The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 10, 2020
Filed:
Nov. 03, 2016
Posco, Pohang-si, KR;
Soon-Taik Hong, Pohang-si, KR;
POSCO, Gyeongsangbuk-do, KR;
Abstract
The present disclosure relates to a middle high temperature pressure vessel steel plate having excellent resistance against a post weld heat treatment (PWHT) and a manufacturing method therefor. The pressure vessel steel plate includes 0.05 to 0.17 wt % of C, 0.50 to 1.00 wt % of Si, 0.3 to 0.8 wt % of Mn, 1.0 to 1.5 wt % of Cr, 0.3 to 1.0 wt % of Mo, 0.003 to 0.30 wt % of Ni, 0.003 to 0.30 wt % of Cu, 0.005 to 0.06 wt % of Sol.Al, 0.015 wt % or less of P, and 0.020 wt % or less of S; additionally two or more elements selected from 0.002 to 0.025 wt % of Nb, 0.002 to 0.03 wt % of V, and 0.002 to 0.15 wt % of Co; and Fe and unavoidable impurities as the reminder, wherein a microstructure of a central portion of the steel plate is formed in a mixed structure of 20 area % or more of tempered martensite and the residue bainite.