Application of dual phase steels in wires for reinforcement of concrete structures

H. LORUSSO, A. BURGUEÑO, D. EGIDI, H. G. SVOBODA

Procedia Materials Science

Elsevier

Lugar: Amsterdam; Año: 2012 vol. 1 p. 118 - 125

2211-8128

Dual Phase steels (DP) are part of the Advanced High Strength Steels (AHSS) family and consist in a ferritic matrix with a fraction of dispersed martensite between 5 and 50%, which gives the material a good combination of strength and ductility, with a significant capacity to absorb energy. Steel wires called in Argentina ATR500N, are used to manufacture steel welded framework, wires mesh and lattice girders for reinforcement of concrete structures and their mechanical requirements have defined in this country by the IRAM-IAS U500 526 standard. The current manufacturing process uses a wire rod of low carbon steel, hardened by cold working, producing a low ductility and low yield strength to tensile strength ratio product, although meet the requirements of the standard. The objective of the present work is to develop DP steels for ATR500N product, starting from the raw material used today and compare their mechanical properties to the commercial product. Several grades of DP steels were obtained and characterized microstructural and mechanically. Expressions of technological interest were developed, relating properties with fraction of martensite. Certain DP steels were slightly hardened by cold working and compared with the commercial ATR500N product. The DP steels developed fully satisfy the requirements of the standard and, in addition, a significantly higher elongation, hardening exponent and yield strength to tensile strength ratio. These characteristics are interesting for earth-quake resistant applications. A new manufacturing route could be developed for ATR500N product.