SNCM625冷墩钢材品质 合适的冷镦变形组织是碳化物球化组织,其强度和硬度降低,塑性较好有利于冷镦变形。马钢以ZL18A自攻螺丝用冷镦钢丝,球化退火温度为(680±10℃)保温4h,钢丝的渗碳体球化效果较好。ZL18A自攻螺钉用盘条冷镦开裂,其原因是用户省略了球化退火的工序,拉拔后直接冷镦造成的。为满足用户的这种要求而提出的措施:C、Mn含量按中下限控制;负偏差轧制,减小拉拔的总变形量;改进轧制工艺,降低盘条的强度,减少或避免魏氏组织。ML35、ML45为典型中碳冷镦钢丝,当冷镦变形量>60%时,在冷镦前应进行720℃、保温4h的球化退火,使珠光体球化组织达到4~6级,钢丝的加工塑性。主要材质有: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等价格优惠! 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,