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Alloy Steel F91 Flanges

Alloy Steel F91 Flanges are critical components in various industrial applications, known for their exceptional strength, heat resistance, and corrosion resistance. These flanges are made from alloy steel F91, which is a high-strength, low-alloy steel that contains chromium and molybdenum as primary alloying elements. This alloy is widely recognized for its outstanding properties in high-temperature and high-pressure environments, making it an ideal choice for applications in industries such as petrochemical, power generation, and more.

Table Of Content

Manufacturing Process Of Alloy Steel F91 Flanges
Specification Of Alloy Steel F91 Flanges
Alloy Steel F91 Flanges Equivalent Grades
Chemical Composition of Alloy Steel F91 Flanges
Mechanical Properties of Chrome Moly F91 Flanges
Types Of Alloy Steel F91 Pipe Flanges
Other Types Of Alloy Steel F91 Flanges
UNS K91560 Flanges Price, Dimension, Weight
Alloy Steel F91 Flanges Industrial Application
Export & Supply Destination of Alloy Steel Gr.F91 Flanges

High Temperature Resistance: One of the most significant advantages of Alloy Steel F91 flanges is their ability to withstand high temperatures. They maintain their mechanical properties at temperatures up to 600°C (1112°F), making them suitable for use in high-temperature processes.

Corrosion Resistance: The presence of chromium in the alloy imparts excellent corrosion resistance, ensuring the flanges remain durable and reliable in aggressive and corrosive environments.

High Strength: Alloy Steel F91 has a high tensile strength, making flanges made from this material capable of withstanding high-pressure conditions in industrial settings.

Creep Resistance: These flanges are designed to resist creep, which is the gradual deformation under constant load at elevated temperatures. This property is crucial in applications involving long-term, high-temperature exposure.

Weldability: Alloy Steel Grade 91 is weldable, allowing for ease of fabrication and installation. Proper welding techniques should be employed to maintain the material's integrity.

Alloy Steel F91 flanges come in various types, such as weld neck, slip-on, socket weld, and blind flanges, to suit different piping and equipment connections. They are available in different sizes, pressure ratings, and facing types to meet specific project requirements.

Applications of Alloy Steel F91 flanges:

Power Generation: These flanges are widely used in power plants for applications like steam turbines, boilers, and high-pressure piping systems.

Petrochemical Industry: They are suitable for handling corrosive fluids and high-temperature processes in refineries and chemical plants.

Oil and Gas: Alloy Steel F91 flanges are used in the construction of pipelines, wellheads, and other equipment in the oil and gas industry.

Aerospace: In certain aerospace applications, these flanges are employed for their exceptional heat resistance and strength.

Manufacturing Process Of Alloy Steel F91 Flanges

Raw Material Selection

The manufacturing process of flanges begins with the careful selection of raw materials.

Cutting and Shaping

Once the raw materials are selected, they undergo a precise cutting and shaping process.

Finishings and Coatings

Coating the materials to a specific temperature ensures they become malleable, facilitating the shaping process.

Welding and Joining

These processes ensure secure and leak-proof connections, enhancing the reliability and longevity.

Finishing and Quality Control

After this the buttweld fittings undergo comprehensive finishing and quality control procedures.

Packaging and Delivery

To reach their destination in pristine condition, we employ careful packaging techniques.

Specification Of Alloy Steel F91 Flanges

Standard	ASTM A181 / ASME SA181
Dimension	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092
Flanges Size	1/2" (15 NB) to 48" (1200NB) DN10~DN5000
Flange Face Type	Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove
Pressure Class	PN 2.5 TO PN 400
Pressure Rating ANSI	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Pressure Calculation in DIN	6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64
Table	D, E, F, H
Types	Forged / Threaded / Screwed / Plate
Form	Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange, Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange.
Flanges Marking	All Flanges are marked as follows: Grade, Standard, Thickness, Heat No. (Or according to the customer’s request.)