Structure and Mechanical Properties of Steel in the Process "Pressing-Drawing"

Grain structure and mechanical properties of steel A570 GR36 alloy subjected to four passes via combined "pressing-drawing" process at room temperature were investigated. In the "pressing-drawing" process, the structure of the wire is significantly reduced to ultrafine-grained state; so in the steel of grade A570 GR36, the average grain size of 12 microns after deformation was reduced up to 20 times (0.6 microns). The values of tensile strength and yield strength increased after four passes from 380 to 740 MPa and from 220 to 680 MPa, respectively. The contraction changed from 63 to 55%, but the change was not as significant as under the classic drawing. The four-pass combined "pressing-drawing" process is an effective way to form UFG structure and improved mechanical properties in steel A570 GR36 alloy.