Standard No.:	JG/T 380-2012
English Name:	Cold-formed Thin-wall Steel Sections for Building Structures
Chinese Name:	建筑结构用冷弯薄壁型钢
Professional Classification:	JG    Professional Standard - Building
Source Content Issued by:	MOC
Issued on:	2012-5-3
Implemented on:	2012-10-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	8000 words
Translation Price(USD):	200.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the terminologies and definitions, classification and marking, materials, requirements, test methods, inspection rules, ordering details, marking and packaging as well as quality certificate of cold-formed thin-wall steel sections for building structures. This standard is applicable to the cold-formed thin-wall open sectional steel for industrial and civil buildings and structures. 2 Normative References The following documents for the application of this document are essential. For dated references, only the edition cited applies. For undated references, the latest editions (including all the amendments) are applicable. GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature GB/T 700 Carbon Structural Steels GB/T 1591 High Strength Low Alloy Structural Steels GB/T 2101 General Requirement of Acceptance Packaging, Marking and Certification for Section Steel GB/T 2518 Continuous Hot-dip Zinc-coated Steel Sheets and Strips GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing GB/T 4171 Atmospheric Corrosion Resisting Structural Steel GB/T 6723 Cold Forming Sectional Steel - Open Sectional Steel for General Structure - Dimensions Shape Weight and Permissible Tolerances GB/T 6725 Cold Forming Steel Sections GB/T 14978 Continuously Hot-dip Aluminum-zinc Alloy Coated Steel Sheet and Strip CB/T 17505 Steel and Steel Products - General Technical Delivery Requirements 3 Terminologies and Definitions For the purpose of this document, the following terminologies and definitions apply. 3.1 Cold-formed thin-wall open sectional steel Thin-wall steel sections with groove-shaped or angular openings, which are made through cold forming by processing the cold-rolled or hot-rolled steel strip with thickness no larger than 6 mm on the continuous roller type cold forming units. 3.2 Concavo-convex The dimensions of the parts sinking or raising along the direction perpendicular to the same surface of the cold-formed thin-wall steel section. 3.3 Curving The maximum vector height of the cold-formed thin-wall steel section curved along the length direction. 3.4 Twisting The maximum clearance height formed between the horizontal plane and the lower edge of one end of the cold-formed thin-wall steel section due to the twisting when the steel section surface along the length direction is placed on the horizontal plane with the lower edge of the other end appressed to the horizontal plane. 4 Classification and Marking 4.1 Classification As shown in Figure A.1, the section shape of the cold-formed thin-wall open sectional steel in this standard are classified into 6 kinds, the codes of which are as follows: a) Cold-formed equal angle steel, code-named JL-JD; b) Cold-formed unequal angle steel, code-named JL-JB; c) Cold-formed equilateral flanging angle steel, code-named JL-JJ;

Foreword i 1 Scope 2 Normative References 3 Terminologies and Definitions 4 Classification and Marking 5 Materials 6 Requirements 7 Test Method 8 Inspection Rules 9 Order Details 10 Marking, Packing and Quality Certificate Appendix A (Normative) Specifications and Section Characteristics of Cold-formed Thin-wall Open Sectional Steel