Production method of medium-low carbon high-strength steel homogenized casting blank

Abstract

The invention relates to a production method of a medium-low carbon high-strength steel homogenized casting blank. The invention adopts the technical scheme as follows: the production method comprises the following step: feeding a cold steel belt into medium-low carbon high-strength molten steel inside a continuous casting machine crystallizer or an ingot mold, wherein the cold steel belt accounts for 0.3-1.0% of the medium-low carbon high-strength molten steel by weight; the cold steel belt feeding speed Vband is equal to A*Vcasting*(Ttundish-Tliqudus) / Tliquidus; the vibration frequency of a belt feeder is 50-35000 Hz; the cold steel belt comprises 0.2-0.65% of C or 1-3% of silicon by weight; the melting point of the cold steel belt is 3-30 DEG C lower than that of the cast casting blank; the surface of the cold steel belt is coated with anti-rusting oil; the thickness of the cold steel belt is 1-6 mm. The production method disclosed by the invention is simple in process, low in cost and convenient to operate; the macrostructure of the produced medium-low carbon high-strength steel homogenized casting blank is obviously improved, the axial / center segregation and internal cracks caused by chemical elements are obviously weakened or eliminated, the ductility and the toughness of the rolled steel plate are improved, the HIC detection qualification rate of the engineering structure steel and the corrosion-resisting steel is increased.

Description

technical field [0001] The invention belongs to the technical field of casting. In particular, it relates to a method for producing a homogeneous cast slab of medium-low carbon high-strength steel. Background technique [0002] Mold and ingot mold are very critical "heart" parts in casting. The solidification process of molten steel in mold and ingot mold has a decisive impact on the surface quality and internal quality of the billet. Axial / central segregation of cast slabs and blooms has a significant effect on the quality of the finished steel. The ever-increasing demand for high-quality steel makes technicians face the problem of how to reduce the axial / central segregation of continuous casting billets and blooms, and produce high-quality continuous casting billets and blooms that meet high requirements. Continuous casting billets are formed under highly extended liquid phase conditions up to tens of meters, which can seriously affect the development of structural and c...

AI Technical Summary

Problems solved by technology

[0004] Compared with the traditional die casting process, the continuous casting process is a major technological advancement, but inherent product defects such as low equiaxed grain rate, center segregation, center looseness and center cracks restrict the quality of continuous casting products

For example, "A Control Method for Light Reduction Position of Slab Continuous Casting" (CN200510028601.4) and "Electromagnetic Stirring Technology for Horizontal Continuous Casting" (CN200510032537.7) can partially Improve slab quality, but these measures require large investment, high requirements for stable operation of steelmaking and continuous casting, complex control models and many influencing factors

At the same time, because the above two technologies are greatly affected by the chemical composition of the steel grade and its mass percentage (wt%) and process parameters (molten steel temperature, casting speed, cooling water and continuous casting machine state, etc.), the uniformity of the billet structure difficult to control