QUALITY ASSESSMENT OF HADASSA STEEL
QUALITY ASSESSMENT OF HADASSA STEEL
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Date
1997-07
Authors
DAUDA, DAHIRU
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Abstract
ABSTRACT
An assessment of the quality of various sizes of
steel and the management of the steel rolling company
producing such product, as it affects quality of steel,
was undertaken. Various steel samples were obtained
directly from the company and physical test were carried
out on them. Field survey was also undertaken so as to
get information on the company especially as regards to
factors affecting the quality of its products.
Results of test as well as survey of the management
of the company shows that poor management results into
poor quality control and inferior product. Most of the
High tensile steel reinforcement bars failed as values of
characteristic strength of 270, 355 and 395 N/mm2 are far
below the values specified by BS 4449:1970, CP 110 and
BS 8110: 1984. Out of six different diameters produced by
the company, only one has a value of characteristic
strength of 309.4 N/mm2 as compared to 250 N/mm2 provided
in BS 4449. Most samples passed the test on deviation on
cross-sectional area as samples A,C,D,E and F have average
effective cross-sectional area of 467, 190, 109, 76.7 and
75.7 mm2 this represent average percentage deviation of -
5,-5.6, -3.5, -2.3 and -3.6 percent which is not up to the
maximum deviation of ±8 as contained in Bs 4449: 1970,
While sample B with an average percentage deviation of -
9.4 fails.
v Most samples also failed to satisfy the standard
requirement on deviation on Nominal mass, deviation on
nominal density and specific gravity. Cracks were
observed during Bend test on the 25 millimeters diameter
samples, as such they are deemed to have failed the test.
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Keywords
QUALITY ASSESSMENT, HADASSA STEEL