303 stainless steel—free machining version of 304 via addition of sulfur and phosphorus. Also referred to as "A1" in accordance with ISO 3506.
303 stainless steel is used in applications that require parts to be heavily machined. These applications include: Nuts and bolts,Screws,Gears,Aircraft fittings,Bushings,Shafts.
303 stainless steel material chemical composition:
| Grade | Chemical Composition(%) | |||||||||
| 303 | C | Si | Mn | P | S | Cr | Ni | Mo | ||
| ≤0.15 | ≤1.00 | ≤2.00 | ≤0.20 | ≥0.15 | 17.00-19.00 | 8.00-10.00 | ≤0.06 | |||
303 stainless steel equivalent material
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 303 | S30300 | 303S31 | 58M | 1.4305 | X8CrNiS18-9 | 2346 | SUS 303 |
303 stainless steel machinability: Excellent speeds and feeds are capable with this material. The addition of sulfur causes a very brittle chip. Many companies now offer premium machinability grades, such as CarTech with their Project 70 and 7000 series.
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