Process for manufacturing iron-carbon-maganese austenitic steel sheet with excellent resistance to delayed cracking
US10006099B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 18, 2015 |
| Grant date | Jun 26, 2018 |
| Priority date | — |
| Expiry date | Sep 18, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12799
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for fabricating a steel sheet is provided. The process includes soaking a steel sheet. The steel has a composition including iron, carbon, manganese, silicon, aluminum, sulfur, phosphorus and nitrogen and at least one metallic element X chosen among vanadium, titanium, niobium, molybdenum, and chromium. A quantity Xp of metallic element under the form of carbides, nitrides or carbonitrides is, by weight: 0.030%≤Vp≤0.40%;0.030%≤Tip≤0.50%;0.040%≤Nbp≤0.40%;0.14%≤Mop≤0.44%; or0.070%≤Crp≤0.6%. The soaking step occurs under a pure nitrogen or argon atmosphere with a dew point lower than −30° C. at a soaking temperature θ between 250 and 900° C. and with a dynamic circulation of a regenerated atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.