1 Scope
This standard specifies designation, order information, dimensions, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of steel plates for building structure.
This standard applies to 6 mm to 200 mm-thick Q345GJ, 6 mm to 150 mm-thick Q235GJ, Q390GJ, Q420GJ and Q460GJ, and 12 mm to 40 mm-thick Q500GJ, Q550GJ, Q620GJ and Q690GJ hot-rolled steel plate (hereinafter referred to as “steel plate”) for high-rise building structures, large-span structures and other important building structures.
This standard may also apply to hot-rolled steel strips.
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 Permissible tolerances for chemical composition of steel products
GB/T 223.5 Steel and iron—Determination of acid-soluble silicon and total silicon content—Reduced molybdo-silicate spectrophotometric method
GB/T 223.9 Iron, steel and alloy—Determination of aluminum content—Chrome azurol S photometric method
GB/T 223.11 Iron steel and alloy—Determination of chromium content—Visual titration or potentiometric titration method
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy—The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy—The neocuproine-chloroform extraction photometric method for the determination of copper content
GB/T 223.23 Iron, steel and alloy—Determination of nickel content—The dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy—Determination of molybdenum content—The thiocyanate spectrophotometric method
GB/T 223.40 Iron, steel and alloy—Determination of niobium content by the sulphochlorophenol S spectrophotometric method
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy—The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy—The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy—Curcumin spectrophotometric method for the determination of boron content
GB/T 223.79 Iron and steel—Determination of multi-element contents—X-ray fluorescence spectrometry (Routine method)
GB/T 223.81 Iron, steel and alloy—Determination of total aluminum and total aluminum and total boron contents—Microwave digestion-inductively coupled plasma mass spectrometric method
Foreword i
1 Scope
2 Normative references
3 Designation representation
4 Order information
5 Dimensions, shape, weight and tolerances
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
10 Rounding off of numerical values
