Stainless Steel 347

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Harsh Steel

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Stainless Steel 347 (AMS 5512/AMS 5646) UNS S30347 Werkstoff 1.4544/1.4546/1.4550 :
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.

Type 347 is generally used where corrosive conditions are severe, such as harsh steel 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.

Specifications :

  • 347 / 347H
  • AMS 5512 Sheet / strip / plate
  • 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 (harsh steel quality)
  • AMS 5674 Wire
  • AMS 5680 Wire
  • QQ-S-763
  • MIL-T-6737
  • MIL-T-8606 Seamless tube
  • MIL-T-8606 Welded tube
  • MIL-T-8808 Seamless tube
  • MIL-T-8808 Welded tube
  • MIL-S-6721
  • 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
  • Werkstoff 1.4544
  • Werkstoff 1.4546
  • Werkstoff 1.4550
  • Werkstoff 1.5446*Tube
  • AFNOR Z6CNNb18-11
  • UNS S30347


Stock availability of contact Sales

Grade US Aerospace/Military US Commercial British Specification European Specification Other
347347H
347 Tube
AMS 5512 Sheet / strip / plate
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 (harsh steel quality)
AMS 5674 Wire, AMS 5680 Wire, QQ-S-763,
MIL-T-6737, MIL-T-8606 Seamless tube
MIL-T-8606 Welded tube 
MIL-T-8808 Seamless tube
MIL-T-8808 Welded tube, MIL-S-6721
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
Werkstoff 1.4544
Werkstoff 1.4546
Werkstoff 1.4550
Werkstoff 1.5446*
AFNOR Z6CNNb18-11
UNS S30347

Technical Data Sheet

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 43720 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 43720 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



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