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What could be the reason for using

What could be the reason for using

What could be the reason for using

What could be the reason for using SAE 1141 grade steel in Railway engines - parts such as rocker arm and valve bridge? since it has an ideal diameter around 2 inches, is it possible to get martensitic structure at the core in a section 1 1/2 inch diameter and height 2 inches?

RE: What could be the reason for using

Machineability and heat treatment response because of manganese. You need to look up the hardenability curve for this material.

RE: What could be the reason for using

You may not want to get a through-hardened structure though, as the residual stress associated with the phase change to martensite could result in a longitudinal zipper crack running from sulfide to sulfide to relieve the stress. I do not recommend this and would suggest, if possible, using a medium or low-alloy nonresulfurized steel instead.

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