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Fe-Mn austenite non-magnetic steel forging method

An austenitic, non-magnetic steel technology, applied in the field of Fe-Mn series austenitic non-magnetic steel forging, can solve problems such as shortening forging time, and achieve shortened forging time, reduced temperature difference, temperature and microstructure uniformity improved effect

Active Publication Date: 2016-10-26
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This forging method not only solves the defects such as edge cracks and corner cracks that may occur during the forging process, but also shortens the forging time and effectively improves the forging efficiency

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Optional Fe-Mn series austenitic non-magnetic steel, its chemical composition includes C: 3.2%, Si: 0.42%, Mn: 20%, P: 0.010%, S: 0.003%, Al: 1.8%, Nb: 0.015 %, V: 0.014%, the balance is Fe. The billet is an octagonal ingot, the size of the tail of the ingot mold is 680mm, the size of the head of the fixed mold is 750mm, the size of the lower part of the riser is 660mm, the size of the upper part of the riser is 660mm, the length of the ingot body is 1600mm, the length of the ingot tail is 170mm, the height of the riser is 270mm, and the total length of the ingot is 2050mm. Weighing about 6t, the cross-sectional size required for forging is 210×1100mm. Its forging method includes heating process and pressing process:

[0037] (1) During the heating process, the cast slab steel ingot is delivered hot, and the surface temperature of the hot delivered steel ingot is 385°C; when heating, it is put into the furnace at a low temperature, and the temperature in the preheating...

Embodiment 2

[0040] Optional Fe-Mn series austenitic non-magnetic steel, its chemical composition includes C: 3.0%, Si: 0.48%, Mn: 18.4%, P: 0.008%, S: 0.002%, Al: 2.2%, Nb: 0.015 %, V: 0.015%, the balance is Fe. The billet is a square ingot, the size of the tail of the ingot mold is 430mm, the size of the head of the ingot mold is 565mm, the size of the lower part of the riser is 535mm, the size of the upper part of the riser is 535mm, the length of the ingot body is 1300mm, the height of the riser is 160mm, the total length of the ingot is 1500mm, and the weight is about 3t. The cross-sectional dimension of the forging is 150×150mm. Its forging method includes heating process and pressing process:

[0041] (1) During the heating process, the cast slab steel ingot is delivered hot, and the surface temperature of the hot delivered steel ingot is 380°C; when heating, it is put into the furnace at a low temperature, and the temperature in the preheating section is 500°C. After holding for 0...

Embodiment 3

[0044] Optional Fe-Mn series austenitic non-magnetic steel, its chemical composition includes C: 4.0%, Si: 0.5%, Mn: 23%, P: 0.01%, S: 0.002%, Al: 1.2%, Nb: 0.01 %, V: 0.02%, the balance is Fe. The billet is a square ingot, the size of the tail of the ingot mold is 430mm, the size of the head of the ingot mold is 565mm, the size of the lower part of the riser is 535mm, the size of the upper part of the riser is 535mm, the length of the ingot body is 1300mm, the height of the riser is 160mm, the total length of the ingot is 1500mm, and the weight is about 3t. The cross-sectional dimension of the forging is 150×150mm. Its forging method includes heating process and pressing process:

[0045] (1) During the heating process, the cast slab steel ingot is delivered hot, and the surface temperature of the hot delivered steel ingot is 350°C; when heating, it is put into the furnace at a low temperature, and the temperature in the preheating section is 450°C. After holding for 0.5h, i...

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Abstract

The invention discloses a Fe-Mn austenite non-magnetic steel forging method, and belongs to the technical field of forging. The forging method comprises a heating process and a screw down process, wherein the heating process is characterized in that casting blank steel ingots are delivered to a soaking furnace in a hot manner, the surface temperature of the casting blank steel ingots is greater than 330 DEG C, the temperature in a preheating stage is controlled to be 400-550 DEG C and is kept for 0.2-0.7 h when heating is carried out, and heating is carried out in three stages; and the screw down process is characterized in that the blanks are forged to preheat a device before casting blank steel ingots are forged to make the surface temperature of flat anvils be greater than 250 DEG C, a layer of asbestos is paved on the surface of the casting blank steel ingots after the casting blank steel ingots are discharged from the furnace, forging is rapidly carried out, the initial forging temperature is greater than 1100 DEG C, and the finish forging temperature is greater than 900 DEG C. Compared with present forging technologies, the method disclosed in the invention has the advantages of reduction of the temperature difference between the surface and the core, basically consistent grain size, substantial improvement of the temperature and the microstructure uniformity, no cracks in the forging process, shortening of the crack cleaning time, forging time shortening, and effective increase of the forging efficiency.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a forging method of Fe-Mn series austenitic non-magnetic steel. Background technique [0002] As a functional steel material, non-magnetic steel is a non-magnetic steel material that basically does not produce magnetic induction under the action of a magnetic field. Its room temperature structure is required to be stable austenite, because ferrite, pearlite and martensite are ferromagnetic at room temperature, and have high magnetic permeability, while austenite with a face-centered cubic structure is cis Magnetism, magnetic permeability is very low, by adding appropriate alloying elements to expand the austenite region of the Fe-C phase diagram and heat treatment methods, a stable single-phase austenite structure can be obtained at room temperature. According to the performance, non-magnetic steel can be divided into austenitic non-magnetic stainless steel and non-m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/70B21J1/06B21J5/00C22C38/12C22C38/06C22C38/04C22C38/02
CPCB21J1/06B21J5/002C21D9/70C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 何亚元严翔付勇涛郭斌周千学杨治争尹云洋朱丛茂官计生蔡珍
Owner 武汉钢铁有限公司
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