled steel sheets and strips for cold forming. Compared with Q/BQB 312-2018, in
addition to structural adjustments and editorial changes, the main technical changes are
as follows.
-- To normative references, add the year number of GB/T 228.1, and change the
year number of GB/T 24524;
-- Change terms and definitions;
-- Add the designation BR780/980HE and corresponding technical requirements;
-- In Table 2, change the lower limit of aluminum content for some designations,
the upper limit of phosphorus for DP600 and the upper limit of manganese for
FB590, and add footnote a for silicon and other element regulations for some
designations;
-- Change the diameter of bending indenter of DP600 in Table 5;
-- Change the provisions of yield strength and elongation after break in Table 6;
-- In Table 7, change the yield strength and tensile strength provisions for FB590,
and change the tensile strength provisions for BR300/450HE and
BR600/780HE;
-- Change the default sampling direction of CP800 tensile test samples in Table
10;
-- Change the elongation after break of SAPH780SF with thickness less than
3.15 mm in Table 11.
Appendix A of this document is an informative appendix.
This document is proposed by the Manufacturing Management Department of Baoshan
Iron and Steel Co., Ltd.
This document is under the jurisdiction of the Manufacturing Management Department
of Baoshan Iron & Steel Co., Ltd.
This document is drafted by the Manufacturing Management Department of Baoshan
Iron and Steel Co., Ltd.
Main drafter of this document. Huang Jinhua.
The previous versions of this document and the documents it replaces are. Q/BQB 312-
2007, Q/BQB 312-2009, Q/BQB 312-2014, and Q/BQB 312-2018.
Continuously hot-rolled advanced high strength steel sheet
and strip for cold forming
1 Scope
This document specifies the dimensions, shape, technical requirements, inspection and
testing, packaging, marking and inspection documents of continuously hot-rolled
advanced high strength steel sheet and strip for cold forming.
This document is applicable to the continuously hot-rolled advanced high strength steel
strip for cold forming produced by Baoshan Iron and Steel Co., Ltd., as well as the
cross-cut steel sheet and longitudinally cut steel strip thereof, hereinafter referred to as
steel sheet and strip.
Note. The advanced high strength steels referred to in this document include the
following steel types. dual phase steel (ferrite + island martensite) (DP), high
hole expansion steel (ferrite + bainite, ferrite or bainite) (HE, or FB, SF),
transformation induced plasticity steel (ferrite + bainite + retained austenite)
(TRIP, or TR), complex phase steel (ferrite + martensite + bainite + precipitation
strengthening) (CP, or MP) and martensitic steel (martensite) (MS).
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 222-2006, Permissible tolerances for chemical composition of steel
products
GB/T 223, Methods for chemical analysis 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 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 5028-2008, Metallic materials - Sheet and strip - Determination of tensile
strain hardening exponent
GB/T 8170, Rules of rounding off for numerical values & expression and
judgment of limiting values
3 Terms and definitions
The following terms and definitions are applicable to this Standard.
3.1
dual phase steel (DP)
Steel whose microstructure is mainly ferrite and martensite, or a small amount of bainite
and other structures.
Note. Dual phase steel is not only of higher tensile strength level, but also of lower
yield ratio and higher work hardening rate.
3.2
high hole expansion steel (HE)
Steel whose microstructure is mainly “ferrite + bainite” or ferrite (or strengthened
ferrite) or bainite (or strengthened bainite), etc.
Note. High hole expansion steel is of higher tensile strength, higher formability and
good flange flanging formability. High hole expansion steel is sometimes also
called ferritic bainite steel (FB) or high flange flanging high strength steel (SF).
3.3
transformation induced plasticity steel (TR)
Steel whose microstructure is mainly ferrite, bainite and retained austenite, where the
retained austenite, during the forming process, can be transformed into martensite.
Note. Transformation induced plasticity steel is of higher work hardening rate,
uniform elongation and tensile strength.
3.4
complex phase steels (CP)
The microstructure is mainly composed of a small amount of martensite, retained
austenite or pearlite distributed in a ferrite and/or bainite matrix.
4 Classification and code
4.1 The designations, steel types, nominal thickness, application and product categories
of steel sheet and steel strip are shown in Table 1.
4.3 According to the surface quality level, it can be divided into.
5 Information required for ordering
5.1 When placing an order, the user needs to provide the following information.
5.2 Omissions in the order contract
5.2.1 When the surface treatment method is not specified, the steel shall be delivered
with the rolled surface.
5.2.2 For hot-rolled steel sheet and steel strip, if the dimensional accuracy is not
specified, they shall be delivered with ordinary accuracy; if the edge state is not
specified, the steel strip shall be delivered with mill edge and the steel sheet shall be
delivered with cut edge.
6 Dimensions, shape, weight and tolerances
6.1 The dimensions, shape, weight and tolerances of steel sheets and strips shall comply
with the provisions of Q/BQB 301.
6.2 Where there are special requirements for the tolerance of the unevenness of steel
sheets and steel strips, they can be negotiated when ordering and indicated in the
contract.
