Short version is that AISI 1020 Low Carbon Steel, Siemens (Open Hearth) Low Carbon Steel, and Decarbonized or Plain Steel were similar in strength. "Rolled" Decarbonized was slightly higher; ie Marlin Special Rolled Steel and Winchester Standard Ordnance Rolled Steel.
All ARE slightly higher in tensile strength than Crolle or Twist.

Everything changed with the introduction of Krupp Fluss Stahl in 1891, higher carbon steels (1030 & 1040), and the rapid development of steel alloys thereafter.

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