scope:

This specification covers hot-wrought merchant quality carbon steel bars and bar size shapes produced to mechanical property requirements and intended for noncritical constructional applications. (See Section 3.2.)

Merchant quality hot-wrought steel bar is available in the following ranges of size and section: 

Rounds, squares, and hexagons with diameters or distance across flats less than 75 mm [3 in.]. 

Bar size shapes with maximum dimensions less than 75 mm [3 in.]. 

Other bar sections with weight per foot less than 60.78 kg/m [40.84 lb/ft]. 

Flats 150 mm [6 in.] or less in width, more than 5.156 mm [0.203 in.] in thickness, and less than 60.78 kg/m or 77 cm² [40.84 lb/ft or 12 in.²] in cross-sectional area.

Flats over 50 to 200 mm [6 to 8 in.] inclusive in width, 6 mm [0.230 in.] in thickness, and under 60.78 kg/m or 77 cm² [40.84 lb/ft or 12 in.²] in cross-sectional area.

Hot-wrought merchant quality carbon steel bars subject to mechanical property requirements are hot-wrought in straight lengths only.

Some applications may require one or more of the available designations shown under supplementary requirements.

Note 1-Special quality hot-wrought carbon steel bars subject to mechanical property requirements are covered in M 255M/ M 255.

This specification is applicable to orders in either SI units (as M 227M) or inch-pound units (as M 227). SI units and inch-pound units are not necessarily equivalent. Inch-pound units are shown in brackets in the text for clarity, but they are the applicable values when the material is ordered to M 227.