Q/BQB 360-2023 PDF English
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Q/BQB 360-2023: PDF in English (QBQB 360-2023) Q/BQB 360-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 360-2019
Continuously Hot-Rolled Special Steel Sheet and Strip
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 ... 6
5 Information Required for Ordering ... 7
6 Dimensions, Appearance, Weight and Allowable Deviations ... 8
7 Technical Requirements ... 8
8 Inspection and Test ... 14
9 Packaging, Marking and Inspection Documents ... 15
10 Numerical Rounding Rules ... 15
11 Appendix... 16
Appendix A (Informative) Recommended Quenching Temperatures and Corresponding
Quenching Hardness of Some Designations under Different Cooling Media ... 17
Appendix B (Informative) Comparison Table of Similar Designations in this Document
and Relevant Standards ... 19
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 10132-4:2003, EN 10083-2:2006, EN
10084:2008, EN 10089:2003, JIS G 4051:2016/AMENDMENT 1:2018, JIS G
4053:2016/AMENDMENT 1:2018, JIS G 4801:2021, JIS G 4401:2022 and GB/T 3077-2015
as well as in combination with actual productions situation of the Baoshan Iron and Steel Co.,
Ltd.
This Document replaced Q/BQB 360-2019 Continuously Hot-Rolled Special Steel Sheet and
Strip. Compared with Q/BQB 360-2019, the major technical changes are as follows besides the
structural adjustments and editorial modifications:
--- Add the year number of GB/T 228.1 to the Normative References;
--- Add Clause 3 "Terms and Definitions";
--- Delete the provisions on the maximum thickness of hot-rolled pickled surface steel sheets
and strips in Table 1;
--- Add a total of 14 designations and corresponding requirements, such as 30, 35, 45, 50,
SK85 (SK5), SK95 (SK4), SAE1065, SAE1078, C75S, C60E, SAE5120H, 65Mn-Cr,
50CrV (50CrVA), and 80CrV2 (8CrV);
--- Add Cr provisions for 40CrMn;
--- Change the C and Mn provisions of 50Mn2V;
--- Change the Appendixes A and B.
The Appendixes A and B of this Document are informative.
This Document was proposed by Manufacturing and Management Department of Baoshan
Irona and Steel Co., Ltd.
This Document shall be under the jurisdiction of Manufacturing and Management Department
of Baoshan Irona and Steel Co., Ltd.
This Documents was drafted by Manufacturing and Management Department of Baoshan Irona
and Steel Co., Ltd.
Chief drafting staff of this Document: Huang Jinghua.
Continuously Hot-Rolled Special Steel Sheet and Strip
1 Scope
This Document stipulates the size, shape, technical requirements, inspection and testing,
packaging, marking and inspection documents of continuously hot-rolled special steel sheet
and strip.
This Document applies to the continuously hot-rolled special steel strips with a maximum
thickness of no more than 20mm produced by Baoshan Iron and Steel Co., Ltd. and the steel
sheets cross-cut therefrom, hereinafter referred to as steel sheet and steel strip. The products are
mainly used to manufacture saw blade substrates, engineering machinery, parts in automobiles
and other fields after further processing and heat treatment.
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 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223 Analytical methods for chemical composition of iron, steel and alloys
(applicable parts)
GB/T 224 Determination of the depth of decarburization of steels
GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1: Method of test at room
temperature
GB/T 230.1 Metallic Rockwell hardness test - Part 1: Test method (scales A, B, C, D, E, F,
G, H, K, N, T)
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for
Mechanical Testing
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric
Analysis of Carbon and Low-Alloy Steel (Routine Method)
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 6394 Metal-methods for estimating the average grain size
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of
limiting values
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic
Method Using Standards Diagrams
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13299-1991 Steel - Determination of Microstructure
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
Q/BQB 300 General rules of package, mark and inspection document for continuously hot
rolled steel sheet and strip
Q/BQB 301 Hot-rolled steel sheets and strips – Dimensions, shape, weight and tolerances
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions apply.
4 Classification and Code
4.1 The designations, product categories of steel sheets and strips can refer to Table 1.
4.2 According to surface treatment methods, it can be divided into the following:
a) Pickled surface;
b) Rolled surface.
4.3 According to the surface quality level, it can be divided into the following:
a) Ordinary surface, FA;
b) Advanced surface, FB.
quality level and whether they are coated or not are not specified, they shall be delivered by a
trimmed state, a higher-level surface and oiled state. If the inner diameter of the steel coil is not
specified, it shall be delivered with an inner diameter of 610mm.
