THICK STEEL PLATE FOR PRESSURE VESSEL EXCELLENT IN SOHIC RESISTANCE IN WET H2S ENVIRONMENT

摘要

PURPOSE: To produce a thick steel plate for pressure vessel excellent in SOHIC resistance in a wet H₂S environment. ;CONSTITUTION: This steel plate has a composition which consists of, by weight, 0.08-0.25% C, 0.1-0.5% Si, 0.3-1.6% Mn, 0.02-0.6% Cr, 0.02-0.3% Mo, 0.005-0.050% Al, 5-80ppm Ca, 20-100ppm N, 0.015% P, 0.005% S, and the balance Fe with inevitable impurities or further contains one or two kinds selected from the strength improving element group consisting of 0.01-0.05% V and 0.005-0.05% Nb and in which the value of (Cr+Mo)/Mn is regulated to 0.2-0.7.;COPYRIGHT: (C)1995,JPO