This standard specifies the definition, classification, code, dimension, appearance, weight, permissible deviation, technical requirements, test methods, inspection rules, packing, marking and inspection certificate of continuous hot-dip zinc-coated steel sheets and strips (hereinafter referred to as steel sheets and strips).
This standard is applicable to continuous hot-dip zinc-coated steel sheets and strips of general, mechanical splicing, drawing (03, 04, 05 and 06) and structural qualities.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending error in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 222-1984 Method of Sampling Steel for Determination of Chemical Composition and Permissible Variations for Product Analysis
GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892: 1998)
GB/T 232 Metallic materials - Bend Test (GB/T 232-1999, eqv ISO 7438: 1985)
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel Plates (Sheets) and Strips
GB/T 708 Dimension Shape Weight and Tolerance for Cold-rolled Steel Plates and Sheets
GB/T 709 Dimension, Shape, Weight and Tolerances for Hot-rolled Steel Plates and Sheets
GB/T 1839-93 Steel Product Zinc Coating Mass Testing Method (GB/T 1839-1993, neq ISO 1460: 1973)
GB/T 2975 Steel and Steel Products- Location and Preparation of Test Pieces for Mechanical Testing (GB/T 2975-1998, eqv ISO 377: 1997)
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 5027-1999, eqv ISO 10113: 1991)
GB/T 5028 Metallic Materials-Sheet and Strip-Determination of Tensile Strain Hardening Exponent (n-values) (GB/T 5028-1999, eqv ISO 10275: 1993)
GB/T 8170 Rules for Rounding off of Numerical Values
GB/T 17505 Steel and Steel Products: General Technical Delivery Requirements (GB/T 17505-1998, eqv ISO 404: 1992)
3 Terms and Definitions
3.1
Continuous hot-dip zinc-coated steel sheets and strips
They are the zinc-coated steel sheets and strips obtained by immerging cold-rolled steel strips or hot-rolled acid-washed steel strips into plating solution with zinc content (mass fraction) not less than 98% for hot dip coating on the continuous production line.
3.2
Spangle coating
The coating with obvious spangles formed due to free growth of zinc grains during the normal freezing process of zinc coating.
