User Panel
User Panel
User Panel
|
Posted: 8/15/2024 8:52:14 PM EST
I noticed a lot of trigger groups are made of s7, whereas i have recently been working with 316 and making parts such as a safety selector
comparing properties such as on "Make if from".com they seem REALLY similar and i'm wondering if there would be any reason to be concerned about longevity of 316 interacting with s7 https://www.makeitfrom.com/compare/AISI-316-S31600-Stainless-Steel/SAE-AISI-S7-T41907-Shock-Resisting-Steel specifically for hardness On the Brinell hardness scale 316 stainless steel plate has a hardness of 217 and a Rockwell B hardness of 95. regarding S7 i found an article about annealing; ... This annealing procedure should produce a hardness of Brinell 197 max so as far as I can determine the 316 is harder than the S7 but they are both pretty f'ing hard. any machinists with experience have any input that might help ? just dont want them eating into each other with any rotational wear. |
|
|
|
|
Posted: 8/15/2024 9:28:57 PM EST
[#1]
S7 tool Steel has higher shock and impact resistance, machines better than 316
|
|
|
|
MN, USA
|
Posted: 8/15/2024 10:01:58 PM EST
[#2]
OIL??
|
|
|
|
Posted: 8/15/2024 10:33:21 PM EST
[#3]
I think they can mim S7 so just saying S7 doesn't mean much to me.
|
|
|
|
|
Posted: 8/16/2024 6:11:28 AM EST
[#4]
Quote HistoryOriginally Posted By j3_: I think they can mim S7 so just saying S7 doesn't mean much to me. Anderson triggers are MIM S7. |
|
|
|
|
Posted: 8/16/2024 6:28:48 AM EST
[Last Edit: bionicmonkey]
[#5]
Quote HistoryOriginally Posted By s4s4u: OIL?? well duh yeah i would use oil, lol. but there would be rotation and camming. it sounds like overall it may not be that big a difference overall. and to JB's point, S7 is actually cheaper than 316. |
|
|
|
MN, USA
|
Posted: 8/16/2024 9:34:23 AM EST
[#6]
Quote HistoryOriginally Posted By bionicmonkey: well duh yeah i would use oil, lol. but there would be rotation and camming. it sounds like overall it may not be that big a difference overall. and to JB's point, S7 is actually cheaper than 316. Point is, I think you are over-thinking this. We have steel and aluminum cycling at high velocity only protected by a thin coat of ano and some oil. A little difference in BRN isn't going to matter much, IMO. |
|
|
NY, USA
|
Posted: 8/16/2024 9:42:34 AM EST
[#7]
Annealing is a softening process, not hardening.
|
|
|
AZ, USA
|
Posted: 8/16/2024 10:08:37 AM EST
[Last Edit: brownbomber]
[#8]
316 is a tough, ductile, gummy austenitic stainless steel that is not hardenable via hear treatment - only by deformation (strain hardening).
S7 is a 0.5% carbon air-hardening tool steel. It is "shock resistant," indicating that it has a high toughness, however, there is a major caveat: its maximum (and completely unimpressive) Charpy V-Notch impact toughness of 12-16ft lbs is achieved at a 400F temper, corresponding to a hardness of 57HRC. In my opinion, this is too low to be used for parts that have sharp internal corners. It's Charpy C-Notch and U-Notch figures are much more impressive, and the maximum values are achieved at a higher tempering temperature and lower hardness. I would not choose either material to make fire control components. |
|
|
OH, USA
|
Posted: 8/17/2024 2:57:28 PM EST
[#9]
316 is great material , just not for most gun parts.
Prior employment we made a LOT of parts for the food and drug industries and 316 was used in most applications. S7 is a tool steel and has far better wear properties and impact resistance. |
|
|
NC, USA
|
Posted: 8/20/2024 6:05:07 PM EST
[Last Edit: lysanderxiii]
[#10]
Originally Posted By bionicmonkey: I noticed a lot of trigger groups are made of s7, whereas i have recently been working with 316 and making parts such as a safety selector comparing properties such as on "Make if from".com they seem REALLY similar and i'm wondering if there would be any reason to be concerned about longevity of 316 interacting with s7 https://www.makeitfrom.com/compare/AISI-316-S31600-Stainless-Steel/SAE-AISI-S7-T41907-Shock-Resisting-Steel specifically for hardness On the Brinell hardness scale 316 stainless steel plate has a hardness of 217 and a Rockwell B hardness of 95. regarding S7 i found an article about annealing; ... This annealing procedure should produce a hardness of Brinell 197 max so as far as I can determine the 316 is harder than the S7 but they are both pretty f'ing hard. any machinists with experience have any input that might help ? just dont want them eating into each other with any rotational wear. 316 stainless? That stuff does not get very hard, about HRb 95, or HRc 20 and it ain't supper strong. S7 can easily be air hardened to HRc 40 and will have twice the tensile strength of 316 . . . (If you want to make safety levers, use O-1 tool steel, or 4130 HT) |
|
|
|
Posted: 8/21/2024 9:53:50 PM EST
[#11]
Appreciate the input guys.
316 is way stronger than pa12cf and pla but ill look at a new material for the next version. |
|
|
|
AZ, USA
|
Posted: 9/8/2024 11:36:30 AM EST
[Last Edit: CAC01]
[#12]
S7 is only B90 unless you heat treat it. It's a cheap way into making crappy FCG components except for the disconnector.
|
|
|
|
Posted: 9/9/2024 1:43:50 AM EST
[#13]
Quote HistoryOriginally Posted By bionicmonkey: Appreciate the input guys. 316 is way stronger than pa12cf and pla but ill look at a new material for the next version. Check out PPA-CF |
|
|
|
|
Posted: 9/9/2024 7:26:37 AM EST
[#14]
Quote HistoryOriginally Posted By CAC01: S7 is only B90 unless you heat treat it. It's a cheap way into making crappy FCG components except for the disconnector. haven't cut into my MBT for the super safety yet but that will tell the tale if it's hardened or not. |
|
|
|
|
Posted: 9/9/2024 7:40:07 AM EST
[#15]
Quote HistoryOriginally Posted By chevrofreak: Check out PPA-CF ok, not going to lie, that does look interesting. but $200 a roll still pretty spendy. |
|
|
|
|
Posted: 9/9/2024 7:49:06 AM EST
[#16]
If you want to look into a really interesting material, look at 17-4 PH. It's a hardenable stainless steel with impressive strength and corrosion resistance properties. It can also be 3D printed.
|
|
|
|
|
Posted: 9/10/2024 9:30:15 AM EST
[#17]
Quote HistoryOriginally Posted By bionicmonkey: ok, not going to lie, that does look interesting. but $200 a roll still pretty spendy. Bambu Lab should have a 750g spool of it back in stock for $100 in a week or so. |
|
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
