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A kind of rare earth microalloyed bearing steel and its preparation method

A technology of microalloying and bearing steel, which is applied in the field of bearing steel manufacturing, can solve the problems that the high-end bearing industry is difficult to support industrial transformation and upgrading, and achieve the effect of improving product purity, good dimensional stability, and meeting mass production

Active Publication Date: 2021-02-12
建龙北满特殊钢有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The weak high-end bearing industry is difficult to support the transformation and upgrading of the industry

Method used

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  • A kind of rare earth microalloyed bearing steel and its preparation method
  • A kind of rare earth microalloyed bearing steel and its preparation method
  • A kind of rare earth microalloyed bearing steel and its preparation method

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Effect test

specific Embodiment approach 1

[0038] A rare-earth micro-alloyed bearing steel, the rare-earth micro-alloyed bearing steel comprises the following components: carbon content of 0.95-1.05 wt%, silicon content of 0.15-0.35 wt%, manganese content of 0.25-0.45 wt% , the chromium content is 1.45-1.60wt%, the nickel content is 0.05-0.09wt%, the molybdenum content is 0.02-0.05wt%, the aluminum content is 0.010-0.050wt%, the copper content is 0.06-0.08wt%, and the niobium content is 0.010 ~0.045wt%; phosphorus content is less than 0.01wt%, sulfur content is less than 0.008wt%, yttrium content is less than 0.015wt%, cerium content is less than 0.008wt%, titanium content is less than 0.0020wt%, oxygen content is less than 0.002wt%, arsenic content is less than 0.040wt%, tin content is less than 0.030wt%, antimony content is less than 0.005wt%, lead content is less than 0.002wt%, calcium content is less than 0.001wt%, and the rest is iron.

[0039] A kind of rare earth microalloyed bearing steel described in this embo...

specific Embodiment approach 2

[0062] According to the preparation method of a rare earth microalloyed bearing steel described in the first embodiment, the method comprises the following steps:

[0063] Step 1, converter, LF-RH refining, billet continuous casting, after peeling the obtained continuous casting billet, stand by;

[0064] Step 2: Carry out electroslag remelting to the continuous casting slab obtained in step 1, then carry out cover cooling or pit cooling, and then carry out heating and rolling to open the billet once, after annealing or slow cooling, check and clean up to obtain a rolled billet, ready for use;

[0065] Step 3. Carrying out secondary heating and rolling of the primary rolling steel billet obtained in step 2, and after stack cooling or slow cooling, the secondary rolling steel billet is prepared for use;

[0066] Step 4. Spheroidizing and annealing the secondary rolling steel slab obtained in step 3, straightening, polishing or peeling, flaw detection, cleaning and inspection, ...

specific Embodiment approach 3

[0068] According to the preparation method of a rare earth microalloyed bearing steel described in the second specific embodiment, in step 2, the electroslag remelting is smelted using purified slag smelting, the purified slag smelting process uses a Ф480*520 crystallizer, and the electrode uses grade steel. 250kg fluorite per furnace; metal electrode arc ignition, arc ignition current 0-4KA, refining current 5-6KA, refining time 30 minutes; smelting current 9.5-11KA, slag adding time 40 minutes, adding slag every 2 minutes Aluminum pellets 1.5Kg, 20 batches in total; Refining for 10 minutes after adding aluminum pellets and shutting down the furnace.

[0069] In the preparation method of a rare earth microalloyed bearing steel described in this embodiment, the electroslag remelting in step 2 adopts a quaternary slag system, and the ratio of the slag system is purified calcium fluoride, aluminum oxide, calcium oxide, The mass ratio of magnesium oxide is 27:40:18:5, and the rat...

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Abstract

The invention relates to a rare earth micro-alloyed bearing steel and a preparation method thereof, belonging to the technical field of bearing steel manufacture. The technical problem to be solved by the invention is to improve the performance of the bearing steel. A kind of rare earth micro-alloyed bearing steel converter, LF-RH refining, square billet continuous casting according to the present invention, the continuous casting billet obtained is peeled off and then electroslag remelted, then subjected to cover cooling or pit cooling, and then carried out After one-time heating and rolling, after annealing or slow cooling, inspection and cleaning are carried out, and the primary rolled steel billet is subjected to secondary heating and rolling. After straightening, polishing or peeling, flaw detection, cleaning and inspection, the above-mentioned rare earth microalloyed bearing steel is obtained. The Nb content of the present invention is designed to be 0.010-0.045%, and the rare earth microalloyed bearing steel is suitable for manufacturing various bearing rings and rolling elements and needle rollers with a wide size range.

Description

technical field [0001] The invention belongs to the technical field of bearing steel manufacturing, and in particular relates to a rare earth microalloyed bearing steel and a preparation method thereof. Background technique [0002] Nowadays, the bearing industry is developing rapidly, and the overall scale and strength have reached a new level. However, the self-sufficiency rate of high-end bearings is low, and a large number of them rely on imports. The reliability of bearings is low, and the performance and quality are difficult to meet the needs of high-end host equipment, resulting in a large number of hosts facing the dilemma of empty shells. The technical level of aero-engine bearings is 20-30 years behind advanced countries. High-speed rail bearings and nuclear main pump bearings all rely on imported submarines, and aircraft carrier propulsion system water-lubricated bearings face foreign market monopoly and blockade. The weak high-end bearing industry is difficult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21D1/32C21D6/00C21D8/00C21D9/00C22B9/18C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/60
CPCC21C7/0006C21C7/06C21D1/32C21D6/004C21D6/005C21D6/008C21D8/005C21D9/0081C21D2211/009C22B9/006C22B9/18C22C33/04C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/60
Inventor 熊洪进李彬王强金博鑫陈列董贵文马忠存谢奎龙
Owner 建龙北满特殊钢有限责任公司
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