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A high carbon and high chromium 9cr18 martensitic stainless steel shaft forging preparation process

A martensitic stainless steel and preparation process technology, applied in metal processing equipment and other directions, can solve the problems of reducing the plasticity, toughness and contact fatigue properties of steel, and achieve the effect of shortening solidification segregation and improving carbide segregation

Active Publication Date: 2017-05-10
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The normal structure of the forging after annealing is the distribution of carbides (spheroidal carbides, eutectic carbides) and a small amount of residual austenite on the ferrite matrix. In actual production, the carbides include spheroidal carbides and eutectic carbides. There are also twin carbides, which will greatly reduce the plasticity, toughness and contact fatigue properties of steel

Method used

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  • A high carbon and high chromium 9cr18 martensitic stainless steel shaft forging preparation process
  • A high carbon and high chromium 9cr18 martensitic stainless steel shaft forging preparation process
  • A high carbon and high chromium 9cr18 martensitic stainless steel shaft forging preparation process

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Embodiment 1

[0020] A high carbon and high chromium 9Cr18 martensitic stainless steel shaft forging preparation process, the forging specification is φ430×6300, the process method is as follows:

[0021] Smelting: electric arc furnace smelting + vacuum refining + electroslag remelting, the main chemical composition is controlled as follows: C: 0.90~0.92, Cr: 17.0~17.5, Si: 0.50~0.55, Mn: 0.40~0.45; casting temperature is controlled at 1450 ~1480°C;

[0022] Forging: 10.5 tons of electroslag ingots are used for forging, and the electroslag ingots are hot-sent and heated. The heating temperature is 1140-1180°C, the initial forging temperature is 1000-1120°C, and the final forging temperature is 900-950°C. The equipment used is 5,000 tons Hydraulic press blanking and 1400-ton precision forging machine forming, the deformation method adopts upsetting and drawing length, the total forging ratio is 8.5-9.5, the upsetting coefficient is 2.0-3.0, and the deformation method is: use whole body light...

Embodiment 2

[0025] A high carbon and high chromium 9Cr18 martensitic stainless steel shaft forging preparation process, the forging specification is φ530×5300, the process method is as follows:

[0026] Smelting: electric arc furnace smelting + vacuum refining + electroslag remelting, the main chemical composition is controlled as follows: C: 0.90-0.92, Cr: 17.0-17.5, Si: 0.50-0.55, Mn: 0.40-0.45; casting temperature is controlled at 1450 ~1480°C;

[0027] Forging: 10.5 tons of electroslag ingots are used for forging, and the electroslag ingots are hot-sent and heated. The heating temperature is 1160±10°C, the initial forging temperature is 1000-1120°C, the final forging temperature is 900-950°C, and the equipment used is 5000 The billet is opened by a 1-ton hydraulic press and formed by a 1400-ton precision forging machine. The deformation method adopts upsetting and drawing, the total forging ratio is 8.5-9.5, and the upsetting coefficient is 2.5-3.5. Inverted octagonal - rounded, the ...

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Abstract

The invention relates to a high-carbon and high-chromium 9Cr18 martensite stainless steel shaft forging preparation technology. During smelting, the weight percentage of carbon in stainless steel is controlled to be 0.90-0.92%, and the weight percentages of other ingredients are as follows: 17.0-17.5% of Cr, 0.50-0.55% of Si and 0.40-0.45% of Mn; the casting temperature is controlled to be 1450-1480 DEG C; 10.5 ton of electroslag ingots are adopted for forging, the electroslag ingots are hot-charged and heated up, the heating temperature is 1140-1180 DEG C, the initial forging temperature is 1000-1120 DEG C, the finish forging temperature is higher than or equal to 950 DEG C, and the returning heating-up time cannot exceed 2 hours; after forging, normalizing and isothermal annealing are conducted, the normalizing temperature is 850-950 DEG C, and air cooling is conducted to obtain the temeprature of 650-750 DEG C for isothermal annealing. The high-carbon and high-chromium 9Cr18 martensite stainless steel shaft forging preparation technology provided by the invention controls the chemical compositions, the forging heating, the initial forging temperature, the finish forging temperature, the deformation mode, the deflection and the after-forging heat treatment temperature of steel to enable twin-crystal carbides in the steel to be moved or improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing high-carbon and high-chromium stainless steel shaft forgings, and particularly relates to the elimination or effective improvement of twin carbides in steel by controlling chemical composition, forging heating temperature, initial forging temperature, final forging temperature and post-forging heat treatment heating temperature. High carbon and high chromium 9Cr18 martensitic stainless steel shaft forging preparation process. Background technique [0002] 9Cr18 belongs to ledeburite martensitic steel, mainly used in the manufacture of bearings working in corrosive environments and non-lubricating strong oxidizing atmospheres or wear-resistant parts in harsh environments, widely used in aerospace, bearings, petrochemicals, knives, etc. industry. The normal structure of the forging after annealing is the distribution of carbides (spheroidal carbides, eutectic carbides) and a small amount of r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00C22C38/18
Inventor 王立新姚伟高全德张凯亮叶玉娟
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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