There isn't a different in A36 steel and 44W steel grade 300w. The 44W is the Canadian version of America's A36. Both are a mild steel.
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A36 steel is a standard mild steel grade with a minimum yield strength of 36,000 psi, while 44W/300W is a Canadian steel grade with a minimum yield strength of 44,000 psi. The main difference lies in the yield strength, with the 44W/300W grade being stronger and more suitable for structural applications that require higher strength.