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Old 10-20-2008, 09:40 AM   #1 (permalink)
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Post SOME FIREARMS STEELS

Thought this might be of help to you guys.

Manufactures have literally dozens of steels to choose from, depending on cost, and suitability for specific purposes.

AISI 1018 low carbon steel (also known as mild steel) - Non critical parts such as hardware, buttplates, barrel bands, sights.
AISI 1040 medium carbon steel- A low-cost heat treatable steel for applications that require greater strength than mild steel. Typical applications would be parts that need wear resitance, levers, screws.
AISI 4140 chrome-moly steel- A high-strength heat-treatable steel especially useful for barrels and sometimes for low stressed receivers (.22rimfire and other low pressure cartridge guns).
AISI 8620 alloy steel- Commonly known as ordnance steel, it is often used for high-strength firearm receivers and bolts. May be case-hardened for a high surface hardness while still retaining a tough and strong core.
AISI 1095 high carbon steel- especially suited for springs.
AISI 400 series (416,440,410, etc.) Heat-treatable and high-strength stainless steel used in barrels and receivers.
AISI 300 series (303, 304, etc.) - Non heat-treatable stainless steel for low-stressed parts, easier to machine than 400 series.
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Old 10-20-2008, 10:43 AM   #2 (permalink)
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4130 heat treatable, increased strength over low carbon steel and is readily weldable unlike 4140 and other stronger steels
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Old 10-20-2008, 11:09 AM   #3 (permalink)
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4140 is weldable (if not pre-heat treated), but it does alter it somewhat as well as creating a weak-point.
4130 is a great steel that's also heat treatable, but not as strong...

I like to get 4140 - you can buy it pre-heat treated to a good Rockwell hardness, that is not only 'acceptably' machinable, but also makes for some VERY nice pistol-caliber bolts & trunions in home-built guns.
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