for 1020 the equivalent is
Material Number:
1.0402
Symbol:
C 22
Standards:
DIN EN 10083 Teil 2: (10/91)
Quenched and tempered steels. Unalloyed quality steels
Remplaces :
DIN 17200 (03/88) (03/87)
International conformity :
; EN 10083-2 (96)
DIN 1652 Teil 4: (11/90)
Bright steel. Steels for...
For 17-4PH
0,2% Yield stress
at 100°C
>= 880 N/mm²
at 150°C
>= 830 N/mm²
at 200°C
>= 800 N/mm²
at 250°C
>= 770 N/mm²
at 300°C
>= 750 N/mm²
This is from Stahlschlussel. Please provide more information about the other steels.
Hi,
HARDENING: Heat slowly. Preheat at 790 C, austenitize at 950C and hold at temperature for 20 min for small tools to 45 min for large tools. Air cool on all sides. Typical quenched hardness, 62 to 65 HRC.
TEMPERING: Temper imediately at 180C for 3 hours. After tempering you must obtain aprox...
After oil quench from 830 C degree you must obtain min 66 HRC.
If you want a good microstructure of the case put the parts at -60 to -80 C degree for 2 hours immediately after the quench. This is not obligatory.
Temper the parts at 220 C degree and you should obtain aprox 61 HRC.
I made a depth case about 1.6 mm with 16MnCr5 steel in vacuum furnace at 885 C degree / 180 min carburising and 150 min diffusion at 900 C degree.
For 0.9-1.0 mm you can use 885 C degree - 125 min carburising and 110 min diffusion at 900 C degree (vacuum furnace with propane).
For another type...
