Bar product, cylinder rods, hydraulic cylinders, and method for manufacturing
US6395109B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2000 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Feb 15, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2261/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A bar product prepared from microalloyed bar steel is provided. The bar product is prepared by hot rolling and heat treating a microalloyed bar steel. The hot rolled and heat treated microalloyed bar steel is prepared by steps of hot rolling a preform of the microalloyed bar steel at a temperature of between about 1,400° F. and about 2,200° F. to provide a steel bar having a diameter of between about ¾ inch and about four inches, cooling the steel bar to provide a surface temperature of below about 1,100° F., and heat treating the steel bar in an environment having a temperature of between about 500° F. and about 1,300° F. The bar product is preferably prepared without a step of cold drawing. In particular, the bar product is preferably prepared without a step of drawing to provide a 10% to a 35% reduction. The bar product having a diameter of between about ¾ inch and about four inches can be characterized as having a tensile strength of greater than about 105 ksi, a yield strength of greater than about 90 ksi, and elongation in two inches of greater than about 7%, and a reduction of area of greater than about 20%. The invention relates to cylinder…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.