锻压技术

70Cr3NiMo钢轧辊探伤不合格原因分析及改善措施

英文标题：Analysis on disqualification reason and improvement measures of steel 70Cr3NiMo roller by ultrasonic inspection

作者：黄鑫吴君三朱乾皓卞继杨

分类号：TG316.1

出版年,卷(期):页码：2019,44(10):20-24

摘要：

采用10500 kg锭型70Cr3NiMo钢锭锻造加工轧辊，检验发现锻件超声波探伤结果不符合标准要求，锻件心部位置存在密集和单点超标缺陷。为了找出探伤不合格原因，降低损失，采用化学成分分析、低倍检验、金相检验和扫描电镜分析等方法，对探伤缺陷位置进行了分析。分析结果表明，该轧辊探伤不合格原因是母材钢锭内部存在大量超级别Al2O3非金属夹杂物，这些夹杂物分割了钢材基体的连续性，造成探伤不合格。此外，通过分析Al2O3夹杂物的来源及其危害性，得到了对应的工艺改善方法。试验结果表明，改进后锻件探伤合格率为100%。

For the roller forged by steel ingot of 70Cr3NiMo (10500 kg), its quality do not meet the standard requirements by ultrasonic testing, and the defects of dense and single point exist in the center of forgings. In order to find out the cause of unqualified ultrasonic inspection and reduce the loss, the defect location was analyzed by chemical composition analysis, low power test, metallographic examination and scanning electron microscopy. The analysis results show that the reason

of unqualified ultrasonic inspection for roller is that there are a lot of super grade Al2O3 non-metallic inclusions in the base ingot, which break up the matrix continuity of steel. In addition, the source and harmfulness of non-metallic inclusions were analyzed, and the corresponding improvement measures are put forward. The experimental results show that the qualification rate of defect detection for the improved forgings is 100%.

基金项目：

作者简介：黄鑫（1988-），男，硕士，中级工程师 E-mail：hx.zjg@163.com

参考文献：

［1］陆荣,王乃时. 关于轧辊用钢70Cr3NiMo的补焊工艺研究
［J］.现代工业经济和信息化,2013,44(Z2):62-63.

Lu R, Wang N S. Research on repair welding technology of roll steel 70Cr3NiMo
［J］. Modern Industrial Economy and Informationization, 2013,44(Z2):62-63.

［2］康大韬,叶国斌.大型锻件材料及热处理
［M］.北京:龙门书局,1998.

Kang D T, Ye G B. Large Forging Material and Heat Treatment
［M］. Beijing: Longmen Publishing House, 1998.

［3］季德静,李春阳,郑大鹏,等.钢中Al2O3夹杂物的研究与处理
［J］.甘肃冶金, 2014,36(4):20-21,25.

Ji D J, Li C Y, Zheng D P, et al. Research and treatment of Al2O3 inclusions in steel
［J］. Gansu Metallurgy, 2014,36(4):20-21,25.

［4］GB/T 6402—2008,钢锻件超声检测方法
［S］.

GB/T 6402—2008, Steel forgings—method for ultrasonic testing
［S］.

［5］乙继海,邵奎祥,刘丽,等.大型支承辊锻坯端面裂纹状缺陷分析
［J］.大型铸锻件, 2012,3(2):20-23.

Yi J H, Shao K X, Liu L, et al. Analysis on crack-like defects of the forged blank end face of large backup roll
［J］. Heavy Casting and Forging, 2012,3(2):20-23.

［6］吕炎.锻件缺陷分析与对策
［M］.北京:机械工业出版社,1999.

Lyu Y. Analysis and Countermeasures of Forging Defects
［M］.Beijing: China Machine Press, 1999.

［7］郭俊波.Al脱氧钢中Al2O3夹杂物形态控制的研究进展
［J］.安徽冶金,2014,(4):19-23.

Guo J B. Progress of research on morphology control of Al2O3 inclusions in aluminum deoxidized steel
［J］. Anhui Metallurgy, 2014, (4):19-23.

［8］Kiessling R. Nonmetallic inclusions and their effects on the properties of ferrous alloys
［J］. Encyclopedia of Material Science and Technology, 2001,7(5): 6278-6283.

［9］任运来,牛龙江,陈志英,等.锻件内部脆性夹杂物边界裂纹锻合的应力条件
［J］.机械工程学报,2014,50(22):84-89.

Ren Y L, Niu L J, Chen Z Y, et al. Stress condition for healing the crack between the inclusion and the matrix metal in heavy forgings
［J］. Journal of Mechanical Engineering, 2014,50(22):84-89.

［10］张淑心.重轨D60钢中Al2O3夹杂物形貌和形成机理的研究
［J］.化工冶金,1992,13(3):219-223.

Zhang S X. Morphology and formation of Al2O3 inclusion in D60 heavy-rail steel
［J］.Engineering Chemistry & Metallurgy, 1992,13(3):219-223.

［11］陆宝山,王雷刚,季业益.70Cr3Mo钢支承辊超探不合格原因分析及改进措施
［J］.锻压技术, 2017,42(7):6-13.

Lu B S, Wang L G, Ji Y Y. Analysis on disqualification reason and improvement measures of steel 70Cr3Mo back-up roll by ultrasonic inspection
［J］. Forging & Stamping Technology, 2017, 42(7):6-13.

［12］陈海堤,王涛,罗玉立.400 t级巨型钢锭偏析及夹杂物分布研究
［J］.大型铸锻件,2013,1(1):9-15.

Chen H D, Wang T, Luo Y L. Research on segregation and inclusion distribution of 400 t level heavy steel ingot
［J］. Heavy Casting and Forging, 2013,1(1):9-15.

［13］张绍军,阚玉琦. 核电站核岛筒体类锻件锻造工艺参数的分析与确定
［J］. 金属铸锻焊技术,2011, (9):106-108.

Zhang S J, Kan Y Q. Analysis and determination of forging process parameters of cylinder shell forgings for nuclear power plant nuclear island
［J］. Casting Forging Welding,2011, (9):106-108.

［14］龚纪伟.大型冷轧辊的电渣重熔工艺研究
［J］.黑龙江冶金,2012,32(2):10-12.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】