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Q/BQB 311-2023 English PDF (QBQB311-2023)

Q/BQB 311-2023 English PDF (QBQB311-2023)

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Q/BQB 311-2023: Continuously hot-rolled high yield strength steel sheet and strip for cold forming

This document specifies the dimension, shape, technical requirements, inspection and testing, packaging, marking, and inspection documents for continuously hot-rolled high-yield strength steel sheets and strips for cold forming. This document applies to continuously hot-rolled high-yield strength steel strips for cold forming produced by Baoshan Iron and Steel Co., Ltd., as well as steel sheets cut transversely and steel strips slit longitudinally from it, hereafter referred to as steel sheets and steel strips.
Q/BQB 311-2023
BQB
ENTERPRISE STANDARD OF BAOSTEEL CO., LTD.
Replacing Q/BQB 311-2018
Continuously hot-rolled high yield strength steel sheet and
strip for cold forming
ISSUED ON: APRIL 9, 2023
IMPLEMENTED ON: JULY 1, 2023
Issued by: BaoSteel Co., Ltd.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Categories and codes ... 5
5 Information required for ordering ... 6
6 Dimensions, shape, weight and tolerances ... 6
7 Technical requirements ... 7
8 Inspection and testing ... 9
9 Packaging, marking, and inspection documents ... 11
10 Rounding-off rules for numerical values ... 11
11 Appendix ... 11
Appendix A (informative) Comparison table of similar grades between this document and relevant standards ... 12
Continuously hot-rolled high yield strength steel sheet and
strip for cold forming
1 Scope
This document specifies the dimension, shape, technical requirements, inspection and testing, packaging, marking, and inspection documents for continuously hot-rolled high-yield strength steel sheets and strips for cold forming.
This document applies to continuously hot-rolled high-yield strength steel strips for cold forming produced by Baoshan Iron and Steel Co., Ltd., as well as steel sheets cut transversely and steel strips slit longitudinally from it, hereafter referred to as steel sheets and steel strips.
2 Normative references
The following documents contain the provisions which, through normative reference in this document, constitute the essential provisions of this document. For the dated referenced documents, only the versions with the indicated dates are applicable to this document; for the undated referenced 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 Methods for chemical analysis of iron, steel and alloy (applicable parts) 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 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 8170 Rules of rounding off for numerical values and expression and judgment of limiting values
GB/T 20066 Steel and iron - Sampling and preparation of samples for the 5 Information required for ordering
5.1 Users need to provide the following information when ordering:
a) This document number;
b) Product category;
c) Grade, surface treatment method, and surface quality level;
d) Specifications and precision of dimensions (thickness, width, unevenness); e) Edge state;
f) Purpose;
g) Type of inspection documents.
5.2 Matters omitted from the order contract
5.2.1 If the surface treatment method is not specified, the product will be delivered with the rolled surface.
5.2.2 For hot-rolled steel sheets and steel strips, if the dimensional precision is not specified, they will be delivered with the ordinary precision specified in Q/BQB 301; if the edge status is not specified, the steel strips will be delivered in an untrimmed state, and the steel sheets will be delivered in a trimmed state.
5.2.3 For hot-rolled pickled steel sheets and steel strips, if the dimensional precision is not specified, the thickness shall be high thickness precision and other dimensions shall be ordinary precision for delivery; if the edge condition, surface quality level, and whether it is oiled or not is not specified, they shall be delivered with trimmed edges, higher-grade and oiled surface; if the inner diameter of the steel coil is not specified, the inner diameter of the steel coil shall be 610 mm for delivery.
6 Dimensions, shape, weight and tolerances
The dimensions, shape, weight, and tolerances for steel sheets and steel strips shall comply with the regulations of Q/BQB 301. If the buyer has higher requirements for thickness precision, the high precision PT.C given in Table 4 of Q/BQB 301 can be selected when ordering.
7 Technical requirements
7.1 Grade and chemical composition
7.1.1 The grade and chemical composition (smelting analysis) of steel shall comply with the requirements in Table 2.
7.1.2 The permissible tolerances of the chemical composition of finished steel sheets and steel strips shall comply with the provisions of GB/T 222.
7.2 Smelting method
The steel used for steel sheets and steel strips is killed steel smelted in an oxygen converter.
7.3 Delivery status
The steel sheets and steel strips are delivered in a hot-rolled or controlled-rolled state. 7.4 Surface treatment methods
7.4.1 The surface treatment methods of steel sheets and steel strips can be rolling and acid pickling.
7.4.2 When steel sheets and steel strips have hot-rolled pickled surfaces, they are usually supplied with oiling. The oil film shall be able to be removable with an aqueous alkali solution. Under normal packaging, transportation, loading and unloading, and storage conditions, the supplier shall ensure that the surface of the steel sheet and steel strip will not rust within 3 months from the date of manufacturing completion. After negotiation between the supplier and the buyer, and indication in the contract, the hot- rolled pickled surface products can also be supplied without oiling.
NOTE: For non-oiled products required by the buyer, rust may occur; the surface may be slightly scratched during transportation, loading, unloading, storage, and use.

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