STC4 STC5 STC6韩国碳素工具钢 X38CrMoV5-3 X40CrMoV5工具钢SK7M SKS2MSKS5M冷轧特殊钢带SKH2 SKH3高速工具钢钨系高速工具钢HS6-5-2-5 HS6-5-3-8高速工具钢SK1 SK2 TC120日本碳素工具钢1.2838 1.2885 1.2886热作钢E204 G1Z H10 H20HC16硬质合钢X30WCrV9-3 X35CrWMoV5工具钢