My 12 gauge single barrel got rusted, due to the rust all smoothness and finishing gone for ever.Gunsmith here applies different methods to restore the original Bluing but still its not good. I learned a lot from this video, please help me further for the nice results.Thanks Steve for the superb upload.
@EngineerSteve
10 ай бұрын
Thanks for you comment! if you want to try something else, you might want to try cold bluing as well, visually it gives similar (or even better) results without potential heat distortion.
@khanibrahimo
17 күн бұрын
GOOD❤❤❤
@EngineerSteve
15 күн бұрын
Thanks for your comment, have a nice day!
@deonlouw1198
Жыл бұрын
It IS bluing and defnitely more durable than any of the cold bluing solutions. Nice video Steve.
@EngineerSteve
Жыл бұрын
Thanks for your comment! I am planning to compare the durability of cold and hot bluing to see what the difference is.
@LBCAndrew
Жыл бұрын
This is NOT bluing. Heating steel till it turns blue ruins the heat treatment and hardness of the steel. Proper steel bluing is done using a solution of potassium nitrate, sodium hydroxide, and boiling water.
@EngineerSteve
Жыл бұрын
@@LBCAndrew Depending on the desired specification, the state of temper/hardness does not always matter. Nevertheless it is important to have some knowledge of how the steel might be affected.
@neffk
2 жыл бұрын
I think this is blacking, an old blacksmith trick. It does help protect the metal but it's quite superficial and not very durable. Bluing forms layers of magnitute (IIRC) which you impregnate with oil. Totally different from what you demonstrated.
@melgross
2 жыл бұрын
Understand that no bluing method, including the very hazardous industrial methods, is terribly durable. They are relative to each other as to durability. The only reason they’re used is that painting those parts isn’t practical for various reasons, cosmetics being one.
@ShadowLancer128
Жыл бұрын
@@melgross wait so painting is MORE durable, NOT less, than hot bluing? God, I need to go back and take a physics class.
@melgross
Жыл бұрын
@@ShadowLancer128 hot bluing isn’t that durable, it does rust if moist. And please don’t try to play a physics card. It has nothing to do with that, it’s chemistry. I had four years of physics and six years of chemistry, so don’t go there.
@mesothelioma5024
14 күн бұрын
Can you do multiple dips for a darker finish?
@EngineerSteve
12 күн бұрын
The finish is mainly determined by the temperature at which you dip the part, if you want more control over the finish, cold bluing is also a good option.
@robertwest3093
Жыл бұрын
Basically when you get the part to around 570 degrees is when the darkest blue shows. Any hotter and it turns straw colored.
@EngineerSteve
Жыл бұрын
Indeed, I would prevent higher temperature as to not mess with the temper, especially if the part has been heat treated.
@frankieromnimon5898
9 ай бұрын
Actually no: The straw color appears first, turning to gold, then purple, then blue and finally black. The blueing in the video has pushed the color past the blue region into the black. He should have heated the part more slowly, not using a torch but rather a bed of hot beads of metal shavings (check Clickspring's excellent video on just this procedure). This would give a more even color and would allow for removing the part when truly blue, as the metal goes through the various colors in well under a minute ( a few seconds with a torch as strong as that of the video).
@aerof1
2 ай бұрын
Also too hot when dropping it in the oil and the oil will boil and cake on the metal instead of soaking in
@LBCAndrew
Жыл бұрын
Don't go using this on gun parts. Getting the steel that hot will ruin the hardening and tempering of the steel.
@kogyi718
8 ай бұрын
Thank you very much.
@EngineerSteve
8 ай бұрын
Thanks for your comment!
@everythingyouneed8957
Жыл бұрын
Does this protect the metal from rust aswell or is it just decorative?
@EngineerSteve
Жыл бұрын
A thin layer of oil will be contained within the surface after heating and oxidizing the part which provides some protection. I am planning on doing a video on testing cold blue vs this proces regarding rust protection.
@michelleijao7489
2 жыл бұрын
Hi I just want to ask if is it okay to hot blue a butcher knife to avoid rust? Will it affect the steel or the food it slices?
@EngineerSteve
2 жыл бұрын
For hot bluing the ideal temperature is 250-300C (480-570 F) I am afraid that it will mess with the temper but I am not an expert on that to be honest.
@nicktrueman224
Жыл бұрын
I would leave it alone. If it's a high carbon steel blade which ot sounds like, and not stainless well you could ruin the heat treatment of the blade. There is a way to blue off blades but it's usually done during manufacturing. Certain foods will interact with the steel. I imagine it's a larger knife too, so allot of heat would needed and needs to be uniform. So if the handle is timber it will burn. Show it to a knife smith and see what they think could be a option for you? Good luck.
