Valve of the main materials are cast iron, ductile iron, carbon steel, alloy steel, stainless steel, chromemolybdenumsteel, 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。
2
For those local surface defects on chromesteel and chrome-molybdenumsteel, welding rod A402 may be used for repairing, no other treatment is necessary.
铬钢和铬钼钢表面局部缺陷焊补可采用A402焊条补焊，不需处理。
3
The nitrite chrome-molybdenumsteel crankshaft guarantees the best tensile strength and surface hardness for long-time operation.