Annealing Welded Round Pipe

Black return pipe is a common welded pipe that is heated from cold-rolled steel to annealing temperature, and its surface color turns black due to high temperature contact with air.

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Time：2024-07-23

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Overview
Features
Parameter
Application
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PRODUCT OVERVIEW

Overview

Black return pipe is a common welded pipe that is heated from cold-rolled steel to annealing temperature, and its surface color turns black due to high temperature contact with air. The surface of this steel has not undergone bright treatment, so it appears black. The physical properties become softer, making it easier to further weld into steel pipes. The common hardness is 57HRB, which can also be reduced to different hardness levels as needed. The usual material is Q195, which has a wide range of applications.

product features

Features

a. Strong plasticity
b. Good extensibility
c. Corrosion resistance
d. Widely applicable

technical parameters

Parameter

GB/T3091-2008, The common hardness is 57HRB, and it can also be reduced to different hardness levels as needed.
Annealing is mainly a heat treatment process that recrystallizes cold-rolled strips, eliminates cold rolling work hardening, restores plasticity, and obtains the expected physical and physicochemical properties.
The process flow is generally divided into pre annealing, intermediate annealing, and finished annealing.
The annealing process often uses recrystallization annealing, incomplete annealing, and complete annealing depending on the purpose.
In order to obtain a surface oxidation free and decarburization free strip, the strip is subjected to bright annealing in a protective atmosphere.

application field

Application