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7V1 valve body and valve seat of valve assembly are made from high-quality knot steel treated with 20CrMnTi carburizing and quenching processes.
Liner Outer Sleeve: 45#forged steel, tensile strength is σb>610MPa, yield strength is σs>450MPa, ,elongation hardness is §>17%,hardness is HRC180-200 Liner Inner Sleeve: high chromium cast iron (centrifugal forged). Annealing hardness is HRC≤40. Quenching hardness is HRC59-64
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