IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0908419
(1978-05-22)
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발명자
/ 주소 |
- Vander Voort George F. (Bethlehem PA)
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출원인 / 주소 |
- Bethlehem Steel Corporation (Bethlehem PA 02)
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인용정보 |
피인용 횟수 :
4 인용 특허 :
1 |
초록
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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 pro
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: Surface Roughness (m2+0.87(% Cr)+2.1(% V)+1.12 (% Mo)+0.84(% W)+14(% Nb)], where the calculated Surface Roughness is no greater than 2.65 m
대표청구항
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In a heat treated ferrous alloy, adapted for use as a die steel, where the heat treatment includes austenitizing, cooling and tempering, said alloy characterized in the heat treated condition by a hardness of at least 55 Rc and a charpy V-notch toughness of at least 6 ft-lbs., a high level of harden
In a heat treated ferrous alloy, adapted for use as a die steel, where the heat treatment includes austenitizing, cooling and tempering, said alloy characterized in the heat treated condition by a hardness of at least 55 Rc and a charpy V-notch toughness of at least 6 ft-lbs., a high level of hardenability, and the capability of achieving a high polished surface flatness, said alloy consisting essentially of, by weight, carbon between 0.4 to 0.7%, manganese between 1.1 to 2.2%, nickel between 1.0 to 1.7%, a maximum of 0.025% phosphorus, a maximum of 0.025% sulfur, a maximum of 2.0% silicon, a maximum of 0.1% niobium, a maximum of 0.5% titanium, a maximum of 4.0% cobalt, a maximum of 0.10% aluminum, balance iron, the improvement comprising in combination therewith the provision of improving the hardenability of said alloy by adding thereto at least one element 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 0.12%, provided that the addition of at least one said element to improve hardenability does not result in an increase in the austenitizing temperature above about 1700°F., and that the chemistry of said alloy is further adjusted to satisfy the equation: Surface Roughness (m7.07-12.5 (% C)+0.72 (% Mn)+0.45 (% Si)-2.9 (% Ni)+1.13 (% Ni)2+0.87 (% Cr)+2.1 (% V)+1.12 (% Mo)+0.84 (% W)+14 (% Nb)], where the calculated Surface Roughness is no greater than 2.65 m1.0 when boron is not present in the above given range, and 1.74 when boron is present.
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