ASTM A182 Gr F91 Alloy Steel Flanges Manufacturers & Suppliers in India

ASTM A182 F91 is a specification set by ASTM International for forged or rolled alloy and stainless steel flanges, fittings, valves, and parts used in high-temperature service. Specifically, ASTM A182 F91 is a grade of alloy steel that is designed for elevated temperature service.

Types of ASTM A182 F91 Alloy Steel Flanges:

Weld Neck Flanges (WNRF): These flanges have a long tapered hub and are preferred for high-pressure applications. The neck provides reinforcement to the pipe, reducing stress concentration.
Slip-On Flanges (SORF): These flanges slide over the pipe and are not welded to it. They are easy to align and suitable for low-pressure applications.
Blind Flanges: These flanges are used to close the end of a pipe system. They do not have a bore and are used for pressure testing or to block off a pipe.
Socket Weld Flanges (SWRF): These flanges have a socket that welds to the pipe, providing good strength and flow characteristics.
Threaded Flanges: Similar to socket weld flanges, threaded flanges are used for small-diameter pipes and have threads that match the pipe's threads.
Lap Joint Flanges: These flanges are used with a stub end or with a flanged lap joint backing flange. They are particularly useful in applications where easy dismantling is required.

Table Of Content

What is ASTM A182 Gr F91 Alloy Steel Flanges
ASTM A182 Gr F91 Alloy Steel Flanges Specifications
ASTM A182 Gr F91 Alloy Steel Flanges Chemical Composition
ASTM A182 Gr F91 Alloy Steel Flanges Mechanical Properties
Types Of ASTM A182 Gr F91 Alloy Steel Flanges
Application Industries Of ASTM A182 Gr F91 Alloy Steel Flanges

Features of ASTM A182 F91 Alloy Steel:

High-Temperature Resistance: ASTM A182 F91 alloy steel is designed to withstand high-temperature environments, making it suitable for applications such as power plants, refineries, and petrochemical industries.
Corrosion Resistance: The alloy composition of ASTM A182 F91 provides good corrosion resistance, ensuring durability in harsh conditions.
High Strength: Alloy steel, including F91, is known for its high tensile strength and toughness, making it suitable for demanding applications.

Applications: ASTM A182 F91 Alloy Steel Flanges are commonly used in industries where high-temperature and high-pressure conditions are prevalent. Some specific applications include:

Power Plants: F91 flanges are used in components like steam boilers and turbines.
Petrochemical Industry: They are utilized in various processes, including chemical processing and refining.
Oil and Gas Industry: F91 flanges find applications in pipelines, valves, and other critical components.
Energy Sector: These flanges are used in applications requiring resistance to high-temperature and corrosive environments.

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ASTM A182 Gr F91 Alloy Steel Flanges Specifications

Standard	ASTM A182 / ASME SA182
Dimensions	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
Size	1/2" (15 NB) to 48" (1200NB), DN10~DN5000
Pressure Rating	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
JIS	16 K, 5K, 10 K, 20 K, 30 K, 40 K, 63 K
Flange Connection / 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, Flange Pipe.
Types of Flanges	Threaded / Screwed / Forged / Plate
Coating	Yellow Transparent, Zinc Plated, Anti-rust Paint, Oil Black Paint, Cold and Hot Dip Galvanized
Test Of Flange	Direct-reading Spectrograph, Ultrasonic flaw detector, Magnetic particle detector, X-ray detector, Hydrostatic testing machine.
Production Technique Used	Heat treated, Forged and Machined
Equipment	Press machine, Bending machine, Pushing Machine, Sand-blasting machine, electric bevelling machine etc.
Test Certificates	EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc

ASTM A182 Gr F91 Alloy Steel Flanges Manufacturing Process

Flange Forging

Compared to cast flanges, forged flanges typically contain less carbon and are less likely to corrode. Forgings have superior mechanical qualities, a thicker structure, and a more streamlined shape.

Heat Treatment

The flange is undergoing heat treatment; the forging process has the slowest total cooling pace, while the standardizing and reducing processes have faster cooling speeds. The flange is undergoing heat treatment; the forging process has the slowest total cooling pace, while the standardizing and reducing processes have faster cooling speeds.

Forging Rolling

Roll forging is a forging technique that shapes a metal object by using opposing rolls. Although roll forging employs rolls to accomplish the desired material deformation, it is categorized as a metal forging procedure rather than a rolling procedure.

Rust Prevention

For steel flanges, conventional rust protection treatments include hot dip galvanizing, electro galvanizing (cold), varnish paint coating, black paint coating, black phosphating treatment, yellow (golden) paint coating, etc.

ASTM A182 Gr F91 Alloy Steel Flanges Chemical Composition

Chemical Composition of ASTM A181, Heat Analysis, %
Carbon [C]	≤0.30
Manganese [Mn]	≤1.60
Phosphorus [P]	≤0.025
Sulfur [S]	≤0.025
Silicon [Si]	0.15-0.35

ASTM A182 Gr F91 Alloy Steel Flanges Mechanical Properties

Items	Value
Yield Strength ReH N/mm2	205 min
Tensile Strength Rm N/mm2	415 min
Elongation ( A )	22% min
Reduction ( Z )	35% min
Impact Test ( J )	27 min

ASTM A182 Gr F91 Alloy Steel Flanges Technical Information

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Types Of ASTM A182 Gr F91 Alloy Steel Flanges

ASTM A182 Gr F91 Alloy Steel Slip On Flanges

ASTM A182 Gr F91 Alloy Steel Weld Neck Flange

ASTM A182 Gr F91 Alloy Steel Socket weld Flanges

ASTM A182 Gr F91 Alloy Steel Threaded Flanges

ASTM A182 Gr F91 Alloy Steel Blind Flange

ASTM A182 Gr F91 Alloy Steel Lap Joint Flanges

ASTM A182 Gr F91 Alloy Steel Forged Flanges

ASTM A182 Gr F91 Alloy Steel Spectacle Blind Flange

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