Liquid nitrogen lifting equipment

TDSLLiquid nitrogen lifting equipmentProcess Introduction

　　Liquid nitrogen lifting equipmentThe process can improve the performance of metal materials, which is an effective and economical technical indicator. During the deep cooling process, martensite transforms residual austenite, while fine dispersed carbides can hinder the movement of dislocations and precipitate ultrafine carbides in the material's properties, thereby strengthening the matrix structure and exerting the strengthening effect of grain boundaries, resulting in improvements in the following three aspects: impact toughness, wear resistance, and dimensional stability.

In industry, the treatment method of further cooling materials that have undergone ordinary heat treatment to 100 ℃~196 ℃ is called cryogenic treatment. It can reduce the residual oxygen content, promote the precipitation of small carbides, reduce intergranular tensile stress, and thereby improve the following macroscopic properties:

Improve hardness: High speed steel and mold steel increase Rockwell hardness by 1-2 degrees.

Improve wear resistance: The wear resistance of Cr12MoV steel is increased by 30%, and the wear resistance of 20Ni3Mo carburizing steel is increased by 89%.

Improve red hardness: The hardness of W18Cr4V increased from Rockwell hardness 57.9 to 63.9 at 625 ℃.

Improve dimensional stability: The residual austenite of 95Crl8 stainless steel is reduced from 35% to 10%.

Improve bending strength: The bending strength of 440A cast stainless steel has been increased from 1135MPa to 1355MPa.

Improve toughness: The impact energy of W6Mo5Cr4V2 has been increased from 18J to 40J.

Improving conductivity: The resistivity of copper alloy Cu-15Ni-8Sn decreased from 286 × l0-7 Ω. m to 1.5l × l0-7 Ω. m.

With the development of liquid nitrogen low-temperature technology and the improvement of experimental methods, research on cryogenic treatment has gradually deepened, and the research scope has now extended from iron production to powder metallurgy, copper, aluminum alloys, and other non-metallic materials. The application industry covers many fields such as aerospace, hardware, tools, molds, friction parts, precision machining, measuring tools, textiles, automobiles, etc.

Cryogenic technology is currently the most effective and economical way to improve the performance of metal material workpieces. Characterized by consumables, low power consumption, and no environmental pollution, it is a new type of environmental protection technology. At present, this technology has been widely applied in industries such as aerospace, shipbuilding, military, manufacturing, automotive, hardware tools, sports equipment, etc.