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Chemical composition classification and mechanical properties of stainless steel castings
- Jul 20, 2018 -

Stainless steel castings can be classified according to their chemical composition during operation. In general, stainless steel has two major categories: Cr stainless steel, Cr and Ni stainless steel. Stainless steel castings mainly affect the corrosion performance of stainless steel during the use of the content of c and precipitated carbide, so the corrosion-resistant stainless steel contains C as low as possible, usually C ≤ 0.08%, but the high temperature mechanical properties of heat-resistant steel It is determined by the stable carbide precipitation phase in its structure, so the heat-resistant steel has a high C content, and the carbon content is generally 0.20% or more.

Stainless steel castings are mainly made of chromium as the main alloying element. Generally, the amount of Cr is generally between 13% and -30%. It will have good resistance to oxidizing medium corrosion and high temperature when operating. Resistance to air oxidation, to a certain extent, can also be used as heat-resistant steel. The welding performance of such steel is poor. When the chromium content is greater than 16%, the as-cast microstructure is coarse, and the long-term heat preservation between 400-525 ° C and 550-700 ° C will result in a "475 ° C" brittle phase and a σ phase, making the steel brittle.

In order to effectively improve the mechanical properties of the weld zone and the heat-affected zone, stainless steel castings are usually added with a small amount of Ti and Nb, so that the heat-affected zone can be effectively prevented to some extent. The grain grows. Commonly used ferritic steels are ZGCr17 and ZGCr28. This type of steel has low impact toughness and is replaced by austenitic stainless steel containing high nickel in many cases. A ferritic steel containing more than 2% of Ni and an amount of N exceeding 0.15% has good impact properties.