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...

Examples

Embodiment 1

[0022] A process for forging plates from heavy steel ingots, comprising the following steps:

[0023] S1: Insulation heating, heating ton-level steel ingots in a heating furnace, the temperature of the heating furnace is 1200°C, and heat preservation and heating for 14h~16h;

[0024] S2: rough forging, the steel ingot after high temperature diffusion in S1 is rough forged, and the deformation of the steel ingot is 45%, the rough forging forging ratio is 2, after the completion, return to the furnace for heating, and the furnace temperature is 1190°C;

[0025] S3: Forging and drawing the slab, forging and drawing the slab after returning the steel ingot to the furnace for heating in S2, the deformation of the steel ingot is 25%, and then returning the steel ingot to the furnace for heating, and the furnace temperature is 1150°C;

[0026] S4: Secondary forging and drawing, the steel ingot in S3 is returned to the furnace and heated to forge and draw the slab again, the deformati...

Embodiment 2

[0030] A process for forging plates from heavy steel ingots, comprising the following steps:

[0031] S1: Insulation heating, heating ton-level steel ingots in a heating furnace, the temperature of the heating furnace is 1250 ° C, and heat preservation and heating for 16 hours;

[0032] S2: rough forging, the steel ingot after high temperature diffusion in S1 is rough forged, and the deformation of the steel ingot is 45%, the rough forging forging ratio is 2, after the completion, return to the furnace for heating, and the furnace temperature is 1210°C;

[0033] S3: Forging and drawing the slab, forging and drawing the slab after returning the steel ingot to the furnace for heating in S2, the deformation of the steel ingot is 25%, and then returning the steel ingot to the furnace for heating, and the furnace temperature is 1170°C;

[0034] S4: Secondary forging and drawing, the steel ingot in S3 is returned to the furnace and heated to forge and draw the slab again, the deform...

Embodiment 3

[0038] A process for forging plates from heavy steel ingots, comprising the following steps:

[0039] S1: heat preservation and heating, heat the steel ingot of ton level in the heating furnace, the temperature of the heating furnace is 1220 ℃, and heat preservation and heating for 15 hours;

[0040] S2: rough forging, the steel ingot after high temperature diffusion in S1 is rough forged, and the deformation of the steel ingot is 50%, the rough forging forging ratio is 2, after the completion, return to the furnace for heating, and the furnace temperature is 1200°C;

[0041] S3: forging and drawing the slab, forging and drawing the steel ingot after being heated in the furnace in S2, the deformation of the steel ingot is 30%, and then returning the steel ingot to the furnace for heating, and the furnace temperature is 1160°C;

[0042] S4: Secondary forging and drawing, the steel ingot in S3 is returned to the furnace and heated to forge and draw the slab again, the deformatio...

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...

Examples

Embodiment 1

[0022] A process for forging plates from heavy steel ingots, comprising the following steps:

[0023] S1: Insulation heating, heating ton-level steel ingots in a heating furnace, the temperature of the heating furnace is 1200°C, and heat preservation and heating for 14h~16h;

[0024] S2: rough forging, the steel ingot after high temperature diffusion in S1 is rough forged, and the deformation of the steel ingot is 45%, the rough forging forging ratio is 2, after the completion, return to the furnace for heating, and the furnace temperature is 1190°C;

[0025] S3: Forging and drawing the slab, forging and drawing the slab after returning the steel ingot to the furnace for heating in S2, the deformation of the steel ingot is 25%, and then returning the steel ingot to the furnace for heating, and the furnace temperature is 1150°C;

[0026] S4: Secondary forging and drawing, the steel ingot in S3 is returned to the furnace and heated to forge and draw the slab again, the deformati...

Embodiment 2

[0030] A process for forging plates from heavy steel ingots, comprising the following steps:

[0031] S1: Insulation heating, heating ton-level steel ingots in a heating furnace, the temperature of the heating furnace is 1250 ° C, and heat preservation and heating for 16 hours;

[0032] S2: rough forging, the steel ingot after high temperature diffusion in S1 is rough forged, and the deformation of the steel ingot is 45%, the rough forging forging ratio is 2, after the completion, return to the furnace for heating, and the furnace temperature is 1210°C;

[0033] S3: Forging and drawing the slab, forging and drawing the slab after returning the steel ingot to the furnace for heating in S2, the deformation of the steel ingot is 25%, and then returning the steel ingot to the furnace for heating, and the furnace temperature is 1170°C;

[0034] S4: Secondary forging and drawing, the steel ingot in S3 is returned to the furnace and heated to forge and draw the slab again, the deform...

Embodiment 3

[0038] A process for forging plates from heavy steel ingots, comprising the following steps:

[0039] S1: heat preservation and heating, heat the steel ingot of ton level in the heating furnace, the temperature of the heating furnace is 1220 ℃, and heat preservation and heating for 15 hours;

[0040] S2: rough forging, the steel ingot after high temperature diffusion in S1 is rough forged, and the deformation of the steel ingot is 50%, the rough forging forging ratio is 2, after the completion, return to the furnace for heating, and the furnace temperature is 1200°C;

[0041] S3: forging and drawing the slab, forging and drawing the steel ingot after being heated in the furnace in S2, the deformation of the steel ingot is 30%, and then returning the steel ingot to the furnace for heating, and the furnace temperature is 1160°C;

[0042] S4: Secondary forging and drawing, the steel ingot in S3 is returned to the furnace and heated to forge and draw the slab again, the deformatio...