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Alloy Steel Flanges Manufacturer in India | ASTM A182 F5, F9, F11, F22, F91 Flanges Supplier

Alloy Steel Flanges Manufacturer | Supplier of ASTM A182 F5, F9, F11, F22, F91

STAINLESS INDIA stands as a prominent manufacturer, stockist, and exporter of Alloy Steel Flanges, providing high-quality industrial flanges designed for high-temperature, high-pressure, and corrosive environments. Our Alloy Steel Flanges are produced in accordance with ASTM A182, ASME B16.5, B16.47, BS, DIN, and EN standards, guaranteeing outstanding durability, mechanical strength, and thermal stability. We offer flanges in grades F5, F9, F11, F22, F91, and various other chrome-moly specifications.
We provide a diverse selection of flanges including Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Long Weld Neck, Orifice, and Custom CNC-Machined Flanges across a broad spectrum of alloy steel grades.
These flanges find extensive application in the power generation, oil & gas, petrochemical, and refinery sectors worldwide.

Product Range

Types of Alloy Steel Flanges We Manufacture

Weld Neck (WN)

Designed for extremely high-pressure and high-temperature applications.

Slip-On (SORF)

Facilitates easy installation for low to medium pressure pipelines.

Blind Flanges (BLRF)

Employed to seal off pipeline and pressure vessel openings.

Socket Weld (SWRF)

Optimal for small-diameter, high-pressure piping systems.

Threaded (Screwed)

Utilized without welding, appropriate for flammable pipelines.

Lap Joint Flanges

Compatible with stub ends, perfect for pipelines requiring precise alignment.

Long Weld Neck

Favored for nozzles on high-pressure vessels.

Orifice Flanges

Designed for measuring flow within pipelines.

Custom CNC-Machined

Manufactured according to customer drawings or specifications.

Technical Data

Specifications & Grades

Dimensions & Pressure

Size Range: 1/2" to 48" NB
Pressure Rating: Class 150, 300, 600, 900, 1500, 2500
Standard: ASTM A182 / ASME SA182 / ANSI / EN / DIN / BS
Form: Forged / CNC Machined / Heat-treated

Face Types & Certs

Face Type: RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint)
Testing: IBR, NACE MR0175, ISO 9001
Certification: EN 10204 3.1 / 3.2

Available Alloy Steel Grades

ASTM A182 F1 F5 / F5 CL.2 F9 F11 F12 F22 F91 / F92 Chrome Moly Grades

* IBR, NACE, and PED compliant grades available

Technical Superiority

Key Features of Alloy Steel Flanges

Precision Forged

Precision-forged and CNC-machined to stringent tolerances.

High Temp Resistance

Outstanding creep resistance and stability at elevated temperatures.

Durability

Resistant to oxidation, carburization, and thermal fatigue.

Fully Tested

100% Radiography, Ultrasonic, and PMI tested.

Heat Treated

Heat-treated to enhance mechanical properties and hardness.

Versatile Facing

Available in RTJ (Ring Type Joint), RF (Raised Face), and FF (Flat Face).

Applications

Power Plants (Thermal, Nuclear)

Oil & Gas Pipelines

Petrochemical & Chemical Processing

Marine & Offshore Piping

Boilers & Pressure Vessels

Heat Exchangers & Process Equip.

High-Temp, High-Pressure Systems

Documents Provided

Mill Test Certificate (EN 10204 3.1 / 3.2)
IBR Approval (if applicable)
NACE MR0175 Compliance Certificate
Third-Party Inspection Reports (TUV, SGS, DNV, BV)
Dimensional Reports & Heat Treatment Charts
Packing List, Invoice & Origin Certificate

Our Advantage

Why Choose STAINLESS INDIA for Alloy Steel Flanges?

Fully Certified

ISO, IBR, PED, and CE certified in-house manufacturing and quality control.

Bespoke Machining

CNC machining and bespoke manufacturing services available.

Comprehensive Testing

Quality testing includes UT, RT, PMI, and hardness assessments.

Full Traceability

Complete material traceability accompanied by detailed test reports.

Trusted Supplier

Supplying to EPC contractors, refineries, and power projects globally.

Stock & Delivery

Extensive inventory with prompt delivery and flexible MOQs.

Frequently Asked Questions – Alloy Steel Flanges

Weld Neck Flanges (WNRF) are designed for high-pressure systems featuring buttweld connections, whereas Slip-On Flanges (SORF) are simpler to install but are not as robust under pressure.

Indeed, our ASTM A182 F22 and F91 flanges are extensively utilized in boiler and steam pipeline applications.

Certainly, we provide TPI (SGS, BV, DNV, etc.) and IBR-certified flanges upon request.

Items in stock are dispatched within 2–5 working days. Custom production orders typically require 7–15 days.

Type of Alloy Steel Flanges Available

ASTM A182 F11 flange supplier	ASTM A182 F11 flange supplier	A182 F22 weld neck flange exporter
alloy steel slip on flanges stockist	F5/F9/F91 forged flanges distributor	chrome moly flanges manufacturer
high-pressure alloy flanges exporter	IBR approved flanges supplier	alloy steel flange class 150 to 2500
power plant piping flanges	alloy steel flanges india	alloy steel blind flange stockist
asme b16.5 alloy flanges	chromoly steel flanges manufacturer	alloy steel flanges manufacturer

Global Export Network

We export to more than 70+ countries:

USA • UK • Germany • Italy • UAE • Saudi Arabia • Qatar • Oman • Kuwait • Singapore • Malaysia • Indonesia • Australia • South Africa • Brazil • Mexico • India

All Shipments Include:

Packing List
Invoice
MTC 3.1 / 3.2
Third-Party Inspection (TUV/LR/BV) if required
Heat Number Traceability

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