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It is named after the blue-black appearance of the resulting protective finish. Even with safety glasses and a full-face shield, a rubber apron, rubber boots, etc it is possible to get salts into your eyes and all over the rest of you. References 4.3 out of 5 stars 242 ratings-30% $12.99 $ 12. It is slightly caustic, so be careful you dont leave it on the gun for long. Excellent info. Approved. ", informative and did not use technical language and concepts that would have left me floundering and none the wiser. Pour in some acetone, and while wearing rubber gloves (dishwashing gloves are OK), put in a pad of 0000 steel wool, swish it around and pull it out. Black oxide provides minimal protection against corrosion, unless also treated with a water-displacing oil to reduce wetting and galvanic action. The steel will pull some of the carbon out of the oil while quenching and harden the outer portion of the metal. You should put the brass drift (which you can make out of a piece of brass rod about 1/4 in diameter) on the sight base, and then start tapping the end of the drift with a small hammer. Its essential to keep stirring the tank to prevent the forming of hot and cold areas. If your barrel has heavier pitting, now were into filing to remove pitting, and thats something I cant teach people in mere text. If there is any finish left on the metal, it will interfere with the bluing pr "Cold" bluing is generally a selenium dioxide based compound that colours steel black, or more often a very dark grey. Not every manufacturer puts bittering agents in the solution and as one poison control nurse told me: (t)here is nothing you can do and it aint the good death.. Hunter holds a BFA in Entertainment Design from the University of Wisconsin - Stout and a Minor in English Writing. For this Instructable I'm using thread cutting oil. Itll evaporate rather rapidly, but still, dont whip it at cars or house finishes. This finish allows them to be stored in high-moisture conditions, like sports bags, without rusting. "logo": { the cost of all the tanks you need for rinse & boil-out I can keep a Krylon can always handy for touch-ups. Use your torch to bring up We will verify and confirm your receipt within 3 working days from the date you upload it. After three coats, washing and drying, the finish was not too bad, considering I was (and am) a rank amateur. This is a great time to point out that leaving guns in gun cases, especially the woolen/fleece cases, in the back of a closet, is one of the most sure-fire ways to rust the value completely out of a gun. NaOH will quickly and completely dissolve aluminum. Its easy enough to color metal with a torch, but it has always been a hit-or-miss process for me, and when it was a big hit, I was rarely able to re-create how it got that way. You risk a big fire that is self sustaining by the reaction itself. Learn more Steel is a common durable alloy, and while most steel used in tools is already tough, you can harden it even more to prevent wear and tear. This is all from memory so I might have left some stuff out. All blued parts still require oiling to prevent rust. 'Browning' is controlled red rust Fe2O3, and is also known as 'pluming' or 'plum brown'. That doesnt happen easily or by accident. The inside barrel was saved by the fact it was so full of lead fouling. NaOH is nasty stuff. http://www.lowes.com/pd_188198-316-HG-66420_0__?productId=4764059 -An old container filled with your chosen degreaser (unleaded petrol), -Your desired polished metal object/s (very important! You are a fantastic resource for all of us here. "@context": "http://schema.org/", 6 years ago. However, if the bluing effect isnt satisfactory, then you can try giving the components an acid bath (using Hydrochloric Acid). I wore latex gloves, as Brownells recommended, but used a pot holder to handle the hot barrel, and that may have been the source. Find many great new & used options and get the best deals for 13 in 1 Metal Shell Welding Torch Nozzle Tip Cleaner For Welder Soldering at the best online prices at eBay! For larger pieces of steel, you need to use a. on Introduction. The thickness of the oxide is a function of how hot you heat the steel (The color is due to interference of light reflecting from the surface of the oxide coating, and light reflecting from the oxide-steel interface). This is a great source that you can learn lots of information from and I'll advise it to to a handfuls of others. Remove any previous finish. you may benefit from the use of a gas lense as well. Once you see it turn golden, the process has started and colours will change fairly quickly! Youre just using stump remover to do it. And for the next (after the next) installment, how to do hard case coloring. The book claims they used wait for it "boiling gasoline" not making this up to clean them. I can't stress how important the degreasing step is! Please note: As you are working with heat, please be smart, use your common sense, do the bluing process in a well ventilated area and keep a wet towel to hand. Whats the difference between Brown Express and Blue Express? "url": "https://shootingmystery.com/wp-content/uploads/2021/01/How-to-Blue-Stainless-Steel-in-5-Easy-Steps.jpg" Should something happen, seek medical help right away. DG thank you. Reply The torch comes in when you first apply the Express Blue. We strongly advise that you only push through with this process if you are absolutely confident that you are able to perform the necessary precautions. WebThe gun bluing process Start with 1 gallon of water and add it to a deep fryer that has been thoroughly cleaned. If you cant, just get them out of the case and allow air to circulate around them. Im talking like 90+ minutes to heat the salt bath to 285F. The differing rate of cooling for each area produced a different color creating that rainbow effect. 