Method of producing high undercooling control rolling fine grain high-strength C-Mn steel plate

Abstract

The invention is an undercooling controlled rolling fine grained high strength C-Mn steel plate production method, which relates to a steel plate rolling production process technology. The production technology comprises the steps that the C-Mn steel continuous casting steel billet with 50mm thickness is rolled for 6-pass in CSP production line under the temperature of 1150 DEG C. to 1000 DEG C., and the coarse microstructure of the casting billet is distorted and the microstructure generates recrystallization in deformation Austenite; The invention is capable of getting the higher strength; then, the C-Mn steel tape is cooled by the strong wind of the fan, and the big Austenite deformation is carried out; finally, the C-Mn steel tape is coiled on a roller machine as the finished product. The invention can get the higher strength through the crystallization of the steel with low C-Mn content; the alloy composite is simple and the price is lower; the invention is of good low temperature toughness and good cold bending forming; based on the composite regulation and base principle of application the technology, the invention is capable of getting the steel grade of good formablity of 400MPa level, 500MPa leve and 600MPa level from the C-Mn steel; the invention has the prevalent meaning of guidance to the fine grain high strength board's production.

Description

1. Technical field [0001] The invention relates to a steel plate rolling production technology, in particular to a production method of a deep supercooled controlled rolling fine-grained high-strength C-Mn steel plate 2. Background technology [0002] The existing production process of fine-grained high-strength plate is a multi-stage rolling process: including rolling in the two-phase region and strain-induced ferrite grain refinement. Although this process method can obtain fine austenite grains and high strength. However, mixed crystals are often prone to occur, especially the grains on the surface are severely deformed, and they are cake-shaped or long-strip-shaped. This structure and morphology often have a negative impact on the transverse cold bending of the plate, which will lead to surface micro-cracks. There is no obvious effect on the longitudinal mechanical properties and cold bending, which will seriously affect the cold bending formability and limit the applic...

AI Technical Summary

Problems solved by technology

However, mixed crystals are often prone to occur, especially the grains on the surface are severely deformed, and they are cake-shaped or long-strip-shaped. This structure and morphology often have a negative impact on the transverse cold bending