Stainless Steel Machining Data
General Machining Guidelines
| Type No. | UNS No. | Machinability* | Drawing or Stamping | Welding |
|---|---|---|---|---|
| 301 | S30100 | 40% | Good | Very good, tough welds. |
| 302 | S30200 | 40% | Good | Very good, tough welds. |
| 303 | S30300 | 70% | Fairly Good | Fusion welding not recommended. |
| 304 | S30400 | 45% | Very Good | Very good, tough welds. |
| 304L | S30403 | 44% | Very Good | Very good, recommend for welding. |
| 316 | S31600 | 45% | Good | Very good, tough welds. |
| 316L | S31603 | 45% | Good | Very good, recommended for welding. |
| 321 | S32100 | 38% | Good | Very good, tough welds. |
| 410 | S41000 | 60% | Fairly Good | Fair, pre-heat 400-500°F Anneal 1250°F after welding. |
| 416 | S41600 | 85% | Fair | Poor, pre-heat 400-500°F, Anneal 1250°F after welding. |
| 420 | S42000 | 52% | ||
| 430F | S43020 | 85% | ||
| 440C | S44004 | 40% | Not Recommended | Not Recommended |
| 17-4 | S17400 | 40% | Very good, tough welds. |
| Type No. | UNS No. | Machinability* | Drawing or Stamping | Welding |
|---|---|---|---|---|
| 301 | S30100 | 40% | Good | Very good, tough welds. |
| 302 | S30200 | 40% | Good | Very good, tough welds. |
| 303 | S30300 | 70% | Fairly Good | Fusion welding not recommended. |
| 304 | S30400 | 45% | Very Good | Very good, tough welds. |
| 304L | S30403 | 44% | Very Good | Very good, recommend for welding. |
| 316 | S31600 | 45% | Good | Very good, tough welds. |
| 316L | S31603 | 45% | Good | Very good, recommended for welding. |
| 321 | S32100 | 38% | Good | Very good, tough welds. |
| 410 | S41000 | 60% | Fairly Good | Fair, pre-heat 400-500°F Anneal 1250°F after welding. |
| 416 | S41600 | 85% | Fair | Poor, pre-heat 400-500°F, Anneal 1250°F after welding. |
| 420 | S42000 | 52% | ||
| 430F | S43020 | 85% | ||
| 440C | S44004 | 40% | Not Recommended | Not Recommended |
| 17-4 | S17400 | 40% | Very good, tough welds. |
*Based on Beesemer Screw Stock No. B1112
| Type No. | Approximate SFM | % Relative Speed (Based on C1212 as 100%) | Machinability* |
|---|---|---|---|
| 303 | 150 | 75 | 70% |
| 304 | 70 | 40 | 45% |
| 304L | 70 | 40 | 44% |
| 316/316L | 60 | 36 | 45% |
| 321 | 60 | 36 | 38% |
| 347 | 60 | 36 | 38% |
| 410 | 95 | 54 | 60% |
| 416 Ann. | 150 | 75 | 85% |
| 416 HT | 85 | 50 | 85% |
| 418 (Greek Ascoloy) | 96 | 50 | 50% |
| 420 | 85 | 50 | 52% |
| 420F | 125 | 68 | 68% |
| 430 | 110 | 66 | 60% |
| 430F | 150 | 75 | 85% |
| 430 | 80 | 48 | 45% |
| 440A | 65 | 40 | 45% |
| 440C | 65 | 40 | 40% |
| 440FSE | 80 | 48 | 50% |
| 13-8 PH | 60 | 36 | 40% |
| 15-5 PH | 75 | 45 | 45% |
| 17-4 PH | 75 | 45 | 45% |
| 17-4 PH H1150 | 85 | 50 | 45% |
| 17-7 PH | 50 | 22 | 25% |
| Nitronic 40 | 50 | 22 | 25% |
| Nitronic 50 | 50 | 22 | 25% |
| Nitronic 60 | 50 | 22 | 25% |
| Type No. | Approximate SFM | % Relative Speed (Based on C1212 as 100%) | Machinability* |
|---|---|---|---|
| 303 | 150 | 75 | 70% |
| 304 | 70 | 40 | 45% |
| 304L | 70 | 40 | 44% |
| 316/316L | 60 | 36 | 45% |
| 321 | 60 | 36 | 38% |
| 347 | 60 | 36 | 38% |
| 410 | 95 | 54 | 60% |
| 416 Ann. | 150 | 75 | 85% |
| 416 HT | 85 | 50 | 85% |
| 418 (Greek Ascoloy) | 96 | 50 | 50% |
| 420 | 85 | 50 | 52% |
| 420F | 125 | 68 | 68% |
| 430 | 110 | 66 | 60% |
| 430F | 150 | 75 | 85% |
| 430 | 80 | 48 | 45% |
| 440A | 65 | 40 | 45% |
| 440C | 65 | 40 | 40% |
| 440FSE | 80 | 48 | 50% |
| 13-8 PH | 60 | 36 | 40% |
| 15-5 PH | 75 | 45 | 45% |
| 17-4 PH | 75 | 45 | 45% |
| 17-4 PH H1150 | 85 | 50 | 45% |
| 17-7 PH | 50 | 22 | 25% |
| Nitronic 40 | 50 | 22 | 25% |
| Nitronic 50 | 50 | 22 | 25% |
| Nitronic 60 | 50 | 22 | 25% |
*Based on Bessemer Screw Stock No. B1112