Remington called their Bessemer steel 'decarbonized', as did Parker Bros. briefly until Remington took offense
and changed the name to Plain Steel. Check out p. 503 & 504 of "The Parker Story"
1872 catalog
For your interest, tensile strength testing:
A sample of Twist and Damascus - 54,000 psi
Bessemer, Plain, or Remington Decarbonized Steel: Henry Bessemer initially claimed a tensile strength of 40 tons/89,600 psi but published numbers range from 55,000 to 70,000 psi, with an average of 63,000 psi
AISI 1018 Low Carbon (Mild) Steel: 64,000 psi
Whitworth's Fluid Compressed Steel: 66,000 - 67,200 psi
AISI 1140 Carbon Steel: 85,000 psi
AISI 4140 Chrome-Molybdenum Steel: 95,000 - 100,000 psi
Remington Ordnance Steel, introduced in 1897 for the 1894 Hammerless Double: 110,000 psi
This of course does not imply that your gun is safe to shoot.