| 摘要 |
PURPOSE:To improve the high-temperature and corrosion resistance of a stainless steel pipe on the vicinity of a weld zone by forming the weld zone with 'Inconel(R)', and forming a chromized layer on the surface of the stainless steel pipe of the vicinity of the weld zone, when welding a Cr-Mo steel pipe and an austenite stainless steel pipe. CONSTITUTION:When welding each dissimilar metal of a Cr-Mo steel pipe 1 and an austenite compound stainless steel pipe 2, etc., a weld zone 7 is formed by 'Inconel(R)' of an Ni-Cr-Fe compound, the inside and outside surfaces of the stainless steel pipe 2 within a range L of 100-200mm are brought to chrome diffusing and infiltrating treatment, and a chromized layer 6 of 80-120mum is formed. Or between the Cr-Mo steel pipe 1 and the stainless steel pipe 2, a transition piece 8 whose material quality is the same kind as that of the stainless steel pipe 2, and which has the chromized layer 6 on the inside and outside surface is interposed, and weld zones 9, 10 are welded by 'Inconel(R)'. In this way, the high temperature and corrosion resistance of the stainless steel pipe 2 on the vicinity of the weld zone is improved remarkably. |
