【摘要】 测定了30Mn钢的CCT曲线和淬透性,研究表明,当冷却速度大于60℃/s,能得到50%以上的马氏体组织,淬透性能满足Φ245mm×13.84mm以下油井管的要求。该钢种在实验室条件下经调质处理,性能可以满足API5CT的要求。此外还测定了其热膨胀系数,为定径机孔型设计提供了依据。更多还原

【Abstract】 The CCT curve and hardenability of 30Mn steel were investigated.Results show that when cooling rate is higher than 60℃/s,the metallurgical structure of specimens contain more than 50% volume fraction of martensite,and the hardenability can reach the requirement of oil well pipes below Φ245mm×13.84mm.On experiment conditions,performance of 30Mn steel with modified treatment can meet API 5CT criterion. Besides,thermal expansibility of 30Mn was also studied,which could be used as theoretical basis for design of grooves of sizing mill.更多还原