3 years ago In order to confirm the bank transfer, you will need to upload a receipt or take a screenshot of your transfer within 1 day from your payment date. Im asking because theres a guy on YouTube recommending Brown Express first, then several layers of Blue over that. This article has been viewed 914,567 times. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. The parts are then oiled and allowed to stand overnight. The melting point for KNO3 is 633F. I hope to someday have good knowledge to pass on to people, heh. Posted December 21, 2009. I handed a buddy my wallet and cell phone, and stepped under the safety shower and got wet. Dont touch the metal with your bare hands since it could cause severe burns. For hazzalandy: carbon content has nothing to do with the color process, it is only the temperature you heat to, and to a lesser extent, the time spent hot. This is as deadly as the lye-based hot salts, but more for the temperature of a large batch of salts. I really appreciate you taking the time to share it DG. The higher temperatures of the other processes as well as their caustic nature could weaken the soldered joints and make the gun hazardous to use. I had to sand and restain the stock, and sanded the barrel from 120 down to 400 grit the pitting was so bad. . Metal Finishing Guru. Step 3: Suspend the components in the bluing solution tank, However, if the bluing effect isnt satisfactory, then you can try giving the components an acid bath (using, Step 4: Rinse the components in a cold water tank then transfer them to a hot one, Step 5: Submerge the components in a tank filled with water displacing oil, Address: 4455 Camp Bowie Blvd, Ste 114 #852, Fort Worth, TX 76107. Its durable and wears well. RF: Expect a write-up from me on Rust blueing and parkerizing in the next couple of weeks. Great column, and thanks for all the responses to various questions and comments. It is hazardous. Have proper ventilation and use proper modern safety gear! Where/how did you think I got to the point I could make nice guns? You want 0000 steel wool for carding between coats. One of the reasons I hand-polish up to 600 and buff only above that is that when you see one of my barrels (by holding it up to a light source, and sighting down the barrel from the muzzle at your eye to the breech out at arms length), you see no dips, waves, ripples, etc. The tempering reduces the amount of martensite and thus makes the steel softer. 2 years ago, For the record The gentleman said multiple times that the plastic container shown in the pictures was just for the instructional photos and to be sure that the container is made of metal for this process, (Homer Simpson smacking his forehead: "DOH! I have done a cold blue on a very rusted .22 for a friend. Just remove the blue/rust, degrease, dry, then blue/card/boil-out/oil/drain. Ive used this method in a pinch to make a tap from a cheap mild steel bolt to chase out galled female threads. Bluing only works on steel, cast iron, or stainless steel parts for protecting against corrosion because it changes iron into Fe3O4; it does not work on non-ferrous material. Most waters in the Rockies clear out to the west coast will have high(er) dissolved solids in them. Put 600 grit compound on a wheel, use a little too much pressure and youll be gob-smacked at how fast it can cut material off the gun. For the final step, we let the components cool down in water displacing oil. "author": "Christopher Graham", Dont leave cold blue solutions around anywhere pets or kids could get at them. The parts must be observed constantly for colour change. This process was repeated until the desired depth of color was achieved or the metal simply did not color further. ], However, oil may spill and create a fire hazard if the steel is put into the oil too quickly. Theres a reason I didnt pursue a career in chemistry. }. With HSS you're looking for 2500-3000rpm, M35 or M42 cobalt bits 3000-3600rpm, and carbide 10k-12krpm. Sorry for the misunderstanding. There can be different layers you have to apply. (You say the rod was heated, but it couldn't have been, as it was on the inside. That said, heres the truth: The best blueing you can have on a gun is simple, safe to do, but takes a long time. Safety notes: Dont use an aluminum pan. I like 1.5 wide shop cloth myself). highfour, case hardening is a bit different from what you describe.. Usually, the steel needs some time in a medium that will allow carbon to penetrate the surface, and we are talking 15 minutes to several hours. Nowadays, even mild steel does have a certain amount of carbon in the alloy, which can explain your observations, if you google "super quench," you should find a waterbased quench that is rumoured to do the same, but in my humble opinion, water can do just that as well. Ok you gotta help me