Q/BQB 418-2023 PDF English
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Cold-rolled advanced high strength steel sheet and strip
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Cold-rolled advanced high strength steel sheet and strip
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| Q/BQB 418-2019 | English | 170 |
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Cold-rolled advanced high-strength steel plate and strip
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Cold-rolled advanced high-strength steel plate and strip
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Dual-phase High Strength Cold Rolled Steel Plate and Strip
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Q/BQB 418-2023: Cold-rolled advanced high strength steel 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/QBQB418-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 418-2021
Cold-Rolled Advanced High Strength Steel Sheet and Strip
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... 5
2 Normative References... 5
3 Terms and Definitions... 6
4 Classification and Code... 7
5 Information Required for Ordering... 9
6 Dimension, Shape, Weight and Allowable Deviation... 9
7 Technical Requirements... 10
8 Inspection and Testing... 14
9 Packaging, Marking and Inspection Documents... 16
10 Rules for Rounding off of Values... 16
11 Comparison of Designation Similarity... 16
Appendix A (Informative) Comparison List of Similar Designations between this
Document and Relevant Domestic/Foreign Standards... 17
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document was formulated by reference of EN 10338.2015 and VDA 239-100.2016.
This Document replaced Q/BQB 418-2021 Cold-Rolled Advanced High-Strength Steel Plate
and Strip.
Compared with Q/BQB 418-2021, the major technical changes of this Document are as follows.
--- Revise the Normative References; deleted the quotation of JIS Z 2241;
--- Add HC1000/1470DP designation and corresponding technical indicator requirements;
--- Add B420/780DP designation and corresponding technical indicator requirements; delete
B400/780DP designation;
--- Modify the upper limit requirements for Si content of 590DP and 780DP series
designations;
--- Modify the requirements for Al composition specified in Table 4;
--- Modify the provisions for tensile specimens in Tables 5, 6, 7, 8, 9, 10 and 11; uniformly
adopt the P17 specimen specified in GB/T 228.1; and supplement the description of using
longitudinal tensile specimens;
--- Adjust Table 8 to distinguish between tensile test and bending test;
--- In 8.3 tensile test method, add the second-rate requirement;
--- Change the description of "Description of Value-n detection method " in Clause 8.4;
--- Revise Appendix C Comparison list of similar designations of relevant domestic and
foreign standards;
--- Editorial modification of the document.
This Document was proposed by Manufacturing and Management Department of Baoshan Iron
and Steel Co., Ltd.
This Document shall be under the jurisdiction of Manufacturing and Management Department
of Baoshan Iron and Steel Co., Ltd.
This Document was drafted by Manufacturing and Management Department of Baoshan Iron
and Steel Co., Ltd.
Chief drafting staffs of this Document. Yuan Min.
The historical editions replaced by this Document are as follows.
Q/BQB 418-1999, Q/BQB 418-2003, Q/BQB 418-2009, Q/BQB 418-2014, Q/BQB 418-2018,
Q/BQB 418-2019, and Q/BQB 418-2021.
Cold-Rolled Advanced High Strength Steel Sheet and Strip
1 Scope
This Document specifies the terms and definitions, classification and code, dimensions, shape,
weight, technical requirements, inspection and testing, packaging, marking and inspection
documents of cold-rolled advanced high-strength steel sheet and strip.
This Document is applicable to cold-rolled advanced high-strength steel sheet and strip
(hereinafter referred to as steel sheet and strip) with a thickness of 0.50mm ~ 2.5mm produced
by Baoshan Iron & Steel Co., Ltd.
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 Permissible tolerances for chemical composition of steel products
GB/T 223 Methods for chemical analysis of iron, steel and alloy
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 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 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 Metallic materials-Sheet and strip - Determination of tensile strain hardening
exponent (n-values)
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of
limiting values
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 Dual phase steels (DP)
The microstructure of the steel is ferrite and martensite; and the martensite structure is dispersed
in the ferrite matrix in the form of islands. Dual-phase steel has a low yield strength ratio and
high work hardening performance. At the same yield strength level, high-strength low-alloy
steel has higher strength and is one of the preferred materials for structural parts.
