I understand heat checking is the typical way nearly ALL stainless barrels eventually give it up. At some point a scale flakes off,and the barrel is done.
I understand it has to do with approx. 4500 deg f gas flash heating a microscopic depth of surface steel.As stainless is not as good of a conductor,a marked temperature differential between the very surface and the substrate at an ambient temperature will inevitably result in shear stresses at the surface.
I get that.
But down at the grain structure level,,the threads of sulphur being attacked by chemicals also has a micro-fissure effect on the steels surface.
There was something in the article about a PhD Chemist explaining how extremely corrosive chlorate salts being formed in these micro-fissures due to ammonia and chlorinated hydrocarbons mixing together.
I do not pretend to be a metallurgist or a chemist.
I have read a lot of articles by Mr Borden in Precision Shooting,The Accurate Rifle,and other serious shooting publications.
He does know a thing or two about rifles.
And Mr Sceumann knows a thing or two about handgun barrels.That Kunhausen guy seems to think highly of him.
Here are a few things I find interesting about the responses.There was a focus on the apparent shortcomings of a barrel maker's literary composition skills versus what he was trying to tell us. Mr Scheuman simply gathered a collection of comments from some of the knowledgable people in the field of rifle or pistol barrel accuracy.
IMO,how his work would be graded as a school paper is irrelevant.
The commentors who suggested my aquaintances rate of fire is the issue have never met my friend,never watched him shoot,and they have no idea of his rate of fire. You explain away new information by invalidating it with your own head fantasies.
Mr Frankenmauser: I did not indicate that my friend blamed anyone or anything.He made excuses for nothing.You don't know him. Could it be you are trying to fil in the blanks by projecting your own process?
All my friend did was ,with an open mind,humbly ask "What is going on?"
When I learned he was using Brake Clean,I passed on to him what I had read years ago.
Kind of stupid of me,but I thought I'd share here,thinking I might help someone not scrap a barrel. And I did clearly state"You do whatever you want"
Its rather like when I recently lost a lovely young 35 year old woman friend to a really stupid house fire,I put it out there that "Yes,oily rags really can start a fire"
Of course,I got unpleasant feedback for that,too.
Typically the competition this gentleman engages in amounts to very small targets at various ranges out to 1000 yds plus.Typically he is only allowed a max of two rounds per target.Then there is a move toa different stage. He does not shoot strings.These are sniper competition type folks,many of them SWAT team people.
He's also a very technically minded engineer,who is quite aware of the $6000 or $7000 he paid for the rifle.
To say it another way,you don't know what you are talking about.You make up things in your head to explain what you don't understand.
I know when I was making aircraft,submarine,etc parts,the chlorinated hydrocarbon tapping fluids (like Rapid Tap,old formula) were forbidden because they affected some steels.
Back to heat. I'd agree,don't get your barrel too hot to comfortably hold.. How hot is that? 150 deg,160? Might a barrel get pretty hot in the sun?
So,a 90 deg barrel ,in the summer,would heat up what? 60 deg before the "experts" say heat is going to damage the barrel?
I call BS. IMO,you could boil that barrel before you started a string and it makes no difference.
A uniformly warmed up barrel is not the problem.The problem is a layer of steel,maybe a half a thousandth deep,is heated by 4500 deg gas.I do not care a bit if the steel .005 deep is 100 deg or 200 deg. The problem is that the surface .0005 of steel is a LOT hotter than the steel at a depth of .002.Due to expansion,there is a thin zone of stress a couple of thousandths thick. Its there for a 100 deg barrel,and its there for a 200 deg barrel.
But I'm tired. I'm laughing,I remember a school I used to work at got evacuated and some folks went to the mergency room because...Guess what happened? Some MORON mixed CHLORINE BLEACH with AMMONIA in a bucket. Quite reactive.Makes gas that can kill you. Sure,go ahead,mix them in your rifle bore!
I really do not care a rats hiney hair about what you do with your barrel.
As a matter of fact,to the skeptics,please do,get that good red can brake fluid,some Sweets,and some...What was the other? M-pro 7? Throw in some Tetragun,Barnes Copper remover,Butches Bore Shine! Make a cocktail! If a little is good,a lot is better!And soak it over night.In YOUR barrel,not mine
Have fun with that.
