EN 10269 Standard - Minimum Tensile Strength Values

[DCX_2156]

Hi,

I need help with interpretation of the EN-10269 standard in terms of the material properties.

I require the minimum tensile strength of the superalloy material, X6NiCrTiMoVB25-15-2 (1.4980) at 200 degC. Now the standard, provides values from 400 degC (720 MPa) onwards but leaves the 50 degC to 350 degC fields blank.

I am not sure if the blanks means that test data at those temperatures are simply not available or if its that the tensile strength from 50 to 400 degC should be assumed the same? I note that at room temperature (20 degC), the stated tensile strength is 900-1150 MPa. There's no explicit explanation of the blanks within the code hence the confusion. In some instances, they mention that values were derived from linear interpolation but it was not done in this case. In addition, they have data available for the material's 0.2% proof strength for the full range of temperatures (50degC to 650 degC) hence its weird that they dont have it for minimum tensile strength.

If I interpolate from what data is avaialble, assuming a logarithmic function, I get a value of about 755 MPa at 200 degC.

Please can anyone provide guidance on how to interpret the blanks or a more suitable way of deriving the tensile strength value at the elevated temperature of 200 degC?

The data for this material is available in:

https://torqbolt.com/en-10269-x6nic...ers#x6nicrtimovb25-15-2-mechanical-properties

Kind regards,
DDC

 

[saplanti]

That means the economical use of this material mostly above 400 degre C. You may be able to use cheaper materials at lower temperatures.

If you must to use this particular material you may be forced to use 400 degree values at liwer temperatures unless there is clear instructions available.

 

[geesaman.d]

755MPa is extrapolating, not interpolating. The codes I've worked with only allow interpolation. 200C for this material is not considered an elevated temperature.

Up to 400C your min tensile strength is 720MPa.