Stainless Steel 347 (AMS 5512 / AMS 5646)

Technical Data Sheet

Alloy 347 is a chromium nickel stainless steel which has been modified by the addition of columbium and tantalum. The main advantage of this is an excellent resistance to intergranular corrosion which is common to other austenitic stainless steels following exposure to temperatures of 800° to 1500°F. Type 347 has about the same general corrosion resistance as Type 302.

Alloy 347 is generally used where corrosive conditions are severe, such as aircraft exhaust stacks, manifolds and ring collectors. Type 347 is also used for heavy welded assemblies which cannot be annealed after welding or where the operating conditions cause exposure within the temperature range between 800° to 1500°F.


Chemical Composition Limits
Weight% C P Si Ni Mn S Cr Cb + Ta Fe Co Mo Cu
347 0.08 max 0.040 max 1.00 max 9-12 2.0 max 0.030 max 17-19 10 x C min Bal 1.00 max
only AMS 5646
0.75 max 0.75 max
347H 0.04-0.10 0.040 max 1.00 max 9-12 2.0 max 0.030 max 17-19 10 x C min Bal      

Typical Mechanical Properties


Material Yield Strength (ksi) Tensile Strength (ksi) % Elongation Hardness HB
Alloy 347
Sheet (Sol Trtd)
AMS 5512
25 70-105 40 -
Alloy 347
Bar (Sol Trtd)
AMS 5646
- - - 255 max

Alloy 347 is available in Sheet, Plates, Bars (Flat, Hex, Round, Square), Forging Stock, Tube , Welding Wire. 347 Foil (Shim) is available in various thicknesses. View stock list for further information. Foil Stock List, Sheet Stock List, Plate Stock List. contact Sales for further availability.

347 / 347H
AMS 5512 Sheet / strip / plate (steel, corrosion and heat resistant, sheet, strip and plate 18Cr 10.5Ni)
AMS 5556 Seamless/ welded tube
AMS 5558 Welded /thin wall tube
AMS 5571 Seamless tube
AMS 5575 Welded tube
AMS 5646 Bars / wire / forging
AMS 5654 Bars (aircraft quality)
AMS 5674 Wire
AMS 5680 Wire
MIL-T-8606 Seamless tube
MIL-T-8606 Welded tube
MIL-T-8808 Seamless tube
MIL-T-8808 Welded tube
ASTM A240 / ASME SA240
ASTM A167 / ASME SA167
ASTM A276 / ASME SA276
ASTM A314 / ASME SA314
ASTM A479 / ASME A479
BS 2S130
BS 2T66 Tube
BS T72 Tube
BS S527 Sheet
BS 970; 347S17
EN58F / EN58G
MSRR 6522
MSRR 6524
WS 1.4544
WS 1.4546
WS 1.4550
WS 1.5446*Tube
UNS S30347

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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.