SS 304 SO Flange

QS Flange: Ningbo SS 304 SO Flange

Forged SS 304 SO flange, 3 inch 150LB RF per ANSI B16.5, connects equipment or pipe by fillet weld directly.

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One-Minute Overview

Forged SS 304 SO flange that links equipment or pipe by fillet weld.
3 inch size, 150LB class, raised face, dimensioned to ANSI B16.5.
ASTM A182 F304 stainless steel resists corrosion in chemical and general industrial service.
Pick it where a welded, leak-tight joint with easy alignment is wanted.

The SS 304 SO flange joins equipment or pipe runs with a fillet weld instead of a butt weld, so alignment on site is quick and forgiving. Forged from ASTM A182 F304 stainless steel, it carries the corrosion resistance of 304 steel in a 3 inch 150LB pressure part. Every dimension follows ANSI B16.5, so the flange matches standard gaskets, bolting and mating flanges of the same class.

Name: SS 304 SO Flange
Size: 3"
Pressure: 150LB
Material: ASTM A182 F304
Flange Face: RF
Process: Forged
Standard: ANSI B16.5

Because the joint is made by fillet weld directly, the flange suits skid-mounted equipment, valve outlets and pipe headers where a full-penetration butt weld would slow the crew. The raised face concentrates bolt load on the gasket for a tight seal at 150LB, and the low carbon content of A182 F304 keeps the weld clean. Bolt with class-matching stud bolting and tighten evenly in a star pattern. Confirm the mating flange is also 3 inch 150LB before fit-up, and keep the raised face free of nicks during handling; where the line sees vibration, re-check bolt torque after the first heat-up cycle.

FAQ

Q1. Which standard governs this flange's dimensions and pressure rating?

ANSI B16.5 governs the dimensions, bolt drilling and the 150LB class rating of this 3 inch flange. The raised face finish follows the same standard, so it mates directly with standard weld neck, slip on and socket weld flanges of the matching class, with no adapter needed.

Q2. Can I weld it straight onto my pipe or equipment?

Yes, that is exactly how it is used. The flange connects to equipment or pipe by fillet weld directly, which makes fit-up quick on site. Match the gasket to the service, bolt up the raised face joint, and run the fillet weld called for by your welding procedure.

Q3. Why pay for stainless when carbon steel is cheaper?

Because rust never sends an invoice on time. ASTM A182 F304 keeps the pressure boundary clean in water and mildly corrosive chemical service, where a carbon steel flange can corrode and force early replacement. One good forging saves the shutdown you would spend swapping a rusty flange later.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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