Alloy Steel Flanges Manufacturer in India

Alloy steel flanges are widely used in high-pressure and high-temperature industrial piping systems where superior mechanical strength, corrosion resistance, and thermal stability are essential. As a trusted Alloy Steel Flanges Manufacturer in India, CEBEX STEEL INDIA manufactures and exports precision-engineered alloy steel flanges designed for critical applications in refineries, petrochemical plants, thermal power stations, offshore installations, and process industries.

Our alloy steel flanges are manufactured using premium chromium-molybdenum alloy steels and advanced forging technology to ensure outstanding durability, dimensional accuracy, and long service life under severe operating conditions. We supply forged alloy steel flanges in multiple grades including ASTM A182 F5, F9, F11, F22, and F91 with complete compliance to international standards.

Alloy Steel Flanges Manufacturer in India – ASTM A182 F11 F22 F91 Flanges by CEBEX STEEL INDIA

Why Choose Us as Your Alloy Steel Flange Supplier?

CEBEX STEEL INDIA is recognized globally for supplying high-performance alloy steel flanges with strict quality control and technical expertise. We are ISO 9001:2015 certified with PED-approved products for international projects and full compliance with ASTM, ASME, EN, DIN, and BS standards.

Our advanced forging, heat treatment, and CNC machining facilities combined with in-house testing and inspection capabilities ensure every flange meets project-specific technical requirements. We provide complete traceability with EN 10204 3.1 / 3.2 certification for all global export supply to EPC and industrial projects.

Product Overview & Technical Specifications

Our alloy steel flanges are manufactured using premium raw materials with every stage of production closely monitored for quality assurance.

Feature	Specification / Detail
Material Standards	ASTM A182 / ASME SA182
Flange Standards	ASME B16.5, ASME B16.47, EN 1092-1, DIN
Grades	F1, F5, F9, F11, F12, F22, F91
Size Range	½" NB to 48" NB (DN15–DN1200)
Pressure Ratings	Class 150, 300, 600, 900, 1500, 2500
Manufacturing Process	Forged / Heat Treated / Machined
Flange Types	Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint
Surface Finish	Anti-rust coated, machined, shot blasted
Heat Treatment	Annealed / Normalized / Tempered
Documentation	EN 10204 3.1/3.2, NDT Reports, PMI Reports

Equivalent Grades of Alloy Steel Flanges

Alloy steel flange grades are recognized across international standards with equivalent designations.

ASTM / ASME Grade	EN / DIN Equivalent	WNR No.	Common Description
ASTM A182 F5	13CrMo44	1.7362	Chromium-Moly alloy steel
ASTM A182 F9	X12CrMo9-1	1.7386	High-temperature alloy steel
ASTM A182 F11	13CrMo4-5	1.7335	Chrome moly alloy steel
ASTM A182 F22	10CrMo9-10	1.7380	Pressure vessel alloy steel
ASTM A182 F91	X10CrMoVNb9-1	1.4903	High creep strength alloy steel

Types of Alloy Steel Flanges We Manufacture

We manufacture a comprehensive range of alloy steel flanges suitable for high-pressure industrial piping systems. Custom-designed flanges are manufactured according to client drawings and project specifications.

Weld Neck Flanges
Slip-On Flanges
Blind Flanges
Socket Weld Flanges
Threaded Flanges
Lap Joint Flanges
Orifice Flanges
Spectacle Blind Flanges
Long Weld Neck Flanges
Reducing Flanges

Grades, Materials & International Standards

All materials are procured from approved mills and supplied with full traceability documentation.

Alloy Steel Grade	Typical Applications	Standards
ASTM A182 F5	Refineries, high-temperature piping	ASTM A182
ASTM A182 F9	Thermal power plants	ASTM A182
ASTM A182 F11	Petrochemical process piping	ASTM A182
ASTM A182 F22	Pressure vessels, boilers	ASTM A182
ASTM A182 F91	Superheater and reheater systems	ASTM A182

Chemical Composition of Alloy Steel Flanges

Alloy steel flanges are supplied with controlled chemical compositions for consistent high-temperature performance.

