Shandong Zhongjie Special Equipment Co., Ltd. (formerly Heze Boiler Factory Co., Ltd.) was established in 2001 and is located at No. 2218 Jinnan Road, Economic Development Zone, Heze City. With a registered capital of 50 million yuan and total assets of 500 million yuan, the company has seven business centers: boilers, deep-freezing vessels, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It operates three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently employs 710 people, including 247 engineers and technicians and 82 intermediate-level technical personnel. In December 2016, it was recognized as a "High-Tech Enterprise" by the Science and Technology Department. In June 2021, it was identified as a "Specialized and New Enterprise in Shandong Province" by the Industrial and Information Technology Department. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, it was identified as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
When storing liquid nitrogen in low-temperature storage tanks, the following points should be noted:
Protective Gear: When operating low-temperature storage tanks, it is mandatory to wear appropriate protective gear, including gloves, protective suits, and non-slip shoes. This gear safeguards the skin from the low temperatures of liquid nitrogen and other hazards.
Avoid Direct Contact: Liquid nitrogen is extremely cold and can cause chilling. Therefore, direct contact with liquid nitrogen should be avoided, especially with the skin. Use tools or utensils for handling to prevent direct hand contact with liquid nitrogen.
Ventilation Requirements: In the operational area of low-temperature storage tanks, adequate ventilation must be ensured to expel gases produced by the evaporation of liquid nitrogen. Maintain air circulation to avoid excessive oxygen concentration, and reduce the risk of fire and explosion.
Prevent Leaks: Regularly inspect the low-temperature storage tanks for leaks and equip with leak detectors and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid the hazards of liquid nitrogen leaks to personnel and the environment.
Fire Prevention Measures: Liquid nitrogen has a low boiling and freezing point, which is prone to causing fires. Measures such as setting up fire barriers around low-temperature storage tanks and using fire-resistant coatings are taken to prevent fires from occurring and spreading.
Static protection: Electrostatic buildup in low-temperature tanks may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Regular inspections and maintenance: Conduct regular checks on the condition of low-temperature storage tanks and related equipment, including valves, pipes, pressure gauges, etc. Ensure that the equipment is in perfect condition, and promptly repair or replace any damaged parts.
Waste Gas Treatment: Low-temperature storage tanks produce waste gas during operation, which requires appropriate waste gas treatment measures to minimize environmental impact.
Above are the precautions to be taken when storing liquid nitrogen in a low-temperature storage tank, to ensure operational safety and the normal operation of the tank. During the operation, it is essential to strictly follow the relevant operational procedures and safety requirements to avoid accidents.

The application of strain-hardening in austenitic stainless steel on low-temperature pressure vessels is a common method, which enhances the material's strength and durability. Here are some details regarding the application of strain-hardening in austenitic stainless steel on low-temperature pressure vessels:
Principle of Strain Hardening: Strain hardening is achieved by introducing plastic deformation into the material, which alters the crystal structure, thereby enhancing the material's strength. In Austenitic stainless steel, strain can be introduced through methods such as cold working (e.g., cold rolling, cold drawing) or heat treatment (e.g., solution treatment and cold deformation), causing dislocation and grain boundary sliding in the crystal structure, which in turn increases the material's strength.
Low Temperature Application Advantages: Austenitic stainless steel exhibits excellent corrosion resistance and low-temperature toughness in低温 environments. Strain hardening further enhances the strength and durability of austenitic stainless steel, enabling it to perform in low-temperature pressure vessels. Under low-temperature conditions, strain hardening effectively resists plastic deformation and fracture, improving the material's tensile strength and impact resistance.
Application Cases: Strain-hardened austenitic stainless steel is widely used in low-temperature pressure vessels. For instance, in liquid nitrogen, liquid oxygen, and liquid argon tanks, among other low-temperature containers, strain-hardened austenitic stainless steel is commonly used as structural material. These vessels must withstand high pressure and impact loads at low temperatures; strain hardening enhances the material's strength and durability, ensuring safe operation of the containers.
It should be noted that the strain hardening of austenitic stainless steel must be conducted at suitable temperatures and deformation conditions to avoid excessive deformation and material embrittlement. When designing and manufacturing low-temperature pressure vessels, it is essential to rationally select and apply the strain hardening of austenitic stainless steel based on specific engineering requirements and material characteristics.

