30Mn水淬鋼調(diào)質(zhì)熱處理工藝的研究
Study on Quenching-and-tempering Process of Water-quenched 30Mn Steel
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摘要: 測定了30Mn鋼的CCT曲線和淬透性。研究表明,當冷卻速度大于60℃/s時,能得到50%以上的馬氏體組織,淬透性能滿足Φ245 mm×13.84 mm以下油井管的要求。在此基礎上研究了不同的回火溫度、回火保溫時間、淬火溫度和淬火保溫時間對30Mn鋼組織性能的影響規(guī)律,制訂了實驗室條件下的調(diào)質(zhì)熱處理工藝,并進行了試驗研究。結(jié)果表明,經(jīng)此調(diào)質(zhì)工藝處理后,材料的力學性能達到了API5CT標準要求。作為水淬鋼種,30Mn鋼可用來生產(chǎn)N80Q鋼級的油井管。Abstract: The continuous cooling transformation or CCT characteristics and hardenability of the 30Mn steel are investigated. The results show that when cooling rate is higher than 60℃/s, in the metallurgical structure of the specimen martensitic structure accounts for over 50%, and the hardenability is up to the requirement as set for oil well pipes with sizes under Ф 245mm×13.84 mm. Based on these data, further investigation is conducted, involving the law of the effect of different temper temperature & temper soaking time and the quench temperature & quench soaking time on the mechanical properties of the 30Mn steel. Accordingly, relevant lab quenching-and-tempering process is designed and performed experimentally, resulting in the conclusion that the mechanical properties of the 30Mn steel as quenched and tempered has met relevant requirements as specified in API Spec 5CT, and thus the 30Mn steel as a kind of water-quenched steel is applicable to the production of N80Q oil well pipes.
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