DETERMINATION OF THE VALUES OF MICROSTRUCTURAL AND MECHANICAL PARAMETERS OF A PEARLITIC 0.7%C-0.60/0.70%Mn STEEL WIRE ROD ENABLING TO ACHIEVE HIGH ABILITY TO DRAWING WITH THE USE OF LARGE CROSS SECTION REDUCTION

Abstract

The paper contains the results of microstructure investigation and measurement of mechanical properties of five batches of 5.5 mm diameter wire rod made of 0.7%C-0.60/0.70%Mn (C70D2/C72D2) carbon-manganese pearlitic steel, manufactured by five producers. The paper presents the analysis aimed at determining the values of parameters characterising the microstructure and mechanical properties of the wire rod allowing drawing with total a cross section reduction above 90%. The required values of wire rod microstructural parameters were determined on the assumption that they are achievable in existing contemporary production lines for wire rod rolling and controlled cooling after rolling. Physical drawing simulations, a wide range of quantitative microstructure tests using light microscopy and scanning electron microscopy, and measurement of mechanical properties were performed. Drawability verification trials with large cross section reduction were performed in an industrial wire drawing plant.

Analysis of the Uniformity of Mechanical Properties along the Length of Wire Rod Designed for Further Cold Plastic Working Processes for Selected Parameters of Thermoplastic Processing

“…In the technical literature on the rolling process, it is possible to find studies dealing with the influence of the production process parameters on the quality (mainly microstructure and mechanical properties) of the finished product [14][15][16][17][18][19][20][21][22][23][24][25]. Several groups of steels for wire rod production were described in [14], such as interstitial free (IF) ferritic steels, ferritic/martensitic steels, and pearlitic micro-alloyed steels.…”