Surface Hardening Treatment Services for Steel Fabrications
The surface hardening treatment process is very important to our whole products in the industry such as mechanical, electronic, medical devices, aerospace and oil& gap and more. we produce a lot of products that end up performing a variety of tasks. Some applications need a high hardness or strength treatment, especially on their surfaces. Other components encounter stress frequently. Therefore, they require not only a hard and corrosion-resistant surface but also core strength to withstand the impact of the stress.
Two general processes for the critical properties
- Alteration of the chemical composition of the metal surface. We perform this before or after tempering and quenching. The processes we use include carburizing, cyaniding, nitriding and carbonitriding.
- We achieve the hardening of the metal’s surface layer through heating and quenching process. The most conventional techniques we use include induction hardening and flame hardening
Below are an in-depth analysis of Surface Hardening Treatment
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Carburizing process
We perform this process by diffusing carbon into the part’s surface to a specific depth by heating the component in a carbonaceous medium. We refer to the depth of the carburization as the case depth. It is highly dependent on the medium’s carbon potential and the time as well as the temperature of the carburizing treatment. Therefore, we prefer carburizing steels with sufficiently low carbon contents of less than 0.3 percent. The carburizing temperature ranges between 1550 degrees Fahrenheit to 1750 degrees Fahrenheit. Furthermore, we also adjust temperatures to achieve certain case depths. So we determine the steel selection, type of quench and hardenability by first establishing the section size, desired core hardness and service needs.
There are three carburization techniques for surface hardening treatment
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Liquid carburizing
This entails heating molten sodium cyanide or barium cyanide. The steel absorbs some nitrogen and carbon, which improves its hardness.
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Pack carburizing
We perform this by sealing both the solid carbonaceous material and steel within an air-tight container. Heating follows afterwards.
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Gas Carburizing
This process involves heating steel within a gas containing a specific carbon content. This enables us closely to control the carbon level in the steel.
When we utilize any of the methods, we then either quench it after the carburizing cycle without reheating or air-cool it then reheats up to the austenitizing temperature before quenching it.
We vary the case depth to suit the conditions for loading during servicing. It is worth noting that the service characteristics usually require that specific areas undergo hardening. By covering the non-cased areas with copper plating, enables carbon to infiltrate only the exposed areas.
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Nitriding treatment process
We perform this process by heating the steel part within a temperature range of 900 – 1150 degrees Fahrenheit in an atmosphere of ammonia gas and split ammonia for a lengthy period. Nitride formation enables the formation of a thin, tough case. Elements that have strong nitride-forming capabilities need to be present within the steel for this process to be successful. These elements include chromium molybdenum and special nonstandard grades of steel containing aluminum. Furthermore, the major advantage of this process is that we can perform the quenching, tempering, and machining before nitriding. This is because only a little distortion happens during nitriding.
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Cyaniding process
This process entails heating the part in a pool of dissolved sodium cyanide to a temperature slightly beyond the transformation range. So we further proceed by quenching it to obtain a thin case of hardness.
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Carbonitriding surface hardening treatment
It is a similar process to cyaniding, only that we accomplish the absorption of carbon and nitrogen by heating the part in an atmosphere full of hydrocarbon and ammonia for parts that are to undergo quenching, a temperature of 1425-1625 degrees Fahrenheit suits the metal fabrication. When we do not perform quenching, lower temperatures of 1200-1450 degrees are more suitable.
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Flame hardening treatment
This is a process that involves the rapid heating by directly exposing the steel part to a naked high-temperature gas flame. We heat the surface to a temperature above the transformation range the subject it to cooling at a rate that results in its exact hardening. The range of the carbon in the steel we subject to flame hardening lies between 0.30-0.60 %. We spray the quenchant on the surface at a short distance from the heating flame. So, we recommend immediate tempering, most likely through a flame-tempering processor in a conventional furnace.
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Induction Hardening
This process is sort of like the flame hardening process, with the major difference being that a high-frequency electric current encases the steel part undergoing hardening. So, the heating depth is dependent on the frequency, heat conduction rate of the surface and extent of heating surface. We quench the part by spraying it with water at appropriate intervals. Therefore, In some cases, we oil -quench the parts by immersing them in an oil bath after it attains a specific temperature.
Creatingway offers these primary methods of steel surface hardening treatment as a means of properly finishing metal fabrications. As a result, learn more about the properties of the materials by contacting us today.
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