What is the minimum tensile strength of steel conforming to ASTM A 572, Grade 65?

The minimum tensile strength of steel conforming to ASTM A 572, Grade 65, is specifically set at 65,000 psi. However, to identify the appropriate choice from the provided options, it's crucial to note that ASTM A 572 is a specification for high-strength low-alloy structural steel. Grade 65 is one of the higher strength grades within this specification, which means it is designed to achieve significant strength and performance in structural applications.

Options provided quote minimum tensile strengths that correspond to different grades of steel. For instance, while Grade 60 has a minimum tensile strength of 60,000 psi and Grade 70 has a strength of at least 70,000 psi, the correct value for Grade 65 aligns with 65,000 psi, which can often be rounded or represented in larger increments as in option C. The tension strength does not reach the amounts stated in the higher options, such as 80,000 psi or 90,000 psi, which would belong to even higher grades or different specifications altogether.

Therefore, recognizing that ASTM A 572, Grade 65 signifies a specific performance characteristic allows for understanding that the right answer is indeed referencing a minimum tensile strength that accurately reflects the capabilities of that steel grade.