For steel identified as SAE 1020, the first two numbers (10) identify the type of steel and the last two numbers (20) specify the approximate amount of carbon in hundredths of a percent (0.20% carbon).

Question

Quizplus · Accepted Answer

This is correct. SAE 1020 steel has approximately 0.20% carbon, which is identified by the last two numbers in its designation. The first two numbers in the designation indicate the type of steel.

For Steel Identified as SAE 1020, the First Two Numbers