High tensile steel having excellent fatigue strength at its weld and weldability and process for producing the same
US5634988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Apr 4, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12958
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to a high tensile welded steel plate consisting essentially of, by weight, C: 0.03 to 0.20%, Si: 0.6 to 2.0%, Mn: 0.6 to 2.0%, Al: 0.01 to 0.08%, B: not more than 0.0020%, and N: 0.002 to 0.008% and optionally at least one element selected from Cu, Mo, Ni, Cr, Nb, V, Ti, Ca, and REM with the balance consisting of Fe and unavoidable impurities, and a process for producing a high tensile welded steel plate, usually comprising the steps of: subjecting a slab comprising the above chemical compositions to hot rolling or alternatively hot rolling followed by controlled rolling. The present invention enables fatigue cracking of the as-welded steel, in its heat-affected zone, to be prevented and, at the same time, the propagation of the crack to be prevented or inhibited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.