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mso-fareast-font-family:"Times New Roman"">I’ve once again reviewed my materials
specifications.

mso-fareast-font-family:"Times New Roman"">For steel plates can I substitute
ASTM A572 grade 50, or ASTM A A572 Grade 50 KSI Max. for ASTM A36?

mso-fareast-font-family:"Times New Roman""> 

That would largely depend on the application. A36 has lower specified yield and tensile strength and marginally higher elongation. For almost all structural applications, I don’t see any issues unless you desired a lower strength or slightly higher ductility. There may be some applications where this is necessary, for some kind of fracture critical or energy absorbing component.

Thanks