Method for reducing macro segregation at 1/2R position of bearing steel wire rod

A macro-segregation, bearing steel technology, applied in the field of metallurgy, can solve problems such as the inability to prevent tissue segregation, and achieve the effects of inhibiting long-distance diffusion, reducing the degree of segregation, and preventing the formation of segregation zones

Active Publication Date: 2015-01-28
武安市裕华钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the chromium content of GCr15 bearing steel is as high as 15%, its microstructure and mechanical properties are different from ordinary Cr and Mo steels such as 35CrMo, and its macrostructure defects are also different from ordinary Cr and Mo steels. The method of 201210174384.X patent was adopted in the test When rolling GCr15 bearing steel, it cannot prevent defects such as structural segregation at 1 / 2R of the rolled wire

Method used

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  • Method for reducing macro segregation at 1/2R position of bearing steel wire rod
  • Method for reducing macro segregation at 1/2R position of bearing steel wire rod
  • Method for reducing macro segregation at 1/2R position of bearing steel wire rod

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Effect test

Embodiment 1

[0032] Adopt 325mm×280mm bloom continuous casting-blanket-wire rolling process to produce Φ15mm wire rod for high-strength bolts, the chemical composition of the bearing steel used is: C: 0.95-1.05%, Si: 0.15-0.35% , Mn: 0.25-0.45%, S: ≤ 0.025%, P ≤ 0.025%, Cr: 1.4-1.65%, and the balance is iron. The above-mentioned bearing steel wire rod is processed according to the following steps:

[0033] (1) The bearing steel with the above composition is continuously casted. During the continuous casting process, the parameters of the billet continuous casting machine are set as follows: electromagnetic stirring intensity 400A, frequency 2Hz, total water volume in the secondary cooling zone 113.25L / min, total cooling water volume in the wide surface The amount of cooling water is controlled at 59.8L / min; the total amount of cooling water on the narrow surface is controlled at 53.45L / min; the specific water volume is 0.21L / kg, the pouring temperature is 1473°C, and the casting speed is 0...

Embodiment 2

[0040]The Φ10mm wire rod for high-strength bolts is produced by using the 325mm×280mm bloom continuous casting-billet opening-wire rolling process. The chemical composition of the bearing steel used is: C: 0.95-1.05%, Si: 0.15-0.35% , Mn: 0.25-0.45%, S: ≤ 0.025%, P ≤ 0.025%, Cr: 1.4-1.65%, and the balance is iron. The above-mentioned bearing steel wire rod is processed according to the following steps:

[0041] (1) The bearing steel with the above composition is continuously casted. During the continuous casting process, the parameters of the billet continuous casting machine are set as follows: electromagnetic stirring intensity 500A, frequency 2.5Hz, total water volume in the secondary cooling zone 125.4L / min, wide surface cooling water The total amount is controlled at 66.45L / min; the total amount of narrow surface cooling water is controlled at 58.95L / min; the specific water volume is 0.202L / kg, the pouring temperature is 1488°C, and the casting speed is 0.65m / min;

[004...

Embodiment 3

[0048] Adopt the same bearing steel wire rod as embodiment 2, and process according to the following steps:

[0049] (1) Carry out continuous casting of bearing steel. During the continuous casting process, the parameters of the billet continuous casting machine are set as follows: electromagnetic stirring intensity 450A, frequency 2.2Hz, total water volume in the secondary cooling zone 120L / min, and total cooling water volume in the wide surface is controlled at 60.8 L / min; the total amount of cooling water on the narrow surface is controlled at 60L / min; the specific water volume is 0.205L / kg, the pouring temperature is 1480°C, and the casting speed is 0.70m / min;

[0050] (2) Put the continuous casting slab after continuous casting into the heat preservation car for 5 minutes, close the heat preservation car cover, put it into the heat preservation pit within 20 minutes, and slowly cool it for 75 hours;

[0051] (3) The slow-cooled continuous casting billet is opened, and the...

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Abstract

The invention discloses a method for reducing macro segregation at the 1/2R position of a bearing steel wire rod, and relates to the metallurgy field. The bearing steel wire rod with the macro segregation at the 1/2R position relieved or eliminated is obtained by controlling the electromagnetic stirring intensity, frequency, the total water of a secondary cooling zone, the specific water flow, the casting temperature and pulling rate in the bearing steel continuous casting process, carrying out heat preservation and retarded cooling on a continuous casting billet after continuous casting is carried out, controlling heating time and temperature in the blooming process, carrying out cooling in heap in a heat preservation pit after blooming is carried out, and controlling rough rolling temperature, fine rolling temperature and spinning temperature in the rolling process and the cooling rate and cooling temperature after spinning is carried out. The segregation at the 1/2R position of the bearing steel wire rod obtained according to the method is smaller than or equal to 1.5, and quality of a bearing steel product is improved greatly.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for reducing macro-segregation at 1 / 2R of bearing steel wire rods. Background technique [0002] Bearing steel is an important metallurgical product, widely used in industries such as aerospace, military industry, machinery manufacturing, railway transportation, wind power generation, and automobile manufacturing. High-carbon chromium bearing steel is the most widely used steel in my country's bearing industry. The rolling elements and rings of rolling bearings are mainly made of bearing steel, accounting for more than 85% of the steel used in the bearing industry. GCr15 is a representative of this type of steel. One of the sexiest steel grades. [0003] The segregation at 1 / 2R of the bearing steel wire (segregation at 1 / 4D, and the distance from the center of the cross-section of the wire is half the radius of the wire) and the segregation at the center of the wire are importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B21B37/74C21D8/06
Inventor 徐东郑冰
Owner 武安市裕华钢铁有限公司
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