Stainless Steel Casting Good Corrosion Resistance
Stainless steel: chromium content of more than 12% of the iron-based alloy known as stainless steel, stainless steel and acid-resistant steel in general. Stainless steel is resistant to atmospheric, steam and water and other weak corrosive media of steel, and acid-resistant steel is resistant to acid, Stainless Steel Casting alkali, salt and other chemical corrosion of corrosion of the medium of steel, stainless steel and acid-resistant steel in the degree of alloying are quite different , Stainless steel, although it has a stainless, Stainless Steel Casting but not necessarily acid; and acid-resistant steel are generally rusty, in the air or chemical corrosion medium can resist corrosion of a high alloy steel, stainless steel is a beautiful surface and Corrosion resistance, do not have to wait through the surface treatment of color, and play the inherent surface properties of stainless steel, Stainless Steel Casting used in a wide range of steel, usually called stainless steel. Classification of chemical composition Stainless steel Cr stainless steel and Cr, Ni stainless steel two categories. The corrosion resistance of stainless steel is mainly C content and precipitation of carbides, so corrosion-resistant stainless steel containing C as low as possible, Stainless Steel Casting usually C ≤ 0.08%, but the high temperature mechanical properties of heat-resistant steel is determined by its organization stability Of the carbide precipitation phase, so the heat-resistant steel containing C are high, generally carbon content of 0.20% or more.
The microstructure of the composite steel is usually containing 5% -40% ferrite to improve the weldability of the alloy, increase the strength and improve the resistance to stress corrosion. Stainless Steel Casting For example, Cr28% -Ni10% -C0.30% high-carbon high-chromium alloy steel, with good resistance to sulfuric acid corrosion, can be used to manufacture castings. On this basis, the development of controllable ferrite steels, with high strength, and in the sulfate have good resistance to stress corrosion, Stainless Steel Casting commonly used in the oil industry devices.
Martensitic stainless steels include martensitic stainless steel and precipitated hardened stainless steel. In engineering applications, mechanical properties are the main purpose. Stainless Steel Casting Although these steels have good corrosion resistance in atmospheric corrosion and less aggressive corrosive media (such as water and certain organic media), their corrosion properties are often not tested. The chemical composition of the range is: Cr13% -17%, Ni2% -6%, C ≤ 0.06%. Metallic microstructure is mainly low carbon slat martensite, therefore, has excellent mechanical properties, strength index is more than twice the austenitic stainless steel, but also has good process performance, Stainless Steel Casting especially the welding performance. So in the important engineering applications occupy a very important position, is the casting of stainless steel in the field of an important branch.