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Type 303 (S30300) is a fully re-sulfurized free-machining austenitic stainless steel melted and processed to maximize machinability. It should be considered where extensive machining is required and some sacrifice in corrosion resistance compared to type 304 can be tolerated. In the annealed condition, it’s non-magnetic, but may become magnetic as a result of cold working.
| Weight % | C | Mn | Si | Cr | Ni | P | S | Mo | Fe |
|---|---|---|---|---|---|---|---|---|---|
| minimum | — | — | — | 17.00 | 8.00 | — | 0.15 | — | Remainder |
| maximum | 0.15 | 2.00 | 1.00 | 19.00 | 10.00 | 0.20 | — | 0.6 |
| Characteristics | English | Metric | ||
|---|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.29 lbs/in3 | 8.00 g/cm3 | ||
| Melting range | 2550°F-2590°F | 1400°C-1420°C | ||
| Specific heat
(212 °F/100°C) |
0.12 BTU/lb – °F | 500 J/KG- °K | ||
| Coefficient of thermal expansion | 32°F – 212°F
0°C – 100°C |
9.6 micro in/in- °F | 17.2 micro m/m- °K | |
| 32°F – 600°F
0°C – 315°C |
9.9 micro in/in- °F | 17.8 micro m/m- °K | ||
| 32°F – 1000°F
0°C – 538°C |
10.2 micro in/in- °F | 18.4 micro m/m- °K | ||
| Thermal conductivity
|
100°C | 9.4 BTU/ft- hr – °F | 16.2 W/m – °K | |
| 500°C | 12.4 BTU/ft- hr – °F | 21.5 W/m – °K | ||
| Electrical properties | Electrical resistivity | 720 nΩ ∙ m | ||
| Magnetic parambility | 1.02 | |||
| Condition | Tensile | Reduction | Fatigue strength | Modulus of Elasticity | Hardness | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation | Of area | Brinell | |||||||
| KSI | MPa | KSI | MPa | Lo | % | KSI | MPa | KSIx103 | GPa | ||
| Annealed
bar / rod |
90 | 620 | 35 | 240 | 40 | 50 | 35 | 240 | 28.0 | 193 | 160 |
| Cold drawn bar / rod | 100 | 690 | 60.2 | 415 | — | — | 35 | 240 | 28.0 | 193 | 228 |
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