A36 steel plate is similar to Q235B steel plate, it is one Q235b equivalent steel.While the difference between A36 and Q235B is as follows:  


· Different Yield Point (A36=250MPa, Q235B=235MPa);


· Different Tensile Strength (A36=400-550MPa, Q235B=375-500MPa);


· Different element content requirements:  (A36: C is equal to or less than 0.25%, Si is less than or equal to 0.4%, P < 0.04%, s is less than or equal to 0.05%; Q235B:C=0.12-0.2%, Si is less than or equal to 0.3, P < 0.045%, s is equal to or less than 0.045%).Q235 manganese content of the requirements (Mn=0.30-0.70%) A36 manganese content is not required.


If only compare the mechanical properties of these grades, it is found that the mechanical properties of A36 and high quality carbon structural steel 20# are quite similar to each other. Tensile strength of 20# steel is not less than 410, yield strength is not less than 245, and mechanical properties of A36 are about the same.

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