Liquid argon storage tanks are equipment used for storing and transporting liquid argon, featuring the following characteristics:
Low Temperature Retention: The liquid argon tank is equipped with special insulating materials and structural design, effectively maintaining the low-temperature state of liquid argon. The tank is internally insulated to minimize heat transfer and loss, ensuring long-term storage of liquid argon.
High-seal performance: The liquid argon storage tank boasts excellent sealing properties, effectively preventing any leakage or evaporation of liquid argon. The tank's valves, connectors, and sealing parts are precisely designed and manufactured to ensure reliable sealing performance.
High strength and corrosion resistance: The liquid argon tank is made of high-strength materials, capable of withstanding the high pressure and low temperature of liquid argon. Both the internal and external surfaces of the tank are specially treated for excellent corrosion resistance, able to resist corrosion and oxidation from liquid argon.
Safety Performance: The liquid argon tank is equipped with multiple safety protection measures, including safety valves, pressure sensors, and level monitoring devices. These devices monitor and control the tank's pressure, temperature, and level to ensure the tank operates within a safe range.
Reliability and stability: The liquid argon storage tank has undergone rigorous design, manufacturing, and testing, offering excellent reliability and stability. The tank is capable of long-term stable storage and transportation of liquid argon, ensuring that the quality and performance of the liquid argon remain unaffected.
Easy to operate and maintain: The liquid argon tank is relatively simple to operate and maintain, equipped with easy-to-use valves and fittings. The maintenance tasks mainly include regular inspections, cleaning, and repairs, which can extend the lifespan of the tank.
The performance characteristics of liquid argon storage tanks make them an essential storage and transportation device for liquid argon, widely used in scientific research, industry, and other fields. When using liquid argon storage tanks, it is necessary to strictly adhere to the relevant operational specifications and safety requirements to ensure safe usage.

The dimensions and structures of liquid oxygen storage tanks can vary according to specific requirements and applications. Below are common dimensions and structures of liquid oxygen storage tanks:
Dimensions: The size of liquid oxygen tanks is typically determined by the storage or transportation capacity of liquid oxygen. Common capacity ranges for liquid oxygen tanks vary from a few thousand liters to several hundred thousand liters.
Structure: The structure of the liquid oxygen tank mainly includes the inner shell, outer shell, insulation layer, and supporting structure, etc.
Inner Shell: The inner shell of a liquid oxygen tank is the part designed for storing liquid oxygen, commonly made of materials like stainless steel or aluminum alloy, offering excellent corrosion resistance and sealing properties.
Shell: The shell of a liquid oxygen tank is the external structure that protects the inner lining, typically made of carbon steel or stainless steel, offering sufficient strength and corrosion resistance.
Insulation Layer: The insulation layer of the liquid oxygen storage tank is designed to minimize heat transfer and loss, maintaining the low temperature of the liquid oxygen. Common insulation materials include polyethylene foam, glass fiber, and aerogel, etc.
Support Structure: The support structure of the liquid oxygen tank is designed to support and secure the inner and outer shells of the tank. Typically made of steel, it offers sufficient strength and stability.
The dimensions and structural design of liquid oxygen storage tanks must consider the properties of liquid oxygen, storage or transportation requirements, safety standards, and other factors. When using liquid oxygen storage tanks, it is essential to strictly adhere to the relevant operational specifications and safety requirements to ensure safe usage.
Zhongjie Special Equipment adheres to the grand vision of "realizing employee dreams, creating customer value, and striving for the prosperity and strength of our motherland," devoting itself to the development of the green energy equipment industry, and dedicating high-value products and services to society!