ASTM A572 Grades

A572 Mechanical Requirements
Grade Yield, min ksi Tensile, min ksi Elongation, min % in 8” Elongation, min % in 2”
50 50 65 18 21
55 55 70 17 20
60 60 75 16 18
65 65 80 15 17

A572 Chemical Requirements
Alloy Group Maximum Diameter, inches Carbon, max% Manganese, max% Phosphorus, max% Sulfur, max% Silicon, max%
50 4 0.23 1.35 0.04 0.05 0.4
55 2 0.25 1.35 0.04 0.05 0.4
60 1/1/2004 0.26 1.35 0.04 0.05 0.4
65 1/2 to 1-1/4 0.23 1.65 0.04 0.05 0.4
65 Below 1/1 0.26 1.35 0.04 0.05 0.4

This abridged table shows only the chemical requirements for bars. The complete table including shapes and plates can be found in the ASTM standard at www.astm.org

In addition to the chemical requirements above, the material shall also contain enough alloying elements to meet the requirements of one of the below alloy types.


Alloy Content
Type Elements Heat Analysis, %
1 Columbium 0.005 – 0.05
2 Vanadium 0.01 – 0.15
3 Columbium 0.005 – 0.05
Vanadium 0.01 – 0.15
Columbium plus Vanadium 0.02 – 0.15
5 Titanium 0.006 – 0.04
Nitrogen 0.003 – 0.015
Vanadium 0.06 max

All information derived from globally recognized specifications, subject to change, user discretion is advised.