Decarbonized steel or "Bessemer process homogenous wrought iron" was sourced from Remington Arms. Pages 503 & 504 of "The Parker Story" state that Parker changed the name to "Plain Steel" as Remington was using the name "Decarbonized" on their newly introduced Model 1873 & 1875/1876 Hammer Lifter doubles.
889 guns were made marked "Decarbonized Steel".
Decarbonized tensile strength is a bit more than pattern welded barrel steel, about the same as AISI 1018 Low Carbon (Mild) Steel, and considerable less than AISI 1040 or modern 4140 chrome moly steel.
The tensile strength could be increased by "cold rolling"; ie. Winchester Standard Ordnance Rolled Steel.
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