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44 ksi Steel used in Canada ?

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I am working on a project that involves a chemical plant in West Hill, 
Ontario. In a 1975 report, the engineer says the structural steel  used has a 
yield of 44,000 psi. Is there a grade of steel used there with this minimum 
specified yield, or I am wondering if it is A36 and he is giving the tested 
yield? 

There is also a beam identified as 15 x 5-1/2 I 42.9 and one that is        
18 I @ 54.7 with section modulus stated as 89.3. I don't see anything exactly 
like that in the AISC. Are these Canadian sizes ? 

Thanks,

Jim Fulton