The blooms heated in pusher heating furnace generlly hav e serious dark mark and nicking which make the elongation property of steel pla te become worse and the scars and nicking be formedon the surface of steel pl ate.

• 推钢式加热炉普遍存在着钢坯加热黑印较重,钢坯下表面被划伤造成钢板延伸性能不合格、板表面产生结疤、皮等质量缺陷。