Production Practice of Hydrogen-induced Cracking Resistant High-strength X65 Pipeline Steel
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摘要: 通过转炉双渣法脱磷、转炉出钢过程钢包渣改性、中间包使用双层高碱度覆盖剂、LF炉炉渣组成控制、密封圈Ar保护浇铸等技术的实施，在入转炉铁水[S]平均0.033%（范围0.028%~0.039%）、[P]平均0.133%（范围0.129%~0.138%）条件下，成功试制X65管线钢管。铸坯平均[N]0.003 5%，T[O]0.001 4%，[S]0.002 3%，[P]0.009 8%，夹杂物评级0.5级以内，铸坯夹杂物总量为0.004 4%，钢中夹杂物呈球状分布，尺寸小，数量少。铸坯内部质量达到了较好控制水平。试制钢管的力学性能均达到预期效果，完全满足标准要求和用户需求。Abstract: With average [S] of 0.033%(in the range of 0.028%~0.039%),and average [P] of 0.133%(in the range of 0.129%~0.138%) in molten iron to be fed into converter,X65 pipeline steel was successfully produced through dephosphorization by double slag process in converter,modification of ladle slag during tapping,application of double-deck high alkalinity covering agent in tundish,control of LF slag composition,and casting protection with argon.The average [N],T and [P] in the strands were controlled at 0.0035%,0.001 4%,0.002 3%,and 0.009 8% respectively.Inclusions in the strand were rated below 0.5 with total amounts of 0.004 4%.These globular inclusions were small in size and number,exhibiting satisfied internal quality.The mechanical properties of the trial-produced steel achieved the desired effect,and could fully meet the requirements of standards and users.
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