High strength and toughness Q460E structural steel thick plate and production method thereof

Abstract

The invention discloses a high strength and toughness Q460E structural steel thick plate. The thick plate comprises the following chemical components by weight percent: 0.10-0.17% of C, 0.20-0.45% of Si, 1.30-1.65% of Mn, 0.018% or less of P, 0.007% or less of S, 0.015-0.050% of Als, 0.025-0.060% of Nb, 0.055-0.070% of V, 0.015-0.025% of Ti and the balance Fe and residual elements. The carbon equivalent [Ceq = C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15] is no more than 0.48. The production method comprises the following technologies: KR molten iron pretreatment, converter smelting, argon-blowing treatment, ladle furnace (LF) refining, vapor deposition (VD) refining, die casting, heating, controlled rolling and controlled cooling and stack cooling. On the basis of ensuring the original components of the high strength and toughness Q460E structural steel, the contents and ratio of the alloy elements in the Q460E steel, namely C, Mn and Nb are adjusted properly; the content of harmful elements in thesteel such as P and S which can influence the plasticity and toughness of the steel plate can be strictly controlled; the heating cycle of steel rolling is strictly controlled; and the rolling process adopts the ways of reducing the finish rolling temperature, increasing the cooling rate after rolling and perform stacking and slow cooling to the steel plate after rolling, thus each performance index of the steel plate meet the standard requirement.

Description

technical field [0001] The invention belongs to the technical field of production of medium-thick steel plates, and in particular relates to a high-strength toughness structural steel Q460E thick plate and a production method thereof. Background technique [0002] In the known technology, traditional Q460E thick plate production requires heat treatment, which increases production energy consumption and production cost, which is very unfavorable to enterprise development and competition. Contents of the invention [0003] In view of the above problems, the present invention provides a high-strength toughness structural steel Q460E thick plate with low cost and easy production and a production method thereof. [0004] A high-strength toughness structural steel Q460E thick plate, comprising the following chemical composition in mass percentage (unit, wt%): C: 0.10-0.17, Si: 0.20-0.45, Mn: 1.30-1.65, P≤0.018, S≤0.007, Als: 0.015-0.050, Nb: 0.025-0.060, V: 0.055-0.070, Ti: 0.0...

AI Technical Summary

Problems solved by technology

[0002] In the known technology, traditional Q460E thick plate production requires heat treatment, which increases production energy consumption and production cost, which is very unfavorable to enterprise development and competition

Images