Forging Control Method for Uniformly Refining the Grain Size of Forgings

Abstract

The invention relates to a forging control method for uniformly refining the grain size of forgings. For the forging process of large forgings, a special forging control and furnace heating method are adopted to make the temperature of the surface and core of the forging tend to be consistent, so that the structure of the core of the forging is completely Transformation, to achieve uniform refinement of the internal structure of large forgings, adopt high temperature heating before forging, after the first fire upsetting and elongation forging, air cool the forgings to a certain temperature, so that the temperature of the inner and outer surfaces of the forgings tends to be consistent, and then return to the high temperature furnace for heating; After the second fire upsetting and drawing, the forging is air-cooled to a certain temperature, and after the temperature of the inner and outer surfaces of the forging tends to be consistent, it is heated in a low-temperature furnace; Without increasing production costs, the internal structure of large forgings is evenly refined, which solves the problem of coarse grains and mixed crystals in large forgings, greatly reduces production costs and shortens the production cycle. Forgings have high mechanical properties and long service life. Production The process is more economical and scientific.

Description

technical field

[0001] The invention belongs to the field of iron and steel material manufacturing process control, in particular to a forging control method for uniformly refining the grain size of forgings. Background technique

[0002] The forging of large forgings usually requires upsetting, elongation, and multi-fire forging. After each fire forging, the core temperature of large forgings is still high, and the billet is directly returned to the high-temperature furnace for heating, resulting in long-term high temperature in the core. state, the internal structure cannot be fully transformed, so the core structure of the forging is coarse, and the whole forging is coarse grained and mixed grained.

[0003] At present, the problem of coarse grains and mixed grains has always been a major problem in the production of large forgings, especially for CrNi2MoV, CrNi3MoV, CrNi4MoV steels, this problem is more prominent. Coarse and uneven grain size not only affects the ultras...

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