Yes- AISI 1040 and AISI 4140 steels both have 40 points of carbon--chrome and moly and nickel compose the 41 of the 4140 analysis. There is tensile strength, but also the yield/bursting strength of barrel steels. My 1930 12 gauge NID 2E has the LLH barrels- but strangely, no stamping of the top of the barrels at the breech, nor anything on the top rib either--
Interesting perhaps, that the first 2 digits as marked on AWS stick electrodes, ie: 6011-- designate the tensile strength of the weld- after stress relieving- 60,000 psi tensile strength-
RWTF
