Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery

Abstract

The invention discloses a method for improving performance uniformity of a steel roll of Ti microalloyed high strength machinery, which comprises the following steps: refining and heating molten steel with Ti addition amount of 0.07-0.14% and roughing the molten steel to obtain an intermediate billet; heating the edge of the intermediate billet and then finish rolling to obtain a hot rolled plate; cooling the hot rolled plate in a U-shape and rolling into a hot roll; and straightening the hot roll and obtaining the product. According to the method for improving performance uniformity of a steel roll of Ti microalloyed high strength machinery, the performance uniformity of the final product in the rolling direction is improved in the U-shaped cooling model in the cooling process, and the comprehensive yield is improved. With the adoption of edge inductive heating of the intermediate billet, the performance uniformity of the final product in the horizontal direction is improved, and the safety of the material in the using process is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel material production, in particular to a method for improving the uniformity of the coil performance of Ti microalloyed high-strength mechanical steel. Background technique [0002] High-strength mechanical steel with a yield strength of 460MPa~700MPa has been widely used in the manufacture of truck cranes, concrete pump arms and other large-scale mechanical equipment. Ti, relying on the precipitation strengthening effect of TiC to greatly improve the strength level of the material. [0003] The Chinese patent with publication number 101538680 introduces a production method for producing 600MPa grade high-strength steel based on thin slab continuous casting and rolling production mode, but the patent does not study and explain how to control the uniformity of the material coil. The Chinese patent with patent publication number 101899616A introduces a production method of 600MPa grade high-s...

AI Technical Summary

Problems solved by technology

The Chinese patent with the patent publication number 101899616A introduces a production method of 600MPa grade high-strength steel by hot continuous rolling. It also does not study and explain the performance of the inner and outer rings of the steel coil and the uniformity in the width direction.

The existing technology does not propose effective improvement measures on how to improve the strength performance of the innermost ring and outermost ring of the steel coil

[0006] (2) No attention was paid to the performance fluctuation of high-strength mechanical steel along the width direction of the plate. The strength performance of the two edges of the thin gauge (≤5mm) high-strength mechanical steel along the width direction of the plate generally decreased by 150-300MPa. a great security risk

[0007] By checking the existing technical patents and literature, there is no report on how to improve the uniformity of the mechanical properties of Ti microalloyed high-strength mechanical steel hot-rolled coil products along the rolling direction and transverse direction. This patent is verified according to industrial production practices. A measure to effectively improve the uniformity of Ti microalloyed high-strength steel coil performance is proposed, which significantly improves the yield and avoids potential safety hazards caused by performance fluctuations at different positions of the material during the user's use.

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