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The characteristics of NSK import bearing steel has, on the smelting quality requirements than the general industrial use of steel is much more stringent, such as chemical composition, the purity of steel, organization and structure uniformity.
First, the strict requirements of the chemical composition
General NSK import bearing steel is mainly of high carbon chromium bearing steel, carbon content of about 1%, adding about 1.5% chromium, hypereutectoid steels containing manganese, silicon and small amounts of. Content of only strict control of chemical composition of NSK imported bearings in steel, can be satisfied and the hardness of NSK imported bearings performance organizations through heat treatment process.
Second, the strict requirements of high precision size
Rolling bearing steel precision is high, this is because most NSK import bearings parts must pass through the pressure molding. In order to save raw materials and improve labor productivity, most of the NSK import bearing ring to forging molding, cold heading steel ball is passed or hot rolling, roller small size is after cold forging. If the dimensional accuracy of steel is not high, is unable to accurately calculate the sizes of materials and weight, so it can not guarantee the NSK import bearing parts of the product quality, but also easy to damage caused by manufacturing equipment.
Purity of third, particularly strict requirements
The purity of steel refers to the number of the impurities in the steel, the higher the purity, non metallic inclusions in steel is less. Oxides, silicates and other harmful impurities in bearing steel and the content of NSK bearing imports early fatigue spalling, NSK imports bearing life reduces a great relationship. Especially the greatest harm brittle impurity, as easily from the metal substrate peeling off in the process, seriously affect the NSK bearing imports refined appearance quality.
The macrostructure and microstructure of fourth (Gao Bei), the strict requirements of organization
The macrostructure of bearing steel is generally loose, central porosity and flat analysis, microscopic (Gao Bei) tissues including the annealing microstructure, steel net carbide, strip and liquid separation etc.. Carbide eliquation of hard and brittle, harmfulness and brittle inclusions are the same. The carbide network and reduce the impact toughness of the steel, and the tissue is not uniform, easy to deformation and cracking during quenching. The banded carbide effect of annealing and quenching and tempering organization and contact fatigue strength.