石油钻具用4145高强钢缺陷原因分析和改进措施  

Cause analysis and improvement measures for defects of high strength 4145 steel used in oil drilling tool

作　　者：凌文丹 王锦永 高杰 齐希伦 陈明义 陈新河 Ling Wendan;Wang Jinyong;Gao Jie;Qi Xilun;Chen Mingyi;Chen Xinhe(Hebi Institute of Engineering and Technology,Henan Polytechnic University,Hebi Henan 458030,China;Handan Xinxing Special Pipe Co.,Ltd.,Handan Hebei 056300,China)

机构地区：[1]河南理工大学鹤壁工程技术学院,河南鹤壁458030 [2]邯郸新兴特种管材有限公司,河北邯郸056300

出　　处：《金属热处理》2023年第8期280-285,共6页Heat Treatment of Metals

基　　金：河南省科技攻关项目(182102210086);河南省高等学校重点科研项目(23B460027)。

摘　　要：对高强度4145钢的成形和热处理工艺进行了开发,在生产和研究过程中产生了两类缺陷。对缺陷的宏观特征和微观特征进行了对比,分析了产生的原因,并且提出了应对措施。结果表明,1号类型缺陷与钢管的轴线方向呈一定夹角,深度约0.9 mm,脱碳层厚度0.090~0.157 mm,是轧制成形过程中由于轧制工具表面质量差导致的折叠;2号类型缺陷垂直于钢管轴线,裂透或者深度超过2 mm,脱碳层厚度不大于0.1 mm,是淬火冷速过快导致的淬火裂纹。通过控制轧制成形工具质量解决了轧制缺陷,通过优化化学成分和淬火工艺解决了淬火裂纹缺陷。经过检测验证,采用改进措施生产的钢管质量合格。Forming and heat treatment process of high strength 4145 steel was developed,but two types of defects were resulted during the producing and research processes.The macro and micro characteristics of the defects were compared,the causes were analyzed,and countermeasures were proposed.The results show that the first type defect is the folding caused by the poor surface quality of rolling tools in the rolling forming process,which forms a certain angle with the axis direction of the steel pipe,the depth is about 0.9 mm,and with the decarburized layer thickness of 0.090-0.157 mm.The second type defect is perpendicular to the axis of the steel pipe,cracking through or the depth exceeding 2 mm,and the thickness of the decarburized layer is not more than 0.1 mm,which is determined as the quenching crack caused by rapid quenching cooling rate.Then the rolling defects are avoided by controlling the quality of rolling forming tools,and quenching crack defects are solved by optimizing the chemical composition and quenching process.After testing and verification,the quality of the steel pipe produced by the improved measures is qualified.

关 键 词：高强度4145钢 热轧成形 热处理 微观特征 脱碳层 淬火裂纹 

分 类 号：TG156.6[金属学及工艺—热处理]