Rare earth microalloying bearing steel and preparation method thereof

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, preventing secondary oxidation, and meeting mass production

Active Publication Date: 2019-03-12
建龙北满特殊钢有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The weak high-end bearing industry is difficult to su

Method used

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  • Rare earth microalloying bearing steel and preparation method thereof
  • Rare earth microalloying bearing steel and preparation method thereof
  • Rare earth microalloying bearing steel and preparation method thereof

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specific Embodiment approach 1

[0037] A rare earth microalloyed bearing steel, said rare earth microalloyed bearing steel comprising the following components: a carbon content of 0.95 to 1.05 wt%, a silicon content of 0.15 to 0.35 wt%, and a manganese content of 0.25 to 0.45 wt% Chromium content is 1.45~1.60wt%, nickel content is 0.05~0.09wt%, molybdenum content is 0.02~0.05wt%, aluminum content is 0.010~0.050wt%, copper content is 0.06~0.08wt%, 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%, and 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%; the rest is iron.

[0038] Table 1 shows the comparison of the main indicators of the rare earth microalloyed b...

specific Embodiment approach 2

[0060] The method for preparing rare earth microalloyed bearing steel according to the first embodiment includes the following steps:

[0061] Step 1. Converter, LF-RH refining, billet continuous casting, the prepared continuous casting slab is peeled off and ready for use;

[0062] Step 2. Perform electroslag remelting of the continuous casting billet produced in Step 1, and then perform cover cooling or pit cooling, and then perform heating and rolling to open the billet. After annealing or slow cooling, perform inspection and cleaning to obtain a rolling Billet, to be used;

[0063] Step 3. The primary-rolled steel slab produced in step 2 is subjected to secondary heating and rolling, and after stack cooling or slow cooling, a secondary-rolled steel slab is prepared for use;

[0064] Step 4. After spheroidizing annealing, straightening, polishing or skinning, flaw detection, cleaning and inspection of the secondary rolled steel billet produced in step 3, the rare earth microalloyed...

specific Embodiment approach 3

[0065] According to the method for preparing rare earth microalloyed bearing steel described in the second embodiment, the electroslag remelting in step 2 adopts purified slag smelting, the purified slag smelting process adopts Ф480*520 crystallizer, and the electrode adopts grade steel. 250kg fluorite per furnace; metal electrode ignition, ignition current 0~4KA, refining current 5~6KA, refining time 30 minutes; smelting current 9.5~11KA, adding slag time 40 minutes, adding slag every 2 minutes after clearing The aluminum pellets are 1.5Kg, a total of 20 batches; after the aluminum pellets are added, the refining is stopped for 10 minutes.

[0066] In the method for preparing rare earth microalloyed bearing steel described in this embodiment, the electroslag remelting in step 2 adopts a quaternary slag system, and the slag system ratio is purified calcium fluoride, aluminum oxide, calcium oxide, The mass ratio of magnesium oxide is 27:40:18:5, and the slag system ratio is shown ...

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Abstract

The invention discloses rare earth microalloying bearing steel and a preparation method thereof and belongs to the technical field of bearing steel manufacturing. According to the technical aim, the performance of the bearing steel is improved. According to the rare earth microalloying bearing steel, converter, LF-RH refining and square billet continuous casting are carried out, electroslag remelting is carried out after scaling of a prepared continuous casting billet, then cover cooling and pit cooling are carried out, and then primary heating rolling cogging is carried out; after annealing or slow cooling is carried out, checking and cleaning are carried out, and a primary rolled steel billet is prepared and subjected to secondary heating rolling; and after stack cooling or slow coolingis carried out, a secondary rolled steel billet is prepared and subjected to spheroidizing annealing, straightening, polishing or scaling, flaw detection, cleaning and checking are carried out, and then the rare earth microalloying bearing steel is prepared. The content design ingredient of Nb ranges from 0.010% to 0.45%, and the rare earth microalloying bearing steel is suitable for being used for manufacturing various bearing rings and rolling elements and roller pins within a wide size range.

Description

Technical field [0001] The invention belongs to the technical field of bearing steel manufacturing; in particular, it 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, but the self-sufficiency rate of high-end bearings is low and a large amount of imports are dependent on them. The reliability of the bearings is low, and the performance and quality are difficult to meet the needs of high-end mainframe equipment, causing a large number of mainframes to face the dilemma of hollowing out. The technical level of aero engine bearings lags behind that of advanced countries for 20 to 30 years. High-speed rail bearings and nuclear main pump bearings all rely on imported submarines, and water-lubricated bearings for aircraft carrier propulsion systems face foreign market monopoly and blockade. The weak high-en...

Claims

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Application Information

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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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