This standard specifies section shape, sectional dimension, weight and tolerances, length and tolerances, shape, etc. of hot-rolled steel bars (round steel, square steel, flat steel, hexagonal steel and octagonal steel).
This standard is applicable to hot-rolled round steel with the diameter of 5.5mm~380mm, hot-rolled square steel with side length of 5.5mm~300mm, hot-rolled flat steel for general purpose with thickness of 3mm~60mm and width of 10mm~200mm, hot-rolled flat tool steel (the hot-rolled flat steel for general purpose and flat tool steel are hereinafter referred to as hot-rolled flat steel) with the thickness of 4mm~100mm and the width of 10mm~310mm, hot-rolled hexagonal steel with the opposite side distance of 8mm~70mm and hot-rolled octagonal steel with the opposite side distance of 16mm~40mm.
2 Section Shape
2.1 See Figure 1 for the section shape of hot-rolled round and square steels.
