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GCr15钢穿管坯料加热到1200℃后,分别以钼顶头(钼钛锆合金)和普通顶头(20CrNi3A钢)以6°～6.5°轧辊倾角和143rpm轧辊转数穿管。钼顶头穿管前予热至850～950℃,普通顶头不予热。穿管后在管材的头、中、尾(不对应于钢锭的头、中、尾部)各间隔不少于1m处截取切片,以1:1盐酸水溶液热蚀后发现,在该温度下,无论用那种材料的顶头穿管,均有不同程度的低倍缺陷存在,但尾部比头部严重,钼
After being heated to 1200 ° C, the GCr15 steel tube blank was pierced with 6 ° -6.5 ° roll inclination and 143 rpm roll rotation with molybdenum head (molybdenum-titanium-zirconium alloy) and common head (20CrNi3A steel) respectively. Molybdenum head to wear before the heat to 850 ~ 950 ℃, the general head is not hot. After the tube is cut, the sections of the head, middle and tail of the tube (which do not correspond to the head, the middle and the tail of the ingot) are cut at intervals of not less than 1 m. After the tube is thermally etched with a 1: 1 hydrochloric acid aqueous solution, With the material of the head wear tube, there are varying degrees of low magnification defects exist, but the tail than the head serious, molybdenum