日本易切削结构钢 SUM11 SUM12 SUM21 SUM22L SUM23 SUM23L SUM24L SUM25 SUM31 SUM31L SUM32 SUM41 SUM42 SUM43日本冷镦用碳钢盘条SWRCH6R SWRCH8R SWRCH10R SWRCH12R SWRCH15R SWRCH17R SWRCH6A SWRCH18A SWRCH10A SWRCH12A SWRCH15A SWRCH16A SWRCH18A SWRCH19A SWRCH20A SWRCH22A SWRCH10K SWRCH12K SWRCH15K SWRCH16K SWRCH17K SWRCH18K SWRCH20K SWRCH22K SWRCH24K SWRCH25K SWRCH27K SWRCH30K SWRCH33K SWRCH35K SWRCH38K SWRCH40K SWRCH41K SWRCH43K SWRCH45K SWRCH48K SWRCH50K日本弹簧钢 SUP3 SUP6 SUP7 SUP9 SUP9A SUP10 SUP11A SUP12 SUP13日本冷轧弹簧钢带S50C-CSP S55C-CSP S60C-CSP S65C-CSP S70C -CSP SK5-CSP SK4-CSP XUP10-CSP日本高碳铬轴承钢SUJ1 SUJ2 SUJ3 SUJ4 SUJ5韩国普通结构用碳素钢 SS330 SS400 SS490 SS540 韩国钢管用热轧碳素钢带 HRS1 HRS2 HRS3 HRS4 韩国机械结构用碳素钢 ***9CK ***15CK ***20CK ***10C ***12C ***17C ***20C ***22C