Method for improving hot-working performance of Mn18Cr18N steel

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

Active Publication Date: 2016-05-25
NORTHEASTERN UNIV
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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

Method used

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  • Method for improving hot-working performance of Mn18Cr18N steel
  • Method for improving hot-working performance of Mn18Cr18N steel
  • Method for improving hot-working performance of Mn18Cr18N steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

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

[0043] Step 1, ingredients:

[0044] According to the mass ratio, electroslag remelting pre-melted slag: rare earth oxide = 4:1, mix evenly, prepare the electroslag remelted rare earth slag, and then dry; the rare earth oxide is Ce 2 O 3 ; The drying process is: at 650 ℃, heat preservation for 8 hours, slowly cooling with the furnace;

[0045] Step 2. Preparation stage for electroslag remelting:

[0046] (1) In the electroslag furnace, place the consumable electrode, the mold and the arc starting agent; among them, the consumable electrode is made of Mn18Cr18N steel;

[0047] (2) Use a nitrogen protection device to pass into the crystallizer to remove the air in the crystallizer. The flow rate of nitrogen is 15L / min;

[0048] (3) Weigh the mass of electroslag remelted rare earth slag to 8kg, and configure it according to empirical formula (I):

[0049] (4) Weigh the mass ...

Example Embodiment

[0055] Example 2

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

[0057] Step 1, ingredients:

[0058] According to the mass ratio, electroslag remelting pre-melted slag: rare earth oxide = 4:1, mix evenly, prepare the electroslag remelted rare earth slag, and then dry; the rare earth oxide is Ce 2 O 3 ; The drying process is: at 750 ℃, heat preservation for 3 hours, slowly cooling with the furnace;

[0059] Step 2. Preparation stage for electroslag remelting:

[0060] (1) In the electroslag furnace, place the consumable electrode, the mold and the arc starting agent; among them, the consumable electrode is made of Mn18Cr18N steel;

[0061] (2) Use a nitrogen protection device to pass into the crystallizer to remove the air in the crystallizer, where the nitrogen flow rate is 10L / min;

[0062] (3) Weigh the mass of electroslag remelted rare earth slag to 8kg, and configure it according to empirical formula (I):

[0063] (4) Weigh the ma...

Example Embodiment

[0069] Example 3

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

[0071] Step 1, ingredients:

[0072] According to the mass ratio, electroslag remelting pre-melted slag: rare earth oxide=3:1, mix uniformly, prepare 8kg of electroslag remelted rare earth slag, and dry; the rare earth oxide is La 2 O 3 ; The drying process is: at 700 ℃, heat preservation for 4 hours, slowly cooling with the furnace;

[0073] Step 2. Preparation stage for electroslag remelting:

[0074] (1) In the electroslag furnace, place the consumable electrode, the mold and the arc starting agent; among them, the consumable electrode is made of Mn18Cr18N steel;

[0075] (2) Use a nitrogen protection device to pass into the crystallizer to remove the air in the crystallizer, where the nitrogen flow rate is 10L / min;

[0076] (3) Weigh the mass of electroslag remelted rare earth slag to 6kg, and configure it according to empirical formula (I):

[0077] (4) Weigh the mas...

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Abstract

The invention discloses a method for improving hot-working performance of Mn18Cr18N steel and belongs to the technical field of metallurgy. The method specifically includes the steps that firstly, materials are matched, wherein after electroslag remelting pre-melted slag and rare earth oxide are evenly mixed according to the mass ratio of (2-5):1, drying is performed; secondly, in the electroslag remelting preparation stage, nitrogen is introduced, and raw materials are weighed; thirdly, electroslag remelting is performed; fourthly, in the stage that electroslag remelting ends, the rare earth oxide in electroslag remelting rare earth slag is reduced into rare earth elementary substances through a reduction agent and enters molten steel through the diffusion effect, rare earth reacts with sulfur in steel so that rare earth sulfide can be generated, the content of the sulfur element in the steel is reduced, segregation of the sulfur element in the steel can be eliminated, the hot shortness of the steel is relieved, fine sphere shapes are formed due to the morphology of doping of the rare earth sulfide and doping of rare earth oxygen sulfide, and the mechanical property of the Mn18Cr18N steel can be improved.

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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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
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