Low Temperature Pressure Vessel Steel

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Introduction

Low temperature pressure vessel (low temperature pressure vessel), is a kind of cryogenic vessel.

Summary

Design of temperature for pressure vessel -20 DEG C; the container is of low temperature pressure vessel for storage and transportation of liquefiedethylene and liquefied natural gas, liquid nitrogen and liquid hydrogen etc..The general pressure vessel commonly used ferritic steels in the temperaturedown to a temperature, the toughness of the steel will decrease sharply, and is very brittle, this temperature is usually referred to as the ductile brittle transition temperature. The use of pressure vessel in below the transition temperature conditions, due to defects, residual stress, stress concentrationand other factors caused by the high local stress such as the existence of a container, the container may be in no obvious plastic deformation under the condition of brittle rupture and disastrous accident. For low temperature pressure vessel must first select suitable materials, these materials should have good toughness at service temperature. The grain size of low alloy steelsavailable to -45 DEG C, 2.5% nickel steel available to -60 DEG C, 3.5% nickel steel available to -104 DEG C, available at -196 deg.c for 9% nickel steel.Below -196 DEG C when the selection of austenitic stainless steel andaluminum alloy etc.. In order to avoid local high stress in low temperaturepressure vessel, in the design of container should avoid excessiveconcentration of stress and additional stress; be strict inspection inmanufacturing the container, in order to prevent dangerous defects exist in the container. For because of the welding residual stress caused by excessive,should eliminate welding residual stress treatment after welding.

Performance characteristics

Cryogenic vessel performance and features of industrial [1] with liquid nitrogenat extremely low temperatures by nitrogen pressure variable is a colorless liquid, low temperature container at liquid nitrogen temperature is very low, and then use the cylinder holding, then put the cylinder in normal temperature, due to the environment temperature, temperature of liquid nitrogen is placed inside the bottle rises, also into the room temperature, then the liquid nitrogen in the bottle pressure will become higher.

But in the actual case, either the cylinder heat preservation effect is very good,or pressure safety valves, cylinders placed either opening time is very short.The cylinder temperature could not reach the normal temperature.

The industrial use of the liquid nitrogen at extremely low temperatures by nitrogen pressure variable is a colorless liquid, then the liquid nitrogentemperature is very low, and then use the cylinder holding, then put the cylinder in normal temperature, low temperature storage tank due to environmental temperature, then:

The bottle containing liquid nitrogen transformation could take place, i.e.vaporized, by liquid nitrogen into gaseous nitrogen, the cylinder pressure rise,this time the inside temperature or liquid nitrogen and nitrogen coexisttemperature is generally -196 degrees, absorb heat temperatures continue to rise, the pressure continues to rise, pressure safety valve will work, relief. If nopressure relief, only temperature, pressure of liquid nitrogen in the cylinder will be very high, resulting in high pressure vessel explosion.

Liquid nitrogen tank insulation effect is very good, the liquid nitrogen can bestored for 1 months does not vaporize finish inside.


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Q:16 what is the hardness of manganese steel plates?
Manganese steel is a kind of steel with high strength. It is mainly used in harsh working conditions, such as impact, extrusion and material wear. The form of failure is mainly wear and tear, and it is partly broken and deformed.
Q:What's the best way to open a 10mm thick steel sheet?
Steel plate is a kind of flat steel with big width ratio and large surface area. According to the thickness of plate Ya divided into thick and thin plates two specifications.
Q:Is color steel plate the same as color steel tile?
Color steel plate color steel plate refers to color coated steel plate, color coated steel plate is a kind of organic coated steel plate.Color steel plate coating is cold-rolled steel sheet, galvanized steel sheet, after surface chemical treatment, coating (roll coating) or composite organic film (PVC film, etc.), and then baked, cured and made of products.
Q:How do you calculate the square footage of a ton of steel?
The width of the sheet is 500~1500 mm; the thickness is 600~3000 mm. According to the type of steel sheet, ordinary steel, stainless steel, alloy steel, spring steel, stainless steel, tool steel, heat-resistant steel, bearing steel, silicon steel and industrial pure iron sheet; according to professional use, with drums board, enamel board, bulletproof plate; surface coating and plating, plating with zinc thin plate, tin plate, plating lead sheet, plastic composite plate
Q:What is the difference between an open plate and an original plate?
Open and flat from the original flat surface color to distinguish. Because the Kaiping plate originally is rolled strip, the oxide is less, the same time the Kaiping plate and the original flat for a period of time after the original flat in different colors, red, and blue plates.
Q:Is the cold rolled steel plate good or the stainless steel plate?
Although it is impossible to provide specific parameters to prove, in fact, most stainless steel plates are used in oven making. Corrosion resistant, easy to clean, safe and sanitary.
Q:What's the difference between steel plate 20 and Q235 steel plate?
In the normalizing state of No. 20 steel, the yield point is 245MPa, the elongation is >25%, the quenched and tempered state, the yield point is 280MPa, and the elongation is >22%. Widely used in the production of small, high load toughness requirements of parts, such as rod, heavy and general machinery in forging the sleeve, fixture and liner, general machinery and automobiles and tractors in small parts of carburizing, cyaniding.
Q:Are there any restrictions on the thickness of the steel plate, such as the minimum thickness of the steel plate?
The information of the building is incomplete and can not be determined. The welding technical parameters will affect the welding method, welding current, welding voltage, welding environment and specifications
Q:How to choose welding method for welding different plate and thick steel plate?
Plate groove, the groove thickness is less than or equal to the thickness of the sheet, the welding arc to a plate, the molten pool of molten iron melt sheet, the specific point of view of plate thickness difference, observe the molten pool adjust current, prevent sheet welding, double-sided welding when necessary.
Q:How is the normalized steel plate produced?
The main purpose of normalizing is to refine the structure, to improve the properties of the steel, and to obtain a structure close to the equilibrium state. Compared with the annealing process, the main difference between normalizing and annealing is that the cooling rate of normalizing is a little faster, so the production cycle of positive heat treatment is short. Therefore, when annealing and normalizing can meet the performance requirements of parts, normalizing shall be used as much as possible. Most medium and low carbon steel billets are usually treated with positive heat. General alloy billet material often adopts annealing, if normalizing, because the cooling rate is faster, make its normalizing higher hardness, is not conducive to cutting.

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