Heat Treatment Of Some Nigerian Constructional . Steels And Its Technological Application
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if(~,:~::'::c~igerian constructional steils, NST 37-2 and NST 60Mn, were
~. ': h_eat· treated in various temperature ,, : quenching media of water,
·.mineral oil and air .to ascertain ti ... :1ardness for manufacturing
purpose. Results indicate that water seems to be the most
efficient ouenching media where maximum hardness is required.
However, where hardness can be used for quenching. NST 60Hn
steels, with higher Mn and C contents, showed greater hardness at
fast coolin~ rates. This greater hardness was due to the greater
amount of martensitic transformation and precipitation hardening of
carbides (Fe 3C2.. ·The air-cooled samples did not show much increase
in hardening because the steels transform more into ferrite with
very little pearlite. The technological importance of these
results are discussed in this paper to help the local manufacturing
companies in adopting any of the quenching media above, which would
suit their needs after the heat treatment. By so doing, the much
needed spare parts for machinery in Nigeria in particular, and
Africa 1n general can be produced locally.
Keywords
T Technology (General), TJ Mechanical engineering and machinery