Improve the Accuracy of Spiral Steel Pipe Wall Thickness

Spiral pipe quality has always been subject to focus attention of the masses, for the detection process, the most important is the spiral pipe application performance Bale.

Spiral pipe bending point refers to the phenomenon of metal material having a yield, the degree of bending of the sample is very important in the spiral pipe forming the initial time, because it can test out the DSAW steel pipe subjected to external pressure when the reaction, if the pressure test of the spiral steel pipe the critical point, according to customer requirements can be appropriately reinforcing spiral pipe to greater affordability.

When the solenoid drop occurs, it should distinguish between the lower yield point. The yield point and the yield stress is the maximum force before the first drop of the sample occurred; lower yield point refers to when excluding the initial transient effects, the yield phases of minimum stress. Hardness index mainly metal materials ability to resist a hard object surface indentation, known as hardness.

Depending on the test methods and scope, it can be divided into Brinell hardness spiral, Rockwell hardness, Vickers hardness, Shore hardness, micro hardness and high temperature hardness. Commonly used for carbon steel pipe Brinell, Rockwell, Vickers hardness of three.