1018 surface hardness

[kmanuele]

I've noticed that pieces made with 1018 are easily marked up or scratched in use - inserting in chucks or collets, or just general handling.

Attached photo of two 3/4" shanks made from 1045 (top) and 1018. 1045 is like new.

I presume this is due to hardness? Brinell 180 vs 125, respectively. Are there other properties that might be in play here?

 

[MrWhoopee]

	1018	1045
Tensile Strength	64,000 psi	91,000 psi
Yield Strength	54,000 psi	77,000 psi
Elongation in 2″	15%	12%
Reduction in Area	40%	35%
Brinell Hardness	126	179

1018 vs. 1045 Steel Comparison - Capital Steel

Carbon steel is one of the most widely used materials in the world, and the 1018 and 1045 grades of steel is a big reason for that. One of the most common questions that arise when considering buying cold finished steel products is the difference between 1018 cold steel bars and 1045 cold bars...

capitalsteel.net