7 Technical requirements
7.1 Designation and chemical composition
7.2 Smelting method
The steel used for steel sheets and steel strips is killed steel smelted in an oxygen
converter.
7.3 Delivery state
Steel sheets and steel strips are delivered in controlled rolled state.
7.4 Surface treatment method
7.4.1 The surface treatment of steel sheets and steel strips can be either rolled surface
or pickled surface.
7.5 Mechanical and technological properties
7.5.1 The mechanical and technological properties of steel sheets and steel strips shall
comply with the requirements of Tables 4 ~ 11.Other performance requirements for
steel sheets and steel strips, if any, can be negotiated when ordering and specified in the
contract.
7.6.2 Steel sheets and steel strips are classified into two levels according to their surface
quality, as shown in Table 12.
7.6.3 For steel strips, since there is no opportunity to cut off the defective parts, delivery
with defects is allowed, but the defective part shall not exceed 5% of the total length of
each roll.
8 Inspection and test
8.1 The appearance of steel sheets and steel strips shall be inspected with the naked eye.
8.2 The dimensions and shape of steel sheets and strips shall be checked using
appropriate measuring tools.
8.5 Sampling frequency
8.5.1 Sampling frequency for chemical composition analysis
The chemical composition is analyzed by smelting furnace.
8.6 Retest
8.6.1 If any test result fails to meet the standard requirements, double the number of
samples from the same batch shall be randomly selected for retesting of the unqualified
item.
8.6.3 If the retest is unqualified, the unit that has been tested, of which the test results
are unqualified, cannot accepted; but the unit that has not been tested in the batch of
materials can be resubmitted to the test and accepted one by one.
9 Packaging, marking and inspection documents
The packaging, marking and inspection documents of steel sheets and steel strips shall
comply with the provisions of Q/BQB 300.
10 Rules of rounding-off of numerical values
The rounded value comparison method is used for numerical determination, and the
rounding of numerical values shall comply with the provisions of GB/T 8170.
11 Appendix
For a comparison table of similar designations between this document and relevant
standards, see Appendix A (informative).
Appendix A
(Informative)
Comparison table of similar designations between this document and relevant
standards
Q/BQB 312-2023
BQB®
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD.
Replacing Q/BQB 312-2018
Continuously hot-rolled advanced high strength steel sheet
and strip for cold forming
Issued on. APRIL 09, 2023
Implemented on. JULY 01, 2023
Issued by. Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Classification and code... 7
5 Information required for ordering... 8
6 Dimensions, shape, weight and tolerances... 9
7 Technical requirements... 9
8 Inspection and test... 15
9 Packaging, marking and inspection documents... 16
10 Rules of rounding off of numerical values... 17
11 Appendix... 17
Appendix A (Informative) Comparison table of similar designations between this
document and relevant standards... 18
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This document is formulated with reference to EN 10338.2015 and in combination with
Baosteel’s actual situation.
This document replaces Q/BQB 312-2018 Advanced high-strength continuously-hot-
rolled steel sheets and strips for cold forming. Compared with Q/BQB 312-2018, in
addition to structural adjustments and editorial changes, the main technical changes are
as follows.
-- To normative references, add the year number of GB/T 228.1, and change the
year number of GB/T 24524;
-- Change terms and definitions;
-- Add the designation BR780/980HE and corresponding technical requirements;
-- In Table 2, change the lower limit of aluminum content for some designations,
the upper limit of phosphorus for DP600 and the upper limit of manganese for
FB590, and add footnote a for silicon and other element regulations for some
designations;
-- Change the diameter of bending indenter of DP600 in Table 5;
-- Change the provisions of yield strength and elongation after break in Table 6;
-- In Table 7, change the yield strength and tensile strength provisions for FB590,
and change the tensile strength provisions for BR300/450HE and
BR600/780HE;
-- Change the default sampling direction of CP800 tensile test samples in Table
10;
-- Change the elongation after break of SAPH780SF with thickness less than
3.15 mm in Table 11.
Appendix A of this document is an informative appendix.
This document is proposed by the Manufacturing Management Department of Baoshan
Iron and Steel Co., Ltd.
This document is under the jurisdiction of the Manufacturing Management Department
of Baoshan Iron & Steel Co., Ltd.
This document is drafted by the Manufacturing Management Department of Baoshan
Iron and Steel Co., Ltd.
Main drafter of this document. Huang Jinhua.
The previous versions of this document and the documents it replaces are. Q/BQB 312-
2007, Q/BQB 312-2009, Q/BQB 312-2014, and Q/BQB 312-2018.
Continuously hot-rolled advanced high strength steel sheet
and strip for cold forming
1 Scope
This document specifies the dimensions, shape, technical requirements, inspection and
testing, packaging, marking and inspection documents of continuously hot-rolled
advanced high strength steel sheet and strip for cold forming.
This document is applicable to the continuously hot-rolled advanced high strength steel
strip for cold forming produced by Baoshan Iron and Steel Co., Ltd., as well as the
cross-cut steel sheet and longitudinally cut steel strip thereof, hereinafter referred to as
steel sheet and strip.
