CS 45 Weld Neck Flange

QS Flange: Wenzhou CS 45 WN Flange

Forged CS 45 medium-carbon steel weld neck flange, 1 inch 150LB RF with STD wall, dimensioned to ANSI B16.5 for leak-free pipe joints.

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One-Minute Overview

Forged CS 45 carbon steel weld neck flange for 1 inch Class 150 pipe joints.
Raised face concentrates gasket load for a tight seal as temperature and pressure shift.
Tapered hub carries weld stress into the pipe wall instead of the joint.
Dimensioned to ANSI B16.5, so it mates with standard Class 150 valves and fittings.

The CS 45 weld neck flange joins a 1 inch pipe to a valve, vessel or header through a butt-welded hub and a bolted face. CS 45 is a medium-carbon steel chosen for tensile strength and impact resistance, so the flange keeps its shape where mechanical loads run high. The raised face concentrates bolt load on the gasket, which holds the joint tight while temperature and pressure move.

Name: CS 45 Weld Neck Flange
Size: 1"
Pressure: 150LB
Material: CS 45
Wall Thickness: STD
Flange Face: RF
Standard: ANSI B16.5
Feature: Easy and Quick Installation

The tapered hub is the reason to pick a weld neck over a slip on for this job. Its wall steps down from the flange ring to the pipe wall, so the butt weld sits on a gentler stress path and cyclic loading spreads over more metal. STD wall leaves a working corrosion allowance and enough stiffness to keep the face flat under bolt load. Weld the bore to the pipe in a single pass, then bolt with studs of the matching Class 150 set and tighten in a star pattern to the gasket maker's torque.

These flanges go onto pipeline fittings, pressure vessels, water conservancy works, electricity and power station piping, where a 150LB joint carrying water, low-pressure steam, oil or gas has to stay leak free year after year.

FAQ

Q1. What standard fixes the dimensions and facing?

ANSI B16.5 sets the raised face, the bolt circle, the bolt hole spacing and the 150LB rating. The flange therefore lands on any standard Class 150 valve, fitting or vessel nozzle of the same size, with the same gasket and the same bolting as the rest of the line. No adapter, no re-drilling.

Q2. Can I just bolt it in, or does it need welding?

It needs welding at the pipe end. The hub is butt welded to the 1 inch pipe, and the bolted end then faces the valve, nozzle or matching flange. If you want a flange that simply slips over the pipe without a butt weld, a slip on is the cheaper route; a weld neck is for joints that must stay tight.

Q3. What does the STD wall thickness actually give me?

STD is the standard wall for this size, so the bore lines up with common pipe schedules and the hub keeps a working corrosion allowance. It also gives the neck enough stiffness that the raised face stays flat when the studs are tightened, which is what keeps gasket load even around the whole ring.

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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