17-4 PH 630 1.4542 Heat Treatment

Condition A--Soak at 1900°F (1038°C) for 30 minutes and cool below 60°F (16°C) for complete martensite transformation. Condition H 950- Treat Condition A material at 900°F(482°C) for 1 hour, air cool. Condition H925, H1025, H1075, H1100, H1150- Soak solution treated material for 4 hours at specified temperature, air cool, Condition H1150M- Soak solution treated material at 1400°F (760°C) for 2 hours, air cool, then re-heat to 1150°F (620°C) for 4 hours and air cool.

17 4PH has good ductility and may be readily formed by all conventional methods. Because the alloy is stronger than regular steel it requires more powerful equipment to accomplish forming. Heavy-duty lubricants should be used during cold forming.

To increase the resistance to surface wear, with a slight decrease in corrosion resistance, 17-4PH stainless steel can be nitrided. An approximate hardness of 64/67HRc can be achieved, with a surface hardness depth of up to 0.15mm when nitrided at 540°C, while still maintaining a high core strength.

Martensitic transformation
Indicative values
Ms : 266°F (130°C)
Mf : 86°F (30°C)

Aging / Tempering
The highest mechanical properties are obtained with the following heat treatment : 896°F (480°C) – 1 hour – air cooling. Higher ductilities are obtained when using higher aging temperature up to 1148°F (620°C).

Solution annealing
1925°F+ /-50°F (1050°C +/-25°C) – 30 min up to 1 hour. 
air cooling / oil quenching below 76°F (25°C)

Hardness/Temperature tempered for 4 hours after austenitizing at 1904°F (1040°C) for 30 min quenched 212°F/sec (100°C/sec).

Solution Treatments

As supplied 17-4PH, is usually in the solution treated condition, (Condition A). It can be heat treated at different temperatures to off a wide range of properties. (We also hold stock in HH1150).