| 摘要 |
PURPOSE:To manufacture easily a long-sized heat resistant seamless cast steel pipe of a small diameter by milling the inside and outside of a centrifugally cast pipe of a heat resistant Ni-Cr steel, and reducing the diameter of the pipe by cold rolling under specified conditions. CONSTITUTION:The inside and outside of a centrifugally cast pipe of a heat resistant cast steel contg. 0.05-0.25% C, <2.0% Si, <2.0% Mn, 19.0-27.0% Cr, 30.0-40.0% Ni, 0.2-2.0% Nb and <0.1% N as a rough pipe are milled, and the diameter of the pipe is reduced by cold rolling at 40-60% reduction of area and <30% reduction of diameter. A long-sized heat resistant seamless cast steel pipe of a small diameter can be manufactured. |
