High surface quality hot rolled steel plate used for manufacturing swing arm of excavator, and manufacturing method thereof

Abstract

The invention discloses a high surface quality hot rolled steel plate used for manufacturing a swing arm of an excavator, and a manufacturing method thereof. The high surface quality hot rolled steel plate comprises the following chemical components in percentage by weight: 0.01-0.25 percent of C, 0.05-0.20 percent of Si, 0.10-2.0 percent of Mn, 0.005-0.10 percent of Nb, 0.005-0.20 percent of V, 0.01-0.15 percent of Ti, 0.020-0.070 percent of Als, 0.025 or less than 0.025 percent of P, 0.015 or more than 0.015 percent of S, and the balance of Fe and impurities. The high surface quality hot rolled steel plate is prepared through blast-furnace melt, preliminary desulphuzation of hot metal, converter steel making, LF and RH refining (feed an Si-Ca cable), slab continuous casting, slow cooling of casting blank, slab heating, hot continuous rolling, laminar cooling, rolling, unrolling, 7-roller coarse rectifying and 11-roller fine rectifying, and transverse cutting. The steel plate used for manufacturing the swing arm of the excavator has the yield strength Rel of 280-450MPa, the tensile strength Rm is equal to or greater than 420 MPa, the ductility A is equal to or greater than 25 percent, and the charpy impact absorbing energy KV2 of a transverse test sample is equal to or greater than 50J. The high surface quality hot rolled steel plate has a relatively high intensity, is excellent in weldability, and can completely meet performance requirements of excavating machinery manufacturers all over the world.

Description

technical field [0001] The invention relates to the field of steel manufacturing for engineering machinery, in particular to a hot-rolled steel plate with high surface quality for manufacturing excavator arms and a manufacturing method thereof. Background technique [0002] Large and medium-sized excavator booms have strict internal quality requirements for steel plates because they involve the use safety of the excavator itself. It is generally required that the base metal of the steel plate and the welded joint have high strength and good bending resistance at the same time. At the same time, defects such as pits, pits, and embossing on the surface of the steel plate not only directly affect the appearance of the steel plate, but also have a certain impact on the painting effect of downstream terminal products. With the increasingly fierce competition in the construction machinery industry, major construction machinery parts at home and abroad Component manufacturers have...

AI Technical Summary

Problems solved by technology

This method mainly reduces the amount of scale on the surface of the steel plate as much as possible by controlling the rolling process, without considering the impact of production rhythm on the formation of scale on the surface of the steel plate

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