中厚管线钢板非分层探伤不合分析及质量提升

Analysis and quality improvement of non-layered flaw detection for medium thick pipeline steel plates

摘要

管线钢探伤要求较高，高灵敏度探伤情况下，容易在钢板厚度1/4处出现点状探伤不合，认为此缺陷形态是由于钢基体声阻抗差别较大的Ca-AL-O系夹杂物引起的，通过优化冶炼过程中的Ca处理工艺有效实现了Ca-AL-O系夹杂物的大幅减少及球化，使得产品安全性得到提升。

Abstract

Pipeline steel has high requirements for non-destructive testing. In the case of high-sensitivity testing, it is easy for point like defects to occur at 1/4 of the steel plate thickness. It is believed that this defect morphology is caused by Ca-AL-O inclusions with large differences in acoustic impedance of the steel substrate. By optimizing the Ca treatment process during smelting, the significant reduction and spheroidization of Ca-AL-O inclusions have been effectively achieved, which improves product safety.

关键词

声阻抗 / Ca-AL-O系夹杂物 / Ca处理工艺 / 球化

Key words

acoustic impedance / Ca-AL-O inclusions / Ca treatment process / spheroidizing

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