Similar to 321 stainless, 347 uses Columbium as a stabilizing element to maximize its principal feature: resistance to intergranular corrosion. It can be used in applications requiring repeated heating in the range of 800 and 1650ºF (427-899ºC). 347 is a general purpose austenitic stainless steel with a face centered cubic structure. It is essentially non-magnetic in the annealed condition and can only be hardened by cold working.
| AISI 347 – UNS S34700 | |||
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Slightly tougher than 304 stainless steel, this material will produce the same tough stringy chips. The use of slow speeds and constant
positive feeds will minimize this alloy’s tendency to work harden.
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| AISI 347 – UNS S34700 | |
| Product | Norm ASTM |
| Seamless Tubes | A-213 A-312 |
| Welded Tubes | A-249 A-312 |
| Plates | A-240 |
| Bars | A-276 A-479 |
| Flanges | A-182 |
| Fittings | A-403 |
Chemical specifications %
| AISI 347 – UNS S34700 | ||
| Element | Simbol | Maximum |
| Carbon | C | 0,08 |
| Manganese | Mn | 2,0 |
| Sulfur | S | 0,03 |
| Silicon | Si | 1,0 |
| Nickel | Ni | 9,0-12,0 |
| Chrome | Cr | 17,0-19,0 |
| Phosphorus | P | 0,045 |
| Columbio | Cb | 10xC < 1,10 |
| Iron | Fe | Balance |
Mechanical Properties
| AISI 347 – UNS S34700 | |||||||
| Norm | Rm min. | Rp 0,2% min. | E4d min.% | Z min.% | T.I.(J) | HR B | HB |
| A-182 | 75 (515) | 30 (205) | 30 | ||||
| A-213 | 75 (515) | 30 (205) | 35 | 90 | 192 | ||
| A-240 | |||||||
| A-249 | 75 (515) | 30 (205) | 35 | 90 | |||
| A-276 | 75 (515) | 30 (205) | 40 | 50 | |||
| A-312 | 75 (515) | 30 (205) | |||||
| A-403 | 75 (515) | 30 (205) | 30 | ||||
| A-479 | 75 (515) | 30 (205) | 30 | 40 | |||
