For products made of spheroidal graphite cast iron the tensile strength shall be measured in accordance with EN 598:2007+A1:2009, 6.3. For products made of grey cast iron or any other type of cast iron the determination of tensile strength shall be carried out in accordance with 2 or 3.
Define tensile strength on grey cast iron pipes and fitting
1. Samples
In order to obtain results which are as representative as possible of the finished products, the tensile tests shall be performed on samples: either taken from SML pipes or cast iron pipe fittings. The sample shall then be cut parallel with the axis of the pipe or fitting; or only for fittings, from separately cast test pieces, cast at the same time as the fittings.
The test piece cut from the sample shall be in accordance with Figures, and if coming from separately cast test pieces, can be flat rather than curved
2. Equipment and Test Method
The testing machine shall have appropriate equipment to permit the application of the test force without slip.
The testing machine shall be able to develop a force which is sufficient to break the test pieces whilst indicating the load applied.
The accuracy of the testing machine shall be in accordance with EN IS0 6892-1:2019, Clause 9.
The speed of load application shall be as constant as possible in accordance with EN IS0 6892-1:2019, Clause 10.
The tensile strength shall be calculated by dividing the force indicated at rupture by the area of the initialcross-section of the test piece. The cross-section (width and thickness) shall be measured with an accuracy of 0,1 mm before the test.
3. Validity of Tensile Strength Tests
The test is declared valid if the following conditions are fulfilled:
- for pipes: the average of three values taken on one day’s production shall be at least 200 MPa and atmaximum one value may be between 180 MPa and 200 MPa;
- for fittings: all values shall be at least 150 MPa
Tensile Test Results
Click to view What Is EN13501-1:2018 (DS SML PIPE A1)
Post time: Jul-28-2025