3.4 Complex phase steels (CP)
The microstructure of the steel is martensite, bainite, ferrite and a small amount of retained
austenite. Its matrix structure is mainly hard phase martensite and bainite, with a relatively high
yield strength ratio, and a slightly lower uniform elongation than dual-phase steel (DP) and
transformation induced plasticity steel (TRIP) with the same tensile strength level. The tensile
strength is usually above 600MPa, and the bending performance is excellent.
3.5 Quenching and partitioning steel (QP)
QP steel is a type of high-formability ultra-high-strength steel produced by quenching-
partitioning process. The microstructure of the steel is a multi-phase composite composition of
martensite + ferrite + retained austenite.
4 Classification and Code
4.1 The classification of steel plate and strip according to the use shall comply with the
provisions of Table 1.
4.2 The classification of steel sheet and strip according to surface quality shall comply with the
provisions of Table 2.
5 Information Required for Ordering
5.1 When ordering, the user shall provide the following information.
5.2 If the size, roughness accuracy, surface quality level, edge state and packaging method are
not specified in the ordering contract,
6 Dimension, Shape, Weight and Allowable Deviation
The dimension, shape, weight and allowable deviation of steel sheets and strips shall comply
with the provisions of Q/BQB 401.
7 Technical Requirements
7.1 Chemical composition
7.1.1 The chemical composition (melting analysis) of steel shall comply with the provisions of
Table 4.
7.2 Smelting method
The 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 leveling after cold rolling.
7.4 Mechanical properties
7.4.1 The supplier guarantees that within 6 months from the date of completion of
manufacturing, the mechanical properties of steel sheets and strips shall comply with the
provisions of Tables 5, 6, 7, 8, 9, 10 and 11, respectively.
7.4.2 When steel sheets and strips are supplied as specified parts, the supplier and the purchaser
may agree on a range of mechanical properties that meet the processing requirements of the
parts as the acceptance basis. At this time, the mechanical properties specified in Tables 5, 6, 7,
8, 9, 10 and 11 shall no longer be the basis for delivery.
7.5 Surface quality
7.5.1 The surface of steel sheets and strips shall not have holes, surface cracks, laminations and
other defects that are harmful to use.
7.5.2 The characteristics of each surface quality level of steel sheets and strips shall comply
with the provisions of Table 12.
7.6 Surface structure
The average surface roughness of steel sheets and strips shall be controlled according to the
requirements of Table 13.
8 Inspection and Testing
8.1 The appearances of steel sheets and strips shall be inspected by the naked eye.
8.2 The size and shape of steel sheets and strips shall be measured by appropriate measuring
tools.
8.3 The tensile test shall be carried out in accordance with Method-B of GB/T 228.1-2021.In
order to improve the reproducibility of the measurement results, it is recommended to use the
beam displacement rate control method.
8.4 The Value-n is calculated within the plastic strain range of 10% ~ 20%. When the maximum
force plastic elongation Ag is less than 20% but no less than 12%, the calculated strain range
shall be 10% to Ag. When Ag is less than 12%, the strain hardening index shall be reported
(nAgt=εp, Agt) as the true strain value (εp, Agt) calculated according to the maximum force total
elongation (Agt).
8.6 The inspection items, number of specimens, sampling methods and test methods of each
batch of steel sheets and strips shall comply with the provisions of Table 14.
8.7 The supplier may use different inspection and test methods for acceptance testing. In case
of disputes, the inspection and test methods specified in this Document and related technical
requirements shall be used for testing.
8.8 Reinspection
For tensile test, bending test and Value-n test, if any test result does not meet the requirements
of this Document, double the number of samples from the same batch shall be randomly
selected for reinspection of the unqualified item. If the reinspection result (including all
indicators required by the test item) is qualified, the whole batch is qualified.
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 400.If the purchaser has special requirements for packaging, it shall
be indicated in the contract.
10 Rules for Rounding off of Values
Numerical determination adopts the rounding value comparison method, and numerical
rounding shall comply with the provisions of GB/T 8170.
