ASME B16.5 ASTM A105 / A105N Carbon Steel Blind Flange Forged BLRF Flange

Product Specification

ANSI / ASME B16.5 ASTM A105 Carbon Steel Blind Flange Forged Flange

ASTM A105 is a standard specification covering forged carbon steel piping components for ambient- and higher-temperature service in pressure systems. A105 flanges are commonly used in high-pressure and high-temperature applications. They are available in various types such as weld neck, slip-on, socket weld, threaded, blind, and lap joint flanges. Blind flanges are used to close the ends of piping systems or vessels, and they have no opening for a pipe to pass through. They are commonly used to cap off the ends of pipes to prevent the flow of fluid or gas. Blind flanges are also used for pressure testing a pipeline or vessel by blocking off the end before applying pressure.

• ASTM A105: Used in the as-forged condition, meaning no additional heat treatment beyond forging.
• ASTM A105N: Requires normalization (heating to a specific temperature followed by air cooling), refining the microstructure for improved mechanical properties.

• A105N typically exhibits enhanced toughness, strength, and ductility due to normalization. It may have higher yield/tensile strength and better elongation compared to A105.
• A105N often requires Charpy V-notch impact testing to ensure adequate toughness, especially for low-temperature or cyclic-loading applications. A105 does not mandate such testing.

ASTM A105 Carbon Steel Blind Flange

Flanges Grades

Stainless Steel Flange: F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F317L, F347, F347H, F904L etc

Duplex Steel Flange: UNS S31803, 2205, S31254 (254SMO)

Super Duplex Steel Flange: UNS S32750, UNS S32760, UNS S32304, S31500

Carbon Steel Flange: ASTM A105, A105N etc.

Alloy Steel Flange: F1, F11, F22, F5, F9, F91 etc.

Nickel Alloy Flange as below

Monel 400 & K500,

Inconel 600, 601, 617, 625, 690, 718, X-750.

Incolloy 800, 800H, 800HT, 825, 925.

Hastelloy C22, C4, C276, S, C2000, G-30, G-35, X, N, B, B-2, B-3.

Various Kinds of Flanges we can supply as below:

1. Slip-on Flanges.

Slip-on Flanges have a lower initial cost than welding neck flanges because they require less accuracy in cutting pipe to length, and they provide a greater ease of alignment in assembly. However, their calculated strength under internal pressure is approximately 2/3's the strength of welding neck flanges, and their life under fatigue is 1/3 shorter. Slip-on Flanges are limited to 1/2" to 2½" sizes in 1500lbs standard.

2. Threaded Flanges

Threaded Flanges are used for special applications. They can be assembled without welding and can be used in extremely high pressure services--at or near atmospheric pressure--where alloy steel is essential for strength. Threaded flanges are not suited for conditions involving temperature or bending stresses, or under cyclic conditions where leakage through the threads may occur.

3. Weld Neck Flanges

Weld Neck Flanges have a long tapered hub and gradual transition of thickness in the region of the butt weld joining them to the pipe. The tapered hub provides important reinforcement to the flange and resistance to dishing. This type of flange is preferred for severe service conditions resulting from high pressure, sub-zero or high temperatures.

4. Blind Flanges

Blind Flanges are used to blank off the ends of piping, valves and pressure vessel openings. Blind Flanges can handle high stress from internal pressure and bolt loading since the maximum stresses in the blind flange are bending stresses at the center.

5. Socket Weld Flanges

Socket Weld Flanges were developed for use on small size high pressure piping. With an internal weld, socket weld flanges are stronger and have greater fatigue strength than double welding a slip-on flange. Smooth bore conditions can be easily attained by grinding the internal weld. This flange is commonly used in chemical process piping.

6. Lap Joint Flanges

Lap Joint Flanges are used with lap joint stubs. Lap joint flanges are commonly used in carbon or low alloy steel piping systems that need to be frequently dismantled for inspection and cleaning. They should not be used at any points where severe bending stresses occur.

Applications

• Pipeline systems for transporting oil, gas, and other fluids
• Refinery and chemical processing equipment
• Heat exchangers and boilers
• Power generation equipment
• Offshore drilling rigs and platforms