This kind of steel has good creep resistance and damping performance under 500C. Commonly used are Cr13,2cr13 ' lcriimov, 15cr12mov, 15cr12wmova, etc., mainly for the manufacture of steam turbine blades, guide blades, low-pressure gas turbine impeller and so On.
The former has a chromium content of 100-/0~130-/0, while adding a small amount of W. MO.V and other elements to improve the recrystallization temperature of the matrix and to form a stable carbide, further strengthening the MATRIX.
Martensitic heat-resistant steels are generally heated and quenched above 1000CC to ensure full dissolution of all carbides and effective use of alloying elements, and then oil or air cooling. Tempering temperature should be regarded as workpiece operating temperature and performance requirements selected, generally higher than the use of temperature 100 ℃, attention to avoid tempering brittle zone. After tempering the air-cooled or oil-cooled, its microstructure is more stable tempering troostite or tempering Sorbite.