新品 廠家供應(yīng)優(yōu)質(zhì)杭鋼 冷軋光亮帶鋼 65M
中國彈簧鋼:65 70 75 80 85 65mn 55si2mn 55si2mnb 55simnvb 60si2mn 60si2mna 60si2cra 60si2crva 60crmna 50crmn 55crmna 50crva 60crmnba 60crmnmoa 30w4cr2va 100crmn6 100cm6 100crmn7 100crmnmo8 100crmo7-2 100cd7 100crmo7-3 100crmo8-3
