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.
The differences between ASTM A105 and ASTM A105N flanges primarily
revolve around heat treatment, mechanical properties, and
application suitability:
Heat Treatment:
- 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.
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
| Material Grade | ASTM A105 / ASME A105N |
| Standard | ANSI / ASME B16.5 |
| Manufacture Method | Forged |
| Size | 1/2" to 48" |
| Class | 150#, 300#, 400#, 600#, 900#, 1500#, 2500# |
| Surface Treatment | Galvanized/Anti-Corrosion Coating/Black Painting |
| Application | For Pipe Connection |
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
