I was off by a factor of 10 for stess in my calculations. So 500 not 50 MPa.
The units are now fixed but still the large problem of difference in the graphs.
The difference was also immediately noticed when testing by the automatic graphing the testing program has, meaning it did not come from...
Tensile tested 2 samples of 1018 unheat treated carbon steel, assumed to be very similar steel (bought from same place, same order, ect) but very different tensile test results.
The results of the tensile test can be seen below as well as a few calculated values. I do not know what this would be...