Page Index Toggle Pages: 1 Send TopicPrint
Question on Hardness of Krag Receivers and Parts (Read 595 times)
Robidouxs
KCA Forum Member
*
Offline


Krag Enthusiast!

Posts: 6
Location: Tucson, Arizona
Joined: Oct 5th, 2015
Gender: Male
Question on Hardness of Krag Receivers and Parts
Jan 22nd, 2019 at 7:26pm
Print Post  
I have been in contact with a heat treating company who has been recommended as the place to have Mauser receivers heat treated.  This company has agreed to heat treat my Krag receivers via case hardening but have requested the Rockwell Scale hardening they need to achieve.

If you know it, please post what the level Rockwell hardness should be achieved for the following:

1) Krag Recievers
2) Krag parts
  
Back to top
 
IP Logged
 
butlersrangers
KCA Forum Member
*
Offline


Krag Enthusiast!

Posts: 4741
Location: Michigan Bi-Peninsular&Proud
Joined: Oct 7th, 2009
Re: Question on Hardness of Krag Receivers and Parts
Reply #1 - Jan 22nd, 2019 at 7:57pm
Print Post  
I don't know the answer, but, why?

Your receiver is already casehardened & proofed and your other parts have been tempered.

IMHO messing with re-hardening risks damaging the receiver and other parts.

Maybe a better idea is to buy a (New-Old Stock) Bolt for $55, from 'Grandpa's Gun Parts'.
  
Back to top
 
IP Logged
 
FredC
KCA Forum Member
*
Offline


Krag Enthusiast!

Posts: 400
Location: Dewees, Texas
Joined: May 31st, 2013
Gender: Male
Re: Question on Hardness of Krag Receivers and Parts
Reply #2 - Jan 22nd, 2019 at 8:03pm
Print Post  
Butlersrangers has reported that the case hardening was done by the pack method with organic carbon bearing material and special areas such as the receiver and bolt lugs receiving a cyanide maybe in a paste form applied for deeper carbon penetration. I have never seen any hardness data published for Krags. These were made in the early days, not sure if the Rockwell hardness system was even developed then. Krags probably varied quite a bit from year of manufacture, which shift, maybe which season and which operator was involved.
If  you tested a number of part and paid the most attention to strength and wear areas you might get some clues on what is right. I am not sure if anyone has done this till now.
Thin areas of the receiver would have gotten carbon penetration from both sides and maybe quite hard and perhaps brittle. Maybe a little extra tempering in those spots would prevent cracking.
If you are looking to get nice cased hardening colors, I think I would ask for just enough carbon in the pack to match what would be lost in the treatment then temper a little more on areas like the bottom of the magazine box that might get brittle. Hope your can work it out with the heat treater the necessary details as most if not all the original trial and error secrets have been lost.
If anyone can give specific hardness numbers for Krag parts and different areas of the bolt and receivers I am all ears.
A few of the parts like the extractor body maybe a higher carbon spring steel and completely different from most of the low carbon cased parts.

Chuck beat me in typing a reply but his question WHY is a good one. I  personally do not see the risks involved as worth the effort to get nice case colors. Trying to get more hardness or strength would probably bring negative unintended consequences.
  
Back to top
 
IP Logged
 
Whig
KCA Official Member
***
Offline


Krag Enthusiast!

Posts: 232
Location: Balt MD
Joined: Sep 24th, 2016
Gender: Male
Re: Question on Hardness of Krag Receivers and Parts
Reply #3 - Jan 22nd, 2019 at 10:55pm
Print Post  
I agree with the above. I have shot many of my Krags with hundreds of rounds that were factory loaded and hand loaded. I have never had, nor seen, a failure in any way. If you don't overload your reloads, you should be well within pressure limits, even with 100+ year old Krags.

You are seeking a solution to a problem that just doesn't exist in any significant amount.

Shoot your Krags and enjoy them like the rest of us. There's lots of fun to be had!
  
Back to top
 
IP Logged
 
Local Boy
KCA Forum Member
KCA Official Member
*
Offline


Krag Enthusiast!

Posts: 272
Location: Mat-Su Valley, Alaska
Joined: Sep 24th, 2015
Gender: Male
Re: Question on Hardness of Krag Receivers and Parts
Reply #4 - Jan 23rd, 2019 at 12:38am
Print Post  
Hi Robidouxs,

If your trying to just get that color case hardened look... then maybe you might want to try obtaining that patina through chemical means:

(You need to Login or Register to view media files and links)

(You need to Login or Register to view media files and links)

Can't say how durable it might be... maybe some internet searching would reveal if it's a viable option.

Here's a video about 'Turnbull Restorations'... a portion of the video deals with applying varnish to the heat treated receiver:

(You need to Login or Register to view media files and links)
« Last Edit: Jan 23rd, 2019 at 2:48pm by Local Boy »  
Back to top
 
IP Logged
 
Page Index Toggle Pages: 1
Send TopicPrint
 
  « Board Index ‹ Board  ^Top