@LBCAndrew
Жыл бұрын
Doing this would ruin the hardening and tempering of the knife. Any temperature over 450'f will make the steel soft and no longer hold a decent edge. The only way to fix that is to heat the knife till it's no longer magnetic, around 1450'f then quench in either water or oil (depending on the type of steel) to make the steel hard again. Then Bake in an oven at 400-450;f for 1-2 hours to make the hard brittle knife into a "tough" steel.
@EngineerSteve
Жыл бұрын
@@LBCAndrew Well said, your knowledge on this topic surpases mine.
@michaelmartin5545
2 жыл бұрын
Thanks
@ismatnoori5978
Жыл бұрын
Which oil is best for bluing?
@EngineerSteve
Жыл бұрын
I am not sure which type of oil is best for bluing, a lot of people recommend light oils like vegetable oil or hydraulic oil, some even suggest water. Personally I have gotten really good results with vegetable oil.
@prostreetgsxr
Жыл бұрын
So what is the ideal temperature?
@EngineerSteve
Жыл бұрын
It kind of depends on the result you are looking for. When you heat up steel it will start to change color, dipping it in oil at the right time will preserve that color. I like to heat it up to around 280 C (540 F) www.quora.com/What-is-the-temperature-of-steel-when-it-is-heated-to-a-blue-color
@gtamyths96
6 ай бұрын
My airgun lost its bluing in one spot, could i heat that part and put a few drops of oil on just it? Also could I put gun oil instead of vegetable oil? Thanks!
@EngineerSteve
6 ай бұрын
In that situation I would recommend using cold blue. I think it will work better for small spots, additionally you don't have to heat up the part at all.
@pauldevey8628
2 жыл бұрын
Great channel. I learn a lot.
@EngineerSteve
2 жыл бұрын
Thanks !
@floridamanpresents3952
2 жыл бұрын
im digging the content. gentle voice over works well too. piano music should be upbeat
@EngineerSteve
2 жыл бұрын
Thanks for your comment! appreciate it
@jlh357
Жыл бұрын
Isn't this just oil polymerization like seasoning on a cast iron pan?
@EngineerSteve
Жыл бұрын
I think polymerization really creates a layer by heating up oil/grease, while bluing steel is more of an oxidation proces. But then again I'm not a specialist in that specific field so I could be wrong.
@jlh357
Жыл бұрын
@@EngineerSteve i think your right but im not sure if when you dip the part in the oil it's polymerizing the oil onto the steel or causing some sort of reaction for it to oxide a certain way
@EngineerSteve
Жыл бұрын
@@jlh357 My (limited) understanding is that the steel oxidizes when you heat it up, thus discoloring the steel to a blue color (the color depends on temp.) The oil then cools down the steel, leaving the oxidized color. The chemical details of the rust protection by oil is not known to me, but I will look into it.
@abee3515
Жыл бұрын
Would this affect the hardness of the steel?
@EngineerSteve
Жыл бұрын
The temperature at which steel starts to blue is a lot lower than the hardening temperature, when the molucule structure is affected by heating and quenching. There should be no difference in hardness.
@LBCAndrew
Жыл бұрын
@@EngineerSteve Nonsense. Any temperature over 400'f begins to ruin the hardness of steel. When i temper the knives i make, i heat till 450'f which makes the steel turn a straw color, and that is what makes super hard brittle steel into a tough usable steel. The actual hardening process prior to tempering requires temps of over 1450'f though.
@arnenelson4495
5 ай бұрын
Is it safe to heat a revolver cylinder this much?
@EngineerSteve
5 ай бұрын
I am no expert at bluing guns but I would apply cold blue in this situation to prevent heat distortion.
@MausTanker
2 ай бұрын
heat and vegetable oil? THATS IT?!?!
@EngineerSteve
2 ай бұрын
Heat (the right amount) and any type of oil, yes that's it😉
@MausTanker
2 ай бұрын
@@EngineerSteve That's interesting. I'd be worried about doing so with firearms parts as that may ruin the temper and present a safety issue.. but this is cool nonetheless.
@EngineerSteve
2 ай бұрын
@@MausTanker I would not advise doing it on vital gun parts for the concern that you mentioned. Cold bluing seems more suitable for that purpose, I would imagine.
@MausTanker
2 ай бұрын
@@EngineerSteve still very cool to know!
@atam4023
2 жыл бұрын
would that works with firearms?
@EngineerSteve
2 жыл бұрын
I guess it would work but usually the process used on firearms is cold bluing if I am not mistaken: kzitem.info/news/bejne/14mVzKOlbp2lqKQ
@1rex01
2 жыл бұрын
@@EngineerSteve cold bluing is used more as restoration, where as production or professionally done firearms are hot bluing process
@EngineerSteve
2 жыл бұрын
@@1rex01 Thanks for the information! I'm not really an expert on that.
