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The following specifications cover
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AISI 347
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AMS 5512
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AMS 5556
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AMS 5558 (Round Tube- Welded)
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AMS 5571 (Round Tube- Seamless)
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AMS 5575 (Round Tube- Welded)
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AMS 5646
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AMS 5654
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AMS 5674
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ASTM A167
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ASTM A182 (Forging - Open Die)
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ASTM A193 (347, B8CA)
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ASTM A194 (347, B8CA) (Nuts)
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ASTM A213
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ASTM A240
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ASTM A249
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ASTM A269
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ASTM A271 (Round Tube- Seamless)
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ASTM A276
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ASTM A312
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ASTM A314
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ASTM A320 (347, B8CA)
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ASTM A336 (Forging - Open Die)
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ASTM A358 (Pipe- Welded)
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ASTM A376 (Pipe- Seamless)
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ASTM A403
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ASTM A409 (Pipe- Welded)
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ASTM A430
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ASTM A473 (Forging - Open Die)
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ASTM A479
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ASTM A511
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ASTM A554
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ASTM A580
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ASTM A632
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ASTM A774
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ASTM A778 (Round Tube- Welded)
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ASTM A813 (Pipe- Welded)
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ASTM A814 (Pipe- Welded)
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DIN 1.4550
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MIL A-23196
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MIL S-23195
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MIL S-23196
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MIL T-6737 (Round Tube- Welded)
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QQ S763
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QQ S766
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UNS S34700 |
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8R40 (tm)
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Project 70 347 (tm) |
| 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
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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). |
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| Applications |
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High temperature gaskets and
expansion joints, rocket engine parts, aircraft collector
rings and exhaust manifolds and chemical production equipment.
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| Machinability |
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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. |
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| Welding |
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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. |
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| Hot Working |
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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. |
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| Cold Working |
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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. |
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| Annealing |
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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. |
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| Hardening |
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This alloy does not harden by
heat treating. Elevated properties may only be obtained
through cold reduction. |
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Physical Data :
| Density (lb / cu.
in.) |
0.29 |
| Specific Gravity
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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 |
Mechanical Data :
There is no Mechnical data available for this grade |
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