STAINLESS STEEL - 347 Stainless Steel
Type 347
| AISI 347 |
| AMS 5512 |
| AMS 5556 |
| AMS 5558 (Round Tube- Welded) |
| AMS 5571 (Round Tube- Seamless) |
| AMS 5575 (Round Tube- Welded) |
| AMS 5646 |
| AMS 5654 |
| AMS 5674 |
| ASTM A167 |
| ASTM A182 (Forging - Open Die) |
| ASTM A193 (347, B8CA) |
| ASTM A194 (347, B8CA) (Nuts) |
| ASTM A213 |
| ASTM A240 |
| ASTM A249 |
| ASTM A269 |
| ASTM A271 (Round Tube- Seamless) |
| ASTM A276 |
| ASTM A312 |
| ASTM A314 |
| ASTM A320 (347, B8CA) |
| ASTM A336 (Forging - Open Die) |
| ASTM A358 (Pipe- Welded) |
Type 347
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ASTM A376 (Pipe- Seamless) ASTM A403 ASTM A409 (Pipe- Welded) ASTM A430 ASTM A473 (Forging - Open Die) ASTM A479 ASTM A511 ASTM A554 ASTM A580 ASTM A632 ASTM A774 ASTM A778 (Round Tube- Welded) ASTM A813 (Pipe- Welded) ASTM A814 (Pipe- Welded) DIN 1.4550 MIL A-23196 MIL S-23195 MIL S-23196 MIL T-6737 (Round Tube- Welded) QQ S763 QQ S766 UNS S34700
Physical Data
| Density (lb / cu. in.) | 0.29 |
| Specific Gravity | 8.03 |
| Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) | 0.12 |
| Electrical Resistivity (microhm-cm (at 68 Deg F)) | 438 |
| Melting Point (Deg F) | 2600 |
| Modulus of Elasticity Tension | 28 |
Chemistry Data
| Carbon | 0.08 max |
| Chromium | 17 - 19 |
| Iron | Balance |
| Manganese | 2 max |
| Nickel | 9 - 13 |
| Niobium | Min:5 x C |
| Phosphorus | 0.045 max |
| Silicon | 1 max |
| Sulphur | 0.03 max |
Principal Design Features
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 1650 F (427-899 C).
Applications
High temperature gaskets and expansion joints, rocket engine parts, aircraft collector rings and exhaust manifolds and chemical production equipment.
Welding
- 347 may be welded by all commonly used fusion and resistance methods. Oxyacetylene welding is not recommended. When necessary, use AWS E/ER347 filler metal.
Machinability
- Slightly tougher than 304 stainless, 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.
Hot Working
- Working temperatures of 2100-2250 F (1149-1232 C) are recommended for forging, upsetting and other hot work processes. Do not work this alloy at temperatures below 1700 F ( 927 C). Material must be water quenched or fully annealed after working to reattain maximum corrosion resistance.
Cold Working
- Although this material requires higher initial forces than 304 stainless, it is quite tough and ductile and can be readily stamped, blanked, spun and drawn.
Annealing
- 1850-2000 F (1010-1093 C), water quench. This procedure will result in maximum ductility. For maximum corrosion resistance, see the note on stabilizing anneal under corrosion.
Hardening
- This alloy does not harden by heat treating. Elevated properties may only be obtained through cold reduction.