HOT ROLLED STEEL SHEET FOR OIL-WELL PIPE WITH EXCELLENT CRUSHING RESISTANCE, MANUFACTURING METHOD OF HOT ROLLED STEEL SHEET, AND HIGH-STRENGTH STEEL PIPE MANUFACTURED BY METHOD

摘要

The present invention provides a steel pipe and a hot rolled steel sheet for an oil-well pipe having excellent crushing resistance without thermal treatment after manufacturing the pipe, excellent yield strength, and excellent tensile strength. The present invention comprises: 0.3-0.4 wt% of C; 0.05-0.5 wt% of Si; 1.0-2.5 wt% of Mn; 0.02 wt% or less of P; 0.01 wt% or less of S; 0.001-0.006 wt% of Ca; 0.01-0.06 wt% of Al; 0.008 wt% or less of N; 0.1-0.5 wt% of Cr; and the remainder consisting of Fe and unavoidable impurities.;COPYRIGHT KIPO 2016