| Patent Number |
Title Of Patent |
Date Issued |
| 4713122 |
Production of thin flat articles with hardened surfaces |
December 15, 1987 |
| Thin metal articles of pre-determined shape are given a first treatment to provide a hardened surface and a second treatment to correct distortion caused by the hardening treatment. The hardening is provided an epsilon nitride layer and the corrective treatment is a heat treatment at |
| 4710238 |
Making of steel component |
December 1, 1987 |
| A component formed of interstitial free steel is heated in a gaseous atmosphere containing 15% by volume of a nitrogen doner, e.g. ammonia, at about 500.degree. C. to about 740.degree. C. for about 30 minutes to about 4 hours to form an epsilon iron nitride surface layer, and a layer of |
| 4596611 |
Corrosion resistant steel components and method of manufacture thereof |
June 24, 1986 |
| A non-alloy steel component is nitrocarburized at 550.degree. to 720.degree. C. for up to 4 hours in a nitriding gaseous atmosphere e.g. ammonia or ammonia and endothermic or exothermic gas, and is thus exposed to air or other oxidizing atmosphere for 2 to 120 seconds to form an oxid |
| 4563223 |
Corrosion resistant steel components and method of manufacture thereof |
January 7, 1986 |
| To impart good salt spray corrosion resistance to alloy steel components, such components are gas nitrocarburized at 550.degree. C. to 800.degree. C. to produce an epsilon layer, oxidized to produce an Fe.sub.3 O.sub.4 layer not more than 1 micrometer thick, quenched into an oil/water |
| 4496401 |
Corrosion resistant steel components and method of manufacture thereof |
January 29, 1985 |
| A non-alloy steel component is nitrocarburized at 550.degree. to 720.degree. C. for up to 4 hours in a nitriding gaseous atmosphere eg. ammonia or ammonia and endothermic or exothermic gas, and is thus exposed to air or other oxidizing atmosphere for 2 to 120 seconds to form an oxide |
