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Technology for forging heavy steel ingots into plates

A technology for steel ingots and plates, applied in the field of heavy steel ingot forging plate technology, can solve the problems of changes in the crystallization state of the internal structure, slow recrystallization speed, improper deformation degree, etc., to eliminate intragranular microcracks, increase high temperature diffusion, The effect of eliminating intragranular segregation

Active Publication Date: 2017-03-08
YUANFANG HIGH TECH EQUIP PARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this embodiment, the steel ingot is a clf-1 steel ingot with a weight of at least 5 tons, and the average deformation speed of the steel ingot during forging is 0.3 seconds −1 .

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...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/06B21J5/08B21J1/06C21D8/02
CPCB21J1/06B21J5/06B21J5/08C21D8/0221C21D8/0247
Inventor 吉昌学张超杰邓勇
Owner YUANFANG HIGH TECH EQUIP PARTS CO LTD
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