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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
action and barrel coating
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<blockquote data-quote="Canadian Bushman" data-source="post: 924675" data-attributes="member: 41122"><p>Many times when actions and bolts are made from the same material they will use two different temper's to resist galling. This applies to the majority of alloys ferrous or non.</p><p></p><p>Overall tensile properties arent really a considerable factor between stainless and chromoly because most manufacturers run mild tempers to get better toughness instead of hardness. They dont want either to fracture during the mild streching that takes place during firing. </p><p></p><p>At maximum tensile 17-4 and 416 will loose out to 4140 and 4130 by about 30-60k lbs, but i dont think any manufacturer is using these metals at the tempers required for those numbers. If tensile was a concern there are metals out there that could be used to trump all the above. </p><p></p><p>Often times stainless is easier to leave a nice finish on then chromoly and its resistance to corrosion is why i, personally, think custom action and barrel makers prefer to use it. I know i personally would rather cut 17-4 over any carbon based steel any day of the week. Im actually cutting 17-4 DH1150 right now as we speak. </p><p></p><p>Also QPQ ( quench polish quench ) is a very common stainless surface treatment that also somewhat acts as a case hardening further reducing galling and corrosion. This is very popular with stainless parts of all kinds including actions.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 924675, member: 41122"] Many times when actions and bolts are made from the same material they will use two different temper's to resist galling. This applies to the majority of alloys ferrous or non. Overall tensile properties arent really a considerable factor between stainless and chromoly because most manufacturers run mild tempers to get better toughness instead of hardness. They dont want either to fracture during the mild streching that takes place during firing. At maximum tensile 17-4 and 416 will loose out to 4140 and 4130 by about 30-60k lbs, but i dont think any manufacturer is using these metals at the tempers required for those numbers. If tensile was a concern there are metals out there that could be used to trump all the above. Often times stainless is easier to leave a nice finish on then chromoly and its resistance to corrosion is why i, personally, think custom action and barrel makers prefer to use it. I know i personally would rather cut 17-4 over any carbon based steel any day of the week. Im actually cutting 17-4 DH1150 right now as we speak. Also QPQ ( quench polish quench ) is a very common stainless surface treatment that also somewhat acts as a case hardening further reducing galling and corrosion. This is very popular with stainless parts of all kinds including actions. [/QUOTE]
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