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| STANDARD | WERKSTOFF NR. | UNS | BS | AFNOR | SIS | AISI |
| SS 420 | 1.4021 | S42010 | 420S29 / 420S37 | – | 2303 | 420 |
| SS 420J1 | 1.4021 | S42010 | 420S29 | Z20C13 | 2303 | 420L |
| SS 420J2 | 1.4028 | S42000 | 420S37 | Z20C13 | 2304 | 420M |
420 stainless-steel is a martensitic higher carbon version of sorts 410 and 416 unstained that may be hardened by heat treatment. It contains a minimum of 12% Cr, spare to allow 420 corrosion resistance properties.

Type 420 stainless-steel provides outstanding corrosion resistance and exceptional wear resistance. 420 stainless-steel coils are used in dental and surgical instruments, cutlery, plastic molds, pump shafts, steel balls, and numerous hand tools. Because of its air hardening properties, 420 stainless-steel coils aren't usually welded.
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