Abstract:
PROBLEM TO BE SOLVED: To provide a ferrite-based stainless steel which resists against oxidation as an interconnection used in a solid oxide fuel cell.SOLUTION: An interconnection 10 is a metal material containing a ferrite-based stainless steel and having at least one via 20 for growing a scale containing manganese-chromate spinel in at least a part of the surface when exposed to an oxidative atmosphere under high temperature, and at least one gas flow channel 18 for growing an oxide scale rich in aluminum in at least a part of the surface when exposed to an oxidative atmosphere under high temperature.
Abstract:
PROBLEM TO BE SOLVED: To provide an austenitic stainless steel having lower nickel and molybdenum content and exhibiting comparable corrosion resistance and formability properties to alloys with higher nickel and molybdenum content.SOLUTION: The austenitic stainless steel comprises up to 0.20 wt.% of C, 2.0-9.0 wt.% of Mn, up to 2.0 wt.% of Si, 16.0-23.0 wt.% of Cr, 1.0-3.0 wt.% of Ni, up to 3.0 wt.% of Mo, 0.1-0.35 wt.% of N, up to 4.0 wt.% of W, up to 0.01 wt.% of B, up to 1.0 wt.% of Co, iron and impurities, the steel having a ferrite number of less than 10 and a MDvalue of less than 20°C.
Abstract:
A method of reducing the formation of electrically resistive scale on a an article comprising a silicon-containing ferritic stainless subjected to oxidizing conditions in service includes, prior to placing the article in service, subjecting the article to conditions under which silica, which includes silicon derived from the steel, forms on a surface of the steel. Optionally, at least a portion of the silica is removed from the surface to placing the article in service. A ferritic stainless steel alloy having a reduced tendency to form silica on at least a surface thereof also is provided. The steel includes a near-surface region that has been depleted of silicon relative to a remainder of the steel.
Abstract:
An austenitic stainless steel comprises, by weight, 9 to 23% chromium, 30 to 35% nickel, 1 to 6% molybdenum, 0 to 0.03% titanium, 0.15% to 0.6% aluminum, up to 0.1 carbon, 1 to 1.5% manganese, 0 to less than 0.8% silicon, 0.25 to 0.6% niobium and iron. Embodiments of austenitic stainless steels according to the present invention exhibit enhanced resistance to corrosion. Thus, the stainless steels of the present invention may find broad application as, for example, automotive components and, more particularly, as automotive exhaust system flexible connectors and other components, as well as in other applications in which corrosion resistance is desired.
Abstract:
Embodiments of an austenitic stainless steel include, in weight percentages based on total weight of the steel: 0.05 to 0.2 carbon; 0.08 to 0.2 nitrogen; 20 to 23 chromium; 25 to 27 nickel; 1 to 2 molybdenum; greater than 1.5 to 4.0 manganese; 0.20 to 0.75 niobium; up to 0.1 titanium; iron; and incidental impurities. Certain other embodiments of an austenitic stainless steel include, in weight percentages based on total weight of the steel: 0.05 to 0.2 carbon; 0.08 to 0.2 nitrogen; 20 to 23 chromium; 25 to 27 nickel; 1 to 2 molybdenum; up 4.0 manganese; 0.20 to 0.75 niobium; at least one of no greater than 0.1 titanium and no greater than 0.1 aluminum; iron; and incidental impurities.
Abstract:
An austenitic stainless steel composition having low nickel and molybdenum and exhibiting high corrosion resistance and good formability. The austenitic stainless steel includes, in weight %, up to 0.20 C, 2.0-6.0 Mn, up to 2.0 Si, 16.0-23.0 Cr, 5.0-7.0 Ni, up to 3.0 Mo, up to 3.0 Cu, 0.1-0.35 N, up to 4.0 W, up to 0.01 B, up to 1.0 Co, iron and impurities. The austenitic stainless steel has a ferrite number less than 11 and an MD30 value less than −10° C.
Abstract:
A method of reducing defect heights of iron mound defects on a mill glass coated electrical steel, comprises contacting at least a portion of a surface of a mill glass coated electrical steel with an acidic solution for a contacting time sufficient to reduce an average height of iron defects on the surface to an average height in a range of 0 percent to 150 percent of the thickness of the mill glass coating, without effectively removing the mill glass coating. After contacting, the acid contacted mill glass coated electrical steel is rinsed with water and dried.