what is the forming technology of seamless square tube and its applications?

Wall thickness of seamless steel pipe is relatively thick, relatively small diameter thick. But the diameter is restricted, and its applications are limited, and production costs, especially for large diameter seamless steel pipe production costs are relatively high.

There are mainly three kinds of forming technology of seamless square tube: hot-rolled, cold-drawn and welded. For the cold drawn square tube, the ability of withstanding localized concentrated load is weak, the welding process produced pipe welds are the weak link, do not apply to the construction of high-end residential buildings.

Standard: ASTM A500, ASTM A53, EN 10210 ,EN 10219 ,JIS G 3466 ,BS 1387, BS 6323 ,IS : 1161,IS : 3601,IS : 3074 IS : 4923, DIN 1626, DIN 2394.
Out Diameter:10 *10mm – 500 * 500 mm
Wall Thickness: 0.5mm – 20mm
Length: 0.1 – 18 m as per customer’s request
Steel Grade: GB: Q195, Q215, Q235, Q345
ASTM: GR A, GR B, GR C, GR D, DC01, DC03, 1008, 1010 JIS: SS330, SS440, SS490, SPHD, SPHE
EN BS: S185, S235, S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H
End: Square cut, Burr removed
Surface: Lightly oiled, hot dip galvanized, Electro galvanized, Black
Heat Treatment: Bright Annealed, Black Annealed

Standard Corner Radius(Mechanical Sizes:)

Currently, the domestic general uses cold drawn or welded tube production. While the foreign mainly uses hot rolling process, fully able to meet the requirements of high-end buildings. The high-end hot-rolled seamless square tube construction is with good bearing properties, good weldability, low production costs and high production efficiency.

Straightness
Mechanical Sizes: Max. 1/16″ in 3 feet
Structural Sizes: Max. 1/8″ x Number of feet of total length divided by 5

Wall Thickness
Mechanical & Structural Sizes: ± 10% of Nominal Wall Thickness
Squareness of Sides
Mechanical Sizes: Max: ± b = c x 0.006″
b = Tolerance for out-of-square
c = Largest external dimension across flats
Structural Sizes: Adjacent sides may deviate from 90 ° by ± 2 °

It is understood that the hot-rolled seamless square tube due to structural features of its own, effectively circumvent the connection between the column and beam welding defects and leading to performance degradation, can significantly improve the problem of low efficiency of the traditional low-rise concrete structure, large pollution, waste of resources and other issues; at the same time, the product is with such good performance as the uniform force, high dimensional accuracy, high strength and good impact resistance, can improve the seismic resistance of high-end architecture, will be widely used in steel high-rise buildings, airports and other construction, and has become the main support materials of the construction industry in the future, with great market prospects.