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. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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 1850 ° F (1010 ° C) + 500 260 43 420C 1900 ° F (1038 ° C) + 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 24 700 371 54/55 410X 1875 ° F (1024 ° C) + 500 260 46 800 D 427 55 Oil quench 700 371 46/47 420F 1900 ° F (1038 ° C) + 300 149 52 or air cool 900 C 482 48 Warm oil quench 400 204 52 1000 C 538 44 500 260 50 1100 593 31 600 315 50 416 Mod 1800 ° F (982 ° C) + 300 149 38 700 371 49 Oil quench 500 260 37 800 D 427 49 700 371 37 420F Mod 1900 ° F (1038 ° C) + 300 149 53 900 C 482 35 Warm oil quench 400 204 50 1000 C 538 30 500 260 48 1100 593 22 600 315 48 416 1800 ° F (982 ° C) + 300 149 41 700 371 48 Oil quench 500 260 39 800 D 427 48 700 371 41 UNS S42026 1920 ° F (1050 ° C)+ 400 204 56 900 C 482 36 oil quench or 500 260 54/55 1000 C 538 31 pressure gas 600 315 53/54 1100 593 26 431 ...