High-strength low-alloy steels
USRE28878E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1974 |
| Grant date | Jun 22, 1976 |
| Priority date | — |
| Expiry date | Nov 11, 1994 |
Classification
- Technology area (CPC —)General
Abstract
Fully killed high-strength low-alloy steels consisting essentially of .12% to .20% carbon, 1.10% to 1.65% manganese, .05% to .20% vanadium, .005% to .025% nitrogen, .04% maximum phosphorus, .025% maximum sulfur, .60% maximum silicon and balance iron are characterized in a hot-rolled finished condition by yield strengths in excess of 80,000 p.s.i., ultimate tensile strengths in excess of 95,000 p.s.i., ductilities as measured by percent elongation (2 inches) in excess of 18% and good toughness. The steels are hot-rolled finished in the temperature range 1550.degree. F. to 1650.degree. F., cooled at a rate within the range 20.degree. F. to 135.degree. F. per second and collected by coiling or piling within a temperature range of 1025.degree. F. to 1175.degree. F. The steels modified by the incorporation of .01% to .10% of a rare earth are further characterized by improved formability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.