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Square tube is formed from coil and then ran through a series of dies.lt's welded from the inside to form its shape. Square tubes are generally used for maintenance and structural purposes.
Some examples of square tubing applications would be building construction, railings, and sign posts. They are measured by their outside dimensions and their wall thickness.
square Tube is available in the following metal types:Alloy Steel
Mild Steel Carbon Steel stainless Steel
Square tube has similar uses to RHS and is used for both industrial and construction applications. Square section RHS is available in the same thicknesses as RHS and dimensions range from 20 mm x 20 mm to 400 mm x 400 mm.
|
NPS Designator |
Permissible Variations in Outside Diameter |
|
|
Over In. |
Under In. |
|
|
1/8 to 1-1/2, incl |
1/64 (0.015) |
1/32 (0.031) |
|
Over 1-1/2 to 4, incl |
1/32 (0.031) |
1/32 (0.031) |
|
Over 4 to 8, incl |
1/16 (0.062) |
1/32 (0.031) |
|
Over 8 to 18, incl |
3/23 (0.093) |
1/32 (0.031) |
|
Steel Grades |
Chemical composition( cast or product analysis ％ max. |
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|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Al |
Ti |
Micro-alloying elements |
CE |
|
|
C250 C250L0 |
0.12 |
0.05 |
0.5 |
0.03 |
0.03 |
0.15 |
0.1 |
0.1 |
0.04 |
0.03 |
0.25 |
|
C350 C350L0 |
0.2 |
0.25 |
1.6 |
0.03 |
0.03 |
0.3 |
0.1 |
0.1 |
0.04 |
0.15 |
0.43 |
|
C450 C450L0 |
0.2 |
0.25 |
1.7 |
0.03 |
0.03 |
0.3 |
0.35 |
0.1 |
0.04 |
0.15 |
0.43 |
|
Steel Grade |
Minimum yield strength |
Minimum tensile strength |
Minimum elongation as a propertion of the gauge length of5.65 ％ |
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|
Circular hollow sections |
Rectangular hollow sections |
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|
≦15 |
>15≦30 |
30 |
≦15 |
>15≦30 |
30 |
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|
C250,C250L0 |
250 |
320 |
18 |
20 |
22 |
14 |
16 |
18 |
|
C350,C350L0 |
350 |
430 |
16 |
18 |
20 |
12 |
14 |
16 |
|
C450,C450L0 |
450 |
500 |
12 |
14 |
16 |
10 |
12 |
14 |
|
Characteristic |
Pipe (CHS) |
Rectangular & Square (RHS / SHS) |
|
|
External dimensions (d, b, d0) |
±1% with minimum of ±0.5mm& maximum ±10% |
±1% with minimum of ±0.5mm |
|
|
Thickness (t) |
d≤406.4mm |
±10% |
±10% |
|
|
d>406.4mm |
±10% with max of ±2mm |
|
|
All Sections has a mass not less than 96% of specified nominal mass |
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