| Grade Type | ASTM/UNS Designation | EN Designation | GB/T Designation | JIS Designation | Key Properties | Typical Fastener Applications |
|---|---|---|---|---|---|---|
| Austenitic | 304 / S30400 | X5CrNi18-10 | 06Cr19Ni10 | SUS304 | Excellent corrosion resistance; good formability; non-magnetic; suitable for mild corrosive environments | Drywall screws, machine screws, nuts for construction, kitchen hardware |
| Austenitic | 304L / S30403 | X2CrNi18-9 | 022Cr19Ni10 | SUS304L | Low-carbon version of 304; better intergranular corrosion resistance; ideal for welding applications | Welded bolt assemblies, marine auxiliary fasteners |
| Austenitic | 316 / S31600 | X5CrNiMo17-12-2 | 06Cr17Ni12Mo2 | SUS316 | Superior corrosion resistance (especially to chloride); good heat resistance | Marine fasteners, chemical equipment bolts, coastal construction screws |
| Austenitic | 316L / S31603 | X2CrNiMo17-12-2 | 022Cr17Ni12Mo2 | SUS316L | Low-carbon 316; enhanced weldability and intergranular corrosion resistance | High-corrosion environment fasteners, pharmaceutical machinery parts |
| Martensitic | 410 / S41000 | X10Cr13 | 12Cr13 | SUS410 | High strength and hardness (after heat treatment); moderate corrosion resistance; magnetic | High-strength bolts, valve fasteners, mechanical equipment screws |
| Martensitic | 420 / S42000 | X20Cr13 | 20Cr13 | SUS420J1 | Higher carbon content than 410; better hardness and wear resistance | Cutting tool fasteners, high-pressure equipment bolts |
| Ferritic | 430 / S43000 | X6Cr17 | 06Cr17 | SUS430 | Good oxidation resistance; low cost; magnetic; limited formability | Decorative fasteners, oven hardware, non-critical structural screws |
| Duplex | 2205 / S32205 | X2CrNiMoN22-5-3 | 022Cr22Ni5Mo3N | SUS2205 | High strength + excellent corrosion resistance; twice the strength of 316 | Offshore oil platform fasteners, desalination equipment bolts |
| Grade Type | ASTM/UNS Designation | EN Designation | GB/T Designation | JIS Designation | Key Properties | Typical Fastener Applications |
|---|---|---|---|---|---|---|
| Austenitic | 304 / S30400 | X5CrNi18-10 | 06Cr19Ni10 | SUS304 | Excellent corrosion resistance; good formability; non-magnetic; suitable for mild corrosive environments | Drywall screws, machine screws, nuts for construction, kitchen hardware |
| Austenitic | 304L / S30403 | X2CrNi18-9 | 022Cr19Ni10 | SUS304L | Low-carbon version of 304; better intergranular corrosion resistance; ideal for welding applications | Welded bolt assemblies, marine auxiliary fasteners |
| Austenitic | 316 / S31600 | X5CrNiMo17-12-2 | 06Cr17Ni12Mo2 | SUS316 | Superior corrosion resistance (especially to chloride); good heat resistance | Marine fasteners, chemical equipment bolts, coastal construction screws |
| Austenitic | 316L / S31603 | X2CrNiMo17-12-2 | 022Cr17Ni12Mo2 | SUS316L | Low-carbon 316; enhanced weldability and intergranular corrosion resistance | High-corrosion environment fasteners, pharmaceutical machinery parts |
| Martensitic | 410 / S41000 | X10Cr13 | 12Cr13 | SUS410 | High strength and hardness (after heat treatment); moderate corrosion resistance; magnetic | High-strength bolts, valve fasteners, mechanical equipment screws |
| Martensitic | 420 / S42000 | X20Cr13 | 20Cr13 | SUS420J1 | Higher carbon content than 410; better hardness and wear resistance | Cutting tool fasteners, high-pressure equipment bolts |
| Ferritic | 430 / S43000 | X6Cr17 | 06Cr17 | SUS430 | Good oxidation resistance; low cost; magnetic; limited formability | Decorative fasteners, oven hardware, non-critical structural screws |
| Duplex | 2205 / S32205 | X2CrNiMoN22-5-3 | 022Cr22Ni5Mo3N | SUS2205 | High strength + excellent corrosion resistance; twice the strength of 316 | Offshore oil platform fasteners, desalination equipment bolts |
