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What is the difference between 52 100 bearing steel and GCr 15 bearing steel? ?
52 100 is an American name, but it is actually GCr 15 bearing steel, Japan SUJ2, Germany 100Cr6( 1.3505). The material is the same.

Chemical composition: c: 0.95-1.10si: 0.15-0.35mn: < 0.50p <; 0.025s < 0.025 Cr: 0.30- 1.60.