Q235B Weld Neck Flange

QS Flange: Putian Weld Neck Flange

Q235B carbon steel weld neck flange, 1 inch 600LB RF with STD wall to ANSI B16.5, for pressure duty in plant, vessel and infrastructure piping.

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One-Minute Overview

Q235B carbon steel weld neck flange for 1 inch Class 600 joints.
Weld neck profile speeds fit up and cuts labour on site.
Raised face seats the gasket firmly against line pressure.
ANSI B16.5 dimensions keep it interchangeable with standard equipment.

The Q235B weld neck flange connects 1 inch pipe to valves, equipment and headers on Class 600 service. Q235B carbon steel gives the body the strength a flange needs to hold substantial pressure across a range of temperatures, while the STD wall leaves enough metal in the hub for stiffness. The raised face forms a defined seating band for the gasket, so the seal stays where it is put once the joint is pressurised.

Name: Q235B Weld Neck Flange
Size: 1"
Pressure: 600LB
Material: Q235B
Wall Thickness: STD
Flange Face: RF
Standard: ANSI B16.5
Feature: Easy and Quick Installation

A weld neck earns its place where the joint is permanent and the line is inspected. The neck is butt welded to the pipe, which gives a smooth transition at the bore, and the face then bolts to the mating valve or equipment. Fit up is quick: the neck self-aligns on the pipe end, the weld runs in a single pass and no alignment jig is needed, so the labour cost of each joint stays low.

In service the flange connects pipe, valves and other critical equipment across industrial plants, pressure vessels, water conservancy projects, electricity works and power station piping. It suits lines where a 600LB joint is broken only for planned maintenance, so the priority is a stiff, standard, dimensionally predictable connection rather than a reusable one.

FAQ

Q1. What does the 600LB rating mean in practice?

It places the joint well above the everyday 150LB classes, so the flange suits lines carrying substantial pressure over a wide temperature range. The class is fixed by ANSI B16.5, and the bolt circle, face and drilling come with it, so the flange pairs with valves and fittings that carry the same rating.

Q2. How quickly does it go on the pipe?

Quite quickly, and that is the point of the weld neck. The neck centres itself on the pipe end, so the fit up is a straight push and a tack rather than a fight with a jig. One butt weld then joins the two, and the face is ready for the gasket and the studs of the matching class.

Q3. Can I reuse it after unbolting?

The flange itself is not consumed, but it stays welded to the pipe, so unbolting separates the joint rather than removing the part. Change the gasket, inspect the raised face for nicks and clean it, then bring the studs back up in a star pattern. A scored or corroded face is the usual reason a reused joint weeps.

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.

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