16Mn Weld Neck Flange

QS Flange: CS 16Mn WN Flange

16Mn weld neck flange, 2 inch 900LB RF with STD wall to ANSI B16.5, for high pressure joints in vessels, water works and power station piping.

Quantity

Contact Now

add to cart

One-Minute Overview

16Mn weld neck flange for 2 inch Class 900 high pressure joints.
Tapered hub spreads load from the weld into the pipe.
Raised face holds gasket pressure at the 900LB rating.
ANSI B16.5 dimensions for standard bolting and gasket fit.

The 16Mn weld neck flange is a hub flange for 2 inch lines rated 900LB, which puts it in high pressure duty. The neck tapers from the flange ring down to the pipe wall so the butt weld is not the weakest point in the joint, and the raised face gives the gasket a controlled seating band instead of a bare flat plate. Every dimension follows ANSI B16.5, from the face to the bolt circle.

Name: 16Mn Weld Neck Flange
Size: 2"
Pressure: 900LB
Material: 16Mn
Wall Thickness: STD
Flange Face: RF
Standard: ANSI B16.5
Feature: Easy and Quick Installation

A Class 900 joint leaves little margin, so the details decide whether it holds. The hub has to be aligned to the pipe bore before welding, because any offset loads one side of the gasket harder than the other and the leak starts there. STD wall keeps the neck stiff enough to hold the face flat under bolt load, and the single pass butt weld keeps the heat input controlled so the neck does not pull out of square.

Bolt with studs of the matching class, bring them up in a star pattern in stages and check the face gap as the load comes on. The flange is used on pipeline fittings, pressure vessels, water conservancy works, electricity and power station piping, and anywhere a 2 inch line has to make a demountable high pressure joint to a valve or a vessel nozzle.

FAQ

Q1. What does 900LB mean for this joint?

It is a high pressure class, so the flange is built for lines where the operating pressure is far above the ordinary 150LB range. The class fixes the wall, the bolt circle and the drilling under ANSI B16.5, which is why the mating valve, gasket and studs all have to carry the same rating.

Q2. How do I line it up before welding?

Set the pipe end square, slide the neck on and check the bore for any step before you tack. Sight along the face and check it against the mating flange with a straight edge or a level; a flange welded out of square will not pull flat when the studs are tightened, and the gasket will leak on one side.

Q3. Which gasket should go with the raised face?

Pick a gasket rated for the same class and for the fluid, then match its inside diameter to the bore so it does not intrude into the flow. The raised face gives it a defined band to compress against, so torque is used efficiently. A gasket that is too soft for the class will creep; one that is too hard will not seal at the available bolt load.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

Send Message