1.1 This specification covers the chemistry requirements for wrought stainless steels used for the manufacture of surgical instruments. The data contained in Tables 1- 4 of this specification, including typical hardness values, common heat treating cycles, and examples of selected stainless steels that have been used for surgical instruments, is provided for reference only. Mechanical property requirements, heat treating requirements, hardness requirements and all other requirements except chemistry are governed by the appropriate material standards as referenced below or as agreed upon between the purchaser and supplier. TABLE 1 Typical Maximum Hardness for Selected Class 4 Martensitic Stainless Steels in The Annealed Condition A Type Typical Maximum Brinell Hardness B 410 210 410X 220 416 262 416 Mod 262 420A 220 420B 235 420 Mod 255 420X 262 420C 262 420F 262 420F Mod 262 UNS S42027 255 431 285 440A 285 440B 285 440C 285 440F 285 UNS S42026 260 UNS S42010 235 A Excludes billets and bars for forging. B Or equivalent Rockwell hardness. TABLE 2 Typical Heat Treating Cycles and Resultant Hardness Values for Selected Class 4 Martensitic Stainless Steels Type Typical Hardening A Heat Treatment Typical Hardness at Indicated Tempering Temperature B Type Typical Hardening A Heat Treatment Typical Hardness at Indicated Tempering Temperature B F C (HRC) F C (HRC) 410 1850F (1010C)+ 500 260 43 420C 1900F (1038C)+ 300 149 58 Oil quench 700 371 43 Warm oil quench 400 204 55/56 or air cool 900 C 482 42 500 260 53/54 1000 C 538 30 600 315 53/54 1100 593 24 ...