Low-alloy steel, clad with stainless steel by overlay welding and resisting delamination at the interface caused by hydrogen.

摘要

Reactor vessels for hydrogenation processes in the petrochemical industry are usually made of low-alloy steels, with a cladding of stainless steel formed by overlay welding. A frequently occurring problem is delamination at the interface, due to contact with hydrogen at high temperature and under high pressure. The high-strength steel of the invention does not suffer of this disadvantage: it contains, in weight percent : 0.05 to 0.30% carbon, up to 1.5% manganese, 0.8 to 5.5% chromium, 0.5 to 1.5% molybdenum, 0.0005 to 0.010% boron, 0.01 to 0.04% titanium and/or niobium, the balance being iron with incidental impurities.