Production process method for reducing carbide mesh grade of GCr15 bearing steel bar

A production process and technology of bearing steel, which is applied in the field of production process to reduce the carbide network level of GCr15 bearing steel bar, and can solve the problems of coarse steel structure, low network uniformity, and inapplicability

Pending Publication Date: 2021-11-26
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent is applicable to the control of the carbide network of the smaller size GCr15 bearing steel wire rod, but not applicable to the control of the carbide network of the larger size GCr15 bearing steel bar, and the structure of the steel rolled at high temperature is relatively coarse
[0005] In addition, the bearing steel carbide network uniformity currently produced by domestic steel mills is low, which seriously restricts the development of domestic high-end bearings. The raw materials required for the production of high-end bearings need to be imported from Sweden, Japan, Germany and other countries

Method used

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  • Production process method for reducing carbide mesh grade of GCr15 bearing steel bar
  • Production process method for reducing carbide mesh grade of GCr15 bearing steel bar
  • Production process method for reducing carbide mesh grade of GCr15 bearing steel bar

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Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, a production process for reducing the carbide mesh level of GCr15 bearing steel rods, the components and weight percentages of the produced bearing steel rods are: C: 0.95-1.02%, Si: 0.15-0.35% , Mn: 0.25~0.45%, Cr: 1.40~1.55%, P≤0.008%, S≤0.005%, Ni≤0.20%, Mo≤0.10%, Nb: 0.02~0.08%, Al: 0.015~0.035%, Cu ≤0.20%, Re≤0.020%, Ti≤0.0020%, O≤0.0010%, As≤0.040%, Pb≤0.0020%, Ca≤0.0010%, the rest are Fe and unavoidable impurities, including the following steps:

[0038] Step 1. Continuous casting: adopt tundish induction heating, two-stage electromagnetic stirring and light and heavy reduction process. The specification of the continuous casting slab is Φ380×450mm, which ensures the uniform composition and good surface quality of the continuous casting slab;

[0039] Step 2: Heating the continuous casting slab: put it into the furnace by hot charging process;

[0040] Step 3, continuous casting slab rolling: rolling 250mm billet;

[0041] Step 4, heating: 2...

Embodiment 2

[0051] A production process for reducing the carbide network level of GCr15 bearing steel rods in this embodiment, the basic structure is the same as that in Embodiment 1, the difference and improvement are: in the produced bearing steel rods, C, Cr, Nb The content range of Re satisfies the following formula: 1.7≤7.88(%C)+0.75(%Nb)+1.48(%Re)-4.25(%C)(%Cr)≤1.8. The content range of C, Cr, Nb, and Re is further limited by the formula, and the compound coordination effect of each element is used to promote the precipitation of secondary cementite to be finer, dispersed and uniform. Rare earth has extremely strong deoxidation, desulfurization, purification of molten steel and alloying effects, thereby improving the composition uniformity of steel; after adding trace niobium elements, the grains of bearing steel are effectively refined, increasing the grain boundary area, which is equal to increasing The nucleation point for secondary cementite precipitation is defined, and the dis...

Embodiment 3

[0053] A production process for reducing the carbide network level of GCr15 bearing steel rods in this embodiment, the basic structure is the same as in Embodiment 2, the differences and improvements are as follows: figure 1 As shown, the production of hot-rolled bars with a diameter of Φ16mm:

[0054] The chemical composition of the product: C 0.97%, Si 0.22%, Mn 0.36%, Cr 1.45%, P 0.008%, S0.001%, Ni 0.02%, Mo 0.01%, Nb 0.05%, Al 0.020%, Cu 0.03%, Re 0.015%, Ti0.0010%, O 0.0005%, As 0.004%, Pb 0.0002%, Ca 0.0002%, the rest is Fe and unavoidable impurities.

[0055] A method for reducing the deformation of the GCr15 bearing steel carbide mesh level in this embodiment comprises the following steps:

[0056] The stage of continuous casting of molten steel adopts tundish induction heating with a superheat of 18°C, two-stage electromagnetic stirring and light and heavy reduction process;

[0057] The continuous casting billet is diffused at a high temperature of 1240 ℃, and the...

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Abstract

The invention discloses a production process method for reducing the carbide mesh grade of a GCr15 bearing steel bar, and relates to the field of metallurgical special steel production and manufacturing. According to the production process method for reducing the carbide mesh grade of the GCr15 bearing steel bar, in the produced bearing steel bar, the content range of C, Cr, Nb and Re meets the following formula: 1.7 < = 7.88 (% C) + 0.75 (% Nb) + 1.48 (% Re)-4.25 (% C) (% Cr) < = 1.8, and secondary cementite is promoted to be separated out to be finer, more dispersed and more uniform through the compounding and coordinating effect of all the elements; through component design, low-temperature rolling and rapid cooling after rolling, precipitation and aggregation growth of secondary carbides on a grain boundary are inhibited, so that the carbide mesh grade of the GCr15 bearing steel bar is controlled to be smaller than or equal to 1.0 grade, and the method is suitable for producing the bearing steel bar with the specification of phi 16-40 mm.

Description

technical field [0001] The invention relates to the field of metallurgical special steel production and manufacturing, and more specifically relates to a production process for reducing the carbide mesh level of GCr15 bearing steel rods. Background technique [0002] GCr15 bearing steel is mainly used for manufacturing bearing rolling elements, balls, rollers and needle rollers. Because bearings generally operate in harsh working environments, they are under great pressure and friction during work, which requires bearing steel to have high and uniform hardness, wear resistance, and high elastic limit. The grade of carbide network is one of the important indicators to reflect the uniformity of bearing steel. The carbide network is the excessive secondary carbides precipitated along the austenite grain boundary in the hypereutectoid steel and distributed in a network shape, which increases the steel's brittleness. With the increase of the carbide network level, the brittlene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/26C22C38/28C22C38/60C22C33/04C21D8/06
CPCC22C38/02C22C38/04C22C38/22C22C38/26C22C38/06C22C38/20C22C38/005C22C38/28C22C38/60C22C33/04C21D8/065
Inventor 尹德福汪开忠丁雷胡芳忠龚梦强张晓瑞王自敏
Owner MAANSHAN IRON & STEEL CO LTD
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