Q/BQB 408-2023 PDF English
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| Q/BQB 408-2023 | English | 480 |
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Low carbon cold-rolled steel sheet and strip for cold forming
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| Q/BQB 408-2021 | English | 155 |
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Low carbon cold-rolled steel sheet and strip for cold forming
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| Q/BQB 408-2019 | English | 165 |
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Cold formed low carbon steel sheet and strip for cold forming
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| Q/BQB 408-2018 | English | 130 |
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Cold formed low carbon steel sheet and strip for cold forming
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| Q/BQB 408-2014 | English | 85 |
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[Replaced by Q/BQB 408-2018] Cold formed low carbon steel sheet and strip for cold forming
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| Q/BQB 408-2009 | English | 249 |
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Cold rolled strip and strip for stamping
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Q/BQB 408-2023: Low carbon cold-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/QBQB408-2023
BQB
ENTERPRISE STANDARD OF BAOSTEEL CO., LTD.
Replacing Q/BQB 408-2021
Low carbon cold-rolled steel sheet and strip for cold forming
Issued on: APRIL 09, 2023
Implemented on: JULY 01, 2023
Issued by. BaoSteel Co., Ltd.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Classification and code... 6
5 Information required for ordering... 7
6 Dimensions, appearance, weight, allowable deviations... 8
7 Technical requirements... 8
8 Inspection and testing... 13
9 Packaging, marking, inspection documents... 15
10 Numerical rounding rules... 15
11 Comparison of similar designations... 15
Appendix A (Normative) Hard material... 16
Appendix B (Informative) Hardness reference value of SPCC-X series specific
designation... 19
Appendix C (Informative) Comparison of similar designations between this document
and relevant domestic and foreign standards... 20
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document was prepared with reference to JIS G 3141.2021, EN 10130.2006, JFS
A 2001.2014.
This document replaces Q/BQB 408-2021 "Low carbon cold-rolled steel sheet and strip
for cold forming".
Compared with Q/BQB 408-2021, the main technical changes in this document are as
follows.
- MODIFY normative references;
- ADD the definition of type code for SPCC designation tempering degree (Table 4);
- MODIFY the composition requirements of Mn and S for SPCC series designation,
as well as the composition requirements for Mn, P, S for SPCD and SPCE series
designation, in Table 5;
- MODIFY the composition requirements of Mn, P, S of DC01 designation, as well
as the composition requirements of P and S of DC03 and DC04 designation, in
Table 6;
- MODIFY the composition requirements of Mn, P, S of BLC designation, as well
as the composition requirements of P and S of BLD and BUSD designations, in
Table 7;
- DELETE the composition requirements for Al in Table 5, Table 6, Table 7;
- MODIFY the provisions for tensile specimens in Tables 8, 9, 11, uniformly
adopting the P17 specimens specified in GB/T 228.1;
- In Table 10, ADD the requirement that when the product thickness is > 2.3 mm ~
2.5 mm, the r90 value is allowed to be reduced by 0.4;
- In Table 14, SUPPLEMENT the description of the scope of application of surface
structure;
- In the tensile test method 8.3, ADD the second-level rate requirement (original 7.3);
- CHANGE the statement of 8.4 "Description of r-value and n-value detection
methods" (original 7.4);
- REVISE the Appendix C -- Comparison similar designations among relevant
domestic and foreign standards;
- MAKE editorial changes to documents.
Appendix A of this document is a normative appendix. Appendices B and C are
informative appendixes.
This document was proposed by the Manufacturing Management Department of
Baoshan Iron and Steel Co., Ltd.
This document shall be under the jurisdiction of the Manufacturing Management
Department of Baoshan Iron and Steel Co., Ltd.
This document is drafted by the Manufacturing Management Department of Baoshan
Iron and Steel Co., Ltd.
The main drafter of this document. Yuan Min.
This standard replaces the standard previously issued as follows.
Q/BQB 408-1988, Q/BQB 408-1994, Q/BQB 408-1999, Q/BQB 408-2003, Q/BQB
408-2009, Q/BQB 408-2014, Q/BQB 408-2018, Q/BQB 408-2019, Q/BQB 408-2021.
Low carbon cold-rolled steel sheet and strip for cold forming
1 Scope
This document stipulates the classification and code, size, shape, weight, technical
requirements, inspection and testing, packaging, marking and inspection documents of
low carbon cold-rolled steel sheet and strip for cold forming.
