Description
Hot Rolled Commercial Quality Steel is ordinarily
produced in a low carbon grade of steel. It is suitable for
many applications where the presence of oxide and normal surface
defects are not objectionable.
Hot rolled commercial quality is ordinarily produced from
rimmed, capped, or semi-killed steel, at the producer’s
option, with sufficient discard taken to remove visible piping.
Because of the segregation inherent in the solidification of
these types of steel, they do not have a high degree of uniformity
in chemical composition and mechanical properties.
When a carbon content is not specified commercial quality
is furnished to a maximum carbon limit of 0.15 per cent by ladle
analysis.
The oxide on hot rolled commercial quality is subject to variations
in thickness, adherence and color. Removal of the oxide will
reveal surface defects not readily visible prior to this operation.
Sheets of this quality sometimes show imperfections after
deformation which were not clearly visible on the sheet as produced.
Such imperfections may be expected on hot rolled commercial
quality sheets. Sheets of this quality should not contain piped
steel.
Hot rolled commercial quality sheets are subject to coil breaks,
stretcher strains and fluting in the hot rolled condition. This
quality can be furnished with non-fluting properties when specified.
Hot rolled commercial quality should meet minimum bend test
requirements. Bend test requirements do not apply to commercial
quality sheets specified over 0.25 per cent carbon by ladle
analysis. Hot rolled commercial quality is not subject to any
other mechanical test requirements. If greater ductility than
the minimum is indicated, the bend test is required, drawing
quality should be specified.
If specific mechanical test values are required, physical
quality should be specified.
Special killed steel, special soundness steel, normalizing,
box annealing or other added processes or practices are additional
requirements that are sometimes specified. Special surface requirements
should be specified when applicable.
Sheets of this quality up to 0.15 per cent carbon maximum
are frequently specified to ASTM A1011, Hot Rolled Carbon Steel
Sheets, Commercial Quality. Sheets meeting the requirements
of this specification are generally available as stock material.
