Low Temperature Pressure Vessel Steel

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


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:What is the thickness of the water resisting steel plate of the electrical outlet?
According to the standard atlas "waterproof sleeve 02S404", the thickness of the water stopping ring steel plate should be 10mm~14mm.
Q:The difference between color steel and stainless steel
Color steel and stainless steel, stainless steel what is the difference? Color of the color is beautiful, diverse styles, economic and handsome, cheaper than stainless steel, the main difference is that the service life is about 3 years. Stainless steel is characterized by
Q:How much is a steel sheet per square meter?
Steel plates are priced by weight. They are different from one square meter in thickness and weight. The price is different.
Q:Stainless steel plate and steel welding
Depends on your stainless steel plate number and steel brand, and then choose the corresponding electrode, in general, commonly used should be 304 stainless steel, steel bar should be Q235, so with 307 of the welding rod can be welded
Q:Is galvanized iron sheet the same as galvanized steel sheet? solve
The same thing is done to slow down the rate of oxidation. Because the zinc is more active than the iron, the zinc first responds, the zinc reaction is finished, iron should. Thereby slowing down its oxidation.
Q:Is PCM steel better than galvanized steel?
In order to obtain the bending and curing enough; and can obtain good washing resistance, pollution resistance and high hardness. The pencil on the back with modified epoxy paint at the back, one can obtain good corrosion resistance, also can obtain excellent adhesion foaming.PCM color steel plate can not only meet the household appliances use environment and the requirements of the service life, but also has good processability, can meet the high speed and precision machining equipment requirements, can be used for bulk refrigerator door, side plate, back plate, box washing machine, water heater
Q:Can 16Mn steel plate be used instead of Q345D steel plate?
If the use of Q345D instead of using 16Mn, that can be, but 16Mn instead of Q345D can not, and also can not buy 16Mn steel now, that is the old number, and the latest brand is Q345A
Q:What is a water stop steel plate?
The joint position is called the new and old concrete construction joints, the waterproof concrete belongs to the weak links, increase the sealing plate, the water along the slit Jiecha position of the new and old concrete permeability met when the sealing plate can not leaking, sealing steel plays a role to cut off the water penetration path. In time, the steel plate is penetrated along the gap between the water stopping steel plate and the concrete, and the water stopping steel plate has a certain width, and the seepage path of the water is prolonged, and the utility model can also play a waterproof role.
Q:How much is one meter for laser cutting steel plates?
The above price is for low carbon steel. The price of stainless steel is lower than that of low carbon steel. Mainly nitrogen, a large amount.Of course, the specific price with the processing capacity of the size, the shape of the parts (compare all holes can not be completely by the meter, whether to count) freight, whether it is with material processing have a great relationship.
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