Vanadium-silicon microalloyed super-strength wire rod and production process thereof

Abstract

The invention discloses a vanadium-silicon microalloyed super-strength wire rod and a production process thereof. The vanadium-silicon microalloyed super-strength wire rod comprises basic chemical components including, by weight, 0.85-0.95% of C, 0.95-1.10% of Si, 0.50-0.60% of Mn, 0.20-0.35% of Cr, 0.01-0.05% of Ti, 0.005-0.050% of Al, 0.11-0.15% of V, selective components, including any of 0.01-0.15% of Ni, 0.001-0.25% of Cu, 0.0001-0.005% of B, 0.001-0.03% of Nb and 0.001-0.03% of M, the balance of Fe and impurities. The production process includes sequentially performed steps of heating, rolling and cold controlling. The cold controlling step uses Stelmor controlled cooling, cooling speed before phase change is above 10K / s, and the cooling speed in late phase change is 1-3K / s. The vanadium-silicon microalloyed super-strength wire rod is more than 13700MPa in tensile strength, more than 35% in section shrinkage and more than 95% in sorbite rate, and is applicable to production of products such as super-strength prestress steel strands and galvanized steel strands.

Description

technical field [0001] The invention particularly relates to a vanadium-silicon composite micro-alloyed ultra-high-strength wire rod and a preparation process thereof, belonging to the fields of iron and steel metallurgy and steel rolling. Background technique [0002] The construction of bridges, highways, power stations and high-rise buildings requires a large number of prestressed steel strands and galvanized steel wires. With the increasing span of bridges, the strength requirements for prestressed steel strands and galvanized steel wires for bridges are also getting higher and higher. High-strength and large-scale are the main development directions of prestressed steel strands and galvanized steel strands, and high-strength and high-toughness steel wires are an inevitable trend to meet market demand. [0003] The improvement of wire strength can reduce the amount of building materials used, shorten the construction period, and save construction costs. By improving th...

AI Technical Summary

Problems solved by technology

The existence of central segregation makes it easy to produce harmful structures such as martensite in the center of the wire rod, which will have a negative impact on the mechanical properties and drawing properties of the wire rod.

The generation of reticular cementite causes brittle fracture of the wire rod, which is extremely harmful to the performance of the wire rod

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