This document applies to low carbon cold-rolled steel sheet and strip for cold forming
(hereinafter referred to as steel plates and strips), which have a thickness of 0.17 mm ~
3.5 mm, as produced by Baoshan Iron & Steel Co., Ltd.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Chemical analysis methods for steel and alloys
GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1.Method of test at room
temperature
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1.Test method
GB/T 232 Metallic materials - Bend test
GB/T 2523 Measuring method of surface roughness, peak count and waviness for
cold-rolled metal sheet and strip
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 4340.1 Metallic materials - Vickers hardness test - Part 1.Test method
GB/T 5027 Metallic materials - Sheet and strip - Determination of plastic strain ratio
GB/T 5028 Metallic materials - Sheet and strip - Determination of tensile strain
hardening exponent
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 Package, mark and inspection document for cold-rolled product
Q/BQB 401 Dimension, shape, weight and tolerances for cold-rolled steel sheet and
strip
3 Terms and definitions
There are no terms or definitions to be defined in this document.
4 Classification and code
4.1 Steel sheets and strips shall comply with the requirements in Table 1, when divided
according to their uses.
4.2 Steel sheets and strips shall comply with the requirements in Table 2, when divided
according to surface quality.
4.3 Steel sheets and strips shall comply with the requirements in Table 3, when divided
according to surface structure.
4.4 Codes for distinguishing types of tempering degrees of steel sheets and strips with
SPCC designation.
5 Information required for ordering
5.1 Users shall provide the following information when ordering.
a) Product name (steel sheet or steel strip);
b) Enterprise standard number of this document;
c) Designation;
d) Product specifications, dimensions, unevenness precision;
e) Edge state;
f) Surface structure;
g) Surface quality grade;
h) Greasing requirements;
i) Packaging method;
j) Purpose;
k) Others.
5.2 If the size and unevenness precision, surface structure, surface quality grade, edge
state, packaging method are not specified in the order contract, the product in this
document shall be supplied in trimmed steel strips or trimmed steel plates, based on the
ordinary size and unevenness precision, surface structure of pitted surface, surface
quality FB, meanwhile packaged according to the packaging method provided by the
supplier.
6 Dimensions, appearance, weight, allowable deviations
The dimension, shape, weight, allowable deviations of steel sheets and strips shall
comply with the provisions of Q/BQB 401.The thickness and unevenness allowable
deviations of SPCC designation shall comply with the corresponding provisions, when
the minimum yield strength specified in Q/BQB 401 is < 260 MPa.
7 Technical requirements
7.1 Chemical composition
7.1.1 The chemical composition (smelting analysis) of steel shall comply with the
provisions of Table 5, Table 6, Table 7.
7.1.2 The allowable deviation of the chemical composition of finished steel sheets and
strips shall comply with the provisions of GB/T 222.
7.2 Smelting methods
The steel used for steel sheets and strips is smelted in an oxygen converter.
7.3 Delivery state
7.3.1 Steel sheets and strips are usually delivered after cold rolling, annealing, leveling.
7.3.2 Steel sheets and strips are usually supplied with grease; the grease film shall be
removable with alkali aqueous solution. Under normal packaging, transportation,
loading and unloading, storage conditions, the supplier shall ensure that the surface of
the steel sheets and strips will not rust within 6 months from the date of completion of
manufacturing. According to the requirements of the purchaser, the product can also be
supplied without greasing, after agreement between the supplier and the buyer and
being specified in the contract. The supplier will not bear corresponding product quality
responsibility for defects such as rust, scratches, friction marks, which are caused by
ungreased products during handling, storage, and use.
Note. The issuance date in the product inspection document is usually specified as the
manufacturing completion date of the product.
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 Table 8, Table 9, Table 10, Table 11.Steel sheets and strips with
designation DC01 shall comply with the requirements of Note d in Table 10.
7.4.2 When steel sheets and strips are supplied as specified parts, the supplier and the
buyer can agree on a mechanical property range, that meets the processing requirements
of the parts, as the acceptance criterion. At this time, the mechanical properties specified
in Table 8, Table 9, Table 10, Table 11 will no longer be the basis for delivery.
7.4.3 Due to the influence of aging, the mechanical properties of steel sheets and strips
will deteriorate with the extension of storage time, such as the increase in yield strength
and tensile strength, the decrease in elongation at break, the deterioration of formability,
the occurrence of tensile strain marks, etc., it is recommended that users use it as soon
as possible.
7.4.4 The hardness and performance requirements for hard materials with the
designation SPCC shall be as specified in Appendix A.
7.5 Tensile strain marks
Under room temperature storage conditions, for steel sheets and strips with surface
quality grades of FC and FD, tensile strain marks shall comply with the requirements
in Table 12.
7.6 Surface quality
7.6.1 The surface of steel sheets and strips shall not have holes, surface cracks,
laminations, or other defects that are harmful to use.
7.6.2 The characteristics of each surface quality grade of steel sheets and strips shall
comply with the provisions of Table 13.
