20MnMo管板件锻造缺陷分析及工艺改进.pdfVIP

第 13 卷 　总第 50 期 特钢技术 Vol. 13 (50) 2007 年第 1 期 Special Steel Technology 2007 ,No. 1 20MnMo 管板件锻造缺陷分析及工艺改进 周 　勇 攀钢集团四川长城特殊钢股份有限公司特冶中心 四川 　江油 　621704 　　摘 　要 :管板件产量在我厂锻件总量中占有很大的比例 ,但该产品内部质量极不稳定 ,探伤废品量大 ,经济损失 惊人。改善 20MnMo 管板件的内部质量 ,提高产品合格率的重要性就不言而喻。通过分析认为缺陷属于塑性夹杂性 裂纹 ,根据缺陷形成原因 ,结合现有设备能力及工装的情况 ,提出了一个适合本厂的锻造工艺方法。经过生产实践 证明通过此锻造方法来进行改进锻造工艺、优化工艺参数对改善 20MnMo 管板件内部质量是切实可行的。 关键词 : 内部质量 　塑性夹杂性裂纹 　锻造工艺 　工艺参数 Analysis on Forging Defects in Pipe - fitting Disc of Steel 20MnMo and Improvement of its Production Process Zhou Yong Special Smelting Center , Sichuan Changcheng Special Steel Co. Ltd. , Pangang Group 　　Abstract :The output of pipe - fitting Disc occupies a large proportion of the total forging output , but the internal quality of the products mentioned above are unstable , a large quantity of products could not pass the ultrasonic test , thus a lot of economic loss was caused , so it is self - evident to improve the percent of pass of the product. The analysis showed that the defects was crack caused by plastic inclusion , hence a proper forging process was pointed out based on the current equipment capacity and technologi cal equipment. Production process showed that it is feasible to improve the internal quality of pipe and plate fitting of steel 20MnMo by improvement of forging process and optimization of process parameters. Key Words :Internal quality , Cracking caused by plastic inclusion , Forging process , Process Parameter ( 　　近年来 ,我厂生产的 20MnMo 管板件 外形尺寸 拔长下料 →坯料预镦粗 →平板镦粗 + 局部镦粗成 特征是高径比 H/ D 1)