| 摘要 |
<p>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 3/4 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 3/4 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 rods, hydraulic cylinders, methods for manufacturing cylinder rods and hydraulic cylinders.</p> |
