Structural Steel Composition The following is the composition of two well-known grades of structural steel: ASTM 572 and ASTM A36. While other structural steel grades possess analogous compositions, ...

Officials say the I-64 bridge in Grayville has ASTM A36 steel and ASTM A441 steel, and the Mt. Carmel bridge has AASHTO M270 Grade 50W and Grade HPS 70W steel. This is what those types of steel are: ...