Carbon Steel Slip On Flange

QS Flange: Slip On Flange China Manufacturer

Forged carbon steel slip on flange to ASME B16.5, 1/2 to 24 inch, Class 150-2500LB, flat or raised face with black treatment, for water, HVAC and light process duty.

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One-Minute Overview

Carbon steel slip on flange, forged to ASME B16.5, sizes 1/2 to 24 inch.
Flat face and raised face options, Class 150 to 2500LB, black treated.
The flat face spreads gasket pressure evenly instead of concentrating it in a groove.
Below 150 psi with a full face gasket, this is the economical joint.

This carbon steel slip on flange is the general purpose member of the family: forged to ASME B16.5, from 1/2 to 24 inch, in Class 150 to 2500LB, with flat face or raised face options and a black surface treatment. Its flat face is machined to give uniform gasket contact pressure, which is what makes it a practical choice for low pressure work.

Name: Slip On Flange
Type: SO
Size: 1/2"-24"
Pressure: 150LB-2500LB
Material: Carbon Steel (CS)
Flange Face: FF / RF
Standard: ASME B16.5
Process: Forged
Surface Treatment: Black
Usage: Water Systems, Oil and Gas Pipelines

The flat face is doing quiet work here. Sealing on a full machined face gives uniform gasket contact pressure and avoids the stress concentration that recessed or tongue and groove designs can produce, which is why the flat pattern pairs so well with full face gaskets in rubber or non-metallic composites. A straightforward geometry also makes alignment easier during installation, cutting assembly time and the chance of damaging the gasket on the way in.

Know where the limit sits. The flat face slip on flange performs at its best below 150 psi, which points it at water treatment, HVAC, food and pharmaceutical sanitary lines and general low pressure liquid or gas transmission, duties where cost effectiveness and easy installation count for more than extreme conditions. Where the service is harder, the raised face option in the same series is the one to specify.

Temperature changes the gasket, not the flange. Above 120°C, or where pressure approaches the class limit, the recommendation is to upgrade from the standard full face gasket to PTFE or graphite for reliability. The forged carbon steel body with black treatment covers 1/2 to 24 inch and Class 150 to 2500LB, so the same pattern can follow a line as it grows.

FAQ

Q1. Which gasket goes with the flat face?

A full face gasket, in rubber or a non-metallic composite, because the flat face is machined to seat the whole gasket rather than a ring. Above 120°C, or where pressure approaches the class limit, step up to PTFE or graphite. Fit it dry and centred on the bolt circle, and bring the flanges together square before tightening.

Q2. Where does a flat face stop being the right choice?

Around 150 psi. The flat face design is at its best below that, on water treatment, HVAC and sanitary lines where the joint is assembled by hand. Above it, or with an aggressive medium, specify the raised face version of the same flange so the bolt load lands on a ring of gasket instead of the full face.

Q3. Why is this flange easier to install?

The geometry is simple: a flat machined face, no groove and no tongue to line up. That makes alignment quicker during installation, which shortens assembly time and lowers the risk of damaging the gasket as the joint closes. On a line with many joints, that saving repeats at every flange.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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