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For nothing. Sorry about other materials, but I try to find something soon.

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...

17-4 aged at 550 Celsius.

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.

No, Y15Pb is equivalent with 1.0753 DIN, but depends of your needs it is possible to use 12L14.

maybe this will be a start point:http://www.matls.com/search/searchproperty.asp

No Goahead, my answer is for vacuum furnace too. 8,5 bars is not a very low pressure.

Quench the parts from 870C in oil. Temper at 160C for 2h.

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...

Temper the parts at 100 C for 63 HRC and at 200 for 62 HRC

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...

Yes, but maybe we think too far. Zonian1903 can elucidate this issue.

but 4140 is not suitable for carburising and 380 Brinell is too low for an surface treatment.

Just quench at 1580F in oil and temper at 860F. The entire part will be at 380 Brinell.

bagnamento, Titanium decrease hardenability of steels with medium content of chromium, but not too much. The heat treatment is the same for both of steels. It is possible to obtain after heat treatment some carbide network.

Ni is not important now. My suggestion is A401 SAE, or W1.7102.

I'm a metalurgical engineer and if you need help just ask.