out herewhen I was studying mechanical engineering a good few years back a project I done involved using a compression fit of 1/4" thick plate steel into 1" thick steel rod, both mild steel. Wait for a day to let the bluing properly cure before you do anything else to it. Copyright 2023 Flixsterz. Fortunately, this is easily had at any hardware store: WD-40 is a water displacing product, not a lubricant (contrary to widespread advertising). In comparison, rust, the red oxide of iron (Fe2O3), undergoes an extremely large volume change upon hydration; as a result, the oxide easily flakes off, causing the typical reddish rusting away of iron. For the color change to be uniform you have to remove the grease, oil, paint etc or it looks blotchy. -A heat source. You can reassemble the gun after. One can generally use the same solution to brown as to blue. It will instantly vaporize into steam and splash all over you. You can blue heat-treated parts with no ill effects. If the magnet doesnt stick, its ready to be pulled away from the heat. } This is not necessary as long as you can hold your item appropriately and not cover where it is to be heated. Heat the gun parts. I wouldn't recommend either. If you have a wood or phenolic handle, use a propane torch to heat the blade only for about two minutes. Either of these two methods is called 'hot bluing'. You turn up your nose at crap guns? To shrink, I assumed you heated the steel plate only, to expand the hole in it. The practice of bluing steel takes time and an exquisite eye for detail. Hot bluing should never be attempted on aluminium, as it reacts it usually dissolves in the caustic salt bath. Bluing, being a chemical conversion coating, is not as robust against wear and corrosion resistance as plated coatings, and is typically no thicker than 2.5 micrometres (0.0001 inches). It cannot rust any further. on Introduction, looks nice but you are using what is known as heat treatment which will darken steel, not using bluing salts as in gun bluing of rifle barrels all in all very nice instructable, Reply Tenifer get's up to (1077F) last I checked and was the 5th step in Glock heat treating after that they Pakerize it. "@type": "ImageObject", There are many methods you can use to blue the steel. When youre using hot blueing salts, youd better be on top of your game, or you can seriously injure yourself. Also buffing wheels pre blue. You can then u. se a soft brush to gently remove all the residue of the cleaning solution on the components. If you are new to the subject and are in need of detailed instructions, then youve come to the right place. Bluing is also used for providing coloring for steel parts of fine clocks and other fine metalwork. You need to adjust the boiling point of the salts for your altitude. Various processes are used for the oxidizing process. That way, you can still use your oven for the rest of the evening. Share it with us! Woodworkers doing furniture finishing will use 000 and 0000 wool, and they hate oil on their wool for rubbing down oil finishes. Fill the tank with a suitable amount of water then add in the bluing salt using the correct ratio. I wouldnt use this bluing method for these items. Ferrari installs valve seats in their aluminum cylinder heads via robot. I used Brownells Plum Brown, a product that requires that the barrel be heated to 275 degrees to activate the reaction. By using our site, you agree to our. Todos los derechos reservados. The downsides are: the safety issue, which I laid out above, and which youve made clear. While the rod may heat some by conduction, it wouldn't get hot enough to start the color-forming process. I use a pickling paste. Follow the instructions. Again, dont mess around with these chemicals and only handle them with extreme attention. The cabinet is then sealed. It also looks good on AK type weapons of which I have three to park. This article was co-authored by wikiHow staff writer. Being prepared is important if you can not measure the temp. Both refer to the same chemical process for providing true gun bluing.[1]. Check out the video:https://hackaday.io/project/21947-makers-vise/log/60914-coloring-steel-with-magnetism. Soft, low-carbon steel was used, but strong materials were needed for the receivers of firearms. Rust bluing was developed between hot and cold bluing processes, and was originally used by gunsmiths in the 19th century to blue firearms prior to the development of hot bluing processes. I like using acetone to strip the heavy oil on guns, because it lightens up the oils and makes them easier to strip with a water-based cleaner. Dang it all. This article was very, "I've been working with steel since I was a child, and reviewing these proper methods and skills makes my projects, "It surely educated me on several points. JUST DONT. Both ingredients are super cheap. Dont scrub the solution onto the gun, just run a patch that is not dripping wet down one complete run on the barrel/action in one smooth stroke. While still hot and while wearing rubber gloves rub the bluing compound Into the steel with the steel wool. Most cold blueing agents contain some selenium dioxide in them to enable to them to react at room temps. 