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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: MOP steel
Date: Sun, 22 Jun 2025 07:17:08 -0400
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https://en.wikipedia.org/wiki/Eglin_steel
Yield is around 200,000 PSI, exceeding a Grade 8 bolt at 150,000 PSI. It 
accomplishes its strength with only 5% Nickel and lower amounts of other 
valuable metals, so the ingredients are cheaper than stainless and 
processing doesn't require a vacuum furnace except to achieve the highest 
properties.

The compressive strength of granite is given as up to 45,000 PSI. Single 
point carbide tipped chisels are recommended to carve it, carbon steel 
chisels for other types of stone dull in seconds on it. The rock drill rod I 
turned the jack adapter from is a broken and discarded end with the 3" drill 
bit still on. 1/2" carbide buttons worn hemispherical do the 
cutting/pulverizing, with compressed air removing the dust.

"Eglin steel can be welded easily" but machinability isn't mentioned. HSS 
cuts Grade 8.