Blind Flanges Manufacturer
At Steel Icon Stainless Pvt. Ltd., we are a leading manufacturer and exporter of high-quality stainless steel blind flanges, engineered to seal off piping systems and pressure vessels in a safe, reliable, and leak-proof manner.
Manufactured to meet ASTM, ASME, DIN, EN, and ANSI standards, our blind flanges are widely used in oil & gas, power generation, water treatment, chemical processing, and industrial piping systems to terminate flow and allow access for inspection or maintenance.
What is a Blind Flange?
A blind flange is a solid, circular plate with no bore (hole) in the center. It is used to seal the end of a piping system or a vessel nozzle, preventing fluid flow while maintaining system pressure. Blind flanges are typically bolted and gasketed into place and are essential for systems requiring periodic maintenance, testing, or expansion.
| Products |
|---|
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Stainless Steel Bar |
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Fasteners |
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Forged Products |
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Flanges |
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Forged Fittings |
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Stainless Steel Billets |
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Round Corner Square Billets |
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Stainless Steel Pipes |
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Pipe Fittings |
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Valve |
Blind Flanges Specifications
| Property | Specification |
|---|---|
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Material Grades |
SS 304, SS 316, SS 321, SS 347, SS 410, Duplex 2205 |
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Sizes |
½” to 48” (DN 15 to DN 1200) |
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Pressure Ratings |
Class 150, 300, 600, 900, 1500, 2500
|
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Face Types |
RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) |
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Standard Compliance |
ASTM A182 / A240, ASME B16.5, B16.47, EN 1092-1, DIN 2527 |
|
Finish Options |
Machined, Shot Blasted, Passivated, Zinc-Coated |
Stainless Steel Grades & Equivalent Standards
| Grade | UNS | EN / WNR |
|---|---|---|
|
SS 304 |
S30400 |
1.4301 / X5CrNi18-10 |
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SS 316 |
S31600 |
1.4401 / X5CrNiMo17-12-2 |
|
SS 321 |
S32100 |
1.4541 / X6CrNiTi18-10 |
|
SS 410 |
S41000 |
1.4006 / X12Cr13 |
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Duplex 2205
|
S31803 / S32205 |
1.4462 |
Chemical Composition (Typical – SS 304 / SS 316)
| Element | SS 304 (%) | SS 316 (%) |
|---|---|---|
|
Carbon (C) |
0.08 max |
0.08 max |
|
Manganese (Mn) |
2.00 max |
2.00 max |
|
Silicon (Si) |
1.00 max |
1.00 max |
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Chromium (Cr) |
18.0 – 20.0 |
16.0 – 18.0 |
|
Nickel (Ni) |
8.0 – 10.5 |
10.0 – 14.0 |
|
Molybdenum (Mo) |
— |
2.00 – 3.00 |
Mechanical Properties
| Property | SS 304 / SS 316 |
|---|---|
|
Tensile Strength |
515 – 750 MPa |
|
Yield Strength |
205 – 310 MPa |
|
Elongation (%) |
≥ 40% |
|
Hardness (HRB) |
≤ 95 |
|
Working Temp Range |
-200°C to 870°C |
|
Pressure Handling |
Up to Class 2500 |
Applications of Blind Flanges
Blind flanges play a key role in fluid isolation, system shut-off, and equipment protection, and are widely used in:
- Oil & Gas Plants: Line terminations, pressure testing, and nozzle closures
- Petrochemical & Chemical Industry: Corrosive and pressurized process lines
- Marine & Shipbuilding: Sealing systems in ballast lines and fuel storage
- Power Generation: High-pressure steam and feedwater systems
- Water Treatment: Isolation of pipe sections for maintenance or upgrades
- Pharmaceutical & Food Plants: Equipment sealing and hygienic closures
Types of Blind Flanges
We manufacture and supply multiple variants of blind flanges to suit system pressure, gasket sealing, and industry-specific needs:
- Raised Face Blind Flanges – Standard for high-sealing and pressure applications
- Flat Face Blind Flanges – For low-pressure systems where the mating flange is also flat
- RTJ (Ring Type Joint) Blind Flanges – For high-pressure and high-temperature sealing with metallic ring gaskets
- Tapped Blind Flanges – With threaded holes for pressure relief valves, gauges, or test points
- Custom-Machined Blind Flanges – Designed as per client drawings and project specifications
Frequently Asked Questions
Explore our FAQs for insights on materials, customization, and delivery.
When should blind flanges be used?
Blind flanges are used to terminate or isolate piping systems, especially when a permanent or temporary seal is needed for inspection or testing.
Are blind flanges pressure-rated?
Yes. Blind flanges are available in pressure classes ranging from 150 to 2500, suitable for both low and high-pressure environments.
Can blind flanges have threaded holes for pressure relief valves?
Absolutely. We offer tapped blind flanges with threaded bores or test ports as per project needs.
Are they reusable after removal?
Yes, when removed carefully and not damaged, blind flanges can be reused after inspection and reassembly.
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