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
CN104259361BActive Publication Date: 2017-05-10HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
Publication Date
2017-05-10

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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.
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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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