150LB Slip-On Flange

QS Flange: Yancheng 150LB SO Flange

ASTM A182 F316L slip-on flange, 2 inch Class 150LB raised face per ASME B16.5, for low-pressure lines in corrosive chemical, marine and process service.

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One-Minute Overview

Slip-on flange forged from ASTM A182 F316L stainless steel.
2 inch, Class 150LB, raised face, ASME B16.5.
Fillet-welded inside and outside over the pipe end.
Resists chloride, pitting and crevice corrosion in process service.

This 150LB slip-on flange is forged from ASTM A182 F316L, a low-carbon molybdenum-bearing austenitic stainless steel chosen for its resistance to pitting, crevice corrosion and chloride attack. The raised face concentrates gasket compression for a tight seal, and the slip-on body slides over the pipe end before being fillet-welded inside and outside. At 2 inch Class 150 to ASME B16.5, it suits low-pressure lines where corrosion, not pressure, is the hard part.

Name: 150LB SO Flange
Standard: ASME B16.5
Material: ASTM A182 F316L
Face: Raised Face
Class: 150LB
Type: SO (Slip On)
Size: 2"

Where carbon steel would pit and leak, F316L keeps its passivity in acids, alkalis, seawater and high-purity water, which is why this flange shows up in chemical plants, desalination units, refinery cooling and fire-water circuits, and shipboard piping. The slip-on fit-up is forgiving: align, tack, then fillet weld inside and out to carry the load. Pair the raised face with spiral-wound, PTFE or flexible graphite gaskets, torque in a star pattern, and rely on the per-ASME marking for traceability.

FAQ

Q1. What actually goes on the raised face?

The raised face concentrates gasket compression, so fit a spiral-wound, PTFE or flexible graphite gasket rated for the service. Bolt up in a star pattern to the gasket maker's guidance and the 2 inch Class 150 joint stays tight through thermal cycles.

Q2. Why specify F316L rather than ordinary 304 stainless?

F316L is a low-carbon, molybdenum-bearing austenitic grade that resists pitting, crevice corrosion and chloride attack far better than 304. In chemical, marine and desalination service that margin decides whether the joint survives, and the low carbon also avoids sensitization during welding.

Q3. Is slip-on really good enough for a serious line?

For Class 150 work it is a classic: the flange slips over the pipe and gets fillet-welded inside and outside, which is strong enough for the pressure and far easier to fit up than a weld neck. Choose the joint for the duty, not the bragging rights.

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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