When the excavator casting manufacturer is used for water steam medium with low pressure medium temperature exceeding 300 ℃, A5 ordinary carbon steel is generally selected. 35 high quality carbon steel is generally used for medium pressure medium temperature of water steam medium exceeding 450 ℃.
The excavator casting is generally made of 40Cr (chromium steel) when it is used for medium pressure high pressure medium, such as water, steam, oil other medium with medium temperature exceeding 450 ℃. 38CrMoAlA nitriding steel can be used for water, steam other media with high pressure medium temperature exceeding 540 ℃. When it is used for steam medium with high pressure medium temperature exceeding 570 ℃, 25Cr2MoVA chrome molybdenum vanadium steel is generally selected.
Stainless acid resistant steel s is used for non corrosive medium weak corrosive medium with medium pressure high pressure medium temperature exceeding 450 ℃. 1Cr13, 2Cr13 3Cr13 chromium stainless steel can be selected. For corrosive medium, Cr17Ni2, 1Cr18Ni9Ti, Cr18Ni12Mo2Ti, cr18ni12mo3ti ph15-7mo precipitation hardening steel can be selected.
Heat resistant steel
4Cr10Si2Mo martensitic heat-resistant steel 4Cr14Ni14W2Mo austenite heat-resistant steel can be used for high temperature valve with medium temperature exceeding 600 ℃.