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1、事故情况 1997年11月28日,我厂可控气氛炉生产线值班人员在设备巡视中发现,仪表指示碳势偏高,设定值为1.0％,实际指示值为1.3％以上,且有渐渐升高的趋势,于是对温度控制系统、碳势控制系统和滴注系统作了检查,控温微机显示温度920℃与设定温度一致;氧探头内阻1.5kΩ,输出毫伏值偏高;滴注电磁阀通断灵活,阀体关断时没有渗漏,滴注管道、压力正常。认为是氧探头积碳太多,作了烧碳处理,没有引起足够重视。出炉后检查工件时发现,渗层严重超差,工艺要求
1, the accident situation November 28, 1997, I plant control atmosphere furnace production equipment on duty inspections found in the equipment inspection, indicating high carbon potential, the set value of 1.0%, the actual indication of more than 1.3%, and there Gradually increasing the trend, so the temperature control system, carbon potential control system and instillation system made a check, temperature control computer display temperature 920 ℃ consistent with the set temperature; oxygen probe resistance 1.5kΩ, the output mV value is high ; Drip solenoid valve off flexible, no leakage when the valve is off, drip pipe, the pressure is normal. Considered to be too much oxygen probe carbon deposition, made of carbon treatment, did not cause enough attention. Found after checking the workpiece baked, serious serious infiltration layer, process requirements