High-corrosion-resistant martensitic stainless steel having excellent weldability and process for producing the same
US5716465A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Aug 27, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high-corrosion-resistant martensitic stainless steel possessing excellent weldability and SSC resistance, having a tempered martensitic structure, characterized by comprising steel constituents satisfying by weight C: 0.005 to 0.035%, Si: not more than 0.50%, Mn: 0.1 to 1.0%, P: not more than 0.03%, S: not more than 0.005%, Mo: 1.0 to 3.0%, Cu: 1.0 to 4.0%, Ni: 1.5 to 5.0%, Al: not more than 0.06%, N: not more than 0.01%, and Cr satisfying a requirement represented by the formula 13>Cr+1.6Mo.gtoreq.8, EQU C+N.gtoreq.0.03, EQU 40C+34N+Ni+0.3Cu-1.1Cr-1.8 Mo.gtoreq.10, or further comprising at least one element selected from the group consisting of Ti: 0.05 to 0.1%, Zr: 0.01 to 0.2%, Ca: 0.001 to 0.02%, and REM: 0.003 to 0.4%, with the balance consisting essentially of Fe. A process for producing a martensitic stainless steel, comprising the steps of: subjecting a steel plate, produced by hot-rolling a stainless steel slab having the above composition, to austenitization at a temperature of Ac.sub.3 point to 1000.degree. C. to harden the steel plate; subjecting the hardened steel plate to final tempering at a temperature of 550.degree. C. to Ac.sub.1 point; and cold-rolling the stee…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.