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| Patents for C21D 6 - Heat treatment of ferrous alloys (4,815) |
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| 05/17/1977 | US4023988 Heat treatment for ball bearing steel to improve resistance to rolling contact fatigue | | 05/03/1977 | US4021272 Method of isothermal annealing of band steels for tools and razor blades | | 01/18/1977 | US4003769 Method of making non-retentive Al-Ni-Co-Fe alloy | | 01/18/1977 | US4003768 Method for treating magnetic alloy to increase the magnetic permeability | | 11/02/1976 | US3989553 Drawing a blank into a cylinder, squeezing, aging | | 10/12/1976 | US3985582 Solidification | | 07/13/1976 | US3969158 Heat treatment | | 06/01/1976 | US3960617 Method of producing metal parts having magnetic and non-magnetic portions | | 06/01/1976 | US3960612 Method for producing a low temperature high strength tough steel | | 05/04/1976 | US3954509 Method of producing low expansion alloys | | 04/27/1976 | US3953252 Method of manufacturing metal articles having magnetic and non-magnetic areas | | 04/20/1976 | US3951697 Superplastic ultra high carbon steel | | 03/30/1976 | US3947293 Method for producing high-strength cold rolled steel sheet | | 03/09/1976 | US3943010 Manganese-chromium-iron-nitrogen | | 02/24/1976 | US3940267 Austenitic heat resisting steel |
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