Slip-On
Flanges Manufacturer
At Steel Icon Stainless Pvt. Ltd., we manufacture and export high-quality stainless steel slip-on flanges that offer quick installation, reliable sealing, and cost-efficiency in various low-pressure and non-critical piping systems.
Manufactured to international standards such as ASTM, ASME, ANSI, DIN, and EN, our slip-on flanges are widely used in water supply, HVAC, low-pressure steam lines, fire-fighting systems, and general industrial pipelines.
What is a Slip-On Flange?
A slip-on flange is a ring-shaped component that is slipped over the pipe and then fillet welded on both the inner and outer sides for added strength. Unlike weld neck flanges, it does not require a long hub or precise pipe alignment, making it simpler and faster to install. Slip-on flanges are ideal for low-pressure, low-temperature applications where ease of installation and maintenance is a priority.
| Products |
|---|
|
Stainless Steel Bar |
|
Fasteners |
|
Forged Products |
|
Flanges |
|
Forged Fittings |
|
Stainless Steel Billets |
|
Round Corner Square Billets |
|
Stainless Steel Pipes |
|
Pipe Fittings |
|
Valve |
Slip-On Flanges Specifications
| Property | Specification |
|---|---|
|
Material Grades |
SS 304, SS 316, SS 321, SS 347, SS 410, Duplex 2205 |
|
Sizes |
½” to 48” (DN 15 to DN 1200) |
|
Pressure Ratings |
Class 150, 300, 600 |
|
Face Types |
RF (Raised Face), FF (Flat Face) |
|
Standard Compliance |
ASTM A182, ASME B16.5, EN 1092-1, DIN 2576 |
|
Manufacturing Process |
Forged / Machined / Heat Treated |
|
Finish |
Machined, Pickled, Passivated, Anti-Rust Coated |
Stainless Steel Grades & Equivalent Standards
| Grade | UNS | EN / WNR |
|---|---|---|
|
SS 304 |
S30400 |
1.4301 / X5CrNi18-10 |
|
SS 316 |
S31600 |
1.4401 / X5CrNiMo17-12-2 |
|
SS 321 |
S32100 |
1.4541 / X6CrNiTi18-10 |
|
SS 410 |
S41000 |
1.4006 / X12Cr13 |
|
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 |
|
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 600 |
Applications of Slip-On Flanges
Weld neck flanges are critical in high-pressure and high-temperature applications, offering leak-proof, long-term service:
- Oil & Gas Pipelines – Transport of crude, natural gas, and chemicals
- Petrochemical Plants – Process piping, reactors, and separator vessels
- Power Generation – Steam lines, boiler headers, and turbine piping
- Marine & Offshore – Subsea piping, ship engine systems, ballast lines
- Chemical Processing Units – Corrosive fluid transfer and high-stress systems
- Heavy Equipment Fabrication – Pressure vessels, heat exchangers, reactors
Types of Slip-On Flanges
We provide multiple variations of slip-on flanges to meet your piping system requirements:
- Standard Slip-On Flanges – Ideal for use in general-purpose pipelines and low-pressure systems.
- Raised Face Slip-On Flanges – Offers improved gasket compatibility and pressure sealing.
- Flat Face Slip-On Flanges – Used where mating components are flat-faced (e.g., in fiberglass or plastic flanges).
- Orifice Slip-On Flanges – Designed with bores for flow metering devices or measurement access.
Benefits of Slip-On Flanges
- Easy to align and install, saving time on-site
- Require less accurate pipe cutting, making them cost-effective
- Fillet-welded on both sides for moderate mechanical strength
- Suitable for non-critical and lower-pressure systems
- Available in a range of materials, face types, and sizes
- Corrosion and rust-resistant, ideal for long-term service
Frequently Asked Questions
Explore our FAQs for insights on materials, customization, and delivery.
What makes slip-on flanges more economical?
Slip-on flanges require less welding and precision, making them faster and cheaper to install, especially in non-critical systems.
Are slip-on flanges suitable for high-pressure use?
They are generally used in low to medium pressure systems. For high-pressure applications, weld neck flanges are more appropriate.
Do you offer slip-on flanges with special face finishes?
Yes, we supply flanges with raised face (RF), flat face (FF), and custom gasket grooves upon request.
Are these flanges compatible with standard pipes and fittings?
Yes, all our slip-on flanges are dimensionally compatible with standard pipe sizes and industrial fittings.
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