Hardened, precision ground, chromemolybdenum gears in headstock.
硬化，精密研磨，在车头铬钼齿轮。
2
Valve of the main materials are cast iron, ductile iron, carbon steel, alloy steel, stainless steel, chromemolybdenum steel, and other materials.
阀门主体材质有铸铁、球铁、碳钢、合金钢、不锈钢、铬钼钢等材质。
3
In this paper regression analyses for the relations between strength and hardness of chrome - Nickel - Molybdenum steel are carried out, the relevant formulas of the regression relations are set up.