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Type 303 Se (S30323) is a modification of basic 303 that substitutes selenium for sulfur as an aid to machining. It offers good strength, corrosion resistance and great machinability. It will resist scaling at temperatures up to 1600°F (871°C). Commonly employed in parts requiring cold forming after machining.
| Weight % | C | Mn | Si | Cr | Ni | P | S | Se | Fe |
|---|---|---|---|---|---|---|---|---|---|
| minimum | — | — | — | 17.00 | 8.00 | — | — | 0.15 | Remainder |
| maximum | 0.15 | 2.00 | 1.00 | 19.00 | 10.00 | 0.20 | 0.06 | — |
| 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 | Modulus of Elasticity | Hardness | |||||
|---|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation
at break |
Of area | Brinell | |||||
| KSI | MPa | KSI | MPa | % | % | KSIx103 | GPa | ||
| Annealed
bar / rod |
90 | 620 | 35 | 240 | 50 | 50 | 28.0 | 193 | 160 |
| Cold drawn
bar / rod |
100 | 690 | 60.2 | 415 | 40 | — | 28.0 | 193 | 228 |
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