Heat resisting ferritic stainless steel excellent in low temperature toughness, weldability and heat resistance
US5302214A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Nov 16, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/48
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A heat resisting ferritic stainless steel which comprises, by weight, up to 0.03% of C, from 0.1 to 0.8% of Si, from 0.6 to 2.0% of Mn, up to 0.006% of S, up to 4% of Ni, from 17.0 to 25.0% of Cr, from 0.2 to 0.8% of Nb, from 1.0 to 4.5% of Mo, from 0.1 to 2.5% of Cu, and up to 0.03% of N, and optionally one or more of appropriate amounts of Al, Ti, V, Zr, W, B and REM, the balance being Fe and unavoidable impurities, wherein the alloying elements are further adjusted so that the ratio of Mn%/S% is not less than 200, [Nb] defined by the equation: [Nb]=Nb%-8 (C%+N%) is not less than 0.2, and (Ni%+Cu%) is not more than 4. The stainless steel according to the invention is suitable for use in constructing an exhaust gas path-way of an automobile, particularly, a path-way from an engine to a converter, which is exposed to high temperatures, and which requires an improved low temperature toughness and a high resistance to weld cracking due to high temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.