A process for forging plates from heavy steel ingots

Abstract

The invention discloses a technology for forging heavy steel ingots into plates. The technology includes the steps of heating the ton-grade steel ingots in a heating furnace for 14-16 hours with the temperature preserved; carrying out rough forging and returning the steel ingots in the heating furnace for heating after rough forging is completed; forging and drawing plate blanks and returning the steel ingots in the heating furnace for heating; forging and drawing the plate blanks again to meet the requirements of technological sizes and flattening surfaces, wherein the finish forging temperature is 840 DEG C; and placing forged plates into a thermal treatment furnace, heating the plates to 980 DEG C, carrying out normalization after the temperature is preserved for a period of appropriate time, cooling the plates in air, then placing work-pieces into the furnace, heating the work-pieces to 740 DEG C and carrying out air cooling after heat preserving and tempering. The technology has the beneficial effects that deformation of the steel ingots is easy, metal flowing is fast, high temperature diffusion is added in the heating process for removing intragranular segregation and intragranular micro-cracks, the forging quality of the steel ingots is guaranteed, and the grain sizes of the forged plates are uniform.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a process for forging plates from heavy steel ingots. Background technique [0002] clf-1 steel is the test cladding formwork TBM (Test Blowket Module) ITER national standard cooperation organization plans to use steel for simulating and testing materials related to future fusion reactors during the operation of ITER. The steel has been jointly developed by the Southwest Institute of Physics of the Nuclear Industry and the Shenyang Institute of Metal Research, Chinese Academy of Sciences. At the same time, the smelting process has been initially upgraded from the kg-level to the ton-level process preparation, but the forging of 5-ton steel ingots is still somewhat difficult, mainly in the following areas: 1) The ingot shape increases, the crystallization of the internal structure changes, and the distribution of alloy components The degree of uniformity is reduced, and the compa...

AI Technical Summary

Problems solved by technology

At the same time, the smelting process has been initially upgraded from the kg-level to the ton-level process preparation, but the forging of 5-ton steel ingots is still somewhat difficult, mainly in the following areas: 1) The ingot shape increases, the crystallization of the internal structure changes, and the distribution of alloy components The degree of uniformity is reduced, and the compactness is small and the ingot is poor; for forging deformation, forging temperature, deformation degree, and deformation speed have certain requirements

2) Influenced by the addition of various alloy elements, the recrystallization speed is slow and the deformation resistance is large

Due to the addition of alloying elements, the recrystallization temperature of the material is also increased, and the uneven distribution of carbides reduces the plasticity and increases the risk of cracking

3) Improper degree of deformation affects various properties of the metal and causes serious anisotropy