CAJ | 학술논문

通过采用金相显微镜，扫描电镜和能谱仪对S355K2钢板探伤不合部位取样进行观察、分析后可知，试样内部的微裂纹及贝氏体带是产生缺陷回波的主要原因。为此，采取强化精炼手段控制、对下线连铸坯实施堆垛缓冷、优化冷料厚板坯加热时间等措施，保证了成材率，使S355K2钢板的探伤合格率提高了2%。
통과채용금상현미경，소묘전경화능보의대S355K2강판탐상불합부위취양진행관찰、분석후가지，시양내부적미렬문급패씨체대시산생결함회파적주요원인。위차，채취강화정련수단공제、대하선련주배실시퇴타완랭、우화랭료후판배가열시간등조시，보증료성재솔，사S355K2강판적탐상합격솔제고료2%。
Through sampling from the ultrasonic inspection disqualified position of S355K2 steel plate, observing and analyzing via metalloscope, scanning electron microscope and energy dispersive spectrometer, we knew the major factor of flaw echo from tiny crack and/or bainite zone. For this reason, we adopted refining measure controlling, stacking slow cooling to off line continuous casting slabs, optimizing reheating time to cold slabs etc, guaranteed the yield, and the qualified rate of S355K2 steel plate raise 2%.