Socket Welding Flange with Collar for Alloy - Brief Introduction

Socket-welding flange for alloy, represented by the English letter "SO".

Alloy flanged flat welding neck flange, also known as alloy necked flat welding flange; in some regions, it is also referred to as SO flange.

Alloy steel is steel that, in addition to iron and carbon, contains other alloying elements.

Alloy Flanged Socket Welding Flange - Key Features

A socket weld flange made of an iron-carbon alloy, which is a ferrous alloy formed by adding one or more alloy elements in appropriate amounts to ordinary carbon steel.

Based on different elements added and appropriate processing techniques, special properties such as high strength, high toughness, wear resistance, corrosion resistance, resistance to low and high temperatures, and non-magnetism can be achieved.

Specification Model

DN15~DN600

Pressure Rating

PN Series: PN6 to PN40

Sealing surface type

Rounded Face (RF), Flat Face (FF), Milled Face (MFM), Concave Face (FM), Milled (M), Tongue and Groove (TG)

The concave-convex surface (MFM) is for配套 use.

Alloy Socket Weld Flange with material specification So

ASTM A182 F1、 F5a、 F9、 F11、 F12、 F22、 F91、A182F12、A182F11、16MnR、Cr5Mo、12Cr1MoV、15CrMo、12Cr2Mo1、A335P22、St45.8/Ⅲ;

Among the commonly used materials are 12Cr1MoV, 15CrMo, and 16MnR.

Standard of Implementation

National Standards, Chemical Industry Department Standards, American Standards, German Standards, Japanese Standards, etc.

Connection Type

Similar welding process as flat welding flange; single-sided welding, double-sided nut connection.

In simple terms, it involves inserting the pipe into the inner diameter of the neck butt-welding flange and welding it in place, then securing both sides with bolts and nuts.

Production Process

Overall forging

The advantages of alloy socket weld flanges

Alloy flanges contain more other elements compared to carbon steel flanges.

2: An alloy flange is a type of steel that, in addition to containing silicon and manganese as alloying elements or deoxidizing elements, also includes other alloying elements, and some may contain certain non-metallic elements.

3: Depending on the amount of alloying elements in the steel, it can be further divided into low-alloy steel, medium-alloy steel, and high-alloy steel.

4: Carbon steel flanges primarily refer to steels where the mechanical properties depend on the carbon content in the steel, and generally do not contain a large amount of alloy elements. They are sometimes also known as plain carbon steel or carbon steel.

Procurement Recommendations

1: Recommend purchasing from a reputable alloy flanged socket welding elbow manufacturer, which should have a certain production scale.

2: manufacturers of flanges are required to provide material inspection reports and related documents for necked butt-welding flanges.

3:颈平焊法兰 must have corresponding specification and model stamping and identification.