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Stainless Steel 347 |
Related Metals: |
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Project 70 347(tm)
8R40(tm)
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Specifications: |
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AISI 347
AMS 5512
AMS 5556
AMS 5558
AMS 5571
AMS 5575
AMS 5646
AMS 5654
AMS 5674
ASTM A167
ASTM A182
ASTM A193 (347, B8CA)
ASTM A194 (347, B8CA)
ASTM A213
ASTM A240
ASTM A249
ASTM A269
ASTM A271
ASTM A276
ASTM A312
ASTM A314
ASTM A320 (347, B8CA)
ASTM A336
ASTM A358
ASTM A376
ASTM A403
ASTM A409
ASTM A430
ASTM A473
ASTM A479
ASTM A511
ASTM A554
ASTM A580
ASTM A632
ASTM A774
ASTM A778
ASTM A813
ASTM A814
DIN 1.4550
MIL A-23196
MIL S-23195
MIL S-23196
MIL T-6737
QQ S763
QQ S766
UNS S34700
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Chemistry Data |
Carbon |
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0.08 max |
Chromium |
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17 - 19 |
Iron |
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Balance |
Manganese |
|
2 max |
Nickel |
|
9 - 13 |
Niobium |
|
Min:5 x C |
Phosphorus |
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0.045 max |
Silicon |
|
1 max |
Sulphur |
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0.03 max |
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General Information |
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). |
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Applications |
High temperature gaskets and expansion joints, rocket engine parts, aircraft collector rings and exhaust manifolds and chemical production equipment. |
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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. |
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Corrosion Resistance |
Organic media, atmospheric conditions, very weak acids, milk and other dairy products will have little affect on 347. Far superior to unstabilized chromium-nickel steels in terms of corrosion in the range of 800-1500 F(427-816 C).For maximum corrosion res |
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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. |
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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 reattai |
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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. |
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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. |
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Hardening |
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.) |
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0.29 |
Specific Gravity |
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8.03 |
Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) |
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0.12 |
Electrical Resistivity (microhm-cm (at 68 Deg F)) |
|
438 |
Melting Point (Deg F) |
|
2600 |
Modulus of Elasticity Tension |
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28 |
