管材中N含量偏高对焊缝韧性的影响  

Effects of High Content of N in Pipe Material on Weld Toughness

作　　者：潘家华[1] 

机构地区：[1]中国石油天然气总公司管道局

出　　处：《焊管》1996年第2期24-25,共2页Welded Pipe and Tube

摘　　要：生产管线用的热轧卷板中，有些国外卷板由于在冶炼过程中无真空脱气设备，故Ｎ含量比我方定货技术条件要求的高，我方规定：Ｎ≤０．００９％，外方某厂：Ｎ≤０．０１４％。母材Ｎ含量偏高造成焊缝金属中Ｎ含量偏高，使焊缝金属中的Ｔｉ偏离Ｔｏｐ，焊缝的夏比冲击值偏低，ＦＡＴＴ值偏高。所以，要求生产管线管用热轧卷板Ｎ含量必须在规定范围内。In the foreign hot -rolled strip steel for welded steel pipeline materials, the content of N higher thanthat of the ordered technical conditions in assignmentas the result of not being removed of gas in vacuumequipment. We limit N content ≤0. 009% and some foreign companies limit N content ≤0. 014%. The higher N content of base metal caused the higher N content of weld metal, and made the Ti content deviate fromthe top and Cvnotch impact lower and FATT higher. For this reason, the N content of hot-rolled strip steelfor welding pipeline must be in the acceptable region.

关 键 词：管道 钢管 韧性 氮含量 焊缝 

分 类 号：TG441.7[金属学及工艺—焊接] TG457.6