Ultra-high strength weathering steel and method for making same
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United States of America Patent
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app pub date -
Nov 28, 2005
filing date -
Apr 8, 2003
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Abstract
An air-cast ultra-high strength weathering steel prepared by combining C, Si, Cr, Cu, Mo, Ni, Co, and Fe, wherein the steel has a yield strength of greater than about 230,000 psi, a tensile strength of greater than about 250,000 psi, and an elongation of greater than about 6 percent. In a preferred embodiment, the air-cast ultra-high strength weathering steel includes at least one ingredient selected from the group consisting of V, W, N and mixtures thereof In another preferred embodiment C is present in the range of from about 0.16 to 0.23 percent by weight, Si is present in the range of from about 0.2 to 1.5 percent by weight, Cr is present in the range of from about 2 to 5 percent by weight, Cu is present in the range of from about 0.2 to 2 percent by weight, Mo is present in the range of from about 0.8 to 3 percent by weight, Ni is present in the range of from about 7 to 12 percent by weight, Co is present in the range of from about 13 to 17 percent by weight; and Fe is present in a remaining amount.
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