Steel Hardening in Los Angeles CA: Nitriding
You may only need to harden your base metal. Occasionally, the nature of wear is just not tribological. It may then be irrelevant using dry lubrication, low friction coatings. To achieve resistance to abrasion here, heating treating and hardening techniques like carburizing and nitriding are used. In comparison, they result in thin films or dimensional growth that is negligible.
In this technique, special makeup ferrous alloys which are under particular temperature-time conditions, are put together with a material of nitrogenous nature. It then absorbs the nitrogen, without quenching, resulting in case depth hardness.
The greatest alloying elements for nitriding steel are chromium, and aluminum, molybdenum, with aluminum being the most powerful nitride former. The process of stainless steel nitriding can results about 64 to 70 Rockwell C, although there will be a reduction in corrosion resistance.
Nitroalloys is the name used to refer to nitrides-forming alloys. They exist in a number of types with varying compositions as follows: aluminum-0. 85 to 11. 2%, carbon-0. 20 to 0. 45%, chromium-0 to1. 8%, molybdenum-0. 15 to 1. 00%, managanese-0. 4 to 0. 7%, silicon-0. 2 to 0. 4%. The end result is improved wear resistance, fatigue life, surface hardness, and corrosion resistance to some extent (with an exception for stainless steel).
For deep cases with gas nitriding especially, the process may need some time, but the risks of surface distortion are minimal. Generally, actual dimensional increase doesn’t surpass 0. 001-0. 02 inch.
According to the steel, it is quite possible to achieve hardness 50 to 65 Rockwell C, along with 0. 030 case depths. The minimal anneal temperatures should be 50 degrees Fahrenheit above the temperature of nitride. Liquid, gas, and plasma nitriding are the primary processes used.
Liquid nitriding (salt bath nitriding) needs using molten salt baths. The average temps range from 950 to 10750F. In this process, the supply of the nitrogen comes from the salts containing cyanates or cyanides. Some of the advantages of this method include plain carbon steels hardening capability, and small distortion.
In plasma nitriding (ion nitriding), the anode is the vacuum chamber, while the cathode is the work load that is isolated from the chamber. A controlled gas amount is usually introduced, and a direct current potential is determined, where particles of nitrogen which are positively charged diffuse and bombard surfaces, mixing with the alloying elements. Shorter processing time, environmentally sound, and effectiveness are some of the pros of this process.
Carbonitriding resembles cyaniding, only that nitrogen and carbon are simultaneously absorbed by heating in a gaseous atmosphere. The common temperatures are between 1450 and 16500F, and unless there’s distortion threat, quenching is normally performed to minimize potential of impact strength loss or becoming too brittle.
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