Seamless tube process performance testing method

Seamless tubes are divided into two types: hot-rolled (extruded) seamless steel tubes and cold-drawn (rolled) seamless steel tubes due to different manufacturing processes. Cold drawn (rolled) tubes are divided into two types: round tubes and special-shaped tubes. Seamless pipe process performance inspection can be carried out through four aspects: liquid (water) pressure test, flattening test, bending test, and flaring test, to test the suitability of the steel pipe's own quality in the subsequent processing and manufacturing process. Commonly used process performance tests include water pressure, flattening, bending, and expansion tests. The following carbon steel tube manufacturers share these knowledge points with you.

1. Hydraulic (water) pressure test
Water of a certain pressure is poured into the tested steel pipe and the pressure is maintained for a certain period of time (the test pressure value and pressure stabilization time are determined according to the standard), and there is no leakage. This test is a non-destructive test and is commonly used for complete inspection of products.

2. Flattening test
Place the steel pipe sample between two flat clamps, apply force between the clamps until the distance reaches the standard value, and check that there are no cracks, cracks or other defects in the deformation area of the sample.

3. Bending test
Place the steel pipe sample on the bending testing machine and bend it to the angle required by the standard according to the bending core radius specified in the standard. There should be no defects such as cracks or rips on the surface at the bending position.

4. Expansion test
Place the steel pipe sample on the work surface with the opening upward, and press the top center selected according to the taper specified by the standard into the steel pipe until the test outer diameter expansion rate reaches the standard and there are no defects such as cracks or cracks on the surface of the sample.