7.6.3 For steel strips, since there is no opportunity to cut off the defective part of the
strip, the steel strip is allowed to be delivered with defects; however, the defective part
shall not exceed 3% of the total length of each roll. If the user has special requirements,
they can be determined through negotiation when ordering.
7.7 Surface structure
7.7.1 The average surface roughness of steel sheets and strips shall be controlled in
accordance with the requirements of Table 14.If the purchaser has special requirements
for roughness, these shall be negotiated when ordering.
7.7.2 Surface structure suitable for environmentally friendly coating (BAOTEXTM)
BAOTEXTM products can meet the technical requirements of advanced
environmentally friendly coating processes. If users have needs, they can be negotiated
when ordering.
8 Inspection and testing
8.1 The appearance of steel sheets and strips shall be visually inspected.
8.2 The size and shape of steel sheets and strips shall be measured, using appropriate
measuring tools.
8.3 The tensile test shall be 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. The beam displacement rate for determining
the yield strength is 0.00083 × Lc (mm/s) (where Lc is the parallel length of the tensile
specimen, in mm, the same below) or 0.05 × Lc (mm/min). After the yield strength is
measured, the beam displacement rate is 0.0067 × Lc (mm/s) or 0.4 × Lc (mm/min).
8.4 The r value is calculated at 15% plastic strain. When the maximum force plastic
elongation Ag is less than 15%, the value of the plastic strain at the end of Ag is
calculated. The n value is calculated in the range of 10% ~ 20% plastic strain. When Ag
is less than 20%, the calculated strain range is 10% to Ag.
8.5 Steel sheets and strips shall be inspected and accepted in batches. Each inspection
batch shall be composed of steel sheets and strips of the same designation, specification,
processing state, at not exceeding 30 tons. For steel strips weighing more than 30 tons,
each coil forms an inspection lot.
8.6 The inspection items, number of samples, sampling methods, test methods for each
batch of steel sheets and strips shall comply with the provisions of Table 15.
8.7 The supplier may use different inspection and test methods for acceptance testing.
In the event of a dispute, it shall use the inspection and test methods and relevant
technical requirements specified in this document for testing.
8.8 Reinspection
For tensile test, strain hardening index (n value), plastic strain ratio (r value), Rockwell
hardness or Vickers hardness, bending test, if any test result does not meet the
requirements of this document, it shall take double quantity of specimens randomly
from the same batch, to carry out reinspection for this unqualified item. If the re-
inspection results (including all indicators required for the test of item) are qualified,
the whole batch will be qualified. If even one index in the reinspection results (including
all indicators required for the test of the item) fails, the reinspection will fail. If the re-
inspection fails, the individual pieces that have been tested and have inconsistent test
results cannot be accepted; however, the individual pieces in the batch of materials that
have not been tested can be resubmitted for testing and acceptance one by one.
9 Packaging, marking, inspection documents
The packaging, marking, inspection documents of steel sheets and strips shall comply
with the requirements of Q/BQB 400.If the purchaser has special requirements for
packaging weight, these shall be noted in the contract.
10 Numerical rounding rules
The numerical judgment adopts the rounding value comparison method; the numerical
rounding shall comply with the provisions of GB/T 8170.
11 Comparison of similar designations
See Appendix C for a comparison of similar designations between this document and
relevant domestic and foreign standards.
Appendix A
(Normative)
Hard material
A.1 For steel sheets and strips with the designation SPCC, hard steel sheet and steel
strip materials (hereinafter referred to as hard materials) can be provided, according to
different tempering requirements.
A.2 The distinguishing of tempering degree of hard materials shall comply with the
provisions of Table A.1.
A.3 The chemical composition of hard materials is determined by the supplier.
A.4 Hardness of hard materials
A.4.1 If hard materials are ordered according to the tempering degree of 1/8 hard, 1/4
hard, hard, their Rockwell hardness (HRBS or HRBW) or Vickers hardness (HV)) shall
comply with the provisions of Table A.2.Unless otherwise specified, the supplier only
reports the measured value of Rockwell hardness.
A.4.2 For thin hard materials, such as Rockwell hardness (HRB) cannot be tested, the
surface hardness of the hard material can be tested by Rockwell hardness (HR30T or
HR15T) or Vickers hardness (HV); then converted to HRB according to the provisions
of Table A.3, Table A.4, Table A.5 of Appendix A.
A.4.3 Examples of the minimum measured thickness of hard materials corresponding
to Rockwell hardness (HRB) can be found in Table A.6.
A.4.4 When measuring HR30T or HR15T, a diamond anvil shall be used; indentations
are allowed on the back of the hard material specimen.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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