+91-9619103479
or
vishal@solitaire-overseas.com
Carbon Steel Socket Weld Flanges are specially designed pipe fittings that perform well under small-diameter, high-pressure environments where the joints need to be leak-proof and durable. They have a recessed socket shoulder that allows the pipe to be inserted easily using only one external weld rather than several internal welds, making installation easier and providing much higher fatigue strength than regular slip-on connectors do. Other than industrial applications, modern piping systems and complex piping arrangements are also often created according to some principles similar to those found in strategic board games like solitaire, where every component has to occupy its predetermined place. Makers of Carbon Steel Socket Weld Flanges use heavy duty forging materials like ASTM A105 that guarantee excellent fluid flow, minimal drop in pressure, and high durability. Solitaire Overseas manufactures and supplies carbon steel socket weld flanges with mill test certification.
| Parameter | Specification |
|---|---|
Standard |
ASTM A105, ASME B16.5, BS 3293, DIN 2633, MSS SP44 |
Size Range |
NPS 1/2 inch to 3 inches (DN 15 to DN 80) |
Pressure Class |
Class 150, 300, 600, 900, 1500, 2500 |
Facing |
Raised Face, Flat Face or Ring Type Joint |
Construction |
Forged, recessed socket bore, single external fillet weld |
Testing |
Hydrostatic test, third party inspection on request |
Certification |
Mill Test Certificate EN 10204 3.1, 3.2 on request |
| Element | A105 | A350 LF2 |
|---|---|---|
Carbon max |
0.35 |
0.30 |
Manganese |
0.60 to 1.05 |
0.60 to 1.35 |
Phosphorus max |
0.035 |
0.035 |
Sulfur max |
0.040 |
0.040 |
Silicon |
0.10 to 0.35 |
0.15 to 0.30 |
| Grade | Tensile Strength min | Yield Strength min | Elongation min (%) |
|---|---|---|---|
A105 |
485 MPa (70 ksi) |
250 MPa (36 ksi) |
22 |
A694 F60 |
586 MPa (85 ksi) |
415 MPa (60 ksi) |
18 |
A350 LF2 |
485 MPa (70 ksi) |
250 MPa (36 ksi) |
22 |
| Class | Approximate Rating at Ambient (psi) | Approximate Rating at Ambient (bar) |
|---|---|---|
150 |
285 |
20 |
300 |
740 |
51 |
600 |
1480 |
102 |
900 |
2220 |
153 |
1500 |
3705 |
255 |
2500 |
6170 |
425 |
Request a Quote Today and discuss your Carbon Steel Socket Weld Flange requirements with our team.
The following data table provides standard dimensions and estimated weights for ASME B16.5 Class 150 Carbon Steel Socket Weld Flanges. Measurements are listed in inches, with weights given in pounds and kilograms.
| NPS (Inches) | Outside Diameter (in) | Flange Thickness (in) | Bore Diameter (in) | Socket Depth (in) | Bolt Circle Diameter (in) | Number of Bolts | Approx Weight (lbs) | Approx Weight (kg) |
|---|---|---|---|---|---|---|---|---|
1/2 |
3.50 |
0.44 |
0.88 |
0.38 |
2.38 |
4 |
1.0 |
0.45 |
3/4 |
3.88 |
0.50 |
1.09 |
0.44 |
2.75 |
4 |
2.0 |
0.90 |
1 |
4.25 |
0.56 |
1.36 |
0.50 |
3.12 |
4 |
2.0 |
0.90 |
1 1/4 |
4.62 |
0.62 |
