Standard: ASTM A276 / A582 / A564 · EN 10088-3 · JIS G4303 / G4318
Most bright stainless bar is one of a dozen grades. The choice is a trade between corrosion resistance, strength and how easily the bar machines: 303 and 416 machine fastest because of their added sulphur, but give up some corrosion resistance and weldability; 316L and duplex resist chlorides best; 420, 431 and 17-4PH can be hardened for shafts and wear parts.
| AISI / ASTM type | UNS | EN number | EN name | JIS | Typical bright-bar use |
|---|---|---|---|---|---|
| 303 | S30300 | 1.4305 | X8CrNiS18-9 | SUS303 | Free-machining austenitic: fittings, bushes, nuts and turned parts made on automatic lathes |
| 304 / 304L | S30400 / S30403 | 1.4301 / 1.4307 | X5CrNi18-10 / X2CrNi18-9 | SUS304 / SUS304L | General purpose: food and process equipment, fasteners, shafts in mild service |
| 316 / 316L | S31600 / S31603 | 1.4401 / 1.4404 | X5CrNiMo17-12-2 / X2CrNiMo17-12-2 | SUS316 / SUS316L | Marine and chemical service, pump and valve parts, boat shafting |
| 316Ti | S31635 | 1.4571 | X6CrNiMoTi17-12-2 | SUS316Ti | Higher-temperature and welded parts (common in German specifications) |
| 416 | S41600 | 1.4005 | X12CrS13 | SUS416 | Free-machining martensitic: valve trim, motor shafts, screw-machine parts |
| 420 | S42000 | 1.4021 / 1.4028 | X20Cr13 / X30Cr13 | SUS420J1 / SUS420J2 | Hardenable: pump shafts, cutlery, moulds, surgical tools |
| 431 | S43100 | 1.4057 | X17CrNi16-2 | SUS431 | High-strength hardened and tempered shafts, propeller shafts, bolts |
| 630 (17-4PH) | S17400 | 1.4542 | X5CrNiCuNb16-4 | SUS630 | Precipitation-hardened shafts, valve stems, aerospace and oilfield parts |
| 2205 | S32205 / S31803 | 1.4462 | X2CrNiMoN22-5-3 | SUS329J3L | High-strength chloride-resistant shafts and fasteners, seawater pumps |
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