ASTM A131
The ASTM A131 specification is the Standard Specification for Structural Steel plates primarily used in ship construction. Steel grades covered in this specification require CVN Impact testing and are classified by minimum Yield Strengths. Grades classified as Ordinary Strength have a minimum Yield Strength of 34 ksi and grades classified as Higher Strength have a minimum Yield Strength of 46 ksi. The Condition of Supply is determined by the ordered thickness and product type ( plate, shapes and bars).