Steel type and hardness for choke tubes

akajun · Aug 9, 2018

I’m wanting to experiment with some choke tube designs and was going to turn my own. I see a few custom manufactures use 17-4ph for tubes but don’t know the hardness/condition.
Also I have some older guns with factory tubes that are carbon steel. Would I be correct to assume these are standard 4140ph 28-32rc like the barrels?

johnoder · Aug 9, 2018

Briley for years bought 17--4 PH H1025 or H1100 for related parts like chambers for the skeet tube sets

This was way before becoming a big outfit with dozens of employees

mhajicek · Aug 9, 2018

I make surgical implements from 17'4 H900, which is it's hardest and strongest condition and what I would recommend. Cuts with a nice finish.

akajun · Aug 10, 2018

Would it in is h900 condition not be too brittle to handle the shock of heavy steel or tungsten shot loads

RWO · Aug 10, 2018

17-4PH at H1025 is about RC 38 and machines nicely.

RWO

mhajicek · Aug 10, 2018

akajun said:
Would it in is h900 condition not be too brittle to handle the shock of heavy steel or tungsten shot loads

Nope. It's extremely tough. H900 is around HRC 45.

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Steel type and hardness for choke tubes

akajun

Stainless

johnoder

Diamond

mhajicek

Diamond

akajun

Stainless

RWO

Cast Iron

mhajicek

Diamond

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