SNCM625冷墩鋼材品質(zhì) 合適的冷鐓變形組織是碳化物球化組織,其強度和硬度降低,塑性較好有利于冷鐓變形。馬鋼以ZL18A自攻螺絲用冷鐓鋼絲,球化退火溫度為(680±10℃)保溫4h,鋼絲的滲碳體球化效果較好。ZL18A自攻螺釘用盤條冷鐓開裂,其原因是用戶省略了球化退火的工序,拉拔后直接冷鐓造成的。為滿足用戶的這種要求而提出的措施:C、Mn含量按中下限控制;負(fù)偏差軋制,減小拉拔的總變形量;改進軋制工藝,降低盤條的強度,減少或避免魏氏組織。ML35、ML45為典型中碳冷鐓鋼絲,當(dāng)冷鐓變形量>60%時,在冷鐓前應(yīng)進行720℃、保溫4h的球化退火,使珠光體球化組織達到4~6級,鋼絲的加工塑性。主要材質(zhì)有:SWRCH6A、SWRCH8A、SWRCH10A、SWRCH15A,SWRCH18A, SWRCH22A, SWRCH35K,SWRCH45K,ML08AL,ML40CR,30CrMnTi,ML20MnTiB,ML35,ML15,SWRM6-1,SCM435,B55SiCr、60Si2MnA、SWRH90A、ER70S-G、GCr15 MFT8, 35CrMo、20Cr、20Mn2、20CrMnMo、30CrMnTi、T07A、QD08,35#,45#, SCM440等價格優(yōu)惠! SCM415,SCM420,SCM435,SCM440,B7,ML20CRMO,ML35CrMO,ML42CrMO,ML20MnTiB,10B18,10B21,10B28,10B30,10B33,10B38,ML20CrMnTi,30crmnti 50BV30 GCr15 40#,45#,65#,70#,80# SWRH42B, SWRH47B, SWRH72B, SWRH77B,S10C,S20C,S40C,S50C SWRH82A,SWRH82B,87B SWRM6,SWRM10,SWRM12,SWRM15,XGM2 6 5Mn,60Si2MnA,55SiCr,60Si2CrVAT 16MNCR5 ∮6.5—42 SWRCH6A, SWRCH10A, SWRCH18A, SWRCH22A,ML08AL,ML10AL,SWRCH10K, SWRCH15K,SWRCH20K,SWRCH35K, SWRCH40K,SWRCH45K, SWRCH50K,SAE1010,SAE1012,SAE1015,SAE1020,SAE1022,SAE1035,SAE1045,