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What are the physical properties of sanitary stainless steel pipe fittings at low temperatures?
Jul 12, 2018

Sanitary pipe fittings have good corrosion resistance, heat resistance, low temperature strength and mechanical properties.

Corrosion resistant in the atmosphere, if it is an industrial atmosphere or heavily polluted areas, it needs to be cleaned in time to avoid corrosion.

Suitable for processing, storage and transportation of food. Has good processing properties and weldability.

Physical properties of sanitary stainless steel pipe fittings at low temperatures:

1. Low-temperature processing --- The martensite series stainless steel is quenched from the austenitizing temperature and then cooled to a very low temperature to promote the quenching method for producing martensite.

Suitable for stainless steel that is easy to produce retained austenite.

Regarding the low-temperature state, the ferritic stainless steel tube has low-temperature brittleness like carbon steel, while the austenitic steel does not.

Therefore, the ferrite or martensitic stainless steel pipe is subjected to low temperature embrittlement while the austenitic stainless steel or nickel based alloy does not exhibit low temperature brittleness.

The SUS410 (13Cr), SUS430 (18Cr), etc. of the ferritic stainless steel pipe showed a sharp drop in the impact value at a low temperature.

Therefore, it is necessary to pay special attention when using it at low temperatures.

As a method of improving the impact toughness of the ferritic series stainless steel, a high purification process can be considered.

By controlling the C, N level and the embrittlement temperature is improved from -50 ° C to -100 ° C, it is possible to use it for freezing related engineering.

In recent years, SUS430LX (18Cr-Ti, Nb-LC) and SUS436L (18Cr-Mo-Ti, Nb-LC) have been applied to the casing of a refrigerating device.

2. Low temperature embrittlement --- In low temperature environment, the deformation energy is small.

In a low temperature environment, the phenomenon that the elongation and the reduction of the area are reduced is called low temperature embrittlement. It is mostly produced on the body-centered cubic structure of the ferrite series.

Shanghai KS Flow Control Equipments Co.,Ltd is a valve manufacture with more than 30 years of valve manufacturing experience, which set up in 1984,specializing in Ball Valve,Gate Valve, Globe Valve, Check Valve and Butterfly Valve.

The company has advanced processing and manufacturing equipment, more than 70 CNC machine tools and machining centers, three spray lines. The company has established a complete physical and chemical laboratories, with direct reading spectrometer, spectrum alloy analyzer, helium mass spectrometer leak detector, electronic universal testing machine, coordinate measuring instrument, nondestructive testing, torque life test, high and low temperature comprehensive performance test device Etc.

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