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55Si2Mn標(biāo)準(zhǔn)：GB/T 1222-1984●特性及適用范圍：化學(xué)成分●化學(xué)成份：碳 C ：0.52～0.60硅 Si：1.50～2.00錳 Mn：0.60～0.90硫 S ：≤0.035磷 P ：≤0.035鉻 Cr：≤0.35鎳 Ni：≤0.35銅 Cu：≤0.25力學(xué)性能●力學(xué)性能：抗拉強(qiáng)度 σb (MPa)：≥1274(130)屈服強(qiáng)度 σs (MPa)：≥1176(120)伸長率 δ10 (%)：≥6斷面收縮率 ψ (%)：≥30硬度 ：熱軋,≤302HB;冷拉+熱處理,≤321HB熱處理工藝●熱處理規(guī)范及金相組織：熱處理規(guī)范：淬火870℃±20℃,油冷; 回火480℃±50℃(特殊需要時(shí),±30℃)。金相組織：回火屈氏體。●交貨狀態(tài)：熱軋鋼材以熱處理或不熱處理狀態(tài)交貨，冷拉鋼材以熱處理狀態(tài)交貨。對應(yīng)牌號對應(yīng)美國牌號：9260對應(yīng)日本牌號：SUP6對應(yīng)德國牌號：55Si7對應(yīng)英國牌號：251II60對應(yīng)法國牌號：56SC7對應(yīng)國際標(biāo)準(zhǔn)牌號：56SiCr7
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