Type 347 is a niobium stabilized chromium nickel austenitic stainless steel with corrosion resistance similar to 304/304L.
This grade is typically used in the 800-1500˚F temperature range where it is stabilized against chromium carbide precipitation by the addition of niobium, which results in the precipitation of niobium carbides. Type 347 has excellent intergranular corrosion resistance after exposure to this temperature range, and this grade resists oxidation up to 1500˚F and has higher creep and stress rupture properties than 304/304L. It also possesses good low temperature toughness and is non-magnetic in the annealed condition.
The ASTM A182 F347 Flange is known for its strength and durability. It is designed to withstand high pressure and temperature, making it ideal for challenging environments. The flange is available in various sizes and types, including weld neck(WN), slip-on(SO), blind, and socket weld(SW), etc.
Stainless steel 347 flange Chemical Composition
Element
|
347
|
Carbon
|
0.08
|
Chromium
|
17.0-19.0
|
Nickel
|
9.0-13.0
|
Manganese
|
2.00
|
Silicon
|
0.75
|
Phosphorus
|
0.045
|
Sulfur
|
0.030
|
Niobium
|
10 x C min / 1.00 max
|
* Maximum, unless range is indicated
ASTM A182 F347 Flange Mechanical Properties
Property
|
347
|
Yield Strength, min. (ksi)
|
30
|
Tensile Strength, min. (ksi)
|
75
|
Elongation, min. (%)
|
40
|
Hardness, max. (Rb)
|
92
|
ASTM A182 F347 Flange is widely used in industries such as chemical processing, food processing, and oil and gas production. The stainless steel 347 material provides excellent resistance to corrosion, particularly in high-temperature environments.