1,Grade: 20CrMnTi 

   C:0.1% ,Si:0.28%,Mn:0.93%,Ti:0.05,Cr:1.13%,S:0.012%,P:0.015%

2,There are 2 and 3 parts type

3,OEM base on your drawing or sample accepted

4,Surface hardness: HRA79-84

5,Core hardness:HR38-46

6,Carbonitriding Layer Depth: 0.35-0.6mm or 0.6-0.8mm

7,Carbonitride:1-3 

8,Tempered:1-4

9,Retained Austenite:1-4

10,Standard:GB/T14370-20007 ,GB/T2301-2004