Standard No.:	Q/BQB 310-2018
English Name:	Continuously hot-rolled steel sheet and strip for automobile structural use
Chinese Name:	汽车结构用热连轧钢板及钢带
Professional Classification:	Q/
Issued on:	2018-1-5
Implemented on:	2018-4-10
Status:	valid
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the dimension, shape, technical requirements, inspection and testing, as well as package, mark and inspection documents of continuously hot-rolled steel sheet and strip for automobile structural use. This standard is applicable to the continuously hot-rolled steel strip of carbon and micro-alloyed steel with good cold-forming performance produced by Baoshan iron and steel Co., Ltd., as well as the steel sheet cut horizontally and the slit wide strip cut vertically therefrom, hereinafter referred to as steel sheet and strip. The products are used for the manufacturing of automobile girders, crossbeams, roll-forming wheels, automobile transmission shaft pipes, automobile axle housings and other structures. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 222-2006 Permissible tolerances for chemical composition of steel products GB/T 223 Methods for chemical analysis of iron, steel and alloy GB/T 228.1 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 & expression and judgment 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 Q/BQB 300 General rules of package, mark and inspection document for continuously hot rolled steel sheet and strip Q/BQB 301 Dimension, shape, weight and tolerance for continuously hot rolled steel sheet and strip 3 Classification and code 3.1 The designation, nominal thickness and application of steel sheet and strip are shown in Table 1. 3.2 Steel sheet and strip classification by surface treatment method: Pickled surface Rolled surface 3.3 Steel sheet and strip classification by surface quality classes: General grade surface FA Superior grade surface FB 3.4 Steel sheet and strip classification by product category: Hot-rolled steel strip Hot-rolled steel sheet Hot-rolled flat steel strip Hot-rolled slit wide steel strip Hot-rolled pickled steel strip Hot-rolled pickled steel sheet

Foreword i 1 Scope 2 Normative references 3 Classification and code 4 Information necessary for ordering 5 Dimension, shape, weight and tolerance 6 Technical requirements 7 Inspection and test 8 Packaging, marking and inspection documents 9 Rules of rounding off 10 Annex Annex A (Informative) Tables on comparison between similar designations in this standard and relevant standards

*GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
*GB/T 223-1994
*GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1 : Method of test at room temperature
*GB/T 232-2010 Metallic materials—Bend test
*GB/T 2975-2018 Steel and steel products—Location and preparation of samples and test pieces for mechanical testing
*GB/T 4336-2016/XG1-2017 Carbon and low-alloy steel―Determination of multi-element contents―Spark discharge atomic emission spectrometric method (routine method), including Amendment 1
*GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values
*GB/T 20066-2006 Steel and Iron-Sampling and Preparation of Samples for the Determination of Chemical Composition
*GB/T 20123-2006 Steel and iron—Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method)
*GB/T 20125-2006 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method