采用2.25Cr-1Mo-V-Cb-Ca钢的加氢反应器的制造

2.25Cr-1Mo-V-Cb-Ca和3Cr-1Mo-V-Cb-Ca钢已经作为高温高压加氢反应器的材料被发展起来了,这些Cr-Mo-V-Cb-Ca钢由于加了V在高温下有着很高的强度,同时附加的大约0.25％的V还能显著提高高温下抗氢蚀和抗氢脆的能力,附加的Ca也是这种材料独有的特征,它能有效降低焊件热影响区产生再热裂纹的可能性,另外通过附加的V还能减少焊件再热裂纹的灵敏度。虽然采用3Cr-1Mo-V-Cb-Ca钢的加氢反应器已经制造成功了,但本文讨论的是第一次采用2.25Cr-1Mo-V-Cb-Ca钢来制造加氢反应器,而且和ASME规范实例2098比较,我们还取得了这种材料的大量的性能数据。另外,对于传统的探伤技术,我们引荐了一种飞行时间衍射(Time-of-Flight Diffraction)(TOFD)技术来对焊件进行超声波探伤,进一步保证了检测手段的可靠性。

Fabrication of a Hydroprocessing Reaction Applying 2.25Cr-1Mo-V-Cb-Ca Steel

2.25Cr-1Mo-V-Cb-Ca and 3Cr-1Mo-V-Cb-Ca steels have been developed as materials for high temperature and high pressure hydroprocessing reactors. These Cr-Mo-V-Cb-Ca steels have high strength at elevated temperature due to the vanadium. The addition of vanadium of more than 0. 25% also markedly improves the resistance against high temperature hydrogen attack and hydrogen embrittlement. Calcium addition, which is a unique feature of this material, effectively reduces the weldment of which susceptibility is otherwise impared by vanadium addition.While hydrocracking reactors have been made of the 3Cr-1Mo-V-Cb-Ca material, this paper discussesd the first use of the 2. 25Cr-1Mo-V-Cb-Ca material for a hydroprocessing reactor.We also report the material properties commercially achieved relative to the ASME Code Case 2098 for the material. In addition to conventional inspection technique, time-of-flight diffraction (TOFD) ultrasonic inspection of welds seams was conducted and confirmed the quality of the welds.