The company has 400×400mm and 250×250mm square and rectangular high-frequency welded steel pipe production lines each, which can produce 200,000 tons of square and rectangular high-frequency welded steel pipes every year. Products are widely used in various large-scale buildings and large-scale machinery and equipment and other fields.
Steel grade: Q235~Q355.
Executive standard: GB/T 6725-2017, GB/T 6728-2017 and other domestic and foreign standards of similar products and other higher standards.
方矩形钢管生产工艺流程图
Process video
Product main parameters (GB/T 6728-2017):
Wall thickness deviation:
When the wall thickness is t≤10.0mm:
Wall thickness deviation: ±0.1t.
When the wall thickness is t>10.0mm:
Wall thickness deviation: ±0.08t.
External arc radius:
When the wall thickness is t≤3.0mm:
Carbon steel (ReL≤320MPa): (1.0~2.5)t; low alloy steel (ReL>320MPa): (1.5~2.5)t.
When the wall thickness is 3.0<t≤6.0mm:
Carbon steel (ReL≤320MPa): (1.5~2.5)t; low alloy steel (ReL>320MPa): (2.0~3.0)t.
When the wall thickness is 6.0<t≤10.0mm:
Carbon steel (ReL≤320MPa): (2.0~3.0)t; low alloy steel (ReL>320MPa): (2.0~3.5)t.
When the wall thickness is t>10.0mm:
Carbon steel (ReL≤320MPa): (2.0~3.5)t; low alloy steel (ReL>320MPa): (2.5~4.0)t.
Plane convexity/concavity:
The convexity and concavity of the plane part of the section of section steel should not exceed 0.6% of the side length, but the minimum is 0.4mm.
Bending angle:
The deviation of the bending angle of section steel shall not be greater than ±1.5°.
Straightness deviation:
The curvature of section steel shall not be greater than 2mm per meter, and the total curvature shall not be greater than 0.15% of the total length.
Length deviation:
Length deviation: 3~20m.
If customers have higher requirements for quality, they can be negotiated.
Square steel pipe specification table
20×20×(1.2-2)mm (Size deviation:±0.5mm) | 90×90×(3-7)mm (Size deviation:±0.75mm) | 180×180×(4-10)mm (Size deviation:±1.40mm) |
30×30×(1.5-3)mm (Size deviation:±0.5mm) | 100×100×(4-8)mm (Size deviation:±0.80mm) | 200×200×(4-12)mm (Size deviation:±1.60mm) |
40×40×(1.5-4)mm (Size deviation:±0.5mm) | 120×120×(4-8)mm (Size deviation:±0.90mm) | 220×220×(4-14)mm (Size deviation:±1.80mm) |
50×50×(1.5-4.5)mm (Size deviation:±0.5mm) | 130×130×(4-10)mm (Size deviation:±1.00mm) | 250×250×(5-14)mm (Size deviation:±2.00mm) |
60×60×(2-5)mm (Size deviation:±0.6mm) | 135×135×(4-10)mm (Size deviation:±1.00mm) | 300×300×(6-14)mm (Size deviation:±2.40mm) |
70×70×(2.5-5)mm (Size deviation:±0.65mm) | 140×140×(4-10)mm (Size deviation:±1.10mm) | 350×350×(8-14)mm (Size deviation:±2.80mm) |
80×80×(2.5-6)mm (Size deviation:±0.70mm) | 150×150×(4-10)mm (Size deviation:±1.20mm) | 400×400×(8-14)mm (Size deviation:±3.20mm) |
Rectangular steel pipe specification table
30×20×(1.5-2.5)mm (Size deviation:±0.50mm) | 80×60×(3-5)mm (Size deviation:±0.70mm) | 200×150×(4-10)mm (Size deviation:±1.50mm) |
40×20×(1.5-3)mm (Size deviation:±0.50mm) | 90×50×(3-5)mm (Size deviation:±0.75mm) | 220×140×(4-12)mm (Size deviation:±1.50mm) |
40×25×(1.5-3)mm (Size deviation:±0.50mm) | 100×50×(3-5)mm (Size deviation:±0.80mm) | 250×150×(4-12)mm (Size deviation:±1.60mm) |
40×30×(1.5-3)mm (Size deviation:±0.50mm) | 120×60×(3-6)mm (Size deviation:±0.90mm) | 260×180×(5-14)mm (Size deviation:±1.80mm) |
50×25×(1.5-3)mm (Size deviation:±0.50mm) | 120×80×(3-6)mm (Size deviation:±0.90mm) | 300×200×(5-14)mm (Size deviation:±2.00mm) |
50×30×(1.5-4)mm (Size deviation:±0.50mm) | 140×80×(4-7)mm (Size deviation:±1.00mm) | 350×250×(6-14)mm (Size deviation:±2.20mm) |
60×30×(2-4)mm (Size deviation:±0.60mm) | 150×100×(4-8)mm (Size deviation:±1.20mm) | 400×200×(6-14)mm (Size deviation:±2.40mm) |
60×40×(2-4)mm (Size deviation:±0.60mm) | 160×80×(4-8)mm (Size deviation:±1.20mm) | 400×250×(6-14)mm (Size deviation:±2.60mm) |
70×50×(2-5)mm (Size deviation:±0.60mm) | 180×100×(4-10)mm (Size deviation:±1.30mm) | 450×250×(8-14)mm (Size deviation:±2.80mm) |
80×40×(2-5)mm (Size deviation:±0.70mm) | 200×120×(4-10)mm (Size deviation:±1.40mm) | 500×300×(8-14)mm (Size deviation:±3.20mm) |