Important technical terms

NCR
The NCR (=Non-Conformity Report) is a deviation report, which is issued due to a detected system deviation during an internal system audit.

Neutral fiber
During bending, the external fibers of the work-piece are stretched, the internal ones, however, are upset. Between them there is a fiber, which remains unstressed, whose length does not change during bending. It is called neutral fiber.

New production item
That is an item, which is not stocked in the tube center store and therefore has a substantially longer delivery time. Each item is clearly allocated a certain product (dimension/material).

Non-destructive testing
Generic term for all material tests, which detect material irregularities without damaging the work-piece. Thus qualitative but no quantitative statements can be made about defects. For detection of surface defects, penetration methods (color penetration test) and magnetic powder testing methods are applied. Defects in the interior of the work-piece are detected by means of irradiation methods (X-rays or gamma ray), through transmission methods (ultrasonic testing, eddy current test) as well as by means of electric methods (eddy current test).

Notched bar impact bend test
Method for the qualitative determination of the fracture behavior of a work-piece. A notched bar with a square cross section, which is placed on two supports, is smashed with a Charpy hammer. The impact energy absorbed is measured and results in the notch impact energy. The samples utilized receive the designation Charpy-V or Charpy-U sample according to the shape of the notch - pointed or round.