摘要
采用膨胀法测定了56 mm薄板坯连轧成6 mm板的30CrMo钢(/%:0.32C、0.20Si、0.60Mn、0.20Ni、0.97Cr、0.18Mo)在0.03～15.60℃/s冷却速率下的连续冷却转变(CCT)曲线并观察了各冷却速率下的显微组织。得出30CrMo钢的相变临界点Ac_3=800℃,Ac_1=735℃,B_s=510℃,M_s=340℃,M_r=220℃。应用结果表明,30CrMo钢6 mm板卷取后的空冷的冷却速率≤0.06℃/s,当卷取温度为610～640℃时获得铁素体+珠光体组织,避免贝氏体形成导致强度显著升高和塑性变差。
The continuous cooling transformation（CCT） curves with cooling rate 0.03～15.60℃/s of Steel 30CrMo （/%：0.32C,0.20Si,0.60Mn,0.20Ni,0.97Cr,0.18Mo） 6 mm plate continuous-rolled by 56 mm thin slab are measured by using dilatation method and the microstructure of steel with different cooling rate is observed to get the phase transformation point of steel 30CrMo- Ac_3 = 800℃,Ac_1 = 735℃,B_s=510℃,M_s=340℃and M_f= 220℃.Application results show that the cooling rate of 6 mm plate after coiling is≤0.06℃,as coiling temperature is 610～640℃,the structure of steel 30CrMo is ferrite ＋ pearlite,it is available to avoid forming bainite structure that leads to obvious increase of strength of steel and deterioration of plasticity of steel.
出处
《特殊钢》
北大核心
2012年第3期44-46,共3页
Special Steel
基金
2010年广东省重大专项:先进汽车结构用钢共性技术研究及产业化(2010A080407003)
