1.Material : 20 CrMnMo or 16MnCr5 

2. Roughness EN ISO 1302:Ra6.3

3. Hardness before nitriding: 680 - 750 HV 0,5

4. Hardness after nitriding: min. 550 HV 0,5

5. (D) Nitride hardening depth: min. 15µm on final part

6 Tensile strenght

after quenching: Rm = 900 - 1350 N/mm²

after spheroidation: Rm max. = 500 N/mm²

7. Surface treatment: nitride hardening