About 1075|High-carbon steel (0.75% carbon). Spring steel territory. Can be hardened to HRC 55-60 with good edge retention and spring properties. Harder to machine than medium-carbon grades and requires preheat for any welding. Used for springs, agricultural blades, hand tools, and wear parts. Machines best in the annealed or spheroidized condition. Compare to
1095 (even higher carbon, harder, more brittle) and
1045 (lower carbon, easier to weld, less hardenable).