Transactions of Materials and Heat Treatment

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

Authors： Huang Xin Wu Junsan Zhu Qianhao Bian Jiyang

Unit： Zhangjiagang Zhonghuan Hailu High-end Equipment Co. Ltd.

KeyWords： roller non-metallic inclusions ultrasonic inspection dye penetrant inspection scanning electron microscopy

ClassificationCode：TG316.1

year,vol(issue):pagenumber：2019,44(10):20-24

Abstract：

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%.

Funds：

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

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