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  https://1dd0cebe46f273c7.en.made-in-china.com/product/PXunsyEKEjrM/China-1015-Carbon-Steel-Balls-for-Automotive-Valve.html Product Details Chrome steel ball , as the main part of bearing, are being widely used on the application like automotive industry, motors, home appliances, instruments, hardwares etcs. Shandong Dihui mainly produce the chrome steel with sizes 0.3-120mm, with the main material chrome GCR15 or GCR15SiMn. The balls have high precision, good surface smoothness,  standard hardness and excellent wear-resisting performance. Our products are being widely exported to Europe, USA, Japan, South Korea, Middle Asia and Southeast Asia. Material Chemical composition(%) C Si Mn Cr Mo P S Ni Cu GCr15 steel ball 0.95 to 1.05 0.15 to 0.35 0.25 to 0.45 1.40 to 1.65 ≤ 0.1 ≤ 0.025 ≤ 0.02 ≤ 0.25 ≤ 0.25 GCr15SiMn steel ball 0.95 to 1.05 0.45 to 0.75 0.95 to 1.25 1.40 to 1.65 ≤ 0.1 ≤ 0.025 ≤ 0.02 ≤ 0.25 ≤ 0.25 Country China USA Germany Russia Japan Material Standard GB/T18254-2016  ASTM

  http://www.dihuibearing.com/good/37.html Description Shandong Dihui mainly produce cylindrical roller with the main material chrome GCR15. They have high precision, good surface smoothness,  standard hardness and excellent wear-resisting performance. Our products are being widely exported to Europe, USA, Japan, South Korea, Middle Asia and Southeast Asia. Parameter Material Chemical composition(%) C Si Mn Cr Mo P S Ni Cu GCr15 0.95 to 1.05 0.15 to 0.35 0.25 to 0.45 1.40 to 1.65 ≤ 0.1 ≤ 0.025 ≤ 0.02 ≤ 0.25 ≤ 0.25 Country China USA Germany Russia Japan   Material Standard GB/T18254-2016  ASTM A295/A295M - 2014 ISO683-17-2014 GOST 801-1978 JIS G4805-2019   Material GCr15 52100 100Cr6 (1.3505) Ш X15 SUJ2   Production Capacity *Type: NRA/NRB *Range ： --Dia: 1mm-6mm. --Length: 5.8mm-39.8mm. *Grade ： DIN 5402-2: G2/G5 ,   GB/T 309:G2/G3/G5. * Profilling: "ZB" Needle roller ,  Straight needle roller