AR114619A1

AR114619A1 - STEEL MATERIAL SUITABLE FOR USE IN ACID ENVIRONMENT

Info

Publication number: AR114619A1
Application number: ARP190100791A
Authority: AR
Inventors: Keiichi Kondo; Hiroki Kamitani; Atsushi Soma; Shinji Yoshida; Yuji Arai
Original assignee: Nippon Steel & Sumitomo Metal Corp
Priority date: 2018-04-09
Filing date: 2019-03-27
Publication date: 2020-09-23

Abstract

Un material de acero que posee un límite elástico en un rango de 655 a 1069 MPa (95 a grado 140 ksi) y excelente resistencia SSC. El material de acero de acuerdo con la presente divulgación contiene una composición química que consiste de, en % de masa, C: 0.20 a 0.50%, Si: 0.05 a 0.50%, Mn: 0.05 a 1.00%, P 0.030% o menos, S: menos de 0.0050%, Al: 0.005 a 0.050%, Cr: 0.10 a 1.50%, Mo: 0.25 a 1.80%, Ti: 0.002 a 0.050%, Nb: 0.002 a 0.100%, B: 0.0001 a 0.0050%, N: 0.0070% o menos y O: menos de 0.0050% balanceado con Fe e impurezas. Un límite elástico se encuentra en un rango de 655 a 1069 MPa, y una relación de cedencia es de 85% o más. Una proporción de valores de KAM de 1º o menos es de 30% de área o más.A steel material that possesses a yield strength in a range of 655 to 1069 MPa (95 to 140 ksi) and excellent SSC strength. The steel material according to the present disclosure contains a chemical composition consisting of, in mass%, C: 0.20 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P 0.030% or less, S: less than 0.0050%, Al: 0.005 to 0.050%, Cr: 0.10 to 1.50%, Mo: 0.25 to 1.80%, Ti: 0.002 to 0.050%, Nb: 0.002 to 0.100%, B: 0.0001 to 0.0050%, N : 0.0070% or less and O: less than 0.0050% balanced with Fe and impurities. A yield strength is in the range of 655 to 1069 MPa, and a yield ratio is 85% or more. A ratio of KAM values of 1 ° or less is 30% area or more.