论文部分内容阅读
一、概况宝钢RH装置在1985年11月23日～1988年4月30日,共计处理2289炉次,处理量约68.8×10~4t,钢种66个。按照新日铁和曼内斯曼企业标准检验合格率达到99％以上,钢管钢坯夹杂物级别k_4值按规定≤60,实际平均值为7.94,k_4≤30的试片占90.7％。塔形无发纹率为34.9％。另外,通过超声波探伤对比试验,发现经RH处理的钢探伤合格率由43.6％提高到82.1％。经过RH本处理的钢液,可使[H]<1.8ppm,[N]<5.ppm,[O]_(自由)<10ppm,脱氢率约64％,脱氧率约49％,脱氮率16％左右。RH OB法精炼低碳铝镇静
I. Overview Baosteel RH plant in November 23, 1985 ~ April 30, 1988, a total of 2289 heat treatment, handling capacity of about 68.8 × 10 ~ 4t, 66 kinds of steel. In accordance with the Nippon Steel and Mannesmann enterprise standard test pass rate of 99% or more, steel billet inclusions level k_4 value required by the provisions of ≤ 60, the actual average of 7.94, k_4 ≤ 30 specimens accounted for 90.7%. Tower without hair pattern rate was 34.9%. In addition, through the ultrasonic flaw detection test, found that RH treated steel flaw detection pass rate increased from 43.6% to 82.1%. After the treatment of molten steel by RH, [H] <1.8ppm, [N] <5.ppm, [O] _ (free) <10ppm, dehydrogenation rate of about 64%, about 49% deoxygenation rate, About 16% rate. RH OB refining low-carbon aluminum calm