How to judge the performance of seamless steel tube?

The properties of seamless tubes include yield point, tensile strength, hardness index, reduction of area, and elongation after fracture.

1. Yield point
For metal materials with yield phenomenon, the stress at which the sample can continue to elongate without increasing the force (keep constant) during the stretching process is called the yield point. If the force drops, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa).

2. Tensile strength

The stress (σ) obtained by dividing the force (Fb) that the sample bears when it is broken by the original cross-sectional area (So) of the sample during the stretching process is called the tensile strength (σb), and the unit is N /mm2 (MPa). It represents the ability of metal materials to resist damage under tension.

3. Hardness index
The ability of metal materials to resist the indentation of hard objects on the surface is called hardness. According to different test methods and scope of application, hardness can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness.

4. Reduction of area
In the tensile test, the percentage of the reduction of the cross-sectional area at the reduced diameter of the sample after the sample is broken to the original cross-sectional area is called the reduction of area.

5. Elongation after break

In the tensile test, the percentage of the increased length of the gauge length after the sample is broken to the original gauge length is called elongation.

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