Metal treatment – Compositions – Heat treating
Patent
1978-05-22
1979-10-16
Steiner, Arthur J.
Metal treatment
Compositions
Heat treating
75123B, 75123N, 75123J, 75123K, 75124, 75128F, C04B 3570
Patent
active
041712331
ABSTRACT:
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 steel 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 0.3 to 0.8%, and the maximum quantities of manganese 3.0%, phosphorus 0.025%, sulfur 0.025%, silicon 2.0%, nickel 4.0%, cobalt 4.0%, chromium 3.0%, vanadium 1.0%, molybdenum 1.5%, tungsten 1.5%, niobium 0.1%, titanium 0.5%, aluminum 0.10%, optionally boron between 0.0005 and 0.012%, balance iron, the desired polishability can be achieved through adherence to the equation:
REFERENCES:
patent: 2861908 (1958-11-01), Mickelson et al.
patent: 2863763 (1958-12-01), Rosenberg et al.
patent: 2919188 (1959-12-01), Furgason
patent: 3574602 (1971-04-01), Gondo et al.
patent: 3689329 (1972-09-01), Kern
patent: 3912553 (1975-10-01), Waid et al.
patent: 3928025 (1975-12-01), Okuno et al.
patent: 4082577 (1978-04-01), Heller
"Constitution of Binary Alloys," Hanson, 1958, pp. 353-365.
"Stahlschlussel" 10th Ed., 1974, p. 182.
Bethlehem Steel Corporation
Noll William B.
O'Keefe Joseph J.
Steiner Arthur J.
LandOfFree
Lens quality of die steel does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lens quality of die steel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens quality of die steel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-803929