OHNS Round Bar

As a versatile and widely used tool steel, OHNS (Oil Hardening Non-Shrinking) round bars offer exceptional properties for various applications and are commonly used in multiple industries. As a result of their superior hardness, toughness, and wear resistance, OHNS round bars are popular in a wide range of industries, including manufacturing, tooling, engineering, and automotive. I am writing this detailed description to provide a better understanding of the critical characteristics, manufacturing process, and applications of OHNS round bars.

As a result of their remarkable hardness, OHNS round bars are ideal for applications that require strength and durability due to their unusual hardness. The hardness of the steel varies between 58 and 64 HRC (Rockwell hardness scale), ensuring that it is highly resistant to wear, abrasion, and deformation. Under extreme working conditions, OHNS round bars retain their shape and structural integrity, making them highly suitable for heavy-duty strength and durability applications.

As a distinctive characteristic of OHNS round bars, they do not shrink when exposed to heat. A significant benefit of the hardening process of this steel is that it results in minimal dimensional changes, ensuring consistent and precise dimensions. Because of this property, OHNS round bars are a reliable choice for applications requiring tight tolerances and accurate measurements due to their precision construction.

The OHNS round bars are produced in several steps to achieve their superior properties. Iron, carbon, manganese, chromium, molybdenum, and vanadium are the primary materials used in the manufacturing process of this product. By adding these alloying elements to steel, it is possible to enhance its hardness, toughness, and machinability.

To manufacture OHNS round bars, the first step is to melt the raw materials in an electric arc furnace or a similar high-temperature furnace, after which they are formed into the desired shape. It is then refined and cast into ingots or continuous casting molds once the molten steel has been obtained. The nuggets are shaped into round bars through a series of rolling mills after hot rolled into ingots.

It is after the OHNS round bar has been hot rolled that it undergoes oil hardening. After the bar is heated to a specific temperature range, it is quenched in oil for a long time. As a result of the rapid cooling of steel in oil, the microstructure of the steel is transformed, giving it hardness and toughness. It is then necessary for the round bar to be further machined and finished.

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