ISO 10544 pdf download – Cold-reduced steel wire for the reinforcement of concrete and the manufacture of welded fabric.
7 MechanIcal properties
7.1 Tensile properties
Required tensile properties are given in table 3.
At least 95 % of the population under consideration shall have tensile properties equal to or above the characteristic value specified.
No single test result shall be less than 95 % of the characteristic value given in table 3.
The ratio of tensile strength to proof stress, RmlRpo2, for each test piece shall be at least 1.03.
By agreement between manufacturer and purchaser, the values in table 5 may be used as guaranteed minimum values.
7.2 Bending properties
After testing, none of the test pieces shall show fractures or cracks visible to the naked eye.
7.3 Rebending properties
By agreement between manufacturer and purchaser, the rebend test may replace the bend test.
The rebend test is used to verify the ageing properties of bent wires.
After testing, none of the test pieces shall have fractures or cracks visible to the naked eye.
8 Testing of mechanical properties
The testing shall be done on wires in the straightened condition. The test piece may be heated to 100 °C and then cooled freely in air to the test temperature.
8.1 TensIle test
The tensile properties shall be determined according to Iso 6892. The test piece shall have an original gauge length of 5 times the nominal diameter. The free distance between the grips shall be not less than 180 mm.
For calculation of proof stress and tensile strength, the nominal cross-sectional area of the wire shall be used.
cnaser, 11.4 may e usea.
11.3 Verification of conformity
11.3.1 OrganIzation
The tests shall be organized and carried out according to an agreement between purchaser and manufacturer, taking Into consideration the national rules of the receiving country.
11.3.2 Extent of sampling and testing
For the purpose of testing, the delivery shall be subdivided Into test units with a maximum mass of 50 t or a fraction thereof. Each test unit shall consist of products of the same nominal diameter from the same cast. When required by the purchaser, the chemical composition (cast analysis) shall be stated In the test report.
Test pieces shall be taken from each test unit as follows:
a) two test pieces from different coils or straightened wires for testing the chemical composition (product analysis);
b) fifteen test pieces (if appropriate 60 test pieces; see 11.3.3.1) from different cods or straightened wires for testing all other properties specified in this International Standard.
11.3.3 Evaluation of the results
11.3.3.1 Inspection by variables
For properties which are specified as characteristic values, the following shall be determined:
a) all Individual values, x1, of the 15 test pieces (n= 15);
b) the mean value, rn15 (for n = 15);
C) the standard deviation, (for n = 15).
The test unit corresponds to the requirements if the condition stated below Is fulfilled for all properties.
ISO 10544 pdf download – Cold-reduced steel wire for the reinforcement of concrete and the manufacture of welded fabric
