A kind of hot-rolled steel strip for carriage plate and preparation method thereof

Abstract

The invention discloses a hot-rolled steel strip for carriage plates and a preparation method thereof. The mass fractions of the chemical components are: C: 0.05% to 0.1%, Si: 0.03% to 0.15%, Mn: 1.5% to 2.0%, P< 0.02%, S<0.005%, Al: 0.02%~0.05%, Nb: 0.03~0.05%, Ti: 0.08%~0.12%, Cr: 0.25%~0.5%, N≤40ppm, the rest is Fe and unavoidable Impurities. The method comprises the following steps: continuous casting slab heating, rough rolling and finishing rolling to obtain a hot-rolled plate; laminar cooling of the hot-rolled plate to 580-620° C. for coiling to obtain a hot-rolled steel strip for the carriage. The yield strength of the hot-rolled steel strip for the carriage plate is greater than 700MPa, the tensile strength is greater than 800MPa, the total elongation after fracture is greater than 20%, the plasticity and cold bending performance are excellent, and the wear resistance is good.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a hot-rolled steel strip for carriage panels and a preparation method thereof. Background technique [0002] Steel for dump truck body panels is mainly used for loading ore, sand, etc., and the use environment is relatively harsh, requiring good strength and smash resistance. With the continuous advancement of steel market technology, the dimensional accuracy and temperature control accuracy of steel materials have been significantly improved, but the research on surface quality has not yet made a breakthrough. The problem of the factory, as the environmental protection work continues to increase, the paint of the dump truck is forced to change from the oil-based paint to the water-based paint. Due to the poor adhesion of the water-based paint, it is more sensitive to the surface quality of the steel plate. While ensuring the strength, it is necessary to solve the pitt...

AI Technical Summary

Problems solved by technology

With the continuous advancement of steel market technology, the dimensional accuracy and temperature control accuracy of steel materials have been significantly improved, but the research on surface quality has not yet made a breakthrough. The problem of the factory, as the environmental protection work continues to increase, the paint of the dump truck is forced to change from the oil-based paint to the water-based paint. Due to the poor adhesion of the water-based paint, it is more sensitive to the surface quality of the steel plate. While ensuring the strength, it is necessary to solve the pit defects caused by the peeling off and pressing of the iron oxide scale on the surface of the steel plate during the flattening process

It can be seen from this that the hot-rolled steel strip for carriage panels in the prior art has problems such as low strength, poor anti-smashing performance, and peeling off of the iron sheet on the surface.

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