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Annex A of this standard is normative.
This standard was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of National Technical Committee on Iron and Steel of Standardization Administration of China.
Continuously hot-dip zinc (aluminum-zinc) coated steel sheet and strip with restricted hazardous substance
1 Scope
This standard specifies the terms, classification and code, order details, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of continuously hot-dip zinc (aluminum-zinc) coated steel sheet and strip with restricted hazardous substance.
This standard is applicable to continuously hot-dip zinc (aluminum-zinc) coated steel sheet and strip with restricted hazardous substance with a width of not less than 600 mm and a nominal thickness of 0.35 mm to 3.00 mm.
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 molybdosilicate spectrophotometric method
GB/T 223.9 Iron, steel and alloy - Determination of aluminium content - Chrom azurol S photometric method
GB/T 223.10 Methods for chemical analysis of iron, steel and alloy - The cupferron separation-chrome azurol S photometric method for the determination of aluminium content
GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The chromotropic acid photometric method for the determination of titanium content
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
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 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content
GB/T 228 Metallic materials - Tensile testing at ambient temperature
GB/T 232 Metallic materials - Bend test
GB/T 247 General rule of package, mark and certification for steel plates (sheets) and strips
GB/T 1839 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products
GB/T 2518 Continuously hot-dip zinc-coated steel sheet and strip
GB/T 2975 Steel and steel products - Location and preparation of samples and 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 5027 Metallic materials - Sheet and strip - Determination of plastic strain ratio (r-values)
GB/T 5028 Metallic Materials-Sheet and Strip-Determination of tensile strain hardening exponent( n-values)
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 17505 Steel and steel products - General technical delivery requirements
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
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 20126 Unalloyed steel - Determination of low carbon content - Part 2: Infrared absorption method after combustion in an induction furnace (with preheating)
YB/T 4217.1 Coatings of the hot dip galvanizing(zinc-aluminum) sheet - Determination of hexavalent Cr content - Spectrophotometric method
YB/T 4217.2 Coatings of the hot dip galvanizing(zinc-aluminum) sheet - Determination of Hg content - Atomic absorption spectrometric method
YB/T 4217.3 Coatings of the hot dip galvanizing(zinc-aluminum) sheet - Determination of Pb and Cd contents - Inductively coupled plasma atomic emission spectrometric method
3 Terms and definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
restricted hazardous substance
restricted hazardous substance refers to hazardous substance not exceeding a certain limit in the whole material that is uniform and cannot be separated mechanically, including lead, mercury, cadmium and hexavalent chromium
4 Classification and code
4.1 The steel sheet and strip shall be classified by designation and intended use as specified in Table 1.
Table 1 Classification of designation and purpose
Designation Intended use
Pure hot-dip zinc coated steel sheet and strip Hot-dip aluminum-zinc alloy steel sheet and strip
DX51D+Z DX51D+AZ For cold forming
DX52D+Z DX52D+AZ
DX53D+Z DX53D+AZ
DX54D+Z DX54D+AZ
DX56D+Z -
DX57D+Z -
S220GD+Z - For structure
S250GD+Z S250GD+AZ
S280GD+Z S280GD+AZ
S320GD+Z S320GD+AZ
S350GD+Z S350GD+AZ
S550GD+Z S550GD+AZ
4.2 The classification of steel sheet and strip by coating type, coating form, coating surface structure and treatment shall comply with the requirements in Table 2.
Table 2 Classification by coating type, coating form, coating surface structure and treatment
Classification item Category Code
Coating type Pure zinc coating Z
Aluminum-zinc alloy coating AZ
Expression of coating form Equal-thickness coating (g/m2) A
Differential-thickness coating (g/m2) B/C
Surface structure Pure zinc coating Mini spangle M
None spangle F
Aluminum-zinc alloy coating Common spangle N
Surface treatment Chromium-free passivation C5
Chromium-free self-lubricating SL5
Oiling O
Chromium-free passivation + oiling CO5
Treated with chromium-free anti-fingerprint film AF5
Un-treated U
Note: A is the sum of the weight of coating on inner and outer surfaces of the steel strip, B is the weight of coating on the upper surface of the steel strip, and C is the weight of coating on the lower surface of the steel strip, in g/m2.
4.3 Classification and code of coating type and coating weight
4.3.1 Classification and code of double-sided equal-thickness coating type and coating weight shall comply with Table 3. As agreed between the supplier and the purchaser, steel sheet and strip with coating weight not listed in Table 3 may also be supplied.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and code 5 Information for ordering 6 Dimensions, shape, weight and tolerances 7 Technical requirements 8 Test methods 9 Inspection rules 10 Packaging, marking and quality certificate 11 Rules of rounding off Annex A (Normative) Weight calculation method for theoretical weighing
ICS 77.140.50 H 46 YB 中华人民共和国黑色冶金行业标准 YB/T 4213—2010
限制有害物质连续热镀锌(铝锌) 钢板和钢带 Continuously hot-dip zinc (aluminum-zinc) coated steel sheet and strip with restricted hazardous substance
6.3 重量及允许偏差 6.3.1 钢板和钢带通常按实际重量计重交货。在合同中注明，钢板也可按理论重量计重交货。 6.3.2 钢板按理论重量交货时，其重量计算方法按附录A(规范性附录)的规定。 7 技术要求 7.1 化学成分 7.1.1 钢的牌号和化学成分(熔炼分析)应符合表14的规定。经供需双方商定，可以供应GB/T 2518、GB/T 14978中规定的其他牌号。钢的成品成分及允许偏差应符合GB/T 222的规定。 表14 钢的牌号(熔炼分析)和化学成分 牌号 化学成分a(质量分数)/％ C Si Mn P S Ti
a 无明显屈服时采用Rp0.2。 b 试样采用GB/T 228中的P6试样，试样方向为横向。 c 当产品公称厚度大于0.50mm，但小于等于0.70mm时，断后伸长率(A80)允许下降2％；当公称厚度不大于0.50mm时，断后伸长率(A80)允许下降4％。 d 当产品公称厚度大于1.50mm时，r90允许下降0.2。 e 屈服强度值仅适用于光整表面的钢板和钢带。
