304 Stainless Steel----This is the most popular insert material, and it will satisfy most application requirements for strength, corrosion resistance and temperature capability.
The inserts of 304 Stainless Steel can be used in applications with a temperature range from -320° F to 800° F. Cold rolling the stainless steel wire to a diamond shape work-hardens it to a tensile strength above 200,000 PSI, a hardness of Rc 43-50 and a smooth 8-16 micro-inch finish.
The inserts become slightly magnetic from the work-hardening that occurs during the manufacturing process (approx. 2-10 G/O).
The insert material is covered by specifications AS7245, NASM8846 and alloy number UNS S30400.