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介绍了钢板超声波探伤的缺陷类型,对连铸板坯轧制中厚板后出现超声波探伤不合格的钢板进行取样、金相、电镜分析,找出引起中厚板探伤不合格的主要因素是钢中氢含量、铸坯中心偏析以及夹杂物;通过采用RH真空处理、钢水洁净度控制、铸机动态轻压下、加热工艺优化、控轧控冷工艺优化及板材堆垛缓冷等关键工艺技术,使钢板内在质量得到改善,探伤合格率明显提高。
Introduced the flaw type of ultrasonic flaw detection, slab rolling plate after ultrasonic flaw occurs unqualified steel sampling, metallurgical and electron microscopy analysis to find out the main cause of plate testing flaw is the main failure of steel Medium hydrogen content, center segregation of slab and inclusions. By using RH vacuum treatment, cleanliness control of molten steel, dynamic soft reduction of casting machine, optimization of heating process, optimization of controlled rolling and controlled cooling process, and slow cooling of sheet metal, , So that the internal quality of steel has been improved, significantly improved the pass rate.