Cryogenic deep groove ball bearings consist of a stainless steel outer ring, stainless steel inner ring, silicon nitride (Si3N4) rolling elements, and a non-metallic cage with self-lubricating, wear-resistant, and cryogenic-resistant properties. They feature low friction resistance, high rotational speed, and can be used to withstand radial loads or combined radial and axial loads, as well as axial loads in cryogenic environments. In low-temperature environments ranging from -60°C to -196°C, ordinary steel loses its original strength and toughness due to low-temperature brittleness, leading to bearing failure. Therefore, stainless bearing steels such as 9Cr18 and 9Cr18Mo, as well as beryllium bronze and ceramics, are preferred due to their excellent low-temperature performance. In particular, ceramic materials not only exhibit high hardness and wear resistance but also maintain good thermal stability at low temperatures, making them one of the ideal materials for manufacturing ultra-low temperature bearings.
MONTON cryogenic bearings, including the bearing inner ring, bearing outer ring, bearing balls, and bearing cage, are arranged between the inner and outer rings with the balls housed within the cage. The key feature is that both the inner and outer rings are made of special stainless steel, the balls are made of ceramic, and the cage is made of polyimide. These bearings possess excellent hardness, low-temperature resistance, high-temperature resistance, fatigue resistance, heat dissipation, and wear resistance, enabling them to operate normally in the cryogenic working environment of LNG cryogenic submerged pumps, ensuring the service life of the bearings in LNG cryogenic submerged pumps.

MONTON cryogenic bearings can be used in ultra-low temperature liquid pumps such as liquid oxygen pumps, liquid nitrogen pumps, and liquefied gas pumps, as well as in liquid pumps for cryogenic equipment and spacecraft. These ultra-low temperature pumps require bearings with long life, high reliability, and the ability to be lubricated by media such as liquid oxygen, liquid nitrogen, and liquefied gas. In recent years, with the widespread application of ultra-low temperature pumps, the demand for long life and operational stability of bearings has become increasingly stringent. The inner and outer rings of ultra-low temperature bearings are made of high-nitrogen stainless steel, combined with special heat treatment and cryogenic treatment processes. The rolling elements are made of high-performance hot isostatically pressed ceramic balls, and specially processed higher-precision raceways give the bearings excellent corrosion resistance, wear resistance, and fatigue resistance. They can be lubricated by liquid oxygen, liquid nitrogen, liquefied natural gas, etc., and exhibit outstanding performance in terms of high reliability and long life.

MONTON cryogenic bearings are mainly used in cryogenic equipment such as LNG cryogenic submerged pumps. The bearings used in cryogenic submerged pumps are primarily of two types: deep groove ball bearings and angular contact ball bearings. These bearings operate in ultra-low temperature environments without lubricants and are lubricated by the pumped medium. The lubrication environment is quite harsh, requiring the bearings to have a long service life. The bearing rings are made of G95Cr18 and G102 Cr Mo stainless steel, or imported high-nitrogen stainless steels such as Cronidur30 (X30 CrMoN15-2) and X.D15N.W (X40 CrMoVN16-2). The rolling elements are made of G95Cr18 and G102 Cr Mo stainless steel, silicon nitride (Si3N4), or zirconia (ZrO2). The cage is made of non-metallic materials with self-lubricating, wear-resistant, and cryogenic-resistant properties.

Cryogenic bearings have the following characteristics:

1) Strong corrosive environments (suitable for any corrosive medium)
2) Medium lubrication environments (e.g., bearings immersed in water with water as the lubricant, liquid hydrogen or liquid oxygen environments, etc.)
3) Environments with no lubrication (dry operation)
4) Low operating temperatures
5) Anti-magnetic bearings, which can be conductive or non-conductive through different coatings.
6) The replacement cycle for ultra-low temperature pump bearings is about 6 times longer than that of conventional bearings;
7) Reduced maintenance and related costs, minimizing unplanned downtime for repairs;
8) Prevention of major pump failures, minimizing production losses, and extending equipment life;
9) Improved operational safety and reduced secondary damage to pump components;