Conditions for Obtaining a Good Set of Properties for Low-Carbon Microalloyed High-Strength Steels Clad with Corrosion-Resistant Austenitic Steels

摘要

Conditions are studied for preparation with temperature and deformation treatment of a good set of mechanical properties and high quality rolled product characteristics for low-carbon Ti-Nb-V- and Mo-Timicroalloyed high-strength steels, clad with austenitic class corrosion-resistant chromium-nickel steels. It is established that an increase in uniformity of deformation for layers of a two-layer workpiece for steels of these types is facilitated by an increase in heating temperature and for the end of rolling to 1250 and 900A degrees C, respectively. In order to provide good process ductility of corrosion-resistant austenitic steels in this temperature range, their chemical composition should satisfy a condition Cr-equ/Ni-equ not more than 1.5-1.6. On the basis of modeling results of hot rolling in a Gleeble 3500 unit and a laboratory duo 300 rolling mill, it is shown that with the use of a high temperature for workpiece heating and for the end of rolling it is possible to achieve good strength properties (ultimate strength more than 850 MPa) for lowcarbon Ti-Nb-V- and Mo-Ti-microalloyed steels. Test results for clad rolled product prepared from four two-layer workpieces with a different combination of steels in layers points to the achievement not only of high strength for low-carbon microalloyed steels of one layer, but also other mechanical properties, and also high quality layer joint properties.