Astm 307

No alloying elements are required; the steel is plain carbon, often AISI 1006–1022 grade.

| Grade | Description | Typical Use | |-------|-------------|--------------| | | Low carbon steel (no heat treat required). Soft, ductile, and easily bendable. | General purpose fasteners, pipe flanges, electrical conduits, anchor bolts. | | Grade B | Low carbon steel (may be heat treated). Slightly higher strength and hardness. | Flanged joints in piping systems (especially cast iron flanges), mild machinery assembly. | | Grade C | (Rarely used/obsolete) | Replaced by F1554 for anchor bolts. | astm 307

The specification is divided into three distinct grades, each serving specific industrial needs: No alloying elements are required; the steel is