A kind of ultra-high temperature soft core forging method of steel ingot

Abstract

Provided is a forging method for ultra-high temperature soft core of a steel ingot, comprising firstly subjecting a cast steel ingot with a liquid core to ultra-high temperature demoulding; then placing same in a temperature-holding car to a uniform temperature and conveying to a forging press, subjecting the steel ingot with the liquid core to high-temperature and pressure-maintaining forging to fully crush dendrites at the solidification end, which forms a large amount of equiaxial crystal structures, eliminates the shrinkage porosity and looseness, and alleviates the dendritic crystal segregation; finally, performing a conventional forging to fully refine the crystalline grains and structures. The above-mentioned method breaks through conventional methods for forging mould cast steel ingots only after full solidification. The ultra-high temperature demoulding of a steel ingot with a liquid core, creates semi-solid state structure with excellent fluidity in the core of the steel ingot and a large temperature difference between the surface and the core, and after combination with a subsequent heavy pressurization and pressure-maintaining method, a forced feeding and pressure solidification can be achieved, which not only solves problems of shrinkage porosities, looseness, segregation etc., in the centre of the steel ingot to improve the metallurgical quality, but also reduces the riser weight and the heating number for forging, and prolongs the mould service life.

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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