Flange Manufacturing Process
How Industrial Flanges Are Manufactured
A reliable flange is not made by machining alone. The manufacturing process involves the right material selection, controlled forming, heat treatment, precision machining, dimensional inspection and final quality checks.
Vandan Alloys manufactures and supplies industrial flanges in a wide range of materials, sizes, pressure classes and configurations for piping, process equipment and industrial applications.
1. Raw Material Selection
The manufacturing process starts with suitable raw material according to the required material grade, flange type, size, pressure class and applicable specification.
Materials can include:
Stainless Steel
Carbon Steel
Alloy Steel
Duplex Stainless Steel
Super Duplex Stainless Steel
Nickel Alloys
Inconel
Incoloy
Monel
Hastelloy
Titanium
Material identification and traceability are maintained according to the applicable requirements.
2. Forging & Forming
For forged flanges, the selected material is heated and formed using a controlled forging process.
Forging helps produce a strong and uniform flange structure suitable for demanding piping and industrial service.
The forging route can vary according to the flange size, material grade, design requirements and applicable standard.
3. Heat Treatment
After forging, heat treatment may be carried out as required by the material specification and applicable standard.
The heat-treatment cycle is selected according to the material and product requirements to achieve the required metallurgical and mechanical properties.
4. Precision Machining
After forging and heat treatment, the flange is machined to achieve the required dimensions.
Machining operations can include:
Outside Diameter Machining
Flange Thickness Machining
Bore Machining
Raised Face Machining
Ring Groove Machining
Bolt Hole Drilling
Counterbore or Special Machining
Thread Machining, where applicable
Modern machining methods help maintain dimensional consistency across the finished flange.
5. Flange Facing
The flange face is machined according to the specified facing requirement.
Depending on the application, flanges may be supplied with:
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) or other specified configurations.
The face finish and geometry are controlled according to the applicable specification or customer requirement.
6. Bolt Hole & PCD Machining
Bolt holes are positioned according to the required bolt circle diameter (PCD), number of holes and hole diameter.
Correct bolt-hole positioning is essential for proper alignment during piping installation.
For standard flanges, dimensions are manufactured according to the applicable standard. Special or non-standard flanges can be produced based on an approved customer drawing.
7. Dimensional Inspection
Before dispatch, finished flanges are checked for important dimensions such as:
Outside Diameter, Thickness, Bore, PCD, Bolt Hole Diameter, Bolt Hole Quantity, Face Diameter, Raised Face Height and overall dimensions.
Inspection requirements can be based on the applicable standard, approved drawing and purchase specification.
8. Material & Quality Documentation
Depending on the order requirement, documentation can include Material Test Certificate (MTC), EN 10204 Type 3.1 documentation, dimensional inspection reports and other agreed quality documents.
Third-party inspection can also be arranged when required by the customer.
9. Marking & Traceability
Finished flanges can be marked with relevant identification such as:
Material Grade, Size, Pressure Class, Standard, Manufacturer Identification, Heat Number and other required markings.
Proper marking supports material traceability from production through delivery.
10. Packing for Domestic & Export Supply
After final inspection, flanges are packed according to their size, weight, quantity and transportation requirements.
For export shipments, suitable protective packing is used to help prevent impact, moisture, contamination and handling damage during transportation.
Flanges Manufactured for Different Requirements
Vandan Alloys supplies flanges in various configurations, including:
Weld Neck Flanges, Blind Flanges, Slip-On Flanges, Socket Weld Flanges, Threaded Flanges, Lap Joint Flanges, Orifice Flanges, Long Weld Neck Flanges, Plate Flanges and RTJ Flanges.
Products can be supplied in different sizes, pressure classes, standards and material grades according to project requirements.
Applicable Flange Standards
Depending on the product and application, flanges can be supplied according to recognized specifications and standards such as:
ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS and BS standards.
The applicable standard is selected according to the customer's specification and flange requirements.
Why Manufacturing Control Matters
Every stage of flange production can influence the final product. Material selection affects performance, forging influences structural integrity, heat treatment affects material properties, while machining determines dimensional accuracy and flange fit-up.
For this reason, a controlled manufacturing and inspection approach is important when supplying flanges for industrial piping and process applications.
Vandan Alloys – Flange Manufacturer & Exporter from India
Vandan Alloys manufactures and supplies industrial flanges for customers in India and international markets.
We support requirements involving standard and special flanges, different materials, pressure classes, sizes and flange configurations.
Our supply approach focuses on material traceability, dimensional accuracy, quality documentation, proper packing and reliable export coordination.
For your next flange requirement, share the size, flange type, material grade, pressure class, standard, quantity and delivery location with our team.
Request a Flange Quotation
For enquiries regarding stainless steel flanges, carbon steel flanges, duplex flanges, super duplex flanges, alloy steel flanges and nickel alloy flanges, contact Vandan Alloys for technical and commercial assistance.
Vandan Alloys
Manufacturer of All Types of Flanges
3/5, Sakar Bhavan, Ground Floor, 6th Khetwadi lane, SVP Road ,Mumbai – 400 004. India
TEL +91 022 6610 9925 Mobile no: 0 9892882255 GSTIN: 27AUMPS2067F1ZB
Email: info@vandanalloys.com ; Web: www.vandanalloys.com
Please visit Our Flanges Division:www.vandanalloys.net
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Flange Manufacturing Process | Flange Manufacturer India
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Learn how industrial flanges are manufactured, from material selection and forging to machining, inspection, marking and export packing. Vandan Alloys supplies flanges from India.
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