347 Stainless Steel Wire UNS S34700

Shaped, Flat, Square, Round, Fine, Plated and Bare Wire ASTM A240, ASTM 313, ASTM 580, AMS 5512, AMS 5546

347 Alloy Description

Alloy 347 is a stabilized stainless steel similar to type 304 with an addition of Columbium and Tantalum. Columbium
stabilizes this alloy making it immune to chromium carbide precipitation. Alloy 347 is recommended for welded applications that can not tolerate a post anneal. The alloy can operate between 800-1600°F.

Applications

Header bars in heat exchangers
Aircraft exhaust parts
Expansion joints
Fasteners

Chemistry Typical

Carbon: 0.08 max
Manganese: 2.00 max
Silicon: 0,75 max
Chromium: 17.00-19.00
Nickel: 9.00-12.00
Molybdenum: 0.75 max
Columbium + Tantalum: 10 x (Carbon + Nitrogen) min-1.00 max
Phosphorus: 0.040 max
Sulfur: 0.030 max
Copper: 0.75 max
Iron: Balance

Physical Properties

Density: 0.288 lbs/in³, 7.97 g/cm³

Electrical Resistivity: microhm-in (microhm-cm):
68°F (20°C): 28.7 (73)

Specific Heat: BTU/lb/°F (kJ/kg•K):
32-212°F (0-100°C): 0.12 (0.50)

Thermal Conductivity: BTU/hr/ft²/ft/°F (W/m•K)
At 212°F (100°C): 9.3 (16.0)
At 932°F (500°C): 12.8 (22.0)

Mean Coefficient of Thermal Expansion:in/in/°F (μm/m•K)
32-212°F (0-100°C): 9.3 x 10 (16.6)
32-1000°F (0-538°C): 10.5x 10 (18.9)
32-1500°F (0-873°C): 11.4 x 10 (20.5)

Modulus of Elasticity: KSI (MPa)
28.0 x 10³ (1.93 x 10³) in tension
11.2 x 10³ (0.78 x 10³) in torsion

Magnetic Permeability: H = 200 Oersteds:

Annealed < 1.02 max.

Melting Range: °F (°C) 2500 – 2550 (1371 – 1400)

Mechanical Properties at Room Temperature

Properties: Annealed

Ultimate Tensile Strength: 75 KSI min (515 MPa min)
Yield Strength (0.2% offset): 30 KSI min (205 MPa min)
Elongation: 40% min
Hardness: Rb 92 max

Properties Tempered

Alloy 347 can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for recommendations.
Standard Wire Finishes
Extra Clean: (XC) Extra clean is also referred to as “bright annealed” or “bright annealed and cold rolled”
Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for
decorative applications
Soap (round wire only): Soap is used as a lubricant in the drawing process and is not
removed. It acts as a lubricant during customer part forming operation. A soap finish is
available in tempered products.
Plated: Many plating options are available.
∗Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating requests.

Forms

Continuous Coils
Cut to lengths
Precision cutting

Cold Forming

Alloy 347 can be readily formed and drawn. Like most other austenitic stainless steels, type 347 work hardens and may require annealing after severe forming.

Heat Treatment

Alloy 347 is non hardenable by heat treatment. It can only be hardened by cold working

Welding

Alloy 347 is weldable by common fusion and resistance methods. For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”.

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.