Paris law cofficients of 20MnMoNi55 steel or SA508 steel

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If any body knows the Paris Constants 'C' and 'm' for either 20MnMoNi55 or SA508 steel at room temperature and in air environment, please hep me out.
 

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Astronuc
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If any body knows the Paris Constants 'C' and 'm' for either 20MnMoNi55 or SA508 steel at room temperature and in air environment, please hep me out.
Apparently C and m will vary with composition and microstructure, and impurity levels.

Here is some discussion regarding SA508
https://opus.lib.uts.edu.au/research/bitstream/handle/10453/13663/2006013063.pdf?sequence=1 [Broken]
 
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