Effects of Process Annealing on Mechanical Properties of Strain hardened (NS 34 LC) ‎Coiled Wire

Abstract

ABSTRACT The effects of annealing on the mechanical properties of strain hardened coiled-rolled wire of low carbon steel, which is used for ‎manufacturing barbed wire, office pins, nails and fencing were investigated in this paper. The as-received coiled-rolled wire was ‎strain-hardened by drawing it through drafts of 30.56, 55.56, 75.00 and 88.89%, respectively. This was followed by process ‎annealing at 400, 500 and 6500C. The tensile strength, yield stress, hardness, percentage reduction in area and percentage ‎elongation of the annealed specimens were evaluated and compared with values for commercial specimens. The results obtained ‎showed that NS 34 LC rolled coiled wire attains its full hardness or full brittleness at 88.89% strain hardening. It was observed that ‎for optimal mechanical properties of cold worked coiled wire of the low carbon steel, the material should not be strain hardened ‎beyond the drawing of 75% draft and should be critically annealed at 6500C for soaking time of 15 minutes before further ‎deformation‎