High-carbon-chromium bearing steel and manufacture method thereof

A high-carbon chromium bearing steel and a manufacturing method technology, applied in the field of bearing steel, can solve the problems of not providing a manufacturing method, not stipulating the aluminum content, unable to guarantee the grain size, etc.

Inactive Publication Date: 2009-10-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

No Provide manufacturing method 65 EP337639A High carbon chromium bearing steel - steel containing bearings - mention Provide resistance to plastic deformation and tempering, and can improve rolling fatigue life Aluminum content is not specified, grain size not g

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  • High-carbon-chromium bearing steel and manufacture method thereof
  • High-carbon-chromium bearing steel and manufacture method thereof
  • High-carbon-chromium bearing steel and manufacture method thereof

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Embodiment Construction

[0080] The following embodiments are in accordance with the range of the weight percentage of the chemical composition of the high-carbon chromium bearing steel of the present invention. The process flow is: electric furnace smelting → ladle furnace refining → vacuum furnace degassing → molten steel pouring into ingots → ingot heating in heating furnace → rolling mill to roll steel ingots into square billets → billet heating in heating furnace → rolling mill to roll billets Into round steel.

[0081] Electric furnace smelting: It is carried out in a direct current or alternating current electric furnace of more than 30 tons, and the residual phosphorus content and titanium content in the steel are reduced to less than 0.008% and less than 0.0005%, respectively.

[0082] Ladle furnace refining: On an AC ladle refining furnace that matches the capacity of the electric furnace, low-oxygen and low-titanium of the molten steel are carried out to reduce the oxygen content of the molten ...

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Abstract

The invention discloses high-carbon-chromium bearing steel and a manufacture method thereof. The high-carbon-chromium bearing steel comprises the following chemical compositions by weight percentage: C: 0.90-1.05; Cr: 0.90-1.20; Mn: 0.90-1.25; Si: 0.45-0.75; Al: 0.02-0.04; oxygen is less than or equal to 0.0007; phosphorus is less than or equal to 0.010; sulfur is less than or equal to 0.005; titanium is less than or equal to 0.0025; copper is less than or equal to 0.15; nickel is less than or equal to 0.10; nitrogen is less than orequal to 0.0070; and the balance of unavoidable impurities and Fe. The manufacture method comprises the following steps: smelting in an electric furnace, refining in a ladle arc furnace, degassing in a vacuum furnace, pouring steel liquid into steel ingots, heating steel ingots in a heating furnace, rolling the steel ingots into square billets by a rolling mill, heating the steel ingots in a heating furnace and rolling the steel ingots into round steel by a rolling mill. Compared with the prior art, the invention has high hardenability, high crystal grain size of more than 8 grade, high commonality in technology and wide application.

Description

Technical field [0001] The invention relates to bearing steel, in particular to the composition of high-carbon chromium bearing steel and its manufacturing process. Background technique [0002] Bearing steels can be divided into high-carbon chromium bearing steels, carburized bearing steels, medium-carbon bearing steels, stainless bearing steels, and high-temperature bearing steels according to their carbon content and uses. [0003] With the continuous expansion of the use of high-carbon chromium bearing steel and the continuous research of bearing manufacturers on bearings, especially large-scale and special-purpose bearings, people are pursuing higher steel purity and carbide uniformity, and at the same time The requirements for the structure and performance of carbon-chromium bearing steels are constantly improving. It is hoped that the higher the hardenability of high-carbon chromium bearing steels, the better, and the finer the grain size in the steel, the better. For exam...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/50C21C5/52C21C7/04C21C7/10C21D1/00
Inventor 虞明全胡俊辉刘军占郑雨旸
Owner BAOSHAN IRON & STEEL CO LTD
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