Mold steel manufacturers to introduce you the characteristics of bearing steel

Increase the carbon content will make the quenching residual austenite (rR) increase, tempering difficulty. The original M35 steel carbon content is low (0.80%-0.90%), by tempering can not reach the high hardness of 67HRC. 501 steel (M2A1) carbon content is high, 4cr13 mold steel has many problems. The carbon content of these two steels has now returned to normal. The new GB/T9943 standard has a big change in carbon content compared with the original standard.

How much carbon does high iron steel contain? A specific carbon method should be applied to determine it. Although steel mills produce commonly used tool steel parts in accordance with national standards, they may not be suitable. Cold work tool steel tool manufacturers should choose competitive carbon fiber according to their products.

Bearing steels are mainly used in the manufacture of moving shafts and moving rings for movable bearings. The following are some characteristics of bearing steel introduction.

Given that bearings should have long life, high precision, low heat loss, high speed, high stiffness, low noise, high wear resistance, etc., bearing steel is required to have high hardness, average hardness, high elastic limit, high contact fatigue strength, necessary toughness, certain hardenability and corrosion resistance in atmospheric lubricants.

To meet the above functional requirements, there are requirements for chemical composition uniformity, non-metallic inclusions type and content, carbide particle size and distribution, decarburization, etc. Bearing steels are very stringent. Generally speaking, bearing steel is developing in the direction of high quality, high performance and multi-species. According to the mold steel characteristics and use environment, bearing steel can be divided into high-carbon chromium bearing steel, carburized bearing steel, high-temperature bearing steel, stainless steel and special bearing steel.

In order to adapt to high temperature, high speed, high load, corrosion resistance, radiation resistance requirements, developed a number of unique features of new bearing steel. Vacuum melting, electroslag remelting, electron beam remelting and other melting processes are used to reduce the oxygen content of bearing steel.