347 Stainless Steel Detailed Description
Type 347 stainless steel is a stabilized austenitic stainless steel similar to type 304 with an addition of Columbium and Tantalum. The columbium serves to produce a stabilized type of stainless steel which is immune to chromium carbide precipitation. This type of grades are thus recommended for parts fabricated by welding which cannot be susequently annealed or for parts which must operate in service between 800 – 1600°F.
Applications
Collector rings, airplane exhaust stacks, annealing box covers, stainless steel flanges, stainless steel pipe fittings, jet engine parts,expansion joints, stainless steel tubes, stainless steel bars, stainless steel angle bars flexible metal hose and bellows.
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
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)
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 10-6(16.6)
32 -1000°F (0 -538°C): 10.5x 10-6 (18.9)
32 -1500°F (0 -873°C): 11.4 x 10-6 (20.5)
32 – 212°F (0 -100°C): 9.3 x 10-6(16.6)
32 -1000°F (0 -538°C): 10.5x 10-6 (18.9)
32 -1500°F (0 -873°C): 11.4 x 10-6 (20.5)
Modulus of Elasticity: ksi (MPa)
28.0 x 106 (1.93 x 105) in tension
11.2 x 106 (0.78 x 105) in torsion
28.0 x 106 (1.93 x 105) in tension
11.2 x 106 (0.78 x 105) in torsion
Magnetic Permeability: H = 200 Oersteds:
Annealed < 1.02 max.
Melting Range: °F (°C) 2500 – 2550 (1371 – 1400)
Forms
Stainless Steel Bars – stainless steel round bars, stainless steel square bars,stainless steel hex bars,stainless steel angle bars,stainless steel flat bars
Stainless Steel Pipe Fittings – stainless steel buttwelding fittings and stainless steel forged fittings such as stainless steel elbows,stainless steel tees, stainless steel reducer, stainless steel union
Stainless Steel Pipes – stainless steel u tubes, stainless steel tubes
Stainless Steel Flanges – stainless steel slip on flanges (SORF/SOFF), stainless steel weld neck flanges (WNRF), stainless steel blind flanges (BLRF), stainless steel threaded flanges (THRF)
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
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: TemperedType 347 stainless steel can be cold rolled various tempers. Contact Ulbrich Technical Services for additional information.
Additional Properties
Cold Forming347 stainless steel 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
347 stainless steel is non hardenable by heat treatment. It can only be hardened by cold working.
Welding347 stainless steel is weldable by common fusion and resistance methods. Use type 347 or 348 filler rod or electrodes. For best results refer to: Yaang’s “Welding of Stainless Steels and Other Joining Methods”.
Source: Yaang Pipe Industry (www.yaang.com)
