Corrosion and wear resistant alloy
AssigneeL. E. Jones Company
InventorsCong Yue Qiao, Todd Trudeau
Life of this patent
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Abstract
An iron-based corrosion resistant and wear resistant alloy. The alloy can comprise (in weight percent) 0.005-0.5% boron, 1.2-1.8% carbon, 0.7-1.5% vanadium, 7-11% chromium, 1-3.5% niobium, 6-11% molybdenum, and the balance including iron and incidental impurities. Alternatively, the Nb content can be replaced or combined with Ti, Zr, Hf and/or Ta such that 1%<(Ti+Zr+Nb+Hf+Ta)≦3.5. The alloy has improved hot hardness and high temperature compressive strength and is suitable for use in elevated temperature applications such as in diesel valve seat inserts.
Claims36
An iron-based alloy having a martensitic microstructure including primary and secondary carbides comprising, in weight percent:
- boron from about 0.005 to 0.5%;
- carbon from about 1.2 to 1.8%;
- vanadium from about 0.7 to 1.5%;
- chromium from about 7 to 11%;
- niobium from about 1 to 3.5%;
- molybdenum from about 6 to 11%, and the balance including iron and incidental impurities.
A cast iron-based tungsten-free alloy having a martensitic microstructure including primary and secondary carbides comprising, in weight percent:
- boron from about 0.1 to 0.3%;
- carbon from about 1.4 to 1.8%;
- silicon from about 0.7 to 1.3%, vanadium from about 0.8 to 1.5%;
- chromium from about 9 to 11%;
- manganese from about 0.2 to 0.7%;
- cobalt from about 0 to 4%;
- nickel from about 0 to 2%;
- niobium from about 1 to 2.5%;
- molybdenum from about 8 to 10%, and the balance including iron and incidental impurities.
A method of making an iron-based alloy comprising. in weight percent:
- boron from about 0.005 to 0.5%;
- carbon from about 1.2 to 1.8%;
- vanadium from about 0.7 to 1.5%;
- chromium from about 7 to 11%;
- niobium from about 1 to 3.5%;
- molybdenum from about 6 to 11%, and the balance including iron and incidental impurities, wherein the alloy is cast from a melt at a temperature of from about 2800 to 3000° F.
A method of making an iron-based alloy comprising. in weight percent:
- boron from about 0.005 to 0.5%;
- carbon from about 1.2 to 1.8%;
- vanadium from about 0.7 to 1.5%;
- chromium from about 7 to 11%;
- niobium from about 1 to 3.5%;
- molybdenum from about 6 to 11%, and the balance including iron and incidental impurities, wherein the alloy is heated at a temperature of from about 1550 to 2100° F., quenched and tempered at a temperature of from about 1200 to 1400° F.
An iron-based alloy having a martensitic microstructure including primary and secondary carbides comprising, in weight percent:
- about 0.005 to 0.5% boron;
- about 1.2 to 1.8% carbon;
- about 0.7 to 1.5% vanadium;
- about 7 to 11% chromium;
- about 6 to 11% molybdenum;
- at least one element selected from the group consisting of titanium, zirconium, niobium, hafnium and tantalum, represented by Ti, Zr, Nb, Hf and Ta, respectively, and the balance including iron and incidental impurities, such that 1%<(Ti+Zr+Nb+Hf+Ta)<3.5%.
Dependencies are inferred from the claim text.