properties of SS400 and S355 KT-20

[davidnamon]

i am trying to calculate the retired thickness of inserviced rectangular tank but very hard to find out the properties of SS400 and S355 KT-20 for maximum allowable stress(s) in ASME IID. what is the steel grade in ASME or ASTM can match with these two steels for their propeties to service at the temp around 120F

 

[stanweld]

SS400 is equivalent to A-36.