Method for forging superhigh-temperature soft core of steel ingot

Abstract

The invention relates to the field of steel forging, in particular to a method for forging a superhigh-temperature soft core of a die cast steel ingot. The method comprises the steps that first, the poured steel ingot with a liquid core is subjected to superhigh-temperature die stripping; second, the poured steel ingot with the liquid core is placed in a thermos van for temperature equilibrium and then is conveyed to a forging press, the steel ingot with the liquid core is subjected to high-temperature pressure maintaining forging, solidified tail end branch crystals are fully broken, a large quantity of equiaxed crystal structures are formed, shrinkage cavities and porosity are eliminated, and dendritic segregation is lightened; and at last, general forging is conducted, and crystalline grains and structures are fully refined. The method breaks through the conventional method that the die cast steel ingot is forged after being completely solidified; a semi-solid structure with excellent liquidity on the core part of the steel ingot and the huge temperature difference between the surface and the core part are created through superhigh-temperature die stripping of the steel ingot with the liquid core; combined with a subsequent heavy pressure and pressure maintaining method, forced feeding and pressure solidification can be achieved; the problems of shrinkage cavities, porosity, segregation and the like of the center of the steel ingot are solved, and the metallurgical quality is improved; the riser weight is lowered, the heating number of forging is decreased, and the service life of a die is prolonged.

Description

technical field [0001] The invention relates to the field of steel forging, in particular to an ultra-high temperature soft core forging method for die-cast steel ingots. Background technique [0002] Large-scale forgings, as the core components of large-scale complete sets of equipment in the fields of metallurgical machinery, petrochemical, transportation, energy and electric power, etc., play an extremely important role in national economic construction, national defense equipment and major scientific devices. Its production capacity and quality level are It is an important symbol to measure a country's independent ability and national strength. Therefore, it is of great significance to improve the internal quality of large forgings and ensure their safety and reliability during operation. [0003] Large forgings are generally forged from large steel ingots. Inside the steel ingot, due to the solidification and shrinkage of the metal, a large number of micro-shrinkage c...

AI Technical Summary

Problems solved by technology

The light reduction technology of continuous casting slabs can improve the center quality of ordinary carbon steel and low alloy steel slabs to a certain extent, but it cannot do anything for alloy steels that must be produced by die casting

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