Hastelloy C2000 Socket weld (SW) flanges are a robust connection type where the pipe inserts into a recessed socket before fillet welding, ensuring a strong, leak-proof joint. Under ASME B16.5, these flanges are specified for sizes from 1/2" to 3" in pressure classes up to 2500, though availability varies by class.
For Hastelloy C2000 SW flanges, the material conforms to ASTM B564 for forgings, ensuring the alloy's corrosion resistance pairs seamlessly with the flange's structural design.
Our factory produces these flanges with precision forging and CNC machining, adhering strictly to ASME B16.5.
Material Properties of Hastelloy C2000
Hastelloy C2000's unique chemistry sets it apart. The nickel base provides ductility and weldability, while chromium and molybdenum bolster oxidation and reducing acid resistance. The 1.6% copper addition is key, improving performance in dilute sulfuric acid and preventing intergranular corrosion.
Mechanical properties include a tensile strength of 760 MPa, a yield strength of 350 MPa, and an elongation of 40%, allowing forming and fabrication without cracking. Thermal conductivity ranges from 9.1 W/m·°C at room temperature to 21.6 W/m·°C at 600°C, and the coefficient of thermal expansion is 12.4 μm/m·°C from 25 to 100°C. These attributes make it suitable for flanges in heat exchangers and reactors.
In terms of corrosion, Hastelloy C2000 resists uniform attack in boiling 45% sulfuric acid better than competitors, with rates under 0.1 mm/year. It also withstands hydrochloric acid up to 10% at boiling and hydrofluoric acid across concentrations, which is ideal for fluoride-bearing processes.
Overview of Socket Weld Flanges
SW flanges feature a socket for pipe insertion, followed by a single fillet weld on the hub's exterior.
ASME B16.5 limits SW flanges to NPS 1/2 to 3 for most classes, as larger sizes favor weld neck designs for better flow and strength.
Tolerances are tight: outside diameter ±1.5 mm for NPS ≤24, inside diameter ±1.0 mm for NPS ≤10, and hub length ±2.0 mm for NPS ≤10.
Raised face (RF) is standard, with 1/16" height for classes 150-300 and 1/4" for higher, enhancing gasket sealing.
ASME B16.5 Hastelloy C2000 SW Flange Specification
Dimensions are standardized by pressure class and nominal pipe size (NPS). Below are tables for key classes, with values in inches.
Class 150 SW Flange Dimensions
|
NPS |
Outside Diameter (O) |
Thickness (T) |
Raised Face Diameter (R) |
Hub Length (Y) |
Hub Diameter (X) |
Socket Bore (B) |
Socket Depth (D) |
Bolt Circle (C) |
Bolt Holes |
Hole Diameter |
|
1/2 |
3.50 |
0.44 |
1.38 |
0.63 |
1.19 |
0.88 |
0.38 |
2.38 |
4 |
0.63 |
|
3/4 |
3.88 |
0.50 |
1.69 |
0.63 |
1.50 |
1.09 |
0.44 |
2.75 |
4 |
0.63 |
|
1 |
4.25 |
0.56 |
