Q/BQB 410-2023 PDF English
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Q/BQB 410-2023: PDF in English (QBQB 410-2023) Q/BQB 410-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 410-2019
Cold-Rolled Carbon Structural 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 ... 6
5 Information Required for Ordering ... 7
6 Dimensions, Shape, Weight and Allowable Deviations ... 7
7 Technical Requirements ... 8
8 Inspection and Testing ... 10
9 Packaging, Marking and Inspection Documents ... 11
10 Rounding-off Rules for Numerical Values ... 12
11 Similar Comparison of Designations ... 12
Appendix A (Informative) Comparison List of Similar Designations between this
Document and Relevant Domestic/Foreign Standards ... 13
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 DIN 1623:2009 and JFS A2001:2020.
This Document replaced Q/BQB 410-2019 Cold-rolled Carbon Structural Steel Sheet and Strip.
Compared with Q/BQB 410-2019, the major technical changes of this Document are as follows:
--- Revise the Normative References;
--- Revise the upper limit requirements of the Component-C of B240ZK and B280VK
designations in Table 4;
--- Revise the lower limit requirements of the Component-AL of the original designations
in Table 4;
--- Add the Designations Q235, Q275 and Q325 and related technical requirements;
--- Revise the tensile specimen provisions in Table 6, using the P17 specimen specified in
GB/T 228.1;
--- In 8.3 tensile test method, add the second-level rate requirement (original 7.3);
--- Revise Appendix A Comparison List of Approximate Designations of Relevant Domestic
and Foreign Standards;
--- Editorial modification of the document.
The Appendix A of this Document is informative.
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 410-1988, Q/BQB 410-1994, Q/BQB 410-1999, Q/BQB 410-2003, Q/BQB 410-2009.
Cold-Rolled Carbon Structural Steel Sheet and Strip
1 Scope
This Document specifies the terms and definitions, classification and code, size, shape, weight,
technical requirements, inspection and testing, packaging, marking and inspection documents
of cold-rolled carbon structural steel sheet and strip.
This Document applies to cold-rolled carbon structural steel sheet and strip (hereinafter referred
to as steel sheet and strip) with a thickness of 0.50mm ~ 3.5mm 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 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
4.3 The classification of steel sheet and strip according to the surface structure shall comply
with the provisions of Table 3.
5 Information Required for Ordering
5.1 When ordering, the user shall provide the following information:
a) Product name (steel sheet or strip);
b) Enterprise standard number of this Document;
c) Designation;
d) Order weight;
e) Product specifications and dimensions, roughness accuracy;
f) Edge state;
g) Surface quality level;
h) Oiling requirements;
i) Packaging method;
j) Purpose;
k) Others.
5.2 If the size, roughness accuracy, surface quality level, edge state and packaging method are
not specified in the ordering contract, this Standard product shall be supplied as trimmed steel
sheet or strip with ordinary size, roughness accuracy and Level-FB surface quality; and shall
be packaged in the packaging method provided by the supplier.
6 Dimensions, Shape, Weight and Allowable Deviations
The dimension, shape, weight and allowable deviations of steel sheet and strip shall comply
with the provisions of Q/BQB 401.
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) (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 Steel sheet and strip shall be inspected and accepted in batches. Each inspection batch shall
consist of steel sheet and strip of the same designation, specification and processing state of no
more than 30 tons. For steel strips weighing more than 30 tons, each steel coil shall constitute
an inspection batch.
8.5 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 9.
8.6 The supplier may use different inspection and test methods for acceptance testing. In case
of disputes, the inspection and test methods and relevant technical requirements specified in
this standard shall be used for testing.
8.7 Reinspection
For tensile test, if a test result does not meet the requirements of this Standard, double the
number of specimens from the same batch shall be randomly selected for reinspecting the
unqualified item. If the reinspection result (including all the indicators required by this test item)
is qualified, the entire batch shall be qualified. If even one indicator of the reinspection result
(including all the indicators required by this test item) is unqualified, the reinspection shall be
unqualified. If the reinspection is unqualified, the single workpiece that has been tested and has
unqualified test results cannot be accepted; but the single workpieces that have not been tested
in the batch of materials can be resubmitted for testing and acceptance piece by piece.
9 Packaging, Marking and Inspection Documents
The packaging, marking and inspection documents of steel sheet and strip shall comply with
the provisions of Q/BQB 400. If the purchaser has special requirements for packaging, it shall
be stated in the contract.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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