Patent ID: 9121088
Filing Date: 2015-09-01
Classification: C21D,C22C

Abstract:
1. An iron-base alloy having hardness greater than 550HBN and favorable multi-hit ballistic resistance, the alloy comprising, in weight percentages based on total alloy weight: 0.48 to 0.52 carbon; 0.15 to 1.00 manganese; 0.15 to 0.45 silicon; 0.95 to 1.70 chromium; 3.30 to 4.30 nickel; 0.35 to 0.65 molybdenum; 0.0008 to 0.0030 boron; 0.001 to 0.015 cerium; 0.001 to 0.015 lanthanum; no greater than 0.002 sulfur; no greater than 0.015 phosphorus; no greater than 0.10 nitrogen; iron; and incidental impurities; wherein the iron-base alloy is cooled from an austenitizing temperature to room temperature in still air, wherein a plate of the iron-base alloy is stacked in contact with at least one adjacent plate of the iron-base alloy during the cooling, and wherein the iron-base alloy has a V