Hot and cold composite formed square and rectangular steel tube with thickened corners and production method
View Patent ↗A hot and cold composite formed square and rectangular steel tube and a production method for the same are provided. The radius of an outer corner of the square and rectangular steel tube meets the following conditions: when t is less than or equal to 6 mm, R is greater than 0 and less than 2.0 t; when t is greater than 6 mm and less than or equal to 10 mm, R is greater than 0 and less than 2.5 t; when t is greater than 10 mm, R is greater than 0 and less than 3.0 t, wherein t is the wall thickness of a straight tube part of the square and rectangular steel tube; R is the radius of each of the outer corners of the four corners of the square and rectangular steel tube; and the wall thickness of each corner of the square and rectangular steel tube is between 1.0 t and 1.8 t.
1. A steel tube, comprising:
a square and rectangular steel tube with thickened corners formed by hot and cold composite, wherein a cross section of the square and rectangular steel tube is in a square or a rectangular shape, the square and rectangular steel tube further comprises a straight tube and four corners, and radius of an outer corner of the square and rectangular steel tube meets one of following conditions:
when wall thickness (t) of the straight tube of the square and rectangular steel tube is less than or equal to 6 mm, radius (R) of each of outer corners of the four corners of the square and rectangular steel tube is greater than 0 and less than 2.0 t;
when t is greater than 6 mm and less than or equal to 10 mm, R is greater than 0 and less than 2.5 t; and
when t is greater than 10 mm, R is greater than 0 and less than 3.0 t; and
wherein wall thickness of each corner of the square and rectangular steel tube is in a range of 1.0 t to 1.8 t.
2. The steel tube of claim 1 , wherein the radius of the outer corner of the square and rectangular steel tube further meets one of following conditions:
when t is less than or equal to 6 mm, R is greater than 0 and less than 1.5 t;
when t is greater than 6 mm and less than or equal to 10 mm, R is greater than 0 and less than 2.0 t; and
when t is greater than 10 mm, R is greater than 0 and less than 2.5 t.
3. The steel tube of claim 1 , wherein the radius of the outer corner of the square and rectangular steel tube further meets one of following conditions:
when t is less than or equal to 6 mm, R is greater than 0 and less than 0.5 t;
when t is greater than 6 mm and less than or equal to 10 mm, R is greater than 0 and less than 0.75 t; and
when t is greater than 10 mm, R is greater than 0 and less than 1.0 t.
4. The steel tube of claim 1 , wherein the wall thickness of each corner of the square and rectangular steel tube is in a range of 1.0 t to 1.2 t.
5. The steel tube of claim 1 , wherein a perimeter of the cross section of a square and rectangular steel tube with a single welded seam is in a range of 80 mm to 4800 mm; and
the wall thickness of the straight tube of the square and rectangular steel tube with the single welded seam is in a range of 6 mm to 70 mm.
6. The steel tube of claim 1 , wherein a perimeter of the cross section of a square and rectangular steel tube with double welded seams is in a range of 1600 mm to 9600 mm; and
the wall thickness of the straight tube of the square and rectangular steel tube with the double welded seams is in a range of 20 mm to 80 mm.