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Black square tube
Houses, bridges, metal structures, uses
According to your size, we stock A513 or A500 Grade B
Product Details
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: | 15*15-500*500mm |
| 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 |
key word : Seamless Steel Pipe
APPLICATION FIELD
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.
Mechanical
Pressure vessel
Power plant
Chemical plant
Oil Pipelines
Natural gas transportation
Water pipes
Automobile making
Bridge
Architecture
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We specialize in supply chain services for pipeline system projects in the oil and gas transportation, refining and chemical, marine and offshore, platforms, nuclear energy, and wind energy markets.
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Room 6010, Floor 6, Zhonghai City Plaza, Huangbohai New District, Yantai City, Shandong Province,China
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