Quality inspection of seamless stainless steel pipes

How to conduct quality inspection on seamless stainless steel pipes?

Seamless stainless steel pipes are important pipe materials commonly used in industrial production. In order to ensure their quality and safety performance, strict quality inspection is required. The following are some commonly used quality inspection methods for seamless stainless steel pipes:

1. Appearance inspection
Appearance inspection is one of the simplest and most intuitive inspection methods. The inspector needs to carefully observe whether there are obvious defects, deformations, cracks and other problems on the surface of the pipe, and whether it meets the size and shape required by the design.

2. Chemical composition analysis

Chemical composition analysis is a key method to detect whether the composition of seamless stainless steel pipe materials meets the requirements. By sampling and analyzing the chemical composition of stainless steel pipes, comparing the differences with the standard requirements, to determine whether their quality is qualified.

3. Metallographic structure analysis
Metallographic structure analysis is a method for detecting the grain structure and organizational morphology of seamless stainless steel pipes. By sampling and preparing metallographic specimens, a metallographic microscope is used to observe and analyze the grain size, corresponding proportion and distribution to evaluate the performance and quality of the pipe.

4. Physical property test
Physical property test is an important method to measure the mechanical properties of stainless steel seamless pipe materials. Common physical property test items include tensile strength, yield strength, impact toughness, hardness, etc. By testing these indicators, the strength and durability of the pipeline can be evaluated.

5. Pressure test
Pressure test is an important method to detect the pressure bearing capacity of the pipeline. By applying a certain pressure to the pipeline, observe whether the pipeline has leakage, deformation and other problems. Common pressure test methods include static pressure test and impact pressure test.

6. Ultrasonic detection
Ultrasonic detection is a method of detecting whether there are defects and cracks inside the pipeline by using the propagation and reflection characteristics of ultrasonic waves in the material. By scanning the pipeline with an ultrasonic probe and receiving the reflected signal, the location and size of the defects inside the pipeline can be determined.

7. Magnetic particle detection
Magnetic particle detection is a method of detecting the surface of stainless steel seamless pipes using a magnetic field. By applying a magnetic field on the surface of the pipeline and spreading magnetic powder under the magnetic field, the aggregation of magnetic powder at cracks and defects on the surface of the pipeline can be observed to determine whether there are problems on the surface of the pipeline.

8. Hardness test
Hardness test is a method to evaluate the deformation resistance and wear resistance of seamless stainless steel pipes. By using a hardness tester to measure the hardness value of the pipeline surface, you can understand the pressure resistance and wear resistance of the pipeline.

9. Penetrant testing
Penetrant testing is a method for detecting cracks and defects on the surface of seamless stainless steel pipes. By applying a penetrant on the surface of the pipeline, waiting for it to penetrate into the cracks and defects, and then using a developer to show them, it is possible to determine whether there are problems on the pipeline surface.

10. Pipeline connection testing

Pipeline connection testing is a method for detecting whether the connection parts of seamless stainless steel pipes are firm and whether the sealing performance is good. By applying a certain pressure and load, observe whether there are problems such as leakage and deformation at the pipeline connection parts.

Read more: 304 vs. 316 Stainless Steel: What's the Difference? or Carbon steel vs Stainless steel