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Heavy Duty Slewing Bearing Custom | Seamless Hardening Case Depth ≥8mm · P4 Accuracy · 30% Noise Reduction Proven | Henan Sankuang Machinery
Henan Sankuang Machinery Technology Co., Ltd., located in Luoyang Heavy Equipment Manufacturing Base, specializes in R&D and precision machining of slewing bearings with diameters from 500mm to 3,000mm and accuracy grades P0-P4. MOQ 1 set.
Actual Delivery Case: In 2025, we manufactured a 2,800mm diameter slewing bearing for a mining equipment client. The client's previous supplier's product developed abnormal noise and early raceway wear after approximately 8 months. Analysis revealed the root cause was insufficient local hardness from quenching soft zones. We adopted seamless hardening process (4 inductors, 800KW total power), completely eliminating soft zone defects. Client reported approximately 30% noise reduction, with calculated bearing life extended to 1.8 times the original. The client subsequently placed additional orders for 12 units.
Manufacturing Process: Slewing bearing manufacturing follows forging → annealing → rough machining → heat treatment → finishing → assembly. Ring forging eliminates internal defects and optimizes metal flow lines. Heat treatment is critical: quenching at 820-840℃ for 1-2h with oil cooling; tempering at 150-180℃ for 2-5h with air cooling. Grinding ensures final dimensional accuracy.
Process Highlights: Induction hardening hardness ≥55HRC, case depth ≥4mm, seamless hardening process available.
Materials: 42CrMo, 50Mn, GCr15SiMn.
Delivery Documents: Material certificates, hardness test reports (with case depth curves), dimensional inspection reports, UT/MT inspection reports.
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