Square Steel Tube, Square Steel Pipe

Square hollow sections are often used for columns, however similarly to RHS sections, they are not often used as beams due to its shape that makes it difficult to bolt to other beams and vice versa. SHSs are often called “box sections”. An example is 100 x 100 x 10 SHS, which is 100 mm deep, 100 mm wide and the wall is 10 mm thick. Similarly to RHS sections, hot rolled SHSs are made at the mill as one piece, whereas cold formed SHSs are made of a flat sheet rolled at right angles and welded. It is therefore easy to note the difference, as the cold rolled SHSs have a weld all along its length.

Standard	ASTM A500, EN 10210, EN 10219, JIS G3466, BS 1387, BS 6323 PART5
Grades	S185, S235, S235JR, S235 G2H, S275, S275JR, S355JRH, S355J2H, St37, ST52
Out diameter	10*10mm - 500*500mm
Wall thickness	0.5mm - 20mm

Surface Conditions                                          Special Features

Hot Rolled                                                         Hard to find sizes
Hot Rolled Pickled and Oiled                                 Mitre cutting
Cold Rolled                                                        High strength steel on request
KleenKote                                                          Mult lengths

Standard Corner Radius(Mechanical Sizes:)

Diameter (inch)	Wall Thickness (inch)	Radius Tolerance (inch)
1/2 to 1 1/2	0.028	1/32 to 1/16
1/2 to 2 1/2	0.035	1/32 to 1/16
1/2 to 4	0.049	3/64 to 5/64
1/2 to 4 1/8	0.065	1/16 to 7/64
3/4 to 4 1/8	0.083	5/64 to 1/8
over 4 1/8 to 6	0.095	3/16 to 5/16
1 to 4 1/8	0.095	3/32 to 5/32
over 4 1/8 to 6	0.109	3/16 to 5/16
1 1/4 to 4	0.109	1/8 to 13/64
over 4 to 6	0.120	3/16 to 5/16
1 1/4 to 4	0.120	3/16 to 5/16
over 4 to 6	0.134	7/32 to 7/16
2 to 4	0.148	3/16 to 5/16
over 4 to 8	0.148	7/32 to 7/16
2 to 8	0.165	1/4 to 1/2
2 to 8	0.180	1/4 to 1/2
2 1/2 to 4	0.203	5/16 to 9/16
over 4 to 8	0.203	5/16 to 9/16
2 1/2 to 8	0.220	3/8 to 5/8

Standard Corner Radius(Structural Sizes:)

Max. 3 x Nominal Wall Thickness

Mechanical Sizes		Structural Sizes
Largest Nominal Outside Dimension	Outside Tolerance at all Sides at Corners	Largest Nominal Outside Dimension	Outside Tolerance at all Sides at Corners
3/16 to 5/8	± 0.004	2 1/2 and under	± 0.020
over 5/8 to 1 1/8	± 0.005	over 2 1/2 to 3 1/2	± 0.020
over 1 1/8 to 1 1/2	± 0.006	over 3 1/2 to 5 1/2	± 0.030
over 1 1/2 to 2	± 0.008	over 5 1/2	± 1%
over 2 to 3	± 0.010
over 3 to 4	± 0.020
over 4 to 6	± 0.020
over 6 to 8	± 0.025

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 °

Maximum Twist (Mechanical & Structural Sizes)

Largest Dimension, inches	Max. Twist*, inches
over 1/2 to 1 1/2	0.050
over 1 1/2 to 2 1/2	0.062
over 2 1/2 to 4	0.075
over 4 to 6	0.087
over 4 to 8	0.100

Convexity & Concavity(Mechanical & Structural Sizes)

Largest Nominal O.D., Inches	Tolerance ± Inches
2 1/2 and under	± 0.010
over 2 1/2 to 4	± 0.015
over 4 to 8	± 0.025

Structural Tubing A 500 Requirements

Grades	Chemical					Physical
	C Max. %	Mn Max. %Max. %	P Max. %	S Max. %	Cu Max. %	Tensile strength, min. psi	Yield strength, min. psi	Elongation in 2 in.
Grade B	0.26	/	0.04	0.05	0.20	58,000	46,000	23
Grade C	0.23	1.35	0.04	0.05	0.20	62,000	50,000	21

EN10210 S355NH Rectangular/Square steel pipe