What Are The Performance Test Standards for Precision Tubes?

The performance test standards for precision tubes are the key to ensuring that they can meet specific requirements in practical applications. The following is a detailed summary of the performance test standards for precision tubes:

Mechanical performance test

1. Tensile test

Test the tensile strength, yield strength and elongation of precision tubes.

These indicators can reflect the bearing capacity and plastic deformation capacity of precision tubes when subjected to tensile force, especially when manufacturing precision tubes with high strength requirements such as drill pipes.

2. Bending test

Test the fracture resistance of precision tubes when bent.

Bending tests help evaluate the stability and toughness of precision tubes when subjected to bending forces. For some precision tubes for pup joint connections that need to be bent and formed, bending tests can ensure their performance during processing and use.

3. Impact test

The impact toughness of precision tubes under low temperature conditions is measured through low-temperature impact tests (such as Charpy impact tests).

This helps evaluate the risk of brittle fracture of precision tubes in low-temperature environments.

4. Hardness test

Use Brinell hardness tester, Rockwell hardness tester or Vickers hardness tester to test the hardness of precision tube.

Hardness reflects the ability of material to resist deformation due to local pressure, which is directly related to the wear resistance and pressure resistance of precision tube.

Pressure test

1. Water pressure test

Close both ends of the precision tube, inject water with a certain pressure into the inside, keep it for a period of time, and observe whether there is leakage, deformation or bursting. The pressure of water pressure test is usually 1.5 to 2 times the design working pressure of precision tube.

2. Air pressure test

For precision tubes for certain specific purposes (such as hydraulic tubes for hydraulic systems), air pressure test may be carried out. However, the risk of air pressure test is relatively large, and water pressure test is generally the main method.

Nondestructive testing

1. Ultrasonic testing

Use ultrasonic waves to detect whether there are defects such as cracks, pores, inclusions, etc. inside the precision tube. Ultrasonic testing can detect tiny defects inside the precision tube and is a common nondestructive testing method.

2. Eddy current testing

The cracks and defects on the surface and near the surface of the precision tube are detected by eddy current method. This method is sensitive to surface defects and can quickly detect surface cracks, holes, etc.

3. Magnetic particle testing

For ferromagnetic materials, the surface of the precision tube is magnetized and magnetic particles are used to detect surface and near-surface defects. It is especially suitable for detecting linear defects such as cracks and folds. When manufacturing seamless pipes, magnetic particle testing is an effective means to find surface defects.

4. Radiographic testing

The use of X-rays or gamma rays to perform transillumination inspection of precision tubes can intuitively display internal defects. Radiographic testing is suitable for detecting internal defects in welding parts and thick-walled tubes.

Metallographic structure testing

The microstructure of the precision tube is observed under a microscope to check the grain size, grain boundary state, non-metallic inclusions, etc. to evaluate the material and heat treatment quality of the precision tube.

This detection method is particularly important for precision tubes because it can reveal the microstructural characteristics inside the precision tube and provide more in-depth information for quality assessment.

Corrosion resistance test (if applicable)

For precision tubes that need to work in specific corrosive media, it is necessary to conduct corrosion resistance testing.

Corrosion tests are conducted on precision tubes under simulated environmental conditions to determine their corrosion resistance under specific conditions.

Temperature test (if applicable)

For precision tubes that need to work under high or low temperature conditions, temperature testing is also important.

Temperature testing can evaluate the thermal stability and thermal expansion performance of precision tubes under high or low temperature environments.

Summary

In summary, the performance test standards for precision tubes cover mechanical properties testing, pressure testing, non-destructive testing, metallographic structure testing, corrosion resistance testing, and temperature testing. These test standards are designed to ensure that precision tubes can meet specific performance requirements in actual applications, thereby ensuring their safety and reliability.

Read more: The difference between precision tube and seamless tube or Difference between seamless pipe and seam pipe