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ASTM A572 Fasteners

ASTM A572

Scope

ASTM A572 covers five grades of high strength, low-alloy structural steel shapes, plates, and bars. All grades are intended for riveted, bolted, or welded structures, with the exception that grades 60 and 65 are not intended for welded bridge applications.

Mechanical Requirements

Grade Yield, min ksi Tensile, min ksi Elongation, min % in 8” Elongation, min % in 2”
42 42 60 20 24
50 50 65 18 21
55 55 70 17 20
60 60 75 16 18
65 65 80 15 17

Chemical Requirements

Grade Maximum Diameter, inches Carbon, max% Manganese, max% Phosphorus, max% Sulfur, max% Silicon, max%
42 6 0.21 1.35 0.04 0.05 0.40
50 4 0.23 1.35 0.04 0.05 0.40
55 2 0.25 1.35 0.04 0.05 0.40
60 1-1/4 0.26 1.35 0.04 0.05 0.40
65 ½ to 1-1/4 0.23 1.65 0.04 0.05 0.40
65 Below ½ 0.26 1.35 0.04 0.05 0.40
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

Alloy Content

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.

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

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