C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/117, 148/50
C22C 38/00 (2006.01) C22C 38/40 (2006.01) C22C 38/44 (2006.01) C22C 38/54 (2006.01)
Patent
CA 1149198
Abstract of the Disclosure A ferrous alloy for use as a die steel having high hardenability, high hardness, good toughness and capable of achieving a high polished surface flatness in the air or oil quenched and tempered condition. Such alloy is ideally suited as a die steel for lens quality and photo-etching applications. The unique combination of properties is accomplished through a careful balancing of the chemistry, particularly control of those elemental additions which promote segregation. Within the broad chemistry limits, by weight, of carbon between .4 to .75, manganese between 1.1 to 2.25, nickel between 1.0 and 1.75, maximum quantities of phosphorus 0.25%, sulfur .025%, silicon 2.0%, cobalt 4.0%, niobium .1%, titanium .5%, aluminum .10%, the further addition thereto of at least one element to improve harden- ability and selected from the group consisting of a maximum of 3.0% chromium, a maximum of 1.5% molybdenum, a maximum of 1.5% tungsten, a maximum of 1.0% vanadium, and boron between 0.0005 and 0.012%, with the balance iron, the desired polishability can be achieved through adherence to the equation: Surface Roughness (µ-inch) = Boron factor [7.07- 12.5 (% C) + .72 (% Mn) + .45 (% Si) - 2.9 (% Ni) + 1.13 (% Ni)2 + .87 (% Cr) + 2.1 (% V) + 1.12 (% Mo) + .84 (% W) + 14 (% Nb)], where the calculated Surface Roughness is no greater that 2.65 µ-inch. The Boron factor is 1.0 when boron is not present in the above given range, and 1.74 when boron is present.
327345
Bethlehem Steel Corporation
Smart & Biggar
LandOfFree
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