High-carbon-chromium bearing steel and manufacture method thereof

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...

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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 guaranteed

no manufacturing method provided 66 EP336701 A etc. High carbon chromium bearing steel - available in small quantities of nickel, silicon, sulfur and phosphorus Aluminum content is not specified, grain size not guaranteed

no manufacturing method provided

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