1.70 |
0.56 |
3.50 |
4 |
3.0 |
1.36 |
1 1/2 |
5.00 |
0.69 |
1.95 |
0.62 |
3.88 |
4 |
3.0 |
1.36 |
2 |
6.00 |
0.75 |
2.44 |
0.69 |
4.75 |
4 |
5.0 |
2.27 |
2 1/2 |
7.00 |
0.88 |
2.94 |
0.75 |
5.50 |
4 |
7.0 |
3.18 |
3 |
7.50 |
0.94 |
3.57 |
0.81 |
6.00 |
4 |
8.0 |
3.63 |
| Size | ID/OD | Bolt Circle (BC) | Raised Face (R) | Raised Face (RF) ID | HD ID | 2× Raised Face Thickness (T) | T1 | Flat Face Thickness (T2) | Bolt Hole (B) | No. of Bolt Holes |
|---|---|---|---|---|---|---|---|---|---|---|
1/2" |
0.88" |
3.75" |
2.62" |
1.38" |
0.063" |
1.50" |
0.38" |
0.62" |
0.88" |
4 |
3/4" |
1.09" |
4.62" |
3.25" |
1.69" |
0.063" |
1.88" |
0.44" |
0.82" |
1.00" |
4 |
1" |
1.36" |
4.88" |
3.50" |
2.00" |
0.063" |
2.12" |
0.50" |
1.05" |
1.06" |
4 |
1-1/4" |
1.70" |
5.25" |
3.88" |
2.50" |
0.063" |
2.50" |
0.56" |
1.38" |
1.06" |
4 |
1-1/2" |
1.97" |
6.12" |
4.50" |
2.88" |
0.063" |
2.75" |
0.62" |
1.61" |
1.19" |
4 |
2" |
2.44" |
6.50" |
5.00" |
3.62" |
0.063" |
3.31" |
0.69" |
2.07" |
1.31" |
8 |
2-1/2" |
2.94" |
7.50" |
5.88" |
4.12" |
0.063" |
3.94" |
0.75" |
2.47" |
1.50" |
8 |
3" |
3.57" |
8.25" |
6.62" |
5.00" |
0.063" |
4.62" |
0.81" |
3.07" |
1.69" |
8 |
| Class | Nominal Pipe Size (NPS) | Socket Weld |
|---|---|---|
150 lb |
½" |
2 |
150 lb |
¾" |
2 |
150 lb |
1" |
2 |
150 lb |
1¼" |
3 |
150 lb |
1½" |
3 |
150 lb |
2" |
5 |
150 lb |
2½" |
8 |
150 lb |
3" |
9 |
150 lb |
3½" |
11 |
150 lb |
4" |
13 |
150 lb |
5" |
15 |
150 lb |
6" |
19 |
150 lb |
8" |
30 |
150 lb |
10" |
43 |
150 lb |
12" |
64 |
150 lb |
14" |
90 |
150 lb |
16" |
98 |
150 lb |
18" |
130 |
150 lb |
20" |
165 |
150 lb |
22" |
185 |
150 lb |
24" |
220 |
| Class | Nominal Pipe Size (NPS) | Socket Weld |
|---|---|---|
300 lb |
½" |
3 |
300 lb |
¾" |
3 |
300 lb |
1" |
3 |
300 lb |
1¼" |
4 |
300 lb |
1½" |
6 |
300 lb |
2" |
7 |
300 lb |
2½" |
10 |
300 lb |
3" |
13 |
300 lb |
3½" |
17 |
300 lb |
4" |
22 |
300 lb |
5" |
28 |
300 lb |
6" |
39 |
300 lb |
8" |
58 |
300 lb |
10" |
81 |
300 lb |
12" |
115 |
300 lb |
14" |
165 |
300 lb |
16" |
190 |
300 lb |
18" |
250 |
300 lb |
20" |
315 |
300 lb |
22" |
370 |
300 lb |
24" |
475 |
The gap allows thermal expansion and movement without transferring excessive stress into the weld. Closing it can reduce flexibility and cause workmanship problems.
Above 4-inch, socket weld geometry and stress concentrations become less favorable, making weld neck flanges a more reliable choice.
Not quite. Socket welds are more vulnerable to fatigue cracking, so weld neck flanges are preferred for severe cyclic or fatigue-critical service.
Yes. A350 LF1 and LF2 are available. LF2 is more commonly specified and is qualified for temperatures down to −46°C.
Threaded flanges screw onto the pipe without welding. Socket weld flanges use a fillet weld and are generally preferred for higher-pressure small-bore piping.
Contact Solitaire Overseas Today for pricing, technical details, and supply requirements.