Mechanical Properties of Cold-Drawn Low Carbon Steel for Nail Manufacture: Experimental Observation

Abstract: The objective of this study is to investigate the influence of service situation on the mechanical properties of

plain nails manufactured from low carbon steel. The influence of the degree of cold drawing on the mechanical properties

and strain hardening of the material is investigated by tensile test experimentation. The stress-strain relationships of the

cold-drawn low carbon steel were investigated over the 20, 25, 40 and 55% degree of drawn deformation for the

manufacture of 4, 3, 2½ and 2 inches nails, respectively. The true stress-strain curves were analyzed to obtain the yield

strength and tensile strength of the cold drawn steel. It is shown that the yield strength, tensile strength, hardness and

toughness of the low carbon steel reduce with increasing degree of cold-drawn deformation. The micrographs of the

deformed samples obtained using optical microscope shows that the grain structure elongates in the direction of the

drawing operation and misorientation of the grains set in at 40 and 55% degree of deformation. The difference in yield

strength was attributed to the strain hardening, resulting from the different degrees of drawn deformation.

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