ASTM A182 F11

Element	Composition (%)
Carbon (C)	0.05 – 0.15
Chromium (Cr)	1.00 – 1.50
Molybdenum (Mo)	0.44 – 0.65
Manganese (Mn)	0.30 – 0.60
Silicon (Si)	0.50 – 1.00

ASTM A182 F22

Element	Composition (%)
Carbon (C)	0.05 – 0.15
Chromium (Cr)	2.00 – 2.50
Molybdenum (Mo)	0.87 – 1.13
Manganese (Mn)	0.30 – 0.60

ASTM A182 F91

Element	Composition (%)
Chromium (Cr)	8.00 – 9.50
Molybdenum (Mo)	0.85 – 1.05
Vanadium (V)	0.18 – 0.25
Carbon (C)	0.08 – 0.12
Nickel (Ni)	0.40 max

Mechanical Properties

Alloy steel flanges offer excellent creep resistance, thermal stability, and high-pressure performance.

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
F5	485 min	275 min	20
F11	415 min	205 min	20
F22	415 min	205 min	20
F91	585 min	415 min	20

Dimensions, Sizes & Weight Chart

Manufactured according to ASME B16.5 / B16.47 standards. Custom dimensions and special machining available upon request.

Size (NB)	OD (mm)	Thickness (mm)	Bolt Circle (mm)	Number of Bolts
½"	89	11.2	60.3	4
1"	114	13.5	79.4	4
2"	152	17.5	120.7	8
4"	229	24.3	190.5	8
8"	343	30.2	298.5	8

Applications & Industries Served

Our alloy steel flanges are widely used across industries. Their superior heat resistance and mechanical strength make them ideal for critical industrial applications.

Oil & Gas Refineries
Thermal Power Plants
Petrochemical Industries
Boiler & Pressure Vessel Manufacturing
Offshore Platforms
Chemical Processing Plants
High-Temperature Steam Lines
Heat Exchanger Systems

Testing & Quality Assurance

All alloy steel flanges undergo PMI, Ultrasonic Testing (UT), Radiographic Testing (RT), Hydrostatic Testing, Tensile & Hardness Testing, and Dimensional Inspection.

Complete inspection reports are supplied with every shipment including EN 10204 3.1/3.2 certification.

Packing, Delivery & Export Capabilities

We ensure safe export packaging with export-grade wooden boxes / pallets, anti-corrosion oil coating, custom marking and labeling, and complete export documentation.

We export alloy steel flanges to Africa, Middle East, Europe, Southeast Asia, and global industrial markets.

Exporting Alloy Steel Flanges to Africa

As a leading Alloy Steel Flanges Manufacturer in India, we have supplied high-performance flanges to major industrial and infrastructure projects across Africa including Nigeria, Egypt, Kenya, South Africa, and Ethiopia. Our export team ensures smooth logistics, technical compliance, and timely delivery for EPC contractors and industrial buyers. To learn more about our specialized solutions for the continent, visit our Africa Alloy Steel Flanges Exporter page.

Related Alloy Flanges – Stainless Steel, Duplex, Super Duplex, Inconel, Hastelloy, Monel, Titanium, Copper Nickel, Carbon Steel

In addition to Alloy Steel Flanges, we also manufacture and export Stainless Steel Flanges, Duplex Flanges, Super Duplex Flanges, Inconel Flanges, Hastelloy Flanges, and Monel Flanges. These engineered alloy flanges are designed for demanding industrial environments requiring high strength, corrosion resistance, and long-term reliability.

Our technical team ensures precise material selection and full compliance with international standards to meet your project requirements.

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Why Choose CEBEX STEEL INDIA?

Our clients trust CEBEX STEEL INDIA for technical expertise, quality assurance, competitive pricing, and dependable global supply. We provide engineering support, material selection guidance, and project-specific manufacturing solutions for critical industrial applications.

Frequently Asked Questions (FAQ)

What are alloy steel flanges used for?

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Alloy steel flanges are used in high-temperature and high-pressure piping systems in power plants, refineries, and petrochemical industries.

Which alloy steel flange grades do you supply?

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We supply ASTM A182 F1, F5, F9, F11, F22, and F91 grades.

Are alloy steel flanges suitable for high-temperature service?

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Yes, chromium-moly alloy steel flanges provide excellent thermal stability and creep resistance.

Which standards are followed for alloy steel flanges?

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ASTM A182, ASME B16.5, ASME B16.47, EN, DIN standards.

Do you provide mill test certificates?

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Yes, all flanges are supplied with EN 10204 3.1 / 3.2 test certificates.

What is your standard delivery time?

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Standard delivery is typically 2–4 weeks depending on size and quantity.