Galvanized steel is to prevent corrosion of the steel surface to extend its life, the surface coated with a layer of zinc metal, this zinc-coated steel called galvanized sheet.
Galvanized sheet steel products are mainly used in construction, light industry, automobiles, agriculture, animal husbandry and fishery and commercial industries. Among them, the construction industry is mainly used for the manufacture of anti-corrosion industrial and civil building roofing panels, roof grilles and the like; the light industry is used for the manufacture of household appliance housings, civil chimneys, kitchen utensils, etc. The automotive industry is mainly used to manufacture corrosion- ; Farming, animal husbandry and fishery is mainly used for food storage and transportation, meat and aquatic products frozen processing equipment; commercial mainly used for storage and transportation of goods, packaging equipment.
Stainless steel is resistant to air, steam, water and other weak corrosive media and acid, alkali, salt and other chemical etching corrosive media, also known as stainless steel acid-resistant steel. In practical application, the steel which is resistant to the corrosion of weakly corrosive medium is often referred to as stainless steel, and the steel which is resistant to chemical medium is called acid-resistant steel.
Stainless steel often divided according to the state of the organization: martensitic steel, ferritic steel, austenitic steel, austenitic – ferritic (duplex) stainless steel and precipitation hardening stainless steel. In addition, can be divided into components: chromium stainless steel, chrome-nickel stainless steel and chromium manganese nitrogen stainless steel.
The corrosion resistance of stainless steels decreases with increasing carbon content, so most stainless steels have a low carbon content of up to 1.2% and some have a Wc (carbon content) of less than 0.03% (such as 00Cr12 ). The main alloying element in stainless steel is Cr (chromium). Only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, the stainless steel generally Cr (chromium) content of at least 10.5%. Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si and other elements.
Stainless steel is not prone to corrosion, pitting, corrosion or wear. Stainless steel is one of the most intense materials in construction metals. Because stainless steel has good corrosion resistance, it enables structural components to permanently maintain the integrity of the engineering design. Chromium-containing stainless steel also combines mechanical strength and high elongation in one, easy to manufacture parts to meet the needs of architects and structural designers.