Sometimes...I don't know why I waste my time on people.
'Bye
I understand it has to do with approx. 4500 deg f gas flash heating a microscopic depth of surface steel.As stainless is not as good of a conductor,a marked temperature differential between the very surface and the substrate at an ambient temperature will inevitably result in shear stresses at the surface.
I get that.
But down at the grain structure level,,the threads of sulphur being attacked by chemicals also has a micro-fissure effect on the steels surface.
There was something in the article about a PhD Chemist explaining how extremely corrosive chlorate salts being formed in these micro-fissures due to ammonia and chlorinated hydrocarbons mixing together.
I do not pretend to be a metallurgist or a chemist.
I have read a lot of articles by Mr Borden in Precision Shooting,The Accurate Rifle,and other serious shooting publications.
He does know a thing or two about rifles.
And Mr Sceumann knows a thing or two about handgun barrels.That Kunhausen guy seems to think highly of him.
Here are a few things I find interesting about the responses.There was a focus on the apparent shortcomings of a barrel maker's literary composition skills versus what he was trying to tell us. Mr Scheuman simply gathered a collection of comments from some of the knowledgable people in the field of rifle or pistol barrel accuracy.
IMO,how his work would be graded as a school paper is irrelevant.
The commentors who suggested my aquaintances rate of fire is the issue have never met my friend,never watched him shoot,and they have no idea of his rate of fire. You explain away new information by invalidating it with your own head fantasies.
Mr Frankenmauser: I did not indicate that my friend blamed anyone or anything.He made excuses for nothing.You don't know him. Could it be you are trying to fil in the blanks by projecting your own process?
All my friend did was ,with an open mind,humbly ask "What is going on?"
When I learned he was using Brake Clean,I passed on to him what I had read years ago.
Kind of stupid of me,but I thought I'd share here,thinking I might help someone not scrap a barrel. And I did clearly state"You do whatever you want"
Its rather like when I recently lost a lovely young 35 year old woman friend to a really stupid house fire,I put it out there that "Yes,oily rags really can start a fire"
Of course,I got unpleasant feedback for that,too.
Typically the competition this gentleman engages in amounts to very small targets at various ranges out to 1000 yds plus.Typically he is only allowed a max of two rounds per target.Then there is a move toa different stage. He does not shoot strings.These are sniper competition type folks,many of them SWAT team people.
He's also a very technically minded engineer,who is quite aware of the $6000 or $7000 he paid for the rifle.
To say it another way,you don't know what you are talking about.You make up things in your head to explain what you don't understand.
I know when I was making aircraft,submarine,etc parts,the chlorinated hydrocarbon tapping fluids (like Rapid Tap,old formula) were forbidden because they affected some steels.
Back to heat. I'd agree,don't get your barrel too hot to comfortably hold.. How hot is that? 150 deg,160? Might a barrel get pretty hot in the sun?
So,a 90 deg barrel ,in the summer,would heat up what? 60 deg before the "experts" say heat is going to damage the barrel?
I call BS. IMO,you could boil that barrel before you started a string and it makes no difference.
A uniformly warmed up barrel is not the problem.The problem is a layer of steel,maybe a half a thousandth deep,is heated by 4500 deg gas.I do not care a bit if the steel .005 deep is 100 deg or 200 deg. The problem is that the surface .0005 of steel is a LOT hotter than the steel at a depth of .002.Due to expansion,there is a thin zone of stress a couple of thousandths thick. Its there for a 100 deg barrel,and its there for a 200 deg barrel.
But I'm tired. I'm laughing,I remember a school I used to work at got evacuated and some folks went to the mergency room because...Guess what happened? Some MORON mixed CHLORINE BLEACH with AMMONIA in a bucket. Quite reactive.Makes gas that can kill you. Sure,go ahead,mix them in your rifle bore!
I really do not care a rats hiney hair about what you do with your barrel.
As a matter of fact,to the skeptics,please do,get that good red can brake fluid,some Sweets,and some...What was the other? M-pro 7? Throw in some Tetragun,Barnes Copper remover,Butches Bore Shine! Make a cocktail! If a little is good,a lot is better!And soak it over night.In YOUR barrel,not mine
Have fun with that.
Sometimes...I don't know why I waste my time on people.
'Bye
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