@FunWithGuns
2 жыл бұрын
This is not hot bluing and it wont help much with rust prevention. You can fire blue parts this way but this isnt hot/salt bluing.
@Claud031
Жыл бұрын
Does it have to be vegetable oil
@EngineerSteve
Жыл бұрын
Not necessarily, I chose for vegetable oil because it is cheap and accessible. It will work with other oil as well, I am unsure whether the results will be different or not.
@Chandler7157
Жыл бұрын
@@EngineerSteve Can you blue a part over and over again to add layers of blueing? sorta like hot salt bluing?
@Ha63ppy
10 ай бұрын
Can you do this with stainless steel
@EngineerSteve
10 ай бұрын
I have yet to try this process on stainless steel, of course the purpose of bluing is rust prevention, which is not that much of an concern on stainless. If you are aiming for discoloration you can surely change the color of stainless by just heating it.
@justin_704
2 жыл бұрын
this is heat treating/case hardening
@EngineerSteve
2 жыл бұрын
No, for heat treating the part needs to be much warmer, the molecule structure will not be affected that much when hot bluing.
@FunWithGuns
2 жыл бұрын
You're right, this isnt hot bluing.
@LBCAndrew
Жыл бұрын
This isn't hot enough to case harden. It's also hot enough to ruin your steels hardness.
@sierraecho884
Жыл бұрын
Hot bluing basically destroys your part, since it´s a head treatment technique. It´s also the worst method to prevent corrosion in steel. It´s only a very very thin layer which needs constant oiling. Do zinc plating or painting instead if you want to preserve your parts structure not cause warpage and get better corrosion protection.
@EngineerSteve
Жыл бұрын
The temperature to which the part is heated, barely changes the structural strength of the part. The annealing temperature for steel is around 815 C (1500 F), where as hot bluing happens closer to 290 C (550 F). I hope this clears thing up, rust protecting properties are not that good indeed but hot bluing has its use cases. Have a nice day.
@sierraecho884
Жыл бұрын
@@EngineerSteve Hardening temp is a range depending on material of about 800°C-900°C However, temperatures as low as 250°C have an influence on the parts structure. That´s why parts have to be annealed in an oven after heat treatment which makes them hard and brittle, to simply gain their ductility back. As you can see hot bluing is in a range where the material structure is influenced, not as much as hardening does but still sufficient enough to change the part properties for certain applications. Martensitic structures within the steel already change at 150°C.
@EngineerSteve
Жыл бұрын
@@sierraecho884 True, I guess it depends on the application of the part, whether or not you want to risk disturbing the structure with heat.
@sierraecho884
Жыл бұрын
@@EngineerSteve Exactl! Hot bluing parts should be a good idea right after you forge them, since you have to heat treat them anyway, so you can just dip em into some oil and later on anneal the part. Honestly this is the biggest disadvantage of steel which I hate, it´s super prone to corrosion unless you use Chrome in the alloy.
@LBCAndrew
Жыл бұрын
Hot bluing isn't done like this. It's done using boiling water and some real nasty chemicals.
@KS-bf7si
5 ай бұрын
That's not black ! Or even blue come to that .
@EngineerSteve
5 ай бұрын
This process is commonly referred to as'hot bluing' my best guess is that the metal oxidizes to a blue colour (by means of heating it) before being cooled down in oil, hence the name
@killthecardinals
2 жыл бұрын
This is not bluing.
@EngineerSteve
2 жыл бұрын
There seem to be a lot of contradicting opinions on wheter this is hot bluing or not. All I know is that this process is also known to people as hot bluing but I'm not expert.
@traZODone2
2 жыл бұрын
The first half of the video is called tempering not hot bluing
@EngineerSteve
2 жыл бұрын
I don't really agree with that, you need to heat up the part to a certain temperature, to which the color is a good indication. My torch is not that powerfull so it took a while, that's why it looks like tempering.
@copymutt8762
2 жыл бұрын
Gave up, sorry i can not understand you.
@OlRubberNuts
2 жыл бұрын
Lol you're goofy
@xJackHunter
Жыл бұрын
just say you're stupid lol
@hoffy97
Жыл бұрын
This is not hot bluing; hot blueing uses an alkali solution at elevated temperatures to get the reaction. What you are doing here is a type of bluing, but it's closer to seasoning a cast iron skillet than actual "hot bluing". From Wikipedia: The "hot" process is an alkali salt solution using potassium nitrite or sodium nitrate and sodium hydroxide, referred to as "traditional caustic black", that is typically done at an elevated temperature, 135 to 155 °C (275 to 311 °F). This method was adopted by larger firearm companies for large scale, more economical bluing. It does provide good rust resistance, which is improved with oil. en.wikipedia.org/wiki/Bluing_(steel)
Пікірлер: 85