Clad steel rolled section for reinforcing concrete and method of production

Abstract

Clad steel roiled section suitable for reinforcing concrete is disclosed, which is produced from a bimetallic ingot comprising a basic material containing a group of alloy elements including Si and Al, and a surface layer of a ferritic or austenitic stainless steel containing a group of alloy elements including Cr and Ni, by hot rolling the ingot to an intermediate billet and a rolled section, and subjecting the rolled section to heat treatment. A feature of the reinforcing clad steel rolled products is that the basic material is steel containing, in percent by weight, from 1.0 to 5.0 Si and from 0.1 to 5.0 Al, with the proviso that 3.0≦(Si+Al)≦6.0. The reinforcing clad rolled products exhibit superior mechanical strength and impact toughness, improved corrosion resistance and high bond strength between the layers and with concrete. The clad rolled products are produced by a method involving making a bimetallic bar with a stainless steel surface layer, hot rolling the bar in several passes by calibrated rolls, the final rolling being effected by calibrated rolls with corrugated surface observing the relationship: H 0 ψ · d ≤ 1 where Ho is the maximum depth (height) of corrugations on the roll surface, d is the bar diameter, ψ is the relative thickness of the stainless layer.

Dependencies are inferred from the claim text.