Cold rolled black square and rectangular pipes are the precise choice for modern engineering and manufacturing of pipes. With the excellent shaping ability of cold rolling technology, we can shape regular square and rectangular structures with precise and accurate dimensions. It has excellent strength and toughness, and is widely used in various fields such as building structure support, mechanical manufacturing frames, furniture craftsmanship and modeling. The surface is smooth and flat, with superior processing performance, making it easy to perform complex operations such as cutting, welding, and bending. It provides efficient, reliable, and aesthetically pleasing pipe solutions for various projects, helping to build stable and creative structural systems.
| Standard | ASTM/ GB/ JIS/ EN Standard |
| Diameter | 10x10mm - 600x600mm Rectangular pipe: 20*40mm~400*700mm |
| Length | Fixed length in 6-12m or as per specified |
Parameter of Cold Rolled Square And Rectangular Tubes
Cold rolled square tubes and rectangular tubes are pipes with square or rectangular cross-sections made from hot-rolled steel strips or plates, which are deformed through multiple passes of cold rolling at room temperature. During the rolling process, it is possible to accurately control the dimensional parameters of the pipe, such as side length, wall thickness, and diagonal length, to achieve extremely high dimensional accuracy. Cold rolled square tubes and rectangular tubes come in a wide variety of specifications.
| Standard | ASTM/ GB/ JIS/ EN Standard |
| GB/T6728-2002, GB/T6725-2002, GBT3094-2000, JG 178-2005, ASTM A500, JIS G3466, EN10210 etc. | |
| Diameter | Square pipe: 10*10mm~600*600mm Rectangular pipe: 20*40mm~400*700mm |
| Thickness | Square and rectangular pipe: 0.5~20mm |
| Length | Fixed length in 6-12m or as per specifie d |
| Standard | Hollow section: ASTM A500, EN10219, EN10210, JIS3466, GB/T 6728 |
| Material | Gr.A, Gr.B, Gr.C; S235, S275, S355; A36, SS400; Q195, Q235, Q345,etc. |
| Finish of pipe | Hot dipped galvanized with zinc 220~260g/m2;Pre-Galvanized with zinc 30~150g/m2 Painted with black/varnish lacquer; Oil on the surface to prevent rust; Bare pipe without painting: |
| Pipe End | Plain end/ Bevel end; Groove end;Joint with flange; Threaded on two ends, one end with coupling, one end with plastic cap |
| Marking | As per client requirement or mill standard Painting method: Spray white paint |
| Packing | OD not less than 273mm: Loose packing,piece by piece. OD less than 273mm: In hexagonal seaworthy bundles packed by steel strips. Small sizes nested into big sizes. |
| Square Steel Pipe | |||||
| L1 (mm) | L2 (mm) | Thickness (mm) | L1 (mm) | L2 (mm) | Thickness (mm) |
| 10 | 10 | 0.3-1.0 | 115 | 115 | 2.0-12.0 |
| 12 | 12 | 0.3-1.0 | 120 | 120 | 2.0-16.0 |
| 15 | 15 | 0.4-1.4 | 135 | 135 | 2.0-16.0 |
| 10 | 10 | 0.5-1.5 | 140 | 140 | 2.0-18.0 |
| 18 | 18 | 0.4-1.5 | 150 | 150 | 2.0-20.0 |
| 20 | 20 | 0.5-2.0 | 160 | 160 | 3.0-20.0 |
| 25 | 25 | 0.5-2.5 | 180 | 180 | 3.0-20.0 |
| 28 | 28 | 0.5-1.5 | 200 | 200 | 4.0-22.0 |
| 30 | 30 | 0.5-4.0 | 220 | 220 | 4.0-22.0 |
| 35 | 35 | 0.6-1.8 | 240 | 240 | 4.0-22.0 |
| 40 | 40 | 0.6-6.0 | 250 | 250 | 4.0-22.0 |
| 50 | 50 | 07-6.0 | 260 | 260 | 4.0-25.0 |
| 60 | 60 | 0.7-6.0 | 280 | 280 | 6.0-25.0 |
| 70 | 70 | 0.9-6.0 | 300 | 300 | 6.0-25.0 |
| 75 | 75 | 1.0-7.5 | 350 | 350 | 6.0-25.0 |
| 80 | 80 | 1.0-8.0 | 400 | 400 | 6.0-25.0 |
| 90 | 90 | 2.0-10.0 | 500 | 500 | 6.0-25.0 |
| 100 | 100 | 1.5-12.0 | 600 | 600 | 6.0-25.0 |
| 110 | 110 | 2.0-12.0 | |||
| Rectangular Steel Pipe | |||||
| L1 (mm) | L2 (mm) | Thickness (mm) | L1 (mm) | L2 (mm) | Thickness (mm) |
| 18 | 10 | 0.4-0.8 | 150 | 80-100 | 3.0-14.0 |
| 20 | 8-14 | 0.4-2.0 | 160 | 80-130 | 5.0-16.0 |
| 25 | 12-20 | 0.5-1.5 | 175 | 100-150 | 5.0-20.0 |
| 30 | 10-20 | 0.5-2.5 | 180 | 80-150 | 3.0-20.0 |
| 38 | 25 | 0.7-1.5 | 200 | 80-160 | 3.0-20.0 |
| 40 | 10-30 | 0.7-3.75 | 220 | 120-200 | 3.0-25.0 |
| 45 | 20 | 1.5-4.0 | 250 | 100-225 | 4.0-25.0 |
| 50 | 10-40 | 0.6-4.0 | 260 | 90-175 | 6.0-25.0 |
| 60 | 20-40 | 0.6-5.0 | 280 | 120-240 | 6.0-25.0 |
| 70 | 20-50 | 1.0-6.0 | 300 | 100-250 | 4.0-24.0 |
| 75 | 50-45 | 2.0-8.0 | 310 | 210 | 7.0-25.0 |
| 80 | 40-60 | 0.7-0.8 | 320 | 200 | 7.0-25.0 |
| 90 | 50-60 | 2.0-8.0 | 350 | 150-300 | 7.0-25.0 |
| 100 | 20-80 | 1.0-9.0 | 360 | 200-350 | 7.0-25.0 |
| 110 | 60-75 | 3.0-10.0 | 400 | 150-300 | 7.0-25.0 |
| 120 | 60-100 | 3.0-14.0 | 450 | 150-350 | 7.0-25.0 |
| 125 | 90-100 | 3.0-143.0 | 450 | 150-350 | 7.0-25.0 |
| 130 | 120 | 3.0-14.0 | 600 | 200 | 8.0-25.0 |
| 140 | 80 | 3.0-10.0 | |||
Features of Cold Rolled Square And Rectangular Tubes
Cold rolling process ensures that square pipes and rectangular pipes have excellent dimensional accuracy. The errors of parameters such as side lengths, wall thicknesses, and diagonal lengths are controlled within a very small range, enabling them to meet the application scenarios with extremely demanding requirements for dimensions.
The surface of the pipe body is smooth and flat, without obvious defects like wrinkles or scratches. During subsequent processing operations such as spraying paint and electroplating, more uniform and firm coatings or plating layers can be obtained, which improves the quality and effect of surface treatment.
Possess relatively high strength and toughness and have excellent mechanical properties.
Convenient for processing operations such as cutting, drilling, welding, and bending. Moreover, during the processing, the mechanical properties and dimensional accuracy of the pipes can be well maintained.
Due to their various excellent characteristics, cold-rolled square pipes and rectangular pipes are widely used in many industries and fields.
Industries Using Steel
