17-4 Stainless Steel is a high tensile strength martensitic stainless steel that is used in a wide range of applications due to its excellent oxidation and corrosion resistance. Like all martensitic grades, 17-4 is magnetic. Specifications include but are not limited to ASTM A564, ASTM A693, ASTM A705 and ASTM F899.
Due to the material’s high tensile strength and resistance to oxidation and corrosion, 17-4 is used in a wide range of applications:
- Aerospace structural parts
- Surgical & dental instrumentation
- Industrial parts
- Oil and Gas
- Pump and Boat Shaft
- Food Processing
Medical Application Details
17-4 is one of the most widely used stainless steel grades due to the material’s high tensile strength and resistance to corrosion. However, 17-4 is not an implantable metal. Instead, it is primarily used for various surgical instruments.
17-4 possesses both high strength and good corrosion resistance at temperatures up to 600℉. Additionally, the material has good toughness in both base metal and welds that minimize warpage and scaling.
Without additional heat treating 17-4 is supplied in Condition A. For critical applications, 17-4 can be heat treated to anywhere from H900 to H1150. 17-4 heat treatment improves formability and hardness. The grade achieves peak tensile strength (ksi) in condition H900. H1150 material experiences a slight loss in toughness. However the service life of the material can be restored by a second heat treatment and re-aging.
The grade meets both aerospace and medical requirements including ASTM A564, ASTM A693, ASTM A705 and ASTM F899.
Martensitic Stainless Steel (17-4 PH Classification)
Stainless steels fall into four main categories: martensitic, austenitic, ferritic, and duplex. Martensitic stainless steels are defined by material that can be tempered and hardened by aging or heat treatment.
Martensitic material can be sub-divided into two categories:
1) High carbon material (above 0.4% carbon) used mainly for wear resistance (surgical instruments, molds, etc.)
2) Low carbon material (below 0.4% carbon) used mostly for their mechanical properties (shafts, valves, etc.)
Relative to other martensitic material, 17-4 has a low carbon content (<0.07%).
17-4 Summary Information
|ASTM A564, ASTM A693, ASTM A705, ASTM F899||Medical, Aerospace, Industrial, Oil and Gas, Pump and Boat Shaft, Seals, Valves, Petrochemical, Food Processing||Aerospace Structural Parts Surgical & Dental Instrumentation Industrial Parts||Bar|
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