Database of properties for steel and alloy materials worldwide.


Stainless Steel 17-4 PH or ASTM A564 (630)

17-4PH / 1.4542 / S17400
Precipitation Hardening Martensitic Stainless Steel

Stainless Steel 17-4 PH is a precipitation-hardening martensitic stainless steel that is widely used in a variety of applications due to its high strength, corrosion resistance, and excellent toughness. It is also known as ASTM A564 (630), which is the specification for steel.

17-4PH Round Bars AISI 630 ASTM A564 UNS S17400

Corresponding Standards:

The following specifications cover Stainless Steel 17-4

  • AISI 630
  • AMS 5604
  • AMS 5622
  • AMS 5643
  • ASTM A564 (630)
  • ASTM A693 (630)
  • ASTM A705 (630) (Forging - Open Die)
  • MIL C-24111
  • MIL P-47183 (Plate)
  • MIL S-81591
  • UNS S17400

 Property Results
Related Metals:
  • 17-4PH (tm)
  • AL 17-4 (tm)
  • Carpenter Custom 630 (tm)

Chemistry Data :

Carbon 0.07 max
Chromium 15 - 17.5
Copper 3 - 5
Iron Balance
Manganese 1 max
Nickel 3 - 5
Niobium 0.15 - 0.45
Niobium+Tantalum 0.15 - 0.45
Phosphorus 0.04 max
Silicon 1 max
Sulphur 0.03 max

Principal Design Features

One of the most widely used precipitation hardening grades in the business. While soft and ductile in the solution annealed condition, it is capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high harness, toughness and strength.


Commonly used in both aircraft and gas turbines, nuclear reactors, paper mills, oil fields, and chemical process components.


Long, gummy chips characterize this alloy's machinability. It can be machined in the annealed condition, however, condition H1150M will yield the best results. Post-machining solution treatment of parts will be required prior to final hardening if machining in this condition.


This alloy is capable of being only mildly formed. If forming is required, do so in the overaged condition for best results.


Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding. AWS E/ER630 filler metal is recommended if required.

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 a 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.


Soak for 1 hour at 2150 F (1177 C) prior to forging. Do not work below 1850 F (1010 C). Post-work solution treatment is required prior to final hardening.

Hot Working

17-4 PH can be easily hot-worked using most of the common processes. It is suggested that the material be solution treated at 1900 F(1038 C) and then formed during cooling while the material is still austenitic. Post-work solution treatment is required prior to final hardening.

Cold Working

Despite its high initial yield strength, 17-4 can be cold worked successfully by most common methods.


1900 F (1038 C), hold for 1/2 hour, rapid cool.


This alloy 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.

Physical Data:

Density (lb / cu. in.)


Specific Gravity


Specific Heat (Btu/lb/Deg F - [32-212 Deg F])


Electrical Resistivity (microhm-cm (at 68 Deg F))


Overall, Stainless Steel 17-4 PH is a highly versatile material that is suitable for a wide range of applications due to its high strength, corrosion resistance, and excellent toughness.

Some of the applications where Stainless Steel 17-4 PH is used include:

  1. Aerospace: Stainless Steel 17-4 PH is used in the aerospace industry for structural components, landing gear, and engine parts.
  2. Chemical Processing: Stainless Steel 17-4 PH is used in chemical processing plants for pumps, valves, and fittings.
  3. Medical Devices: Stainless Steel 17-4 PH is used in medical devices, such as surgical instruments and orthopedic implants.
  4. Defense: Stainless Steel 17-4 PH is used in defense applications for firearms, missiles, and other weapon systems.

Comments :

Ashish Shah said... on 

Thanks for sharing.
304 Stainless Steel Round Bar

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