Note. The advanced high strength steels referred to in this document include the
following steel types. dual phase steel (ferrite + island martensite) (DP), high
hole expansion steel (ferrite + bainite, ferrite or bainite) (HE, or FB, SF),
transformation induced plasticity steel (ferrite + bainite + retained austenite)
(TRIP, or TR), complex phase steel (ferrite + martensite + bainite + precipitation
strengthening) (CP, or MP) and martensitic steel (martensite) (MS).
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 222-2006, Permissible tolerances for chemical composition of steel
products
GB/T 223, Methods for chemical analysis 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 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 5028-2008, Metallic materials - Sheet and strip - Determination of tensile
strain hardening exponent
GB/T 8170, Rules of rounding off for numerical values & expression and
judgment of limiting values
3 Terms and definitions
The following terms and definitions are applicable to this Standard.
3.1
dual phase steel (DP)
Steel whose microstructure is mainly ferrite and martensite, or a small amount of bainite
and other structures.
Note. Dual phase steel is not only of higher tensile strength level, but also of lower
yield ratio and higher work hardening rate.
3.2
high hole expansion steel (HE)
Steel whose microstructure is mainly “ferrite + bainite” or ferrite (or strengthened
ferrite) or bainite (or strengthened bainite), etc.
Note. High hole expansion steel is of higher tensile strength, higher formability and
good flange flanging formability. High hole expansion steel is sometimes also
called ferritic bainite steel (FB) or high flange flanging high strength steel (SF).
3.3
transformation induced plasticity steel (TR)
Steel whose microstructure is mainly ferrite, bainite and retained austenite, where the
retained austenite, during the forming process, can be transformed into martensite.
Note. Transformation induced plasticity steel is of higher work hardening rate,
uniform elongation and tensile strength.
3.4
complex phase steels (CP)
The microstructure is mainly composed of a small amount of martensite, retained
austenite or pearlite distributed in a ferrite and/or bainite matrix.
4 Classification and code
4.1 The designations, steel types, nominal thickness, application and product categories
of steel sheet and steel strip are shown in Table 1.
4.3 According to the surface quality level, it can be divided into.
5 Information required for ordering
5.1 When placing an order, the user needs to provide the following information.
5.2 Omissions in the order contract
5.2.1 When the surface treatment method is not specified, the steel shall be delivered
with the rolled surface.
5.2.2 For hot-rolled steel sheet and steel strip, if the dimensional accuracy is not
specified, they shall be delivered with ordinary accuracy; if the edge state is not
specified, the steel strip shall be delivered with mill edge and the steel sheet shall be
delivered with cut edge.
6 Dimensions, shape, weight and tolerances
6.1 The dimensions, shape, weight and tolerances of steel sheets and strips shall comply
with the provisions of Q/BQB 301.
6.2 Where there are special requirements for the tolerance of the unevenness of steel
sheets and steel strips, they can be negotiated when ordering and indicated in the
contract.
7 Technical requirements
7.1 Designation and chemical composition
7.2 Smelting method
The steel used for steel sheets and steel strips is killed steel smelted in an oxygen
converter.
7.3 Delivery state
Steel sheets and steel strips are delivered in controlled rolled state.
7.4 Surface treatment method
7.4.1 The surface treatment of steel sheets and steel strips can be either rolled surface
or pickled surface.
7.5 Mechanical and technological properties
7.5.1 The mechanical and technological properties of steel sheets and steel strips shall
comply with the requirements of Tables 4 ~ 11.Other performance requirements for
steel sheets and steel strips, if any, can be negotiated when ordering and specified in the
contract.
7.6.2 Steel sheets and steel strips are classified into two levels according to their surface
quality, as shown in Table 12.
7.6.3 For steel strips, since there is no opportunity to cut off the defective parts, delivery
with defects is allowed, but the defective part shall not exceed 5% of the total length of
each roll.
8 Inspection and test
8.1 The appearance of steel sheets and steel strips shall be inspected with the naked eye.
8.2 The dimensions and shape of steel sheets and strips shall be checked using
appropriate measuring tools.
8.5 Sampling frequency
8.5.1 Sampling frequency for chemical composition analysis
The chemical composition is analyzed by smelting furnace.
8.6 Retest
8.6.1 If any test result fails to meet the standard requirements, double the number of
samples from the same batch shall be randomly selected for retesting of the unqualified
item.
8.6.3 If the retest is unqualified, the unit that has been tested, of which the test results
are unqualified, cannot accepted; but the unit that has not been tested in the batch of
materials can be resubmitted to the test and accepted one by one.
9 Packaging, marking and inspection documents
The packaging, marking and inspection documents of steel sheets and steel strips shall
comply with the provisions of Q/BQB 300.
10 Rules of rounding-off of numerical values
The rounded value comparison method is used for numerical determination, and the
rounding of numerical values shall comply with the provisions of GB/T 8170.
11 Appendix
For a comparison table of similar designations between this document and relevant
standards, see Appendix A (informative).
Appendix A
(Informative)
Comparison table of similar designations between this document and relevant
standards
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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