供应cr12模具钢cr8圆钢D2钢板P20H钢S136光板DC53冷作模具钢 ¥10.00 SKD11模具钢718H圆钢NAK80钢板1.2367钢KRCX冷拉光圆 ¥10.00 5crnimo模具钢cr12mo1v1圆钢15crni6钢板PAK90钢5crmnmo钢 ¥8.00 供应SKS3模具钢SKD7圆钢cr18钢板SKD2钢3cr2mo钢现货规格齐全 ¥6.00 供应A3合金钢Q235圆钢Q215钢板Q195钢Q255钢Q245钢 ¥5.00 30crmnsi圆钢12crni3a合金结构钢15mnvb钢板55cr3钢38crmoA ¥5.00