大規(guī)格SAE4330V-MOD合金鋼金礦鉆桿的熱處理工藝

大規(guī)格SAE4330V-MOD合金鋼金礦鉆桿的熱處理工藝Heat Treatment Process of Large-section SAE4330V-MOD Alloy Steel Drill Pipes Used in a Gold Mine

通過對大規(guī)格SAE4330V-MOD合金鋼金礦鉆桿進行不同溫度的淬火和回火熱處理,探討研究了該合金鋼的調(diào)質(zhì)熱處理工藝.結(jié)果表明:將該鋼先加熱到650 ℃保溫3 h,然后升溫至860 ℃保溫6 h后淬入不高于70 ℃水中,最后在620 ℃回火6 h后出爐空冷,該鋼可獲得均勻細小的回火索氏體組織,且抗拉強度、沖擊功和硬度等達到最佳匹配,各項力學(xué)性能均能滿足技術(shù)要求;若該鋼熱處理前的原始組織中存在少量的貝氏體,則會導(dǎo)致其熱處理后的力學(xué)性能不能滿足技術(shù)要求,因此熱處理前應(yīng)嚴格控制該鋼的原始顯微組織.

Through quenching and tempering the large-section SAE4330V-MOD alloy steel drill pipes used in a gold mine at different temperatures,the heat treatment process of the steel was studied.The results show that by first heating the steel to 650 ℃ and holding for 3 h,then heating to 860 ℃ and holding for 6 h following quenching in less than 70 ℃ water,and finally tempering at 620 ℃ for 6 h,uniform fine tempered sorbite microstructure could be obtained and best match among tensile strength,impact energy and hardness was achieved with various mechanical properties all meeting the technical requirements.If there was small amount of bainite in microstructure of the steel before heat treatment,it would lead the mechanical properties after heat treatment could not meet the requirements.Therefore,original microstructure of the steel should be strictly controlled.

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