1.closed die forging gear wheel 2.N+T+Q (heat treatment) 3.ISO9000,GL,BV,ABS 4.15 years' ... experience Commodity Name: closed die forging gear wheel Description ... Materials: Carbon, stainless steel ,alloy steel,etcDelivery Status: N + T+Q (Normalizing +Tempering+Quenching)... closed die forging gear ...