High - Strength Stainless Steel for Oil Well Pipe and high - Strength Stainless Steel for Oil Well

摘要

Provides a high - Strength Stainless Steel for oil wells with excellent Corrosion in environments with high temperature resistance, excellent SSC at room temperature and with an improved workability with respect to 13% Cr steels.The Stainless Steel of high resistance to Oil Well agree with this request has a chemical composition that contains, as a percentage of the Mass, C: at most 0.05% if: at least 1.0%, MN: at most 0.3%, P: at most 0.05% s: less CR: more than 0.002%, 16% and the sum Or 18%, MO: 1.5 to 3.0%, 1.0 to 3.5%, cu: ni: 3.5 to 6.5%, 0.001 to 0.1% N: 0.025% at best,And: 0.01% or at most, Balanced with Faith and Impurities, a microstructure comprising a martensitic phase, between 10% to 48.5% of a Ferritic Phase Volumetric ratio and taken in at most 10% retained austenite Phase taken in a Volumetric ratio, with a Limit elu00e1stic Or at least 758 MPa and uniform elongation of at least 10%.