The Heat Treatment of Martensite Corrosion-resistant Stainless Steel Investment Castings
The chromium content of corrosion-resistant stainless steel investment castings is l3%, and it has a higher carbon content, good hardenability. After appropriate heat treatment, corrosion-resistant stainless steel investment castings not only has good mechanical properties, but also has good corrosion resistance.
We usually selected 950 ~ 1050℃ in the corrosion-resistant stainless steel investment castings quenching process. Then is the oil quenching or air cooling that is 650 to 750℃. Next step is temper – that is, quenching. Generally, it should be tempered immediately after quenching to prevent the stress caused by quenching casting cracking. Quenched and tempered sorbite state organizations and ferrite. Contains a small amount of nickel, molybdenum, silicon and other elements of high-strength low-carbon corrosion-resistantstainless steel investment castings, the tempering treatment is a good comprehensive mechanical properties, weldability and wear resistance. So the corrosion-resistant stainless steel investment castings are widely used in large turbine impeller welded or cast the whole cast. The heat treatment usually chosen specification 950 ~ 1050℃.