New Macalloy 1050 Post Tensioning Bar is launched - 07/01/2009
Wed, 07 January 2009
As part of our continual product development programme, Macalloy have launched a diameter 29mm High Strength alloy steel bar for use in the Post Tensioning industry.
The bar is a carbon-chrome steel, designed to give the specified properties. The bars are hot rolled prior to supply and then are cold worked at Macalloy by stretching. The stretching load and permanent elongation are predetermined by calculation, drawing on the years of experience Macalloy have gained whilst producing the more familiar 1030 Post Tensioning System. During stretching the properties are closely monitored to ensure that the bars supplied comply with Macalloy’s quality standards.
A proprietary thread form is rolled on to the bars, thus the major diameter across the thread is greater than the bar diameter. The thread is coarser than that of a standard metric thread and as such not as prone to handling damage. The thread form complies with the requirements for a class 2 deformed bar according to BS8110:1997.
|
Mechanical Properties and Characteristic Loads |
|
|
Nominal Bar Diameter (mm) |
29 |
|
Nominal cross sectional Area (mm2) |
660 |
|
Mass (kg/m) |
5.45 |
|
Major diameter of threads (mm) |
33.8 |
|
Minimum hole diameter in steelwork (mm) |
38 |
|
Ultimate Tensile Strength (N/mm2) |
1050 |
|
0.1% Proof Stress (N/mm2) |
950 |
|
Minimum Elongation (%) |
6 |
|
Modulus of Elasticity (kN/ mm2) |
170 |
|
Characteristic Failure Load (kN) |
667 |
|
0.1% proof load (kN) |
603 |
|
Shear Capacity (kN) |
297 |
The bars are manufactured in accordance with European Standard prEN 10138 and BS 8110-1:1997. Currently the diameter 29mm bar is not part of Macalloy’s ETAG 013 but we are working towards adding it to the approved range.
For information, please contact the Macalloy Technical Department.
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