ANSI 300 Flange Manufacturer
SSM’s ANSI 300 flange offers a versatile range of materials including carbon steel, stainless steel, and alloy steel, catering to diverse usage environments and process requirements.
What is a class 300 flange?
ANSI 300 flanges adhere to the ANSI (American National Standards Institute) standard, with a pressure rating of 300 pounds (Class 300). Class 300 indicates that the flange can endure a pressure of approximately 740 pounds per square inch (psi) at room temperature. This type of flange is frequently employed in industrial settings that call for moderate pressure and temperature, such as high-pressure steam pipelines, oil pipelines, and chemical processing pipelines.
Common Types of ANSI Class 300 Flanges
- Weld Neck Flange: This type is used in high-pressure systems. It has a protruding neck and an end face welded to the pipe.
- Slip-On Flange: With this type, the pipe is inserted into the flange and then welded, making it convenient for installation.
- Blind Flange: This type is used to block the end of the pipe without any holes.
- Threaded Flange: This type allows for internal thread and external thread pipe connection without requiring any welding.
- Socket Weld Flange: With this type, the pipe is inserted into the socket of the flange and then welded. It is suitable for small-diameter high-pressure pipes.
ASME B16.5 Dimensions of Class 300 Flanges
We offer the flange types mentioned above in various sizes. You can refer to the PDF file for details on the ansi 300 flange specifications :
ANSI 300 Flange Materials
SSM offers Class 300 flanges in a variety of materials suitable for different industrial and commercial applications. Carbon steel flanges are commonly used for general industrial purposes, while stainless steel flanges are ideal for corrosive and hygienic environments due to their excellent corrosion resistance and high-temperature performance. Nickel alloy flanges are suitable for extreme temperature, pressure, and corrosive environments. Choosing flanges made of the appropriate materials for specific application requirements is crucial to ensuring the safety and reliability of the system.
The common materials we provide include:
- Carbon steel Class 150 flanges: ASTM A105, ASTM A350 LF2
- Stainless steel Class 150 flanges: ASTM A182 F304/F304L, ASTM A182 F316/F316L
- Nickel alloy Class 150 flanges: Inconel (such as Inconel 600, 625), Monel (such as Monel 400), Hastelloy (such as Hastelloy C276)
One-Stop Flange Provider for All Your Needs
SSM has significant product advantages in manufacturing ansi 300 flanges. Whether it’s quality or price, we will meet your needs.
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Additional information on ANSI 300 Flange
“ANSI Class” ratings provide a standardized method for selecting the correct flange for piping systems, ensuring safety and reliability under specified temperature and pressure conditions.
“ANSI Class” (also called “pressure class” or “pressure level”) is a numerical value representing the maximum working pressure of a flange at a specific temperature. These ratings are standardized by ANSI (American National Standards Institute) and adopted and published by ASME (American Society of Mechanical Engineers). For example, the American National Standard is ASME B16.5-2020: Pipe Flanges and Flange Fittings, a document developed by the American Society of Mechanical Engineers (ASME) that covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods for specifying openings for pipe flanges and flange fittings.
Standard ANSI Class ratings include:
– Class 150
– Class 300
– Class 400
– Class 600
– Class 900
– Class 1500
– Class 2500
Each Class rating represents the maximum working pressure that a flange can withstand at different temperatures. As the temperature increases, the pressure that the flange can withstand decreases.
| Temperature (°F) | Class 150 (psi) | Class 300 (psi) | Class 600 (psi) | Class 900 (psi) | Class 1500 (psi) | Class 2500 (psi) |
| -20 to 100 | 285 | 740 | 1480 | 2220 | 3705 | 6170 |
| 200 | 260 | 680 | 1360 | 2040 | 3400 | 5665 |
| 400 | 230 | 655 | 1310 | 1965 | 3270 | 5450 |
| 600 | 195 | 635 | 1270 | 1905 | 3170 | 5280 |
| 800 | 170 | 600 | 1200 | 1800 | 3000 | 5000 |
Working Pressure and Temperature Range of Class 300 Flanges with Different Materials
The pressure rating of the flange is influenced by the material used. Different materials have varying maximum working pressures at the same temperature. For instance, carbon steel and stainless steel behave differently at elevated temperatures.
| Material | Typical Temperature Range (°C) | Maximum Working Pressure (psi) |
| Carbon Steel | -29°C to 38°C | 740 psi |
| Stainless Steel | -196°C to 600°C | 720 psi |
| Nickel Alloys | -200°C to 800°C | 740 psi |