Deformation aging performance-guaranteed S355K2-Z35 moderately thick plate and production method thereof

Abstract

The invention discloses a deformation aging performance-guaranteed S355K2-Z35 moderately thick plate. The moderately thick plate comprises the following chemical components: 0.07-0.17 wt% of C, 0.20-0.45 wt% of Si, 1.30-1.55 wt% of Mn, equal to or less than 0.018 wt% of P, equal to or less than 0.007 wt% of S, 0.010-0.050 wt% of AlS, equal to or less than 0.090 wt% of Nb+V+Ti, and the balance Fe and residual elements. A technology comprising Steps of KR molten iron pretreatment, converter smelting, argon blow treatment, LF refining, VD refining, continuous casting, heating, rolling and cooling control, and pile cooling is optimized to appropriately adjust contents of alloy elements of C, Mn, Nb, V, and Ti on the basis of an original component of an S355K2 high obdurability structure steel, and strictly control contents of harmful elements consisting of P, S and the like which influence the ductility and toughness of the steel plate, so a process route for producing clean steel is adopted; the heating system of steel rolling is strictly controlled, two-phase high pressure rolling is carried out in the rolling process, the cooling speed after rolling is improved, and a slow stacking cooling mode of steel plates after rolling is adopted, so the deformation ageing performance and all routine performance indexes of S355K2-Z35 steel are guaranteed to reach standard requirements.

Description

[0001] technical field [0002] The invention belongs to the technical field of medium-thick steel plate production technology, and in particular relates to a S355K2-Z35 medium-thick plate with deformation-preserving and aging properties and a production method thereof. Background technique [0003] With the increasingly stringent requirements of the market for the quality grade of steel plates, S355K2-Z35 medium and thick plates with deformation and aging properties cannot be produced due to the difficulty in production and special requirements for process equipment. The production method is very immature and is still in the exploration stage. Contents of the invention [0004] The invention provides a S355K2-Z35 medium-thick plate with deformation and aging performance that meets market demand and is easy to produce and a production method thereof. [0005] A S355K2-Z35 medium-thick plate with deformation-retaining aging performance, comprising the following chemical com...

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Problems solved by technology

[0003] With the increasingly stringent requirements of the market for the quality grade of steel plates, the S355K2-Z35 medium-thick plate with deformation and aging performance cannot be produced because of its difficulty in production and special requirements for process equipment. The production method is very immature and is still in the exploratory stage.

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