1. Chemical composition is one of the important factors affecting material properties, and it is necessary to ensure that the composition meets the standard requirements. Spectroscopic analysis: The chemical composition of stainless steel plates is analyzed using instruments such as spectrometers to detect the content of key elements such as chromium, nickel, and molybdenum. The content of these elements has a significant impact on the corrosion resistance and strength of stainless steel.
The test results are compared with national or industry standards for stainless steel to confirm whether its chemical composition meets the requirements.

2. Mechanical performance testing is required.
Mechanical properties include tensile strength, yield strength, elongation, and other indicators, which are important parameters for evaluating the strength and plasticity of materials. Tensile tests can be performed using a universal testing machine to obtain tensile curves and related parameters, such as yield strength and elongation.

3. Impact performance testing is required.
Impact performance is an indicator of a material's impact resistance. It can be tested using an impact testing machine to obtain parameters such as impact absorbed energy and impact strength.
Stainless steel sheets need to have good impact resistance under certain special conditions, such as in low-temperature environments.

4. Perform a hardness test.
Hardness is a material's ability to resist scratches and deformation. It can be tested using hardness measuring instruments such as a Rockwell hardness tester to obtain the material's hardness value.
Hardness is closely related to the strength of a material, and hardness testing can assess a material's resistance to scratches.

5. Perform microscopic tissue analysis.
Microstructure is the internal microstructure of a material, which directly affects its mechanical properties and corrosion resistance.
The microstructure of medium-thick stainless steel plates can be observed and analyzed using instruments such as metallographic microscopes to understand information such as grain size, grain boundaries, and phase distribution.

Generally, ordinary directly buried prefabricated insulation pipe, when using common insulation materials, can withstand a maximum temperature of around 120 degrees Celsius. Within this temperature range, the insulation material has a stable structure, maintains good insulation and physical properties, and ensures the normal operation of the pipeline. High-temperature resistant directly buried prefabricated insulation pipe produced using special formulas and processes can withstand temperatures up to 150°C or even higher. However, it should be noted that prolonged exposure to extremely high temperatures will accelerate the aging of insulation materials, leading to a decline in insulation performance. It may also affect the performance of the outer protective pipe and steel pipe, shortening the service life of the pipeline. In practical applications, it is necessary to accurately select the appropriate type of directly buried prefabricated insulation pipe based on the temperature of the conveyed medium to ensure that the pipeline operates within a safe temperature range.