Hot Finished Rectangular Hollow Sections - 400x300x8.0

Hot-finished rectangular hollow sections (RHS) are flat-sided, box-shaped steel tubes manufactured at very high temperatures to ensure a uniform metal structure. Shaping the steel while it is red-hot eliminates the internal stresses found in cold-formed alternatives, making these tubes highly reliable under heavy loads and easier to weld or cut. Their rectangular profile provides superior bending strength along their deeper axis, while the flat faces allow for quick and easy connections to other structural parts. These robust tubes are widely used in demanding engineering applications, such as heavy bridge trusses, building columns, and large-scale industrial frameworks.

Dimensions

PropertyValue
D mm400
B mm300
t mm8
kg/m85.4
A cm2109

Full sortable table: Dimensions table for this category

Section Properties

PropertyValue
Ratios for Local Buckling - d/t(1)47
Ratios for Local Buckling - b/t(1)34.5
Second Moment of Area (x-x) - cm425700
Second Moment of Area (y-y) - cm416500
Radius of Gyration (x-x) - cm15.4
Radius of Gyration (y-y) - cm12.3
Elastic Modulus (x-x) - cm31290
Elastic Modulus (y-y) - cm31100
Plastic Modulus (x-x) - cm31520
Plastic Modulus (y-y) - cm31250
Torsional Constants - J cm431000
Torsional Constants - C cm31750
Surface Area (Per Metre) - m21.38
Surface Area (Per Tonne) - m216.2

Full sortable table: Properties table for this category