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5798002 |
In order to produce a carbon solid solution or carbide-containing surface layer on a substrate, the substrate is immersed into a cold bath of liquid active medium, and heated inside the liquid active medium by heating means immersed in t...
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4591397 |
A non-cyanide molten salt bath composition and process for the carburization of objects made of ferrous metals or alloys are provided. The composition comprises a molten salt mixture, at a temperature in the range of 900° C. to 1050° C...
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4461655 |
A non-cyanide salt composition for use in a fused-salt metal heat treatment bath for carburizing steel contains, as its cations, on the basis of total moles of cations 23 mole % potassium, 41/2% lithium, and the balance substantially sod...
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4268323 |
A process for case hardening steel is described. A fused bath of inert salt is maintained which bath is comprised of alkali or alkali earth halides, and alkali, or alkaline earth oxides or carbonates. To this fused bath is added urea, di...
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4153481 |
A cyanide-free molten salt carburizing process and composition comprising an alkali metal salt bath having a cover of finely divided graphite particles in a size range of about 100 mesh to about 300 mesh. The bath is operated in the temp...
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3922181 |
A method of hardening hypereutectoid steels having less than about 10 percent total alloy content is described which results in a structure with an ultra-fine grain size (finer than ASTM No. 10) and a natural dispersion of very small exc...
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3876512 |
A carburizing process consisting of using the object to be carburized as a cathode and inserting the cathode into an electrolytic bath including a melted metallic salt in which the anode is graphite.
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3635768 |
Carburizing of metals is effected by using molten cyanide baths containing activators. In the operation of such baths, due to consumption of the cyanide, it is necessary to add replenishing materials. The replenishing material is a mixtu...
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