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Published:2025-11-20 | Last Updated: 2025-11-20 Views: 67
ASTM A105 steel flanges are carbon steel forged flanges primarily used for pipeline connections, valves, and equipment interfaces. They comply with the requirements of the American ASTM A105 standard. These flanges feature high strength, excellent weldability, and pressure resistance, making them suitable for high-temperature, high-pressure pipeline systems.
| Parameter | Description |
|---|---|
| Standard | ASTM A105 / ASME B16.5 |
| Material | Forged carbon steel |
| Flange Type | Weld Neck (WN), Slip On (SO), Blind (BL), Socket Weld (SW), Threaded (TH) |
| Outer Diameter (OD) | 50 mm ~ 1400 mm (customizable) |
| Inner Diameter (ID) | Customized according to pipeline nominal size |
| Wall Thickness (WT) | 6 mm ~ 60 mm |
| Bolt Holes | Arranged according to standards; quantity and diameter vary with size and pressure rating |
| Pressure Rating | Class 150, Class 300, Class 600, Class 900, Class 1500, Class 2500 |
| Applicable Temperature | -29°C ~ 425°C (suitable for high-temperature pipeline systems) |
| Mechanical Properties | Yield Strength ≥ 205 MPa, Tensile Strength 415–620 MPa (as per standard) |
| Typical Applications | Oil, natural gas, chemical industry, water supply and drainage, and high-temperature & high-pressure piping systems |
| Surface Treatment | Anti-rust oil, anti-corrosion coating, sandblasting, or hot-dip galvanizing (optional) |
| Nominal Pipe Size (NPS) | Outer Diameter (OD, mm) | Number of Bolt Holes | Bolt Hole Diameter (mm) | Flange Thickness (THK, mm) |
|---|---|---|---|---|
| 1/2" | 95 | 4 | 18 | 16 |
| 3/4" | 105 | 4 | 18 | 16 |
| 1" | 120 | 4 | 18 | 16 |
| 1 1/4" | 140 | 4 | 18 | 18 |
| 1 1/2" | 155 | 4 | 18 | 19 |
| 2" | 170 | 4 | 18 | 19 |
| 2 1/2" | 195 | 4 | 18 | 22 |
| 3" | 210 | 4 | 18 | 22 |
| 4" | 240 | 8 | 18 | 22 |
| 5" | 270 | 8 | 18 | 25 |
| 6" | 300 | 8 | 18 | 25 |
| 8" | 360 | 8 | 23 | 28 |
| 10" | 425 | 12 | 23 | 31 |
| 12" | 485 | 12 | 23 | 34 |
| 14" | 540 | 12 | 26 | 36 |
| 16" | 600 | 16 | 26 | 38 |
| 18" | 670 | 16 | 26 | 41 |
| 20" | 730 | 16 | 26 | 44 |
| 24" | 840 | 20 | 29 | 50 |
Note:
The table lists common dimensions for Class 150 flanges. Outer diameters and thicknesses increase for other pressure ratings (Class 300, 600, etc.).
Bolt hole diameters and quantities are designed per standards to ensure sealing integrity and installation reliability.
Non-standard dimensions and corrosion protection treatments can be customized per project requirements.
Class 150: Suitable for low-pressure applications, such as building ventilation systems and low-pressure steam pipelines.
Class 300, 400, 600, 900: Suitable for medium-pressure requirements, such as petrochemical pipelines and medium-pressure boiler piping.
Class 1500, 2500: Suitable for high-pressure applications, such as natural gas transmission pipelines and high-pressure reactors.
Series A: Class 150, 300, 400, 600, 900 (General purpose, larger sizes).
Series B: Class 75, 150, 300, 400, 600, 900 (Compact design, suitable for space-constrained applications).
Technical Parameter Comparison Across Pressure Ratings
| Pressure Rating | Design Pressure (MPa) | Applicable Temperature Range (°C) | Typical Applications |
|---|---|---|---|
| Class 150 | 2.0 | -29 ~ 38 | Building ventilation, low-pressure steam systems |
| Class 300 | 5.0 | -29 ~ 54 | Petrochemical pipelines, medium-pressure boilers |
| Class 600 | 10.0 | -29 ~ 100 | High-pressure natural gas pipelines, reactors |
| Class 900 | 15.0 | -29 ~ 150 | Ultra-high-pressure equipment, subsea pipelines |
| Class 1500 | 25.0 | -29 ~ 200 | Special high-pressure conditions (e.g., nuclear power systems) |
| Class 2500 | 42.0 | -29 ~ 250 | Extreme high-pressure environments (e.g., rocket launch platforms) |
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