2.00 |
0.69 |
1.94 |
1.36 |
0.50 |
3.13 |
4 |
0.63 |
|
1-1/4 |
4.63 |
0.63 |
2.50 |
0.81 |
2.31 |
1.70 |
0.56 |
3.50 |
4 |
0.63 |
|
1-1/2 |
5.00 |
0.69 |
2.88 |
0.88 |
2.56 |
1.95 |
0.63 |
3.88 |
4 |
0.63 |
|
2 |
6.00 |
0.75 |
3.63 |
1.00 |
3.06 |
2.44 |
0.69 |
4.75 |
4 |
0.75 |
|
2-1/2 |
7.00 |
0.88 |
4.13 |
1.13 |
3.56 |
2.94 |
0.75 |
5.50 |
4 |
0.75 |
|
3 |
7.50 |
0.94 |
5.00 |
1.19 |
4.25 |
3.57 |
0.81 |
6.00 |
4 |
0.75 |
Class 300 SW Flange Dimensions
|
NPS |
Outside Diameter (O) |
Thickness (T) |
Raised Face Diameter (R) |
Hub Length (Y) |
Hub Diameter (X) |
Socket Bore (B) |
Socket Depth (D) |
Bolt Circle (C) |
Bolt Holes |
Hole Diameter |
|
1/2 |
3.75 |
0.56 |
1.38 |
0.88 |
1.50 |
0.88 |
0.38 |
2.63 |
4 |
0.63 |
|
3/4 |
4.63 |
0.63 |
1.69 |
1.00 |
1.88 |
1.09 |
0.44 |
3.25 |
4 |
0.75 |
|
1 |
4.88 |
0.69 |
2.00 |
1.06 |
2.13 |
1.36 |
0.50 |
3.50 |
4 |
0.75 |
|
1-1/4 |
5.25 |
0.75 |
2.50 |
1.06 |
2.50 |
1.70 |
0.56 |
3.88 |
4 |
0.75 |
|
1-1/2 |
6.13 |
0.81 |
2.88 |
1.19 |
2.75 |
1.95 |
0.63 |
4.50 |
4 |
0.88 |
|
2 |
6.50 |
0.88 |
3.63 |
1.31 |
3.31 |
2.44 |
0.69 |
5.00 |
8 |
0.75 |
|
2-1/2 |
7.50 |
1.00 |
4.13 |
1.50 |
3.94 |
2.94 |
0.75 |
5.88 |
8 |
0.88 |
|
3 |
8.25 |
1.13 |
5.00 |
1.69 |
4.63 |
3.57 |
0.81 |
6.63 |
8 |
0.88 |
Class 600 SW Flange Dimensions
|
NPS |
Outside Diameter (O) |
Thickness (T) |
Raised Face Diameter (R) |
Hub Length (Y) |
Hub Diameter (X) |
Socket Bore (B) |
Socket Depth (D) |
Bolt Circle (C) |
Bolt Holes |
Hole Diameter |
|
1/2 |
3.75 |
0.56 |
1.38 |
0.88 |
1.50 |
0.88 |
0.38 |
2.63 |
4 |
0.63 |
|
3/4 |
4.63 |
0.63 |
1.69 |
1.00 |
1.88 |
1.09 |
0.44 |
3.25 |
4 |
0.75 |
|
1 |
4.88 |
0.69 |
2.00 |
1.06 |
2.13 |
1.36 |
0.50 |
3.50 |
4 |
0.75 |
|
1-1/4 |
5.25 |
0.81 |
2.50 |
1.13 |
2.50 |
1.70 |
0.56 |
3.88 |
4 |
0.88 |
|
1-1/2 |
6.13 |
0.88 |
2.88 |
1.25 |
2.75 |
1.95 |
0.63 |
4.50 |
4 |
0.88 |
|
2 |
6.50 |
1.00 |
3.63 |
1.50 |
3.31 |
2.44 |
0.69 |
5.00 |
8 |
0.75 |
|
2-1/2 |
7.50 |
1.13 |
4.13 |
1.69 |
3.94 |
2.94 |
0.75 |
5.88 |
8 |
0.88 |
|
3 |
8.25 |
1.25 |
5.00 |
1.88 |
4.63 |
3.57 |
0.81 |
6.63 |
8 |
0.88 |
Higher classes like 900, 1500, and 2500 follow similar patterns but with thicker sections for elevated pressures.
Note:
Class 2500 omits SW flanges per ASME B16.5, favoring weld necks for integrity. Weights vary; a Class 150 2" flange in Hastelloy C2000 weighs about 3-4 lbs, calculated via density and volume.
Why Choose Our Products
Partnering with us means accessing premium Hastelloy C2000 sourced from certified mills, machined to tolerances exceeding ASME requirements.
Our competitive lead times (4-6 weeks) and global shipping support projects worldwide. Clients report 30-50% maintenance savings, underscoring our value.
Contact us to discuss your needs.
