The ASTM F1554 specification was introduced in 1994 and covers anchor bolts designed for anchoring structural supports to concrete foundations. F1554 anchor bolts can come in the form of headed bolts, straight rods, or bent anchor bolts. The three grades 36, 55, and 105 denote the minimum yield strength (ksi) of the anchor bolt.
The ASTM A193 specification was initially approved in 1936 and is a chrome-molybdenum alloy steel. B7 grade achieves its strength through a heat-treating process where it is quenched and tempered at 1100 degrees F. For high-temperature applications, B7 grade alloy is highly sought after due to its tensile strength and excellent heat resistance. It is widely used in the oil and chemical construction applications.
The main difference between ASTM F1554 Grade 55 and ASTM A193 Grade B7 is that Grade 55 is more ductile than Grade B7 but is still suitable for high-strength applications. ASTM A193 Grade B7 has a minimum tensile strength of 125 ksi, while F1554 Grade 55 has a maximum tensile strength of only 95 ksi. Additionally, B7 is not weldable.