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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Microalloy Design and Weld Joint Properties of ERW Linepipe via TSC
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Microalloy Design and Weld Joint Properties of ERW Linepipe via TSC

机译：基于TSC的ERW管道的微合金设计和焊接接头性能

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摘要

The present paper discribes a difference between Nb-based low nitrogen steel (Nb-LN) for ERW linepipe and V-based high nitrogen steel (V-HN) for the same application. Two typical microalloy designs, 0.06%Nb-30ppmN and 0.11%V-170ppmN with a base chemistry of 0.06%C-1.6%Mn are compared. Despite the half concentration of Nb compared to V, the strength of Nb-LN exceeded the level of X70, where as the V-HN remained in the strength bracket of X65. The notch toughness of Nb-LN exhibited the level of the Frigid Zone application (-90°C FATT, via 2/3 sub-size Charpy specimen), while V-HN, a little higher than -70°C FATT. Also the mechanical properties of ERW joint of both steels are compared. It should be noted the maximum hardness of V-HN exceeded 250Hv, whereas Nb-LN, below 238Hv. The metallurgical reason for the difference coincides well with the result of TEM observation.
机译：本文描述了用于ERW管线管的Nb基低氮钢（Nb-LN）与相同应用的V基高氮钢（V-HN）之间的区别。比较了两种典型的微合金设计，即0.06％Nb-30ppmN和0.11％V-170ppmN，其基本化学成分为0.06％C-1.6％Mn。尽管Nb的浓度是V的一半，但Nb-LN的强度却超过了X70的水平，而V-HN仍保持在X65的强度范围内。 Nb-LN的缺口韧性显示出在“寒带”应用中的水平（通过2/3次尺寸的夏比试样，-90°C FATT），而V-HN略高于-70°C FATT。还比较了两种钢的ERW接头的机械性能。应当指出，V-HN的最大硬度超过250Hv，而Nb-LN的最大硬度低于238Hv。差异的冶金学原因与TEM观察的结果非常吻合。

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