ISO 9445
The ISO 9445 standard does not explicitly list stainless steel grades, as it focuses on dimensional tolerances for cold-rolled stainless steel products.
The grades below are commonly used in cold-rolled strip, sheet, and plate applications, drawn from ISO 15510:2014 and EN 10088 standards, which are referenced for stainless steel compositions and properties.
| ISO Designation | EN Designation | UNS Number | Stainless Steel Family | Applications |
| X5CrNi18-10 | 1.4301 | S30400 | Austenitic | Equivalent to 304, used in food processing, architecture. High corrosion resistance, non-magnetic. |
| X2CrNi19-11 | 1.4306 | S30403 | Austenitic | Low-carbon 304L, improved weldability, used in chemical and food industries. |
| X8CrNiS18-9 | 1.4305 | S30300 | Austenitic | Free-machining 303, used for machined parts, good corrosion resistance. |
| X12CrMnNiN17-7-5 | 1.4372 | S20100 | Austenitic | Equivalent to 201, cost-effective, used in cookware, appliances. |
| X10CrNi18-8 | 1.4310 | S30100 | Austenitic | Equivalent to 301, high strength, used in automotive trim, springs. |
| X6CrNiMoTi17-12-2 | 1.4571 | S31635 | Austenitic | Titanium-stabilized 316Ti, used in high-temperature corrosive environments. |
| X5CrNiMo17-12-2 | 1.4401 | S31600 | Austenitic | Equivalent to 316, molybdenum-enhanced, used in marine and chemical environments. |
| X2CrNiMo17-12-2 | 1.4404 | S31603 | Austenitic | Low-carbon 316L, used in welded structures, high corrosion resistance. |
| X2CrNiMo18-14-3 | 1.4435 | S31703 | Austenitic | Low-carbon 317L, higher molybdenum, used in chemical processing. |
| X6CrNiTi18-10 | 1.4541 | S32100 | Austenitic | Equivalent to 321, titanium-stabilized, used in high-temperature applications (800-1500°F). |
| X6CrNiNb18-10 | 1.4550 | S34700 | Austenitic | Equivalent to 347, niobium-stabilized, used in jet engines, high-temperature applications. |
| X12Cr13 | 1.4006 | S41000 | Martensitic | Equivalent to 410, used in cutlery, valves, moderate corrosion resistance. |
| X20Cr13 | 1.4021 | S42000 | Martensitic | Equivalent to 420, used in cutting tools, surgical instruments, high hardness. |
| X30Cr13 | 1.4028 | S42030 | Martensitic | High-strength cutting tools, razor blades, moderate corrosion resistance. |
| X39CrMo17-1 | 1.4122 | – | Martensitic | High hardness, used in wear-resistant applications, moderate corrosion resistance. |
| X17CrNi16-2 | 1.4057 | S43100 | Martensitic | Higher toughness, used in engineering applications, moderate corrosion resistance. |
| X15Cr13 | 1.4024 | S42010 | Martensitic | Used in knives, bearings, moderate corrosion resistance. |
| X6Cr17 | 1.4016 | S43000 | Ferritic | Equivalent to 430, used in automotive trim, appliances, good formability, magnetic. |
| X2CrTi12 | 1.4512 | S40900 | Ferritic | Equivalent to 409, cost-effective, used in automotive exhaust systems. |
| X2CrNbTi18 | 1.4509 | S43940 | Ferritic | High chromium, used in exhaust systems, ferromagnetic. |
| X2CrNiMoN22-5-3 | 1.4462 | S31803/S32205 | Duplex | Equivalent to 2205, used in oil and gas, chemical industries, high strength. |
| X2CrNiMoN25-7-4 | 1.4410 | S32750 | Super Duplex | High strength, used in offshore, marine applications, superior corrosion resistance. |
| X2CrNiMoCuWN25-7-4 | 1.4501 | S32760 | Super Duplex | High corrosion resistance, used in seawater, chemical processing. |
| X1NiCrMoCu25-20-5 | 1.4539 | N08904 | Austenitic | Equivalent to 904L, high-alloy, used in sulfuric acid processing. |
| X1CrNiMoCuN20-18-7 | 1.4547 | S31254 | High Molybdenum | High corrosion resistance, used in seawater, chemical processing. |
| X5CrNiCuNb16-4 | 1.4542 | S17400 | Precipitation Hardening | Equivalent to 17-4 PH, high strength, used in aerospace, nuclear applications. |
| X7CrNiAl17-7 | 1.4568 | S17700 | Precipitation Hardening | Equivalent to 17-7 PH, high strength, used in aerospace, chemical equipment. |
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