11 Comparison of Designation Similarity
See Appendix A for a comparison list of similar designations between this Document and
relevant domestic/foreign standards.
Appendix A
(Informative)
Comparison List of Similar Designations between this Document and
Relevant Domestic/Foreign Standards
Table A.1
Q/BQB 418-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 418-2021
Cold-Rolled Advanced High Strength Steel Sheet and Strip
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... 5
2 Normative References... 5
3 Terms and Definitions... 6
4 Classification and Code... 7
5 Information Required for Ordering... 9
6 Dimension, Shape, Weight and Allowable Deviation... 9
7 Technical Requirements... 10
8 Inspection and Testing... 14
9 Packaging, Marking and Inspection Documents... 16
10 Rules for Rounding off of Values... 16
11 Comparison of Designation Similarity... 16
Appendix A (Informative) Comparison List of Similar Designations between this
Document and Relevant Domestic/Foreign Standards... 17
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document was formulated by reference of EN 10338.2015 and VDA 239-100.2016.
This Document replaced Q/BQB 418-2021 Cold-Rolled Advanced High-Strength Steel Plate
and Strip.
Compared with Q/BQB 418-2021, the major technical changes of this Document are as follows.
--- Revise the Normative References; deleted the quotation of JIS Z 2241;
--- Add HC1000/1470DP designation and corresponding technical indicator requirements;
--- Add B420/780DP designation and corresponding technical indicator requirements; delete
B400/780DP designation;
--- Modify the upper limit requirements for Si content of 590DP and 780DP series
designations;
--- Modify the requirements for Al composition specified in Table 4;
--- Modify the provisions for tensile specimens in Tables 5, 6, 7, 8, 9, 10 and 11; uniformly
adopt the P17 specimen specified in GB/T 228.1; and supplement the description of using
longitudinal tensile specimens;
--- Adjust Table 8 to distinguish between tensile test and bending test;
--- In 8.3 tensile test method, add the second-rate requirement;
--- Change the description of "Description of Value-n detection method " in Clause 8.4;
--- Revise Appendix C Comparison list of similar designations of relevant domestic and
foreign standards;
--- Editorial modification of the document.
This Document was proposed by Manufacturing and Management Department of Baoshan Iron
and Steel Co., Ltd.
This Document shall be under the jurisdiction of Manufacturing and Management Department
of Baoshan Iron and Steel Co., Ltd.
This Document was drafted by Manufacturing and Management Department of Baoshan Iron
and Steel Co., Ltd.
Chief drafting staffs of this Document. Yuan Min.
The historical editions replaced by this Document are as follows.
Q/BQB 418-1999, Q/BQB 418-2003, Q/BQB 418-2009, Q/BQB 418-2014, Q/BQB 418-2018,
Q/BQB 418-2019, and Q/BQB 418-2021.
Cold-Rolled Advanced High Strength Steel Sheet and Strip
1 Scope
This Document specifies the terms and definitions, classification and code, dimensions, shape,
weight, technical requirements, inspection and testing, packaging, marking and inspection
documents of cold-rolled advanced high-strength steel sheet and strip.
This Document is applicable to cold-rolled advanced high-strength steel sheet and strip
(hereinafter referred to as steel sheet and strip) with a thickness of 0.50mm ~ 2.5mm produced
by Baoshan Iron & Steel Co., Ltd.
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 Permissible tolerances for chemical composition of steel products
GB/T 223 Methods for chemical analysis of iron, steel and alloy
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 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 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 Metallic materials-Sheet and strip - Determination of tensile strain hardening
exponent (n-values)
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of
limiting values
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 Dual phase steels (DP)
The microstructure of the steel is ferrite and martensite; and the martensite structure is dispersed
in the ferrite matrix in the form of islands. Dual-phase steel has a low yield strength ratio and
high work hardening performance. At the same yield strength level, high-strength low-alloy
steel has higher strength and is one of the preferred materials for structural parts.
