This order is one of several placed with us by our domestic client. The product ordered is ASTM A182 F316L socket weld flange. This flange offers excellent corrosion resistance and high-temperature performance, making it particularly suitable for industries such as chemical processing, oil and gas, and marine engineering. Although the order quantity was modest, the 316L austenitic stainless steel material demanded high standards for corrosion resistance and machining precision. We nonetheless completed production and inspection within the shortest possible timeframe and delivered on schedule.
This not only demonstrates our flexibility in handling small-batch customized orders but also reaffirms our strengths in quality control, delivery speed, and customer service.
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ASTM A182 F316L Socket Weld Flange Introduction
ASTM A182 F316L Socket Weld Flange is a high-performance flange forged from austenitic stainless steel 316L material. Containing low carbon (≤0.03%), 316L stainless steel maintains excellent corrosion resistance while effectively preventing intergranular corrosion, making it highly suitable for welding applications.
Socket weld flanges are typically used for connecting small-diameter, high-pressure pipelines. Their structural feature involves an internal socket into which the pipe end is inserted for welding. The weld seam is positioned along the outer circumference of the flange, ensuring high connection strength and sealing integrity.
Dimension Inspection
Outer Diameter (OD)
Measure the overall outer diameter of the flange using a vernier caliper/OD caliper to ensure it conforms to standards, facilitating proper connection with piping systems and bolted joints.
Inner Diameter (ID)
Measure the inner bore diameter of the flange with a vernier caliper to guarantee compatibility with the connected pipe’s outer diameter, preventing improper installation.
Thickness (T)
Measure the flange thickness using a vernier caliper or micrometer to confirm the flange’s pressure-bearing capacity meets requirements and ensures safety.
Bolt Holes
Verify the number matches the standard to ensure proper bolt installation and guarantee stable flange connection.
Sealing Surface (Raised Face / RF)
Diameter: Measure the diameter of the sealing surface to ensure sealing effectiveness and prevent leakage.
Specification of Forged Socket Weld Flanges
| Size Range | 1/2″- 3″ / DN15 – DN80 |
| Pressure Rating | Class 150, 300, 600, 1500 |
| Standard | ANSI / ASME B16.5 |
| Carbon Steel | ASTM A105 / A105N |
| Low Temp Carbon Steel | ASTM A350 LF2 / LF3 |
| Pipeline Steel | ASTM A694 F42 / 46 / 56 / 60 / 65 |
| Alloy Steel | ASTM A182 F11 / 12 / 12 / 5 / 9 / 91 / 92 |
| Stainless Steel | ASTM A182 F304 / 304L / 304H, 316 / 316L, 310S, 317, 347, 904L |
| Duplex Stainless Steel | ASTM A182 F51, F53, F44 |
ASTM A182 F316L Forged Flange Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| ASTM A182 F316 | MIN | 10.0 | 16.0 | 2.00 | ||||||
| MAX | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 14.0 | 18.0 | 3.00 | 0.10 | |
| ASTM A182 F316L | MIN | 10.00 | 16.0 | 2.00 | ||||||
| MAX | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 15.00 | 18.0 | 3.00 | 0.10 |
ASTM A182 F316L Forged Flange Mechanical Property
| MATERIAL | T.S (MPA) | Y.S (MPA) | EL % | R/A % |
| ASTM A182 F316 | 515 min | 205 min | 30 min | 50 min |
| ASTM A182 F316L | 485 min | 170 min | 30 min | 50 min |
Class 300lb Socket Weld Flange Dimensions & Weight
| Nominal Pipe Size | A | B | C | D | E | K | F | G | H | I | J | Weight | |
| inch | mm | mm | mm | mm | mm | mm | mm | mm | mm | Holes | mm | mm | kg / piece |
| 1/2 | 21.30 | 95.20 | 15.70 | 14.20 | 22.30 | 22.40 | 9.60 | 38.10 | 35.10 | 4 | 15.70 | 66.55 | 0.66 |
| 3/4 | 26.70 | 117.3 | 20.80 | 15.70 | 25.40 | 27.70 | 11.10 | 47.70 | 42.90 | 4 | 19.10 | 82.50 | 1.15 |
| 1 | 33.40 | 123.9 | 26.70 | 17.50 | 26.90 | 34.50 | 12.70 | 53.80 | 50.80 | 4 | 19.10 | 88.90 | 1.40 |
| 11/4 | 42.20 | 133.3 | 35.10 | 19.00 | 26.90 | 43.20 | 14.20 | 63.50 | 63.50 | 4 | 19.10 | 98.60 | 1.75 |
| 11/2 | 48.30 | 155.4 | 40.90 | 20.60 | 30.20 | 49.50 | 15.70 | 69.85 | 73.15 | 4 | 22.30 | 114.3 | 2.55 |
| 2 | 60.30 | 165.1 | 52.60 | 22.30 | 33.20 | 62.00 | 17.50 | 84.00 | 91.90 | 8 | 19.10 | 127.0 | 2.93 |
| 21/2 | 73.00 | 190.5 | 62.70 | 25.40 | 38.10 | 74.70 | 19.00 | 100.0 | 104.6 | 8 | 22.30 | 149.3 | 4.40 |
| 3 | 88.90 | 209.5 | 78.00 | 28.40 | 42.90 | 90.70 | 20.60 | 117.3 | 127.0 | 8 | 22.30 | 168. 1 | 5.92 |
Performance Characteristics
Excellent Corrosion Resistance
– Contains 2-3% molybdenum, providing strong resistance to chloride pitting and crevice corrosion.
– Exhibits excellent corrosion resistance in chemical media, seawater environments, and acidic and alkaline media.
Excellent Weldability
– Low-carbon design avoids carbide precipitation in the heat-affected zone (HAZ), eliminating the need for additional post-weld heat treatment.
– Suitable for high-purity applications and industries with stringent welding requirements.
Reliable Pressure Capacity
– Dense forged structure, free of pinholes and cracks.
– Highly precise flange thickness, socket depth, and sealing surface machining ensure the stability of high-pressure systems.
Uses of Socket Weld Flanges
High-Pressure Piping Systems
Small-Diameter Piping (≤ 2 inches)
Steam, Oil, Gas, and Water Lines
Chemical Processing Plants
Power Plants
Petrochemical and Oil Refineries
Shipbuilding and Marine Applications
Food & Beverage and Pharmaceutical Plants (occasionally)