Roller bearings in the use of the process, the ring and rolling elements must withstand high contact stress and impact load, rolling mill bearings normally manufactured from high-quality high-carbon chromium bearing steel or high-quality carburizing bearing steel .

High-carbon chromium bearing steel: GCr15, GCr15SiMn, GCr18Mo;
Carburized bearing steel: G20Cr2Ni4A, G10CrNi3Mo;
Raw materials inspection standards:
high - carbon chromium bearing steel, GB / T 18254-2002,
carburizing bearing steel technical conditions, GB 3203-82.


CHG® rolling mill bearing quality control strictly enforced (JB / T5389.1 "rolling bearing - rolling mill using four cylindrical roller bearings", JB / T5389.2 "rolling bearing - rolling mill using double row and four row of tapered roller bearings")
① improve the grinding process to prevent and eliminate grinding burns and cracks. Use the test machine to check the parts crack to prevent and reduce the bearing parts fracture failure.
② bearing surface processed by ultra-fine grinding machine to improve the accuracy of surface roughness, so that the surface in the compressive stress state, in order to improve the bearing contact fatigue life.
③ strengthen the site management, to avoid scratches on the face, reduce the stress source of fatigue damage.
④ roller with full convex (or semi-convex) roller, in order to avoid or reduce the edge load, improve bearing life.
⑤ precise control of each ring and roller, to ensure that the bearing diameter and bearing clearance consistent to ensure that the four rows of rollers in the same force.
⑥ bearing parts and bearing cleanliness in line with industry standards.