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Production method capable of reducing hot working cracking tendency of Mn18Cr18N retaining ring steel

A production method and thermal processing technology, applied in the direction of metal processing equipment, improvement of process efficiency, improvement of energy efficiency, etc., can solve problems such as high temperature deformation resistance, narrow forgeable temperature range, and influence on yield, and achieve good surface, The effect of high yield and short production cycle

Inactive Publication Date: 2019-12-13
SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the narrow forgeable temperature range of Mn18Cr18N retaining ring steel and high temperature deformation resistance, high nitrogen steel represented by Mn18Cr18N has poor plasticity during hot working, so it is easy to produce cracks during upsetting and ring expansion on the press. Cracks seriously affect the yield of the steel and cause a serious waste of resources

Method used

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  • Production method capable of reducing hot working cracking tendency of Mn18Cr18N retaining ring steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A Mn18Cr18N retaining ring steel forging, its element composition and mass percentage are as follows: C 0.10%, Si0.80%, Mn 17.5%, Cr 17.5%, Ni 2.0%, N 0.45%, V0.25%, Ti 0.10%, Al 0.04%, P0.060%, S 0.015%, Fe balance.

[0029] The production method of above-mentioned Mn18Cr18N retaining ring steel forging is according to the following steps:

[0030] (1) Smelting: use a non-vacuum induction furnace to smelt Mn18Cr18N retaining ring steel, add a rare earth alloy (lanthanum-cerium alloy, the addition amount is 2‰) along with the flow before the steel is cast, and the casting temperature is controlled at 1450 °C;

[0031] (2) Electroslag remelting: The electroslag remelting slag is CaF according to the mass percentage 2 :Al 2 o 3 :MgO:SiO 2 =63%: 7%: 3%: 13% is equipped, the control current is 7500 ± 300A, the voltage is 55 ± 5V, and the electroslag steel ingot is prepared;

[0032] (3) Steel ingot forging: the heating temperature is 1150°C, the starting forging temper...

Embodiment 2

[0035] A Mn18Cr18N retaining ring steel forging, its element composition and mass percentage are as follows: C 0.08%, Si0.60%, Mn 20.0%, Cr 20.0%, Ni 2.0%, N 0.80%, V 0.22%, Ti 0.09%, Al 0.03%, P0.050%, S≤0.010%, Fe balance.

[0036] The production method of above-mentioned Mn18Cr18N retaining ring steel forging is according to the following steps:

[0037] (1) Smelting: use a non-vacuum induction furnace to smelt Mn18Cr18N retaining ring steel, add a rare earth alloy (lanthanum-cerium alloy, the addition amount is 1‰) along with the flow before the steel is cast, and the casting temperature is controlled at 1540 °C;

[0038] (2) Electroslag remelting: The electroslag remelting slag is CaF according to the mass percentage 2 :Al 2 o 3 :MgO:SiO 2 =86%: 7%: 3%: 4% is equipped, the control current is 7500 ± 300A, the voltage is 55 ± 5V, and the steel ingot is prepared;

[0039] (3) Steel ingot forging: the heating temperature is 1250°C, the starting forging temperature is con...

Embodiment 3

[0042]A Mn18Cr18N retaining ring steel forging, its element composition and mass percentage are as follows: C 0.05%, Si0.65%, Mn 18.5%, Cr 19.0%, Ni 1.8%, N 0.55%, V0.20%, Ti 0.06%, Al 0.030%, P0.045%, S 0.010%, Fe balance.

[0043] The production method of above-mentioned Mn18Cr18N retaining ring steel forging is according to the following steps:

[0044] (1) Smelting: use a non-vacuum induction furnace to smelt Mn18Cr18N retaining ring steel, add a rare earth alloy (lanthanum-cerium alloy, the addition amount is 2‰) along with the flow before the steel is cast, and the casting temperature is controlled at 1510 °C;

[0045] (2) Electroslag remelting: The electroslag remelting slag is CaF according to the mass percentage 2 :Al 2 o 3 :MgO:SiO 2 =82%:10%:5%:3%, control current 7500±300A, voltage 55±5V, prepare steel ingot;

[0046] (3) Steel ingot forging: the heating temperature is 1190°C, the starting forging temperature is controlled at 1080°C, and the final forging temp...

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Abstract

The invention discloses a production method capable of reducing hot working cracking tendency of Mn18Cr18N retaining ring steel, and belongs to the technical field of steel preparing. The production method comprises the following steps of firstly, smelting, wherein before tapping pouring, rare earth alloy is added, and the pouring temperature ranges from 1450 to 1540 DEG C; secondly, electroslag remelting, wherein a slag system is provided according to the mass percent of CaF2:Al2O3:MgO:SiO2 being 63 to 86%:7 to 15%:3 to 13%: 3 to 13%, the current is controlled to 7500 + / - 300 A, and voltage is 55+ / - 5V; thirdly, steel ingot forging, wherein the heating temperature is 1150 to 1250 DEG C, the open forging temperature is 1050 to 1100 DEG C, and the final forging temperature is 850 to 950 DEGC; and fourthly, solid solution, wherein the solid solution temperature is 1000 to 1100 DEG C, the heat preservation time is larger than or equal to 2 h, and discharge water cooling is carried out. From the aspects of production cost saving, electric slag steel ingot quality improving and forging process improving of a non-vacuum induction furnace, the hot working cracking tendency of a Mn18Cr18Nforge piece is obviously reduced, production quality stability is improved, and the product yield is up to 92 to 96%.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and in particular relates to a production method for reducing the thermal cracking tendency of Mn18Cr18N retaining ring steel. Background technique [0002] Mn18Cr18N high-nitrogen austenitic stainless steel has a good application market because of its non-magnetism, high strength and good stress corrosion resistance. Mn18Cr18N forgings are one of the key basic components of steam turbine generator sets in thermal power and nuclear power. . In order to ensure the safe operation of the unit for a long time, it must not only have sufficient strength and good mechanical properties, but also have good resistance to strain corrosion. At present, vacuum induction furnace + electroslag remelting + forging are widely used at home and abroad, and the forging is produced by solid solution treatment and cold deformation strengthening process. [0003] Due to the narrow forgeable temperature rang...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22B9/18C22C38/02C22C38/06C22C38/46C22C38/50C22C38/58C21D1/00C21D6/00B21J5/00
CPCB21J5/002C21D1/00C21D6/004C21D6/005C21D6/008C22B9/18C22C33/04C22C38/001C22C38/002C22C38/02C22C38/06C22C38/46C22C38/50C22C38/58Y02P10/25
Inventor 肖磊黄志勇丁勇朱小阳
Owner SICHUAN JIANGYOU LIUHE STEAM TURBINE MATERIAL
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