Method for medium sized or thin plate blank continuous casting and continuous rolling for producing superfine crystal grain steel plate and the steel plate

Abstract

The invention discloses a manufacturing method of hyperfine crystal steel board through continuous rolling thin board, which comprises the following steps: allocating raw material with 0.12-0.18% C, 0.15- 0.35% Si, 0.65-1. 20% Mn, not more than 0.02% P, not more than 0.015% S and Fe; casting in the 100-200mm*1000-2000mm blank; setting the loading temperature over 800 deg. c; heating to 1100-1280 deg. c; reducing rough rolling of blank to 30-60 mm; setting refining rolling temperature between 920 and 1050 deg. c; exerting multi-channel and large-deforming strain accumulation with even deforming velocity at 1-10 / s; setting the refining rolling outlet temperature at 750-900 deg. c; setting cooling speed of laminar flow at 10-45 deg. c / s; coiling at 400-620 deg. c; setting the norm of continuous heat rolling steel at 2-18mm with even crystal size at 3-7um and yielding strength over 400Mpa; making the extending proof strength between 510 and 580 Mpa and extending rate over 26%.

Description

Technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a hot-rolled steel sheet and a production method thereof, in particular to a hot-rolled steel sheet with ultra-fine grains on a short-process hot-rolled wide-band steel production line for continuous casting and rolling of medium and thin slabs And its production methods. Background technique [0002] Ultra-fine grain processing is an economical and effective means to improve the physical and mechanical properties of steel materials. It can increase the strength of the material while reducing the ductile-brittle transition temperature of the material. At present, based on the simple C-Mn system, the grains of steel materials are obviously refined through effective technological means, and the performance is significantly improved, so that the final product can achieve ultra-thin weight reduction and prolonged life. It has become an international research on steel materials. One of...

AI Technical Summary

Problems solved by technology

As we all know, the production process of ultra-fine grain steel is characterized by rolling at low temperature and large deformation (a certain billet thickness is required) and rapid cooling after rolling. It is difficult to produce ultra-fine grain steel (thickness 2-18mm, width 1000-2000mm) on the rolling wide-band steel production line.

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