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The nitriding treatment of coupling

Introduction:
Coupling involves a variety of heat treatment methods, common surface rust blackening, in order to change the overall hardness of steel and do tempering and hardening in order to increase the local hardness and so on, this is mainly about the use of nitriding treatment. Nitriding is the process of nitriding to the surface layer of steel. Currently, gas nitriding is widely used, that is, active nitrogen atoms decomposed by ammonia gas when heated infiltrate into steel. Nitriding temperature is usually in the range of 500-600℃, generally requires 20-50 hours, and the depth of nitriding is only 0.3-0.5mm, no more heat treatment after nitriding.

Coupling surface nitriding has several different purposes:
(1) Improve hardness and wear resistance; (2) Improve fatigue strength; (3) Improve corrosion resistance.

1. Nitriding to improve hardness and wear resistance Steel undergoing such nitriding treatment is made of materials containing aluminum, chromium, molybdenum, manganese and other alloying elements, such as 38CrA1A,38CrMoA1A, etc. After treatment, the surface hardness of Corda HV1000-1110 (equivalent to HRC65-70), its hardness can support to 600-650℃ without reducing. Its disadvantage is that the nitriding time is long and the nitriding layer is thin and the load is small.

2. Nitriding to improve fatigue strength After nitriding, the fatigue limit of steel will be significantly increased (often by 25-35%). This is mainly because of the compression stress formed on the steel surface, so commonly used in the variable load working structural parts, such as internal combustion engine crankshaft and various gears, etc. Ordinary alloy structural steel can be used. Such as 18Cr2Ni4WA and 34CrNi3Mo steel for nitriding of this nature.

3. Nitriding to improve corrosion resistance If only in order to improve corrosion resistance, can be any kind of steel nitriding, low carbon steel often at 620-700℃, nitriding layer depth of 0.025-0.06mm. High carbon steel at 620-800℃, nitriding layer depth is 0.01-0.04mm. In many cases it can replace nickel plating, galvanizing and bluing. General processing parts are instrument parts, lead screw, small shaft and pinion.

To sum up:
In line with the positioning principle of doing middle and high-end coupling, we strive for excellence in the production of coupling, uphold the characteristics of personalized customization in technology and process, diversified design process, subject to customer demand, to ensure customer experience. Welcome customers to consult and buy.
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