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Old 10-26-2017, 07:24 PM   #1
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Default Nitride Service?

I made a gas block for my AR. I made it out of 01 tool steel.
I would like to get it black nitrided or melonited. Does anyone have a good source they use to get their parts done?
Here is a pic of the block:
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Old 10-26-2017, 07:51 PM   #2
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That looks pretty nice.
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Old 10-26-2017, 08:05 PM   #3
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Nice looking machining. Is that for a piston operated?

If I understand the nitride process correctly it's pretty high heat (1100į). What will that do to the O-1 material?
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Old 10-26-2017, 08:22 PM   #4
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Yes it’s for gas piston. I thought the temps were more around 800 to 900 degrees. Right now the 01 is at a Rockwell of about 20. Maybe I should just leave it as is? And I probably should have made it out of 4150 or something.
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Old 10-26-2017, 09:00 PM   #5
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There is a heat treat place near me.
This was from their web site:
Quote:
Superior Heat Treat LLC has developed a proprietary ferritic nitrocarburizing (FNC) process that exceeds the stringent ISO 9277, 300 hour salt spray test. This level of corrosion resistance is ideal for part applications where parts are subjected to difficult environments such as wind technology. This FNC process also creates excellent wear properties with surface hardnesses reaching 70 RC equivalent. Additionally, this process increases part lubricity. The relatively low temperature of this process promotes total dimensional stability and is generally accomplished on finished parts. Parts receiving Superior Heat Treat's FNC process come out with an attractive matte graphite finish.
I sent them an email but havenít gotten a reply yet. I think they want to deal with companies (large volume) not single parts.
It also said on their site that it would work on tool steels
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Old 10-26-2017, 09:24 PM   #6
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Impressive
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Old 10-27-2017, 05:29 AM   #7
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it will be about $100 to get that done. nitriding firms charge a minimum. why not just heat treat it and quench in oil and temper at 600 degrees? that will make that very strong. it would never wear out.
www.steeltreating.com
http://blacknitride.com/
both places are good
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Old 10-27-2017, 11:57 AM   #8
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Thanks for the links tim!
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Old 10-27-2017, 05:23 PM   #9
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np, 01 should do rather nicely regardless which direction you go (nitride or deep hardening)
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Old 10-27-2017, 06:58 PM   #10
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Nice work.
I agree that just hardening it will work well.

I have some no name piston drive AR and the block is not that hard .

AK blocks last forever it seems and there just hardened.

I hope you post pictures of the rest of the build.
Are you using a commercialy adequate carrier or did you make something.
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Old 10-28-2017, 03:33 AM   #11
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I will use all the other components from my other piston AR. I have a BRA piston system which shoots 5.45 and also one that shoots 7.62
By making my own block, I have now put together an upper which will shoot 5.56 and when I want to use the 5.56 upper all I will have to do is change out the bolt, pop one pin (out of my 5.45 upper) and all the guts of the piston system come right out the front of the gas block. Put all the components into my newly put together 5.56 upper.
The BRA carrier is solid machined where the piston rod hits the carrier.
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Old 10-28-2017, 08:56 PM   #12
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I would bake it in bone charcoal until glowing dull orange, and oil quench it. It'll give you a nice hardness and an excellent finish (reminiscent of older revolver frames) but you should clamp it to a barrel stub or something with it clamped to ensure it doesn't warp.


(I may have dabbled in color case hardening for a while...)
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Old 11-02-2017, 01:05 AM   #13
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It sounds like you're looking to harden, not just finish, and I can't help with that. But if you're happy with it as-is and just want to finish it, I was pleased with how these guys did my rusting NDS receiver after I treated it with evaporust and blasting:

http://www.midniteblack.com

I think they only charged me $20-25. Happen to be local for me, maybe you have someone by you.
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Old 11-13-2017, 09:32 PM   #14
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I ended up sending my part to H&M Black Nitride. They did an awesome job. Sizes and diameters hardly changed.
Thanks again, Tim!




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Old 11-14-2017, 09:49 AM   #15
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How much did it end up costing you?


I'm considering sending out a few brakes.
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Old 11-14-2017, 12:28 PM   #16
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I have read great things about h&h. It's not just nitride, it's qpq
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Old 11-14-2017, 03:22 PM   #17
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Quote:
Originally Posted by timhogan427 View Post
I have read great things about h&h. It's not just nitride, it's qpq
That's why it is black.

Other forms of nitriding aren't nearly as dark and don't add much color at all.
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Old 11-14-2017, 04:10 PM   #18
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There are also nitride forms that are black but do not have a high surface hardness. Bullshit "quick cycles" No I'm not talking about oxide
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Old 11-14-2017, 04:10 PM   #19
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Like tim said it was $100 minimum, which sucked for me cause I only had one part. But I think the price would be the same for multiple parts. You could call them or email them. They responded quickly to my emails.
It was worth it to me, I put some work into that part, and itís nice how all the diameters and dimensions pretty much stayed the same, unlike if I were to harden-oil quench it and then draw it back. No lapping or honeing.
Oh well itís only money, Iíll make more LOL.
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Old 11-14-2017, 05:45 PM   #20
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Quote:
Originally Posted by timhogan427 View Post
There are also nitride forms that are black but do not have a high surface hardness. Bullshit "quick cycles" No I'm not talking about oxide
QPQ takes a long time for a hard finish.

Not so long to just darken the finish.
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