Process for the manufacture of seamless pressure vessels and its

Details Process for the manufacture of seamless pressure vessels and its Process for the manufacture of seamless pressure vessels and its

1989-10-30

1991-07-09

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 127R, 148320, 148334, C21D 810

Patent

active

050302973

ABSTRACT:
A process for the manufacture of a seamless pressure vessel and the seamless pressure vessel produced thereby, the process including the steps of employing an aluminum-killed CrMo steel which includes by wt. %: 0.28-0.39% C; 0.15-0.40% Si; 0.45-0.90% Mn; max. 0.02% P; max. 0.005% S; 0.90-1.30% Cr; 0.15-0.35% Mo; 0.0010-0.040% Ti; 0.001-0.003% B; and 0.003-0.010% N; hot working the alumninum-killed CrMo Steel to produce the seamless pressure vessel, austenizing the seamless pressure vessel at a temperature between about 830.degree. C. and about 880.degree. C.; cooling the seamless pressure vessel at a cooling rate of between about 5.degree. K/s and about 15.degree. K/s; and tempering the seamless pressure vessel at a temperature between about 510.degree. C. and about 660.degree. C.

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