Galvanized steel sheet

Product Standard

Domestic Standard: Primarily follows GB/T 2518-2019 "Continuous Hot-Dip Galvanized Thin Steel Sheets and Steel Strips." This standard specifies the classification, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking, and certificate of quality for continuous hot-dip galvanized thin steel sheets and steel strips, applicable to continuous hot-dip galvanized thin steel sheets and steel strips with a thickness less than or equal to 2.0mm.
International Standard:
ASTM A653/A653M-23 "Standard Specification for Hot-Dip Zinc (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) Steel Sheet," applicable to commercial and structural grade continuous hot-dip galvanized thin steel sheets and steel strips, specifying the chemical composition, mechanical properties, dimensions, shape, weight, zinc coating weight, zinc coating adhesion, and zinc coating appearance requirements.
BS EN 10346:2015 "Continuously hot-dip galvanized flat steel products for cold forming - Delivery conditions," specifies the technical requirements for continuous hot-dip galvanized thin steel sheets and steel strips, including dimensions, shape, weight, zinc coating weight, zinc coating adhesion, and zinc coating appearance, applicable to various fields such as construction, automobiles, and home appliances.

Usage

Construction Industry: Used to manufacture corrosion-resistant industrial and civil building roof panels, roof gratings, steel structure purlins (C, Z-shaped steel), light steel keel, ceiling keel, etc. It can also be used to build ventilation ducts, exterior building decorations, etc., effectively resisting external environmental corrosion and extending the service life of buildings.
Automotive Manufacturing: Mainly used to manufacture corrosion-resistant parts of cars, such as body structural parts, chassis parts, door frames, etc., helping to improve the overall corrosion resistance and safety of automobiles, enhancing the quality and service life of automobiles.
Home Appliance Industry: Can be used to manufacture home appliance casings, such as refrigerators, washing machines, air conditioners, etc., as well as household chimneys, kitchen utensils, etc. Its good formability and corrosion resistance can meet the requirements of home appliance products for appearance and durability.
Agriculture, Animal Husbandry, and Fisheries: Used for grain storage and transportation equipment, meat and aquatic product freezing processing tools, aquaculture facilities, etc., maintaining stable performance in humid and corrosive environments to prevent equipment rust and damage.
Other Fields: In commerce, it is mainly used for the storage and transportation of materials and packaging; it can also be used to manufacture steel pipes, such as greenhouse pipes, drinking water pipes, heating pipes, gas pipes, etc.; it is also used in the processing of some metal products, such as making various metal components and hardware accessories.

Product Introduction

Galvanized strip steel is made by plating a layer of zinc or zinc alloy material to varying degrees on a long and narrow strip of cold-rolled or hot-rolled steel.
Production Process: First, the entire roll of strip steel is pickled and cleaned to make its surface bright and clean. Then, it undergoes galvanizing treatment through hot-dip galvanizing, hot galvanizing, or direct galvanizing. Hot-dip galvanizing is cleaning after pickling in an ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, then galvanizing in a hot-dip galvanizing tank; hot galvanizing is cleaning after pickling in an ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, then entering a continuous annealing furnace and then galvanizing in a galvanizing tank; direct galvanizing is directly entering a continuous annealing furnace and then galvanizing in a galvanizing tank after pickling.
Product Features: Hot-dip galvanizing has the advantages of uniform coating, strong adhesion, and long service life. The substrate of galvanized strip steel undergoes a complex physical and chemical reaction with the molten plating solution, forming a corrosion-resistant, tightly structured zinc-iron alloy layer. The alloy layer, pure zinc layer, and strip steel substrate are integrated, so it has strong corrosion resistance. In addition, galvanized strip steel also has good processing properties and can be processed by stamping, bending, and welding to meet the forming needs of different products.

National Standard

GB/T 2518-2019 "Continuous Hot-Dip Galvanized Thin Steel Sheets and Steel Strips" is an important national standard for galvanized strip steel, and some of its contents are as follows:
Dimensions, Shape, and Allowable Deviations: Specifies the nominal thickness, nominal width, and allowable deviations in thickness, width, and length of galvanized strip steel. For example, the allowable deviation in thickness varies depending on the nominal thickness and nominal width, and the allowable deviation in width also has corresponding regulations depending on the different width ranges.
Technical Requirements: Includes aspects such as chemical composition, mechanical properties, zinc coating weight, zinc coating adhesion, and surface quality. The chemical composition should meet the requirements of relevant standards to ensure the mechanical properties and corrosion resistance of the product; mechanical properties such as tensile strength, yield strength, and elongation should meet the standard specifications; zinc coating weight is usually expressed in grams per square meter and should meet the corresponding requirements to ensure the corrosion resistance and economy of the product; zinc coating adhesion must meet the standard requirements to ensure that the zinc coating does not fall off during processing and use; the surface quality requires flatness, smoothness, and no obvious defects to ensure the appearance and corrosion resistance of the product.
Test Methods: Clarifies the specific test methods for various performance tests of galvanized strip steel, such as chemical composition analysis methods, mechanical property test methods, zinc coating weight and adhesion test methods, and appearance inspection methods.
Inspection Rules: Specifies the product inspection classification, batching rules, sampling quantity, and judgment rules, etc., to ensure that the product quality meets the standard requirements.
Packaging, Marking, and Certificate of Quality: Standardizes the packaging methods, marking content, and information to be included in the certificate of quality for galvanized strip steel, facilitating the transportation, storage, and identification of the product, and providing users with product quality certification documents.