SWCH16A~SWCH18A冷墩钢--六角棒直销 SWRCH27K SWRCH30K SWRCH33K SWRCH35K SWRCH38K SWRCH40K SWRCH41K SWRCH43K SWRCH45K SWRCH48K SWRCH50K SWCH6R SWCH8R SWCH10R SWCH6A SWCH8A SWCH10A SWCH12R SWCH15R SWCH12A SWCH15A SWCH10K SWCH12K SWCH17R SWCH16A SWCH18A SWCH20A SWCH15K SWCH19A SWCH16K SWCH17K SWCH18K SWCH20K SWCH22A SWCH22K SWCH25K 易切削结构钢: SUM11 SUM12 SUM21 SUM22 SUM22L SUM23 SUM23L SUM24L SUM25 SUM31非调质钢分为热锻用非调质钢、直接切削用非调质钢、冷作强公非调质钢和高韧性非调质钢。热锻用非调质钢用于热锻件(如曲轴、连杆等),直接切削用非调质钢用热轧件直接加式成零件,冷作强化非调质钢用于标准件(如螺栓、螺母等),高韧性非调质钢用于要求韧性较高的零部件