Ultra-high strength metastable austenitic stainless steel containing Ti and a method of producing the same
US6440236B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2000 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Nov 2, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An ultra-high strength metastable austenitic stainless steel exhibiting a tensile strength of not less than 2200 N/mm2 has a chemical composition comprising, in mass %, not more than 0.15 % of C, more than 1.0 to 6.0 % of Si, not more than 5.0 % of Mn, 4.0-10.0 % of Ni, 12.0-18.0 % of Cr, not more than 3.5 % of Cu, not more than 5.0 % of Mo, not more than 0.02 % of N, 0.1-0.5 % of Ti, optionally one or both of not more than 0.5 % of V and not more than 0.5 % of Nb, and the balance of Fe and unavoidable impurities, satisfies Si+Mo≧3.5 %, has a value of Md(N) defined by the equation Md(N)=580-520C-2Si-16Mn-16Cr-23Ni-300N-26Cu-10Mo of 20-140, exhibits a cold worked multiphase texture composed of 50-95 vol % of martensite phase and the remainder substantially of austenite phase, and has Mo-system precipitates and Ti-system precipitates distributed in the martensite phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.