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    Stainless steel profile

    2014/8/7 Viewers:

    All metal and atmospheric oxygen in the reaction, formed in the surface oxide film. Unfortunately, in the ordinary carbon steel formed on the oxidation of iron oxide to continue, kept expanding rust, eventually forming holes. Can use paint or resistant to oxidation of the metal (for example, zinc, chromium and nickel) on plating to ensure that the surface of carbon steel, but, as we know, the protection is only a thin film. If the cover was damaged, the following steel began to rust resistance to weak corrosive medium such as air, steam, water and acid, alkali, salt and other chemical etching medium corrosion of the steel. Also called acid-proof stainless steel. In practical application, often called the weak corrosive medium corrosion resistant steel stainless steel, and called the resistance to chemical corrosion medium steel acid-resistant steel. Due to the chemical composition on the difference between the two, the former does not necessarily medium resistance to chemical corrosion, while the latter are generally not rust. The corrosion resistance of stainless steel depends on the alloy element content in the steel. Chromium is the basic element to stainless steel for corrosion resistance, while about 1.2% chromium content in steel, chromium and oxygen effect of corrosive medium, in the steel surface to form a thin layer of oxide film (since the passivation film), but to prevent further corrosion of steel substrate. Commonly used alloying elements except chromium and nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., in order to meet the requirements of various applications on the microstructure and mechanical properties of stainless steel.

    Stainless steel usually according to the matrix was divided into:

    1, ferritic stainless steel. Chromium containing 12% ~ 30%. Its corrosion resistance, toughness and weldability with chromium content increases with the increase of chloride stress corrosion resistance is superior to other types of stainless steel.

    2, austenitic stainless steel. Chromium is more than 18%, still contain about 8% of the nickel and small amounts of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, corrosion resistant to a variety of media.

    3, austenitic, ferritic duplex stainless steel. The advantages of both austenitic and ferritic stainless steel, and has the superplasticity.

    4, martensite stainless steel. High strength, but the plasticity and poor weldability.

    5, precipitation hardening stainless steel. Has good formability and good weldability, and can be used as an ultra high strength of materials used in nuclear industry, aerospace industry.

    According to the composition can be divided into the Cr system (SUS400), the Cr - Ni (SUS300), the Cr - Mn - Ni (SUS200) and precipitation hardening (SUS600).