Austenitic SS 347 Fittings and Flanges
Stainless Steel 347 Fittings and Stainless Steel 347 Flanges combine excellent mechanical properties over a wide temperature range with superior oxidation and corrosion resistance. Alloy 347 is a columbium and austenitic stainless steel which provides good corrosion resistance and oxidation resistance.
Chemical Properties
|
GRADE |
Cr |
Ni |
C |
Mn |
P |
Si |
Fe |
S |
Cb) |
|
|---|---|---|---|---|---|---|---|---|---|---|
|
SS 347H |
MIN |
17 |
9 |
0.04 |
– |
– |
– |
– |
10 x (C) |
|
|
MAX |
19 |
13 |
0.1 |
2 |
0.045 |
1 |
BALANCE |
0.03 |
1 |
|
|
SS 347 |
MIN |
17 |
9 |
– |
– |
– |
– |
– |
8 x (C) |
|
|
MAX |
19 |
13 |
0.08 |
2 |
0.045 |
1 |
BALANCE |
0.03 |
1 |
Properties
Alloy 347 and 347H fittings and flanges both alloy cannot be hardened by heat treatment but it becomes hard by doing a cold working process. It can easily be welded and has low ductility and is easy to form. Alloy 347h stainless steel has higher carbon content and it is an updated version of 347 alloys. It has excellent creep strength at 1000 degrees F and has a high strength too.
PHYSICAL PROPERTIES
|
Grade |
Density (Kg/m3) |
Melting range |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (μm/m/°C) at 0-100°C |
Thermal Conductivity (W/m.K) at 100°C |
Specific Heat (J/Kg.K) at 20°C |
Electric Resistivity at 20°C Ω mm2 /m |
|---|---|---|---|---|---|---|---|
|
SS 347/347H |
7.96 |
1398-1446 °C |
190-210 |
17.3 |
16.3 |
500 |
0.73 |
Alloy 347 stainless fittings and flanges exhibit good general corrosion resistance that is comparable to 304. The alloy has good oxidation resistance and creep strength to 1500°F (816°C). It also possesses good low temperature toughness.
Specification of Flange
The specified ASTM Standard Specification for Wrought Austenitic SS 347 Flanges is ASTM A182 with manufacturing standard such as ANSI/ASME B16.5, B16.48, BS4504, B 16.47 Series A & B, BS 10, EN-1092, DIN, etc.
Mechanical Properties of Flange
|
Grade |
Tensile Strength |
Yield Strength |
Elongation |
Reduction of area |
|---|---|---|---|---|
|
[MPA] |
[MPA] |
(% in 50mm) min |
min % |
|
|
SS 347 |
515 |
205 |
30 |
50 |
|
SS 347H |
515 |
205 |
30 |
50 |
According to application and uses in pipes and tubes SS 347/H flanges are broadly grouped into different sort, for example, Welding Neck Flange(WNF) & Long Welding Neck Flange(LWNF), Slip-on Flange(SOF), Lap Joint Flange(LJW), Blind Flange, Socket Welding Flange (SWF), Threaded Flange(THW), Plate Flange.
SS 347 Flanges for the most part has different face type, for example, Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), blind flange, with various class rating as 50 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16,din 2.4856 , 25, 40 & ANSI B16.5.
Specification of Fittings
The Specification for Wrought Austenitic SS 347 Fittings is ASTM A403, having Specific manufacturing Standards as ASME/ANSI B16.9, ASME B16.28, MSS-SP-43.
Mechanical Properties of Fittings
|
Grade |
Tensile Strength |
Yield Strength |
|---|---|---|
|
[MPA] |
[MPA] |
|
|
SS 347/H |
515 |
205 |
SS 347/347H Fittings are categorically available are Elbow, Reducer, Tee, Coupling, Bend, Stub End, Cap, Nipple, Washer, Cross, Union etc. which are available in different types such as Welded, Seamless and Fabricated having thickness range from 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS available with NACE MR 01-75
Application
SS 347 Fittings and SS 347 Flanges are made especially for fastener application where need for superior performance in the corrosion environmental conditions. 347 flanges have fatigue strength at room temperature. The flanges and Fittings are used in chemical processes and boiler equipment because of its high temperature tolerating quality.
They are also used in specific industry such as :
- Pharmaceuticals Industry
- Pulp & Paper Industry
- Food Processing Industry
- Aerospace Industry
- Refining Industry
