Product Description
Our advantages: Steelmaking technology is the core of bearing steel purity and bearing quality. At present, the continuous casting technology of high-speed steel and tool steel is basically blank in domestic industrial production, and the continuous casting of these high-quality special steels is easy to produce leakage, products are easy to break and crack, and the success rate is low. Although a few domestic enterprises have tried horizontal continuous casting and arc round billet continuous casting for trial production of die steel, the results are not satisfactory. The Jumbo Bloom vertical caster used by Timken perfectly solved all kinds of problems in the continuous casting process of this kind of high-quality steel. And the whole process of casting and casting billet solidification is a continuous cast steel type which is carried out in a vertical state. A series of equipment and operations such as tundish, crystallizer, secondary cooling zone, tension leveler, cutting equipment, and acceptance of fixed-length casting billet are all arranged on a vertical center line. Luoyang east shaft is made of high-purity bearing steel, which makes the bearing quality more reliable.
With the improvement of the physical quality of bearing steel and the quality demand of bearing industry in China, the standards are constantly revised and upgraded. At present, the main standards for bearing steel are: GB/T18254-2016 High Carbon Chromium Bearing Steel, GB/T3203-2016 Carburized Bearing Steel, GB/T33161-2016 Carburized Steel for Automobile Bearings, and GB/T32959-2016 Large Carbon Chromium Bearing Steel. T3086-2019 High Carbon Chromium Stainless Bearing Steel, YB/T4572-2016 Rolling Ring and Blank of Bearing Steel, GB/T28417-2012 Carbon Bearing Steel, GB/T29913-2013 Bearing Steel for Wind Power Equipment, GB/T. The application fields include general bearings and special fields such as wind power, automobile, rail transit and aerospace. Among them, GB/T18254-2016 "High Carbon Chromium Bearing Steel" is the most widely used bearing steel, and it is also recognized by the industry as one of the international advanced standards.
The anisotropy of thermal expansion in solid metal of bearing steel can be qualitatively explained by the strength of bonding force between atoms. In the non-cubic crystal system, the bonding force between atoms parallel to the axial direction and perpendicular to the axial direction is quite different. If the bonding force in one direction is smaller than that in other directions, the crystal is first thermally excited in this direction, which makes the thermal expansion in this direction increase rapidly, and then shrinks when perpendicular to this direction, resulting in the phenomenon that the linear expansion coefficient is negative.
Due to the influence of external temperature, the accuracy of bearings will also change. How to overcome this problem, we adopt this set of calculation methods: Relationship between volume expansion coefficient and linear expansion coefficient. aV = 3al[1+al(T2-T1)] For cubic, hexagonal, trigonal and orthorhombic crystal systems, thermal expansion will not cause crystal form change: aV = al1+ al2+ al3;; For monoclinic system: aV = al1+ al2+ al3+ al5;; For triclinic system: aV= al1+ al2+ al3+ al4+ al5+ al6. (av-sum of linear expansion coefficients in three mutually perpendicular crystal axis directions,ºC-1; Al1, al2, al3- are the main expansion coefficients in three crystal axis directions respectively,ºC-1; Al4+ al5+ al6- shear strain expansion coefficient, ºC-1. )
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