螺栓选用优质合金钢，螺母、垫圈选用优质碳结钢，圆柱头焊钉选用ML 15al。
The bolts are made from excellent quality alloy steel, the nuts and washers are made from carbon steel, cheese head studs for stud welding are made from ML15AL.
汽车用钢主要是优质型材，以合结钢、碳结钢和弹簧钢为主。
The steel for auto is mostly high grade profiled steel, among this, alloy steel, carbon steel, spring steel are mostly.
汽车用钢主要是优质型材，以合结钢、碳结钢和弹簧钢为主。
The steel for auto is mostly high grade profiled steel, among this, alloy steel, carbon steel, spring steel are mostly.
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