Important technical terms
With the technological test procedures, predominantly characteristic values are determined, which depend on the type of sampling. Mostly it is their task to determine the suitability of preliminary products, especially semi-finished products, for further processing. With one part of these test procedures also the applicability of production procedures is examined. Beside the extension test, the flattening test on tubes, the ring tension test and the flaring test, which are executed at SBER, there is a large number of non-standardized tests to meet the requirements of special production procedures. The results of the tests are either numerically reportable characteristic values or simple Yes-No-statements.
For the tensile test, a tension sample is expanded until fracture while the required tension force as well as the sample elongation is measured. The tensile test serves the determination of characteristic material values like yield limit, tensile strength, fracture elongation, etc.
Tension test machine
The tensile test can be performed on a tension test machine. The most important components of the tension test machine are the straining facility (application of the tensile strength) and the measurement facility (for the test force as well as sample extension). Due to the accuracy of the force measurement facility, the tension test machines are classified in various classes.
The respectively required test pressure and/or the required holding period for the execution of a water pressure test, are predetermined by the respective standard. For the internal pressure test according to DIN 50104, executed for testing tightness, the test pressure is 50 bars and is to be maintained for at least 5 seconds.
Test route card
In the test route card all test steps, their execution (standard) as well as the test scope are listed exactly.
Determination, whether a test object (e.g.: tube) has the required features, i.e. fulfills one or several agreed, determined or expected conditions (e.g.: predetermined error limits, tolerance, etc.). Testing can take place subjectively by sensory perception (visual inspection) or objectively with measuring or test devices and take place at each individual component (test by the piece) or on a random basis.
Is a procedure or the combination of procedures, in which a work-piece in the solid state is subject to temperature changes, to achieve certain material properties, like e.g.: improvement of machinability, increase or decrease of strength, elimination of residual stresses, etc.
Is the difference between the admissible maximum and the admissible minimum of a measurement quantity, i.e. margin, in which the finished dimension (actual dimension) of a work-piece may deviate.
Tolerance standards define the difference between the admissible maximum and the admissible minimum of a measurement quantity like e.g.: outside diameter and/or wall thickness. Important tolerance standards for seamless stainless steel tubes: DIN EN ISO 1127, ASTM A450/A530, DIN 2391.
Team-oriented process optimization with the target to improve the profit situation of SBER by innovation and additionally develop a modern, employee-oriented company culture.
Temperature, at which in the notched bar impact test the transition from a ductile to a brittle fracture indicates. Above the transition temperature brittle fractures are not to be expected, below cleavage fractures have to be reckoned with.
Abbreviation for "Technischer Überwachungs-Verein" [German Technical Control Board]. The TÜV is a neutral self-help facility of the economy with the task to protect people, environment and goods from adverse effects of technical plants or facilities. An examination of products, plants, etc. can be determined by law and regulation, but also by customer requirement.