Custom 455® (Carpenter Technology product) is a martensitic stainless steel that is used in many applications because of its excellent yield strength (3x standard 304’s yield strength) and good ductility. Additionally, the material is used because it is easy to fabricate and has good resistance to corrosion. Specifications include but are not limited to AMS 5617, ASTM A564, 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:
- Surgical instruments
- Drill bits
Medical Application Details
Custom 455® is one of the most widely used stainless steel grades for surgical instruments because of its high tensile strength and resistance to corrosion in fresh water. However, in contrast to other grades, Custom 455® 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.
Custom 455® posses excellent yield strength after a single-step aging treatment and is relatively formable in the annealed condition. Also, due to its low work-hardening rate, the grade can be extensively cold formed.
The grade also has excellent resistance to oxidation although sustained exposure to high temperatures can reduces the material’s toughness. The use of higher aging temperatures can offset this dynamic.
Custom 455® can be both hot worked and cold worked. Additionally, the grade can be welded using shielded fusion or the resistance welding process.
The grade meets both aerospace and medical requirements including AMS 5617, ASTM A564, and ASTM F899.
Martensitic Stainless Steel (Custom 455® 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, Custom 455® has a low carbon content (0.05%).
Custom 455® Summary Information
|AMS 5617, ASTM A564, ASTM, ASTM F899||Medical, Aerospace, Industrial||Surgical instruments, Drill bits, Drivers, Shafts||Bar|
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