2023年第4期广东化工第50卷总第486期www.gdchem.com·127·高强韧性石油装备连接件用钢生产工艺实践吕亮,郑力宁,石可伟,张洪才(江苏沙钢集团淮钢特钢股份有限公司总工办,江苏淮安223002)[摘要]淮钢采用90吨顶底复吹转炉+LF炉外精炼+RH真空脱气处理+Φ500mm圆坯连铸的工艺生产4130石油装备连接件用钢(/%:0.30~0.33C,0.20~0.35Si,0.50~0.60Mn,≤0.010P,≤0.003S,1.10~1.20Cr,0.20~0.30Ni,≤0.20Cu,0.20~0.25Mo,0.01~0.02V,0.015~0.040Nb)。通过控制出钢碳≥0.08%,出钢温度1630~1670℃,精炼过程利用电石和铝粒强化渣面脱氧,RH真空度≤100Pa,真空保持时间≥25min,浇铸过程全程保护浇铸等措施,4130连铸圆坯各项指标均符合技术要求,并且经过用户锻造加工后,取样检测力学性能,屈服强度可以达到95K级以上,冲击韧性指标也能符合标准要求,非金属夹杂物、晶粒度以及探伤结果均满足用户要求。[关键词]4130;高强度;高冲击韧性;生产工艺实践;石油装备[中图分类号]TQ[文献标识码]A[文章编号]1007-1865(2023)04-0127-02ProcessPracticeofHightStrengthandImpactSteelUsedforAdaptingPieceofOilEquipmentLvLiang,ZhengLining,ShiKewei,ZhangHongcai(ChiefEngineer’sOfficeJiangsuShagangGroupHuaigangSpecialSteelCo.,Ltd.,Huai’an223002,China)Abstract:TheΦ500mm4130steelforadaptingpiece(/%:0.30~0.33C,0.20~0.35Si,0.50~0.60Mn,≤0.010P,≤0.003S,1.10~1.20Cr,0.20~0.30Ni,≤0.20Cu,0.20~0.25Mo,0.01~0.02V,0.015~0.040Nb)wasproducedby90tLDwithtop-bottomblowing-LF-RH-Φ500mmbilletconcasting-continuousatHuaigangSpecialSteel.BycontrollingLDend[C]≥0.08%,LDendtemperature1630~1670℃,usingaluminumparticleandcarbidetoenhanceslagsurfacedeoxidation,RHvacuum≤100Pa,keepingvacuumtime≥25min,protectingcastinginthewholeprocess,alltechnicalindexesaresatisfycustomer’srequirements,samplingandtestmechanicalafterforging,theyieldstrenghtisexceed95Kclass,impactresultsalsosatisfythespecification.Nonmetallicinclusions,grainsizeandUltrasonictestresultsmeetuserrequirements.Keywords:4130;highstrength;highimpact;processpractice;oilequipment对于长距离传输石油、天然气等能源时,各管道之间需要使用连接件相互连接。此时连接件用钢除了需要具备良好的焊接性能,还需要具备耐腐蚀性能、高...