LOW INTERSTITIAL 29 PERCENT CHROMIUM - 4 PERCENT MOLYBDENUM WELDABLE FERRITIC STAINLESS STEEL CONTAINING COLUMBIUM OR TITANIUM

摘要

LOW INTERSTITIAL 29% CHROMIUM - 4% MOLYBDENUM WELDABLE FERRITIC STAINLESS STEEL CONTAINING COLUMBIUM OR TITANIUM A low interstitial, corrosion resistant, weldable ferritic stainless steel has an addition of between 0.05% and 0.50% columbium or titanium to give the steel improved toughness when the maximum achievable cooling rate is limited. The steel consists essentially of the following composition by weight percent: between 25.0% and 35.0% chromium, between 3.6% and 5.6% molybdenum, between 0.05% and 0.50% of at least one element from the group consisting of columbium and titanium, less than 3.0% nickel, less than 2.0% manganese, less than 2.0% silicon, less than 0.5% aluminum, less than 0.5% copper, less than 0.050% phosphorus, less than 0.050% sulfur, less than 0.01% carbon, less than 0.02% nitrogen, the carbon plus nitrogen content being less than 0.025% and the balance iron.