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A kind of chromium-nickel-free impact-resistant bearing steel and its manufacturing method

A manufacturing method and impact-resistant technology, applied in the field of alloy steel, can solve the problems of difficult to meet the requirements of low-cost and simple process, poor impact resistance of high-carbon chromium bearing steel, difficult to solve the requirements of impact performance, etc. The effect of low material level and simple manufacturing process

Active Publication Date: 2017-05-24
宝钢特钢长材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the existing impact-resistant bearing steel still has the following disadvantages: (1) the existing high-carbon chromium bearing steel has poor impact resistance; (2) the existing Cr-Ni bearing steel, such as G20CrNi2MoA, G20Cr2Ni4Mo isotonic Carbon bearing steel, on the one hand, due to the high content of precious alloy elements, on the other hand, the complex carburizing process, it is difficult to meet the requirements of low-cost and simple process; (3) the existing bearing steel without Cr and Ni can solve the carbide problem, but It is difficult to meet the impact performance requirements under complex working conditions

Method used

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  • A kind of chromium-nickel-free impact-resistant bearing steel and its manufacturing method
  • A kind of chromium-nickel-free impact-resistant bearing steel and its manufacturing method
  • A kind of chromium-nickel-free impact-resistant bearing steel and its manufacturing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] One, according to the formula in table 2, control C to be 0.58%, Si to be 1.55%, Mn to be 0.33%, Mo to be 0.59%, Cu to be 0.20%, P to be 0.008%, S to be 0.010%, Nb to be 0.04%, Al is 0.011%, V is 0.18%, O is 0.0010%, and the balance is iron and impurities. After batching, the molten steel is initially smelted, refined, and continuously cast to obtain steel ingots. The element content reaches P≤0.035wt%, C≥0.05wt%. The temperature of the molten steel after primary refining is not lower than 1620°C. Before refining, lime or synthetic slag is added to the molten steel after primary refining. During refining, deoxidize and add Al to The Al content is 0.02-0.05wt%, the stirring is not less than 5min, and the vacuum condition of the pressure not higher than 133Pa is treated for at least 15min before pouring, and the rectangular billet is poured into a rectangular billet during pouring, and then it is directly hot-sent on-line for rolling;

[0033] 2. The rectangular billet is...

Embodiment 2

[0035] 1. According to the formula in Table 2, the control C is 0.67%, Si is 1.28%, Mn is 0.58%, Mo is 0.66%, Cu is 0.15%, P is 0.004%, S is 0.008%, Al is 0.026%, V is 0.25%, O is 0.0009%, and the balance is iron and impurities. After batching, the molten steel is initially smelted, refined, and continuously cast to obtain steel ingots. The element content in the molten steel after the initial smelting is controlled to P≤ 0.035wt%, C≥0.05wt%, the temperature of the molten steel after primary refining is not lower than 1620°C, add lime or synthetic slag to the molten steel after primary refining before refining, deoxidize and add Al until the Al content is 0.02~ 0.05wt%, stirring for not less than 5 minutes, before pouring, treat it under vacuum conditions with a pressure not higher than 133Pa for at least 15 minutes, and pour it into a rectangular billet during pouring, and then directly send it online for rolling;

[0036]2. The rectangular billet is first rolled into a squar...

Embodiment 3

[0038] One, according to the formula in table 2, control C to be 0.61%, Si to be 1.54%, Mn to be 0.28%, Mo to be 0.68%, Cu to be 0.10%, P to be 0.007%, S to be 0.015%, Nb to be 0.03%, Al is 0.010%, V is 0.23%, O is 0.0007%, and the balance is iron and impurities. After batching, the molten steel is initially smelted, refined, and continuously cast to obtain steel ingots. The element content reaches P≤0.035wt%, C≥0.05wt%. The temperature of the molten steel after primary refining is not lower than 1620°C. Before refining, lime or synthetic slag is added to the molten steel after primary refining. During refining, deoxidize and add Al to The Al content is 0.02-0.05wt%, the stirring is not less than 5min, and the vacuum condition of the pressure not higher than 133Pa is treated for at least 15min before pouring, and the rectangular billet is poured into a rectangular billet during pouring, and then it is directly hot-sent on-line for rolling;

[0039] 2. The rectangular billet is...

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Abstract

The invention discloses nickel-chromium-free impact-resistant bearing steel and a producing method thereof. The nickel-chromium-free impact-resistant bearing steel comprises the following components by weight: 0.58-0.68% of C, 1.25-1.55% of Si, 0.28-0.58% of Mn, 0.58-0.68% of Mo, 0.15-0.25% of V, 0.015-0.08% of Nb, 0.010-0.040% of Al, less than or equal to 0.015% of P, less than or equal to 0.25% of Cu, less than or equal to 0.0010% of O, less than or equal to 0.015% of S, and the balance of Fe and unavoidable impurities. The preparation method of the steel adopts a two-step technologic process, including: 1, carrying out initial refining in an electric arc furnace (or a converter), then carrying out vacuum refining in a ladle furnace, and at last carrying out continuous casting and pouring; 2, carrying out hot working for rolling the finished material with a rolling mill. The steel disclosed by the invention is free of precious alloy elements such as chromium and nickel, low in cost and simple in producing process; the bearing product prepared by the steel can be applied to the severe working environment and is long in service life.

Description

technical field [0001] The invention belongs to the field of alloy steel, and mainly relates to a chromium-nickel-free impact-resistant bearing steel and a manufacturing method thereof. Background technique [0002] Bearings used in mechanical equipment such as construction machinery, mining, and excavation are often subjected to excessive impact loads due to their very harsh working environment, and their service life is very low. Traditional high-carbon chromium bearing steels such as GCr15, GCr15SiMn, etc. have a certain degree of wear resistance due to their high carbon content, but their impact resistance is relatively weak. However, carburized bearing steels, such as G20CrNi2MoA, G20Cr2Ni4Mo and other carburized bearing steels, are often expensive because they contain high alloying elements, and the carburizing process is relatively complicated, so their application is also limited. [0003] In order to solve the above problems, some achievements have been made in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/12C22C33/04
Inventor 刘湘江
Owner 宝钢特钢长材有限公司