J55

Meanwhile the specific ways to improve J55 welding pipe quality are put forward .

同时提出了提高J55焊管质量的具体途径。

The effect of on line normalization treatment on structure and properties of J55 steel tube was analyzed .

研究了在线常化工艺对J55钢管的组织和性能的影响。

This paper introduces chemical composition , structure , mechanical properties and manufacturing techniques of J55 oil pipe 's material .

本文介绍了J55油管材料的化学成分、组织、力学性能以及生产工艺技术。

The results showed that , the pearlite increased the mechanical properties of J55 steel , in which the content of pearlite increasing with that of carbon .

结果表明，珠光体含量随碳含量的增加而增加，进而提高了钢的力学性能；

In view of the trial-production of J55 hot-rolled coiled sheet for petroleum casing pipe , rolling process control and comprehensive quality of the products were analyzed .

针对J55石油套管热轧板卷的试制情况，重点从轧制过程控制、产品实物质量进行了分析。

The results showed that the hot-dip aluminizing coatings on both the J55 and N80 steels were composed of aluminum layer and Fe-Al intermetallic compound layer .

结果表明：J55和N80钢热浸镀铝后的镀层组织均可分为纯铝层和铁铝金属间化合物层两层；

The levels of inclusions and gas content in molten steel and slabs of J55 grade oil casings were researched when adopting two processes : LD-RH-LF-CC and LD-LF-CC respectively .

通过对比J55石油套管钢采用LD-RH-LF-CC和LD-LF-CC两条工艺路线钢中氧、氮、氢及夹杂物的控制水平，研究两条工艺路线钢中气体、夹杂物含量对产品性能的影响。