3.4 Complex phase steels (CP)
The microstructure of the steel is martensite, bainite, ferrite and a small amount of retained
austenite. Its matrix structure is mainly hard phase martensite and bainite, with a relatively high
yield strength ratio, and a slightly lower uniform elongation than dual-phase steel (DP) and
transformation induced plasticity steel (TRIP) with the same tensile strength level. The tensile
strength is usually above 600MPa, and the bending performance is excellent.
3.5 Quenching and partitioning steel (QP)
QP steel is a type of high-formability ultra-high-strength steel produced by quenching-
partitioning process. The microstructure of the steel is a multi-phase composite composition of
martensite + ferrite + retained austenite.
4 Classification and Code
4.1 The classification of steel plate and strip according to the use shall comply with the
provisions of Table 1.
4.2 The classification of steel sheet and strip according to surface quality shall comply with the
provisions of Table 2.
5 Information Required for Ordering
5.1 When ordering, the user shall provide the following information.
5.2 If the size, roughness accuracy, surface quality level, edge state and packaging method are
not specified in the ordering contract,
6 Dimension, Shape, Weight and Allowable Deviation
The dimension, shape, weight and allowable deviation of steel sheets and strips shall comply
with the provisions of Q/BQB 401.
7 Technical Requirements
7.1 Chemical composition
7.1.1 The chemical composition (melting analysis) of steel shall comply with the provisions of
Table 4.
7.2 Smelting method
The 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 leveling after cold rolling.
7.4 Mechanical properties
7.4.1 The supplier guarantees that within 6 months from the date of completion of
manufacturing, the mechanical properties of steel sheets and strips shall comply with the
provisions of Tables 5, 6, 7, 8, 9, 10 and 11, respectively.
7.4.2 When steel sheets and strips are supplied as specified parts, the supplier and the purchaser
may agree on a range of mechanical properties that meet the processing requirements of the
parts as the acceptance basis. At this time, the mechanical properties specified in Tables 5, 6, 7,
8, 9, 10 and 11 shall no longer be the basis for delivery.
7.5 Surface quality
7.5.1 The surface of steel sheets and strips shall not have holes, surface cracks, laminations and
other defects that are harmful to use.
7.5.2 The characteristics of each surface quality level of steel sheets and strips shall comply
with the provisions of Table 12.
7.6 Surface structure
The average surface roughness of steel sheets and strips shall be controlled according to the
requirements of Table 13.
8 Inspection and Testing
8.1 The appearances of steel sheets and strips shall be inspected by the naked eye.
8.2 The size and shape of steel sheets and strips shall be measured by appropriate measuring
tools.
8.3 The tensile test shall be carried out in accordance with Method-B of GB/T 228.1-2021.In
order to improve the reproducibility of the measurement results, it is recommended to use the
beam displacement rate control method.
8.4 The Value-n is calculated within the plastic strain range of 10% ~ 20%. When the maximum
force plastic elongation Ag is less than 20% but no less than 12%, the calculated strain range
shall be 10% to Ag. When Ag is less than 12%, the strain hardening index shall be reported
(nAgt=εp, Agt) as the true strain value (εp, Agt) calculated according to the maximum force total
elongation (Agt).
8.6 The inspection items, number of specimens, sampling methods and test methods of each
batch of steel sheets and strips shall comply with the provisions of Table 14.
8.7 The supplier may use different inspection and test methods for acceptance testing. In case
of disputes, the inspection and test methods specified in this Document and related technical
requirements shall be used for testing.
8.8 Reinspection
For tensile test, bending test and Value-n test, if any test result does not meet the requirements
of this Document, double the number of samples from the same batch shall be randomly
selected for reinspection of the unqualified item. If the reinspection result (including all
indicators required by the test item) is qualified, the whole batch is qualified.
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 400.If the purchaser has special requirements for packaging, it shall
be indicated in the contract.
10 Rules for Rounding off of Values
Numerical determination adopts the rounding value comparison method, and numerical
rounding shall comply with the provisions of GB/T 8170.
11 Comparison of Designation Similarity
See Appendix A for a comparison list of similar designations between this Document and
relevant domestic/foreign standards.
Appendix A
(Informative)
Comparison List of Similar Designations between this Document and
Relevant Domestic/Foreign Standards
Table A.1
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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