17-4

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.

Common Applications

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
  • Seals
  • Valves
  • Petrochemical
  • 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.

Material Characteristics 

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

Specs Markets Applications Forms
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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