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A method to improve the hot working performance of mn18cr18n steel

A mn18cr18n, thermal processing technology, applied in the field of metallurgy, can solve problems such as easy cracks, achieve the effect of reducing content, reducing hot embrittlement, and eliminating segregation

Active Publication Date: 2017-12-01
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that Mn18Cr18N retaining ring steel is prone to cracks when chamfering and upsetting on a hydraulic press, the invention provides a method for improving the hot working performance of Mn18Cr18N steel

Method used

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  • A method to improve the hot working performance of mn18cr18n steel
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  • A method to improve the hot working performance of mn18cr18n steel

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Effect test

Embodiment 1

[0042] A method for improving hot workability of Mn18Cr18N steel, comprising the following steps:

[0043] Step 1, Ingredients:

[0044] According to the mass ratio, electroslag remelting pre-melting slag: rare earth oxide = 4:1, mix evenly, prepare electroslag remelting rare earth slag, dry; rare earth oxide is Ce 2 o 3 ; The drying process is: at 650 ° C, heat preservation for 8 hours, and slowly cool down with the furnace;

[0045] Step 2, preparation stage for electroslag remelting:

[0046] (1) In the electroslag furnace, place the consumable electrode, crystallizer and arc ignition agent; wherein, the material of the consumable electrode is Mn18Cr18N steel;

[0047] (2) adopt nitrogen protective device, feed in the crystallizer, remove the air in the crystallizer, wherein, the flow rate of nitrogen is 15L / min;

[0048] (3) The quality of electroslag remelting rare earth slag is weighed to be 8kg, and it is configured according to empirical formula (I):

[0049] (4) ...

Embodiment 2

[0056] A method for improving hot workability of Mn18Cr18N steel, comprising the following steps:

[0057] Step 1, Ingredients:

[0058] According to the mass ratio, electroslag remelting pre-melting slag: rare earth oxide = 4:1, mix evenly, prepare electroslag remelting rare earth slag, dry; rare earth oxide is Ce 2 o 3 ; The drying process is: at 750 ° C, heat preservation for 3 hours, and slowly cool down with the furnace;

[0059] Step 2, preparation stage for electroslag remelting:

[0060] (1) In the electroslag furnace, place the consumable electrode, crystallizer and arc ignition agent; wherein, the material of the consumable electrode is Mn18Cr18N steel;

[0061] (2) adopt nitrogen protective device, feed in the crystallizer, remove the air in the crystallizer, wherein, the flow rate of nitrogen is 10L / min;

[0062] (3) The quality of electroslag remelting rare earth slag is weighed to be 8kg, and it is configured according to empirical formula (I):

[0063] (4) ...

Embodiment 3

[0070] A method for improving hot workability of Mn18Cr18N steel, comprising the following steps:

[0071] Step 1, Ingredients:

[0072] According to the mass ratio, electroslag remelting pre-melting slag: rare earth oxide = 3:1, mix evenly, prepare 8kg of electroslag remelting rare earth slag, and dry; the rare earth oxide is La 2 o 3 ; The drying process is: at 700 ° C, keep warm for 4 hours, and slowly cool with the furnace;

[0073] Step 2, preparation stage for electroslag remelting:

[0074] (1) In the electroslag furnace, place the consumable electrode, crystallizer and arc ignition agent; wherein, the material of the consumable electrode is Mn18Cr18N steel;

[0075] (2) adopt nitrogen protective device, feed in the crystallizer, remove the air in the crystallizer, wherein, the flow rate of nitrogen is 10L / min;

[0076] (3) The quality of electroslag remelting rare earth slag is weighed to be 6kg, and it is configured according to empirical formula (I):

[0077] (4...

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Abstract

A method for improving the hot processing performance of Mn18Cr18N steel belongs to the field of metallurgical technology and specifically includes the following steps: (1) Ingredients: According to the mass ratio, electroslag remelting pre-melted slag: rare earth oxide = (2~5): 1, After mixing evenly, dry; (2) Preparation stage for electroslag remelting: pass in nitrogen and weigh the raw materials; (3) Electroslag remelting; (4) End stage of electroslag remelting; use reducing agent to remelt the electroslag. The rare earth oxides in the molten rare earth slag are reduced to rare earth elements and enter the molten steel through diffusion. The rare earth reacts with the sulfur in the steel to form rare earth sulfide, which reduces the sulfur content in the steel and eliminates the sulfur content in the steel. Segregation reduces the "hot brittleness" of steel, and the rare earth sulfide inclusions and rare earth oxysulfide inclusions are shaped into fine spherical shapes, which can improve the mechanical properties of Mn18Cr18N steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for improving the thermal processing performance of Mn18Cr18N steel. Background technique [0002] Mn18Cr18N high-nitrogen austenitic stainless steel is used as a retaining ring steel for the rotor of a turbogenerator because of its non-magnetic properties, high plasticity, toughness and good stress corrosion resistance. However, Mn18Cr18N has a narrow forgeable temperature range and high high-temperature deformation resistance. It is often easy to produce cracks when chamfering and upsetting on a hydraulic press, which seriously affects the yield of the production of retaining ring steel and causes a serious waste of resources. Therefore, on the premise of maintaining other excellent properties of Mn18Cr18N, improving the plasticity and toughness of Mn18Cr18N high-nitrogen austenitic stainless steel is of great significance for improving the yield of retaining ring s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 董艳伍姜周华曹海波曹玉龙侯栋徐光王进鹏汪祥程中堂李传峥封乾隆
Owner NORTHEASTERN UNIV LIAONING
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