17-4 H900 Stainless Steel is a martensitic stainless steel that is used in a wide range of applications due to its strong combination of high strength and excellent resistance to corrosion. Eight different heat treatments have been developed starting with H900 up to H1150-M. Specifications include but are not limited to AISI 630, AMS 2303, AMS 5643, ASTM, A370, ASTM A564 and ASTM F899.
Due to the material’s high strength and corrosion resistance 17-4 H900 is used in a wide range of applications:
Oil & gas foils, helicopter deck platforms
- Chemical processing equipment
- Biomedical hand tools
- Aerospace structural parts
- Valve trim
- Various marine applications
- Pump shafts, gears, plungers
- Food production equipment
Medical Application Details
Due to the material’s high strength and strong corrosion resistance with an ASTM F899 specification, the grade is used in a wide range of surgical instruments. However, in contrast to other grades, 17-4 H900 is not an implantable metal. Instead, it is primarily used for various surgical instruments including but not limited to surgical scissors, ear pins, rollers and guides.
17-4 H900 has excellent mechanical properties and is inexpensive relative to comparable high-nickel, non-ferrous alloys. It’s corrosion resistance is generally comparable to 304 and is better than the 400 series. Note that long-term exposure to elevated temperature can result in lower toughness. Severe cold working should be done primarily at the H1150 condition to avoid cracking.
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 H900 Summary Information
|630, AMS 2303, AMS 5643, ASTM, A370, ASTM A564 and ASTM F899.||Medical, Aerospace, Industrial||Surgical Scissors, Oil & gas foils, Helicopter Deck Platforms, Aerospace Structural Parts, Valve Trim, Various Marine Applications||Bar|
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