6 Dimensions, Appearance, Weight and Allowable Deviations
6.1 The allowable roughness values for carbon steel and all alloy steels with a specified average
C content of greater than or equal to 0.40% shall be determined through negotiation between
the supplier and the purchaser.
6.2 Other dimensions, appearances, weights and allowable deviations of steel sheets and strips
shall be in accordance with the provisions of Q/BQB 301. The allowable deviation of thickness
shall comply with the provisions of Table 3 in Q/BQB301. For carbon with an average C content
of less than 0.40%, the allowable steel roughness value is in accordance with the provisions
with the minimum yield strength greater than 300MPa and no greater than 420MPa.
6.3 If the user has higher requirements for thickness accuracy, the user can choose the advanced
precision PT.C with a minimum yield strength Re specified in Table 4 of Q/BQB 301 of no less
than 360MPa when ordering.
7 Technical Requirements
7.1 Designation and chemical composition
7.1.1 The designation and chemical composition (smelting analysis) of steel shall comply with
the requirements in Tables 2 to 3.
7.1.2 The analytical values of the corresponding chemical elements specified in Tables 2 ~ 3
shall be reported in the quality certificate. If the user requires reporting of analytical values of
other chemical elements, it needs to be negotiated and agreed upon by both parties and specified
in the contract.
7.1.3 The allowable deviation of the chemical composition of finished steel sheets and strips
shall comply with the provisions of GB/T 222.
7.3 Delivery status
Steel sheets and strips are delivered in hot-rolled or controlled-rolled condition. If required by
the purchaser, the product can be delivered in an annealed state after negotiation between the
supplier and the purchaser and noted in the contract.
7.4 Surface treatment methods
7.4.1 The surface treatment methods of steel sheets and strips can take two methods, such as
rolled surface and pickled surface.
7.4.2 When steel sheets and strips have hot-rolled pickled surfaces, they are usually supplied
with oil. The oil film shall be removable with alkali aqueous solution. Under normal packaging,
transportation, loading and unloading and storage conditions, the supplier shall ensure that it is
manufactured within 3 months from the date of completion, and the surface of the steel sheet
and strip shall not rust. After negotiation between the supplier and the purchaser, and indicating
in the contract, the hot-rolled pickled surface can also be supplied without oiling.
NOTE: For non-oiled products required by the purchaser, rust may occur, and the surface may be slightly
scratched during transportation, loading, unloading, storage and use.
7.5 Recommended quenching temperatures and corresponding quenching hardness
When the steel sheets and strips supplied according to this Document are used, the
recommended quenching temperatures and corresponding quenching hardnesses of some
designations under different cooling media are listed in Appendix A (informative).
7.6 Surface quality
7.6.1 The surface of steel sheets and strips shall not have bubbles, cracks, scars, pull cracks,
folds, inclusions and other defects that are harmful to use. The steel sheets and strips shall not
have delamination. The steel sheets and strips with pickled surfaces shall not have any parking
spots.
7.6.2 Steel sheets and strips are divided into two levels according to surface quality, as shown
in Table 4.
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, but the defective part shall not exceed 5% of
the total length of each coil.
8.5 Sampling frequency
8.5.1 Sampling frequency for chemical composition analysis
Smelting analysis of chemical composition by furnace.
8.5.2 Sampling frequency of other items
When other items are inspected according to contract requirements, they should be carried out
in batches, and the composition of the inspection batch shall be agreed upon when ordering.
8.6 Reinspection
8.6.1 If a certain test result does not meet the standard requirements, double the number of
specimens will be taken from the same batch for reinspecting the unqualified item.
8.6.2 If the reinspection results (including all indicators required for the test of the item) are
qualified, the entire batch shall be qualified. If even one indicator of the reinspection results
(including all indicators required for the test of the item) fails, the reinspection shall be
unqualified.
8.6.3 If the reinspection is unqualified, the individual pieces that have been tested and have
unsatisfactory test results cannot be accepted, but the single pieces of the batch of materials that
have not been tested can be resubmitted for testing and acceptance one by one.
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 300.
10 Numerical Rounding Rules
The numerical judgment adopts the rounding value comparison method, and the numerical
rounding shall comply with the provisions of GB/T 8170.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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