316L Stainless Steel Tubing

1.Appearance inspection

The surface should be smooth without scratches, pits, oxide layers or rust spots, and the two ends of the cut should be flat without burrs.

The weld area needs to be inspected for defects such as cracks and pores, and the surface color should be uniform and consistent.

2.Dimensional measurement

Use tools such as calipers and micrometers to measure parameters such as outer diameter, wall thickness, and length to ensure compliance with national standards or contractual requirements.

Precision pipes need to be checked for ovality and straightness deviation.

3.Mechanical performance testing

Detect tensile strength (≥ 485MPa), yield strength (≥ 170MPa), and elongation (≥ 40%) through tensile testing.

Impact test verification of low-temperature toughness (applicable to special purpose pipes) 2.

4. Chemical composition testing

Use a direct reading spectrometer or handheld XRF device to determine the content of key elements (such as Cr: 16.5-18.5%, Ni：10-14%，Mo： 2-3%), ensuring compliance with 316L standard 24.

5. Chemical reagent testing

Special identification solution (such as copper sulfate or 316L detection solution) is dropped onto the surface to determine the authenticity of the material through color changes.