I’m wary of turn-of-the century fluid steel tubes. It is one thing to label steel produced in 1908 as 1030 or 1035, another thing entirely to have confidence in the skill of who produced it (see Titanic).

Seeing that 1040 alloy steel was showing up in the mid 1920s demonstrates better quality materials and more advanced production techniques had been developed with time.

Interesting, as always, Drew.

Best,
Ted