Black square tube

The square steel tube is a welded structural product with internal welds
Houses, bridges, metal structures, uses
According to your size, we stock A513 or A500 Grade B

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Product Details

key word : Seamless Steel Pipe

Product introduction

If the cold rolled steel is heated to the annealing temperature, the surface color becomes black due to high temperature contact with air, it is called black annealing; Its surface is black without light treatment; The physical properties become soft, which is convenient for further welding into steel pipes; The common hardness is 57HRB, which can also be reduced to different hardness as required.
The black retreat square tube is a treated A3 square tube, which is designed to prevent the square tube from rusting; When the treated black square tube is welded, it will tear if it is not well treated. Of course, this kind of situation is relatively rare. There are many reasons for tearing, such as water on the surface of the welding matrix, rust on the surface, incorrect selection of welding rod, etc; In terms of performance, it is similar to stainless steel square tube; However, stainless steel looks more high-end, but the cost is much higher.

Technical data

Outer Diameter:	1515-500500mm
Length:	Max. 12 meters
Standard:	GB, ANSI,ASME,ASTM, JIS,DIN,BS,EN
Steel Grade:	Q195/Q215/Q235/Q345/10#/20#/ASTM A106 GRB
Packing:	Hexagonal bundles of max. 3,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper
Test:	Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.
SIZE:	Hot rolled:W.T: 1.0-25mm
	Cold rolled:W.T:0.6-1.5mm
Other Surface Treatment:	painted letter, embossed, painting
Usage:	For construction , structure,furniture, guardrail,fencing

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Our main manufactures are stainless steel, galvanized steel, carbon steel and etc. That apply to engineering, coal mine, textile, electric power, boiler, machinery, We stick to the principle of "quality first, service first, continuous improvement and innovation to meet the customers" for the management and "zero defect, zero complaints" as the quality objective. We′re pleased to get your Inquiry and we will come back to as soon as possible.

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power plant

Chemical plant

Oil Pipelines

refrigeration equipment

Water pipes

Bearing

chemical plant

Natural Gas Pipeline

QUALITY INSPECTION

We stick to the principle of "quality first, service first, continuous improvement and innovation to meet the customers" for the management and "zero defect, zero complaints" as the quality objective. We′re pleased to get your Inquiry and we will come back to as soon as possible.