Q/BQB 418-2023 PDF in English
Q/BQB 418-2023 (Q/BQB418-2023, QBQB 418-2023, QBQB418-2023)
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| Q/BQB 418-2023 | English | 415 |
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Cold-rolled advanced high strength steel sheet and strip
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| Q/BQB 418-2021 | English | 205 |
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Cold-rolled advanced high strength steel sheet and strip
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| Q/BQB 418-2018 | English | 130 |
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Cold-rolled advanced high-strength steel plate and strip
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| Q/BQB 418-2014 | English | 320 |
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Cold-rolled advanced high-strength steel plate and strip
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| Q/BQB 418-2009 | English | 249 |
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Dual-phase High Strength Cold Rolled Steel Plate and Strip
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Standards related to (historical): Q/BQB 418-2023
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Q/BQB 418-2023: PDF in English (QBQB 418-2023) 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.
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
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
absorption method after combustion in an induction furnace (routine method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively
coupled plasma atomic emission spectrometric method
GB/T 20126 Unalloyed steel - Determination of low carbon content - Part 2: Infrared
absorption method after combustion in an induction furnace (with preheating)
Q/BQB 400 Packaging, marking, inspection documents for cold rolled products
Q/BQB 401 Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip
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.
3.2 Martensitic steels (MS)
The microstructure of steel is almost entirely martensitic structure; and martensitic steel
generally has higher tensile strength and higher yield strength ratio.
3.3 Transformation induced plasticity steels (TR)
The microstructure of the steel is ferrite, bainite and retained austenite, of which the content of
retained austenite is no less than 5%. During the forming process, the retained austenite can be
transformed into martensite. Due to its high work hardening rate, this steel has a higher uniform
elongation and higher tensile strength; and has a higher elongation than dual-phase steel at the
same tensile strength level.
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. By utilizing the ultra-high strength brought by
martensite and the transformation-induced plasticity (TRIP) effect of retained austenite, it can
obtain better forming performance than traditional ultra-high-strength steel. QP steel has a
medium yield strength ratio and high work hardening performance; and is suitable for body
frame parts and safety parts with relatively complex shapes and high strength requirements.
3.6 Dual Phase High Ductility steels (DH)
The microstructure of the steel is mainly composed of ferrite, martensite and a small amount of
retained austenite and bainite. Compared with DP steel of the same strength level, it provides
continuous work hardening ability through TRIP action, obtains better formability; and is
suitable for forming parts with higher drawing requirements.
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.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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