Hot-rolled multi-phase steel with excellent flangability and production method thereof

Abstract

The invention discloses a hot-rolled multi-phase steel with excellent flangability and production method thereof, belonging to technical field of steelmaking. The hot-rolled multi-phase steel comprises the following chemical components by mass: 0.04 to 0.10% of C, 0.1 to 0.2% of Si, 1.0 to 2.0% of Mn, no more than 0.015% of P, no more than 0.004% of S, no more than 0.04% of Al, no more than 0.0050% of N, 0.1 to 0.4% of Re, any two selected from a group consisting of 0.25 to 0.45% of Cr, 0.1 to 0.4% of Mo and 0.1 to 0.4% of Ni, and any one selected from a group consisting of 0.04 to 0.06% of Nb and a mixture of 0.05 to 0.10% of V and 0.010 to 0.03% of Ti, with the balance being Fe and unavoidable impurities. The interior microscopic structure of the hot-rolled multi-phase steel is granular bainite. The hot-rolled multi-phase steel in the invention has good flangability, surface quality and comprehensive mechanical properties.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a hot-rolled multiphase steel with excellent flanging performance and a production method thereof. Background technique [0002] Hot-rolled multiphase steel is mainly used in the automobile field, and is favored by automobile designers and parts manufacturers for its high strength and high formability. Chinese patent "Method for preparing flat steel products from steel forming complex phase microstructure" (disclosure date: 2009-9-9, publication number: CN101528969A), Chinese patent "Ultra-high-strength hot-rolled composite with good bending and hole expansion properties" Phase steel plate and steel strip and its manufacturing method" (public date: 2015-4-15, public number: CN104513930A), Chinese patent "a hot-rolled multi-phase steel and its production method" (public date: 2013-9-11 , Publication No.: CN103290320 A) The three patents respectively proposed the preparation m...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a hot-rolled multi-phase steel with excellent flanging performance and its production method, which solves the technical problems in the prior art that the hole expansion rate of the multi-phase steel is low, and the red scale on the surface of the steel plate is difficult to remove and affects the surface quality.

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