Resistance sulfide stress crack Characteristic and the high intensity stainless steel metal tubing which is superior in resistance hot carbon dioxide corrosion

摘要

Mass % with, C: 0.05% or less, Si: 1.0% or less, P: 0.05% or less, S: Under 0.002%, Cr: It exceeds 16%, 18% or less, Mo: It exceeds 2%, 3% or less, Cu: 1% - 3.5%, Ni: Under 5% of 3% or more, Al: 0.001% - 0.1%, O: 0.01% or less, furthermore, Mn: 1% or less, N: In the field of 0.05% or less, Mn and N fill up formula (1), the high intensity stainless steel metal tubing where the remainder consists of Fe and the impurity, as for metal texture in cubic measure amount factor includes the residual gamma-phase of 10% or less in 10 - 40% ferrite phases and cubic measure amount factor martensite phase as an entity. This high intensity stainless steel metal tubing under hot carbon dioxide environment has the resistance sulfide stress crack Characteristic which is superior in the sufficient corrosion-resistant possessing and normal temperature.[Mn] ([N] 0.0045) 0.001 (1)However, formula (1) as for the element symbol in, the content in the steel of each element (the unit: Mass %) you display.