Annealing Square And Rectangular Tube

Black - annealed square and rectangular tubes are ordinary welded tubes. They are made by heating cold - rolled steel to the annealing temperature. Due to the high - temperature contact with air, the surface color turns black. Since the surface of this type of steel has not undergone bright - finishing treatment, it appears black. Its physical properties become softer, which is convenient for further welding to make steel tubes. The common hardness is 57HRB, and it can also be annealed to different hardness levels as required. The common material is Q195, and it has a wide range of applications.

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Time：2024-07-23

Location：HomeProductsWelded Steel Pipe > Annealing Square And Rectangular Tube > Annealing Square And Rectangular Tube

Overview
Features
Parameter
Application
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PRODUCT OVERVIEW

Overview

Black - annealed square and rectangular tubes are a common type of welded tubes. They are made by heating cold - rolled steel to the annealing temperature. The surface color turns black due to high - temperature contact with air. This type of steel has not undergone a bright - finishing treatment on its surface, so it appears black. Its physical properties become softer, which is convenient for further welding to make steel tubes. The common hardness is 57HRB, and it can also be annealed to different hardness levels as required. The commonly used material is Q195, and it has a wide range of applications.

product features

Features

a.High plasticity
b.Good ductility
c.Corrosion - resistant
d.Be widely used

technical parameters

Parameter

GB/T3091 - 2008. The common hardness is 57HRB, and it can also be annealed to different hardness levels according to requirements. Annealing is mainly a heat - treatment process for cold - rolled strips to recrystallize, eliminate cold - rolling work hardening, and restore plasticity so as to obtain the expected physical and physico - chemical properties. In the process flow, it is generally divided into pre - annealing, intermediate annealing and final annealing. Depending on different purposes, recrystallization annealing, incomplete annealing and full annealing are often used in the annealing process. In order to obtain strips with no oxidized and decarburized surfaces, the strips are subjected to bright annealing in a protective atmosphere.

application field

Application