2mm wire has a circumference of ~0.25in. If I remember right they then heated them up a bit and applied fish oil orignal and I think latter switching to linseed oil to protect the finish and give it that wet look. How to colour steel with heat (hot oil finish) is a simple but effective way of achieving a desired colour of choice.The colours are fantastic and often come out in a beautiful two-tone shine. occasionally I'll buff it afterwards. You wouldnt need salts. To remove pitting and keep the barrel profile intact requires skill with a file, and that requires hands-on training. For the process your metal should be nicely polished for the best results.The more shinier the polish the more your end result will glow. Heating will make the metal better in absorbing the bluing liquid. Once the steel is clean, you can begin heating it up. A few safety items: 3.3k. So basically, youll want the rifle in the vise with the muzzle pointed to your left. Oh mas oui.Express blueing, slow rust blueing, hot salt blueing, nitre blueing, carbona blueing all are better than cold blueing. High temperatures and dangerous chemicals mean that a moment of carelessness can make you pay a heavy price. The plate turned blue just like you ible and I was told this was an effect of compression fitting.the rod didn't change colour even though it had the heat applied to it so was it actually the compression fit that changed the plates colour. It is vastly appreciated even by those of us who will probably never use it. *700F is very close to the heat treatment temperature of some steels. But since this was my first project, with an inexpensive kit as a learning tool, and as I intend to do this again with a much more expensive kit, my trials and errors and your voice of experience will be very useful the next time around. Trust me, I'm speaking from experience :) ). 4. Once you get the colour you want, go outside to your oil container and fully quench your object into the oil!Note: I know a plastic container is Were committed to providing the world with free how-to resources, and even $1 helps us in our mission. Not only does it give you an alchemical feeling of satisfactionbut it also gives the metal a finish to stop corrosion. Treating with an oiled coating enhances the protection offered by the bluing. I'm trying to be positive and constructive, and think this is: for an amateur to stick a very hot torch-heated metal object into a plastic container filled with oil is simply dumb (ok, more polite: "irresponsible") at best, highly dangerous at worst. It is generally employed on smaller parts such as pins, screws, sights, etc. Slow rust blueing can take a week or more to accomplish, but it is a durable blue job like no other. YouTube - Nitre bluing a few gun parts. No one can even tell you what the heat treat is on a 1895 Mauser for instance yet we do not wet ourselves before we shoot one! Oil binds with the metal and prevent it from getting air/chemicals to corrode. Ive gotten hot blue salts on me splashed into my hair. You dont want to affect the hardness of your steel in critical areas like actions, bolts, bolt lugs, barrels, chambers, etc. Repeat 3 times. I believe the change of color is due to a growing thickness of an oxide layer. It does provide good rust resistance, which is improved with oil. it would appear these sights are drifted into dovetails. Then you can express blue it with a propane torch and a tank of boiling water. This process is also the only process safely used to re-blue vintage shotguns. You heat the outside member only when you do a shrink fit.). 1. Higher carbon contents will take longer to heat. on Step 1. Heating it again to a lower temperature will not introduce additional martensite. Usually, you can find the manufacturers recommended ratio in the product manual. for 6-8 hours. I can then get the temp to be 600F spot-on in a lead melting pot. Get it Feb 25 - 27. WHERE or when would the torch get used? It takes practice. Do all the prep you would for express or rust blueing, especially degreasing. Thank you, DG! Cooking off the more volatile hydrocarbons leaving the heavier ones produces a different effect yet again. Itll take perhaps 20 minutes to really dry down. Cold blueing is OK for touchups, at best. Drill bits and gun barrels are common examples. There are 10 references cited in this article, which can be found at the bottom of the page. I have at least three cold blue solutions in my shop including Oxpho-blue, 44-40 and others. I've never done anything like this but want to try. BUT like so many power tools on guns, it is possible to create expensive screw-ups to fix on guns with power tools, and buffing wheels are no exception. "publisher": { Reply Then the crucibles would be removed from the furnace and placed over boiling hot water and air would be bubbled through the water and the parts would be dropped into the water. In the hot salt process, you will need, oh, four to six tanks, only one of which will be the heated blueing salts. Then you have to heat the metal. If you drop a piece of paper in there, or hydrocarbon compounds (like oil or grease on your part). With. When everything is set up, put on your protective gear and then get down to business. Heating white, degreased steel to 550 to 600F results in brilliant colors. You work on nice guns! This item: Special Blue Full Metal Butane Torch (Gold) - Refillable Flame Lighter- Culinary Torch - Welding Torch - Adjustable Dual Flame for Desserts, Creme Brulee, BBQ and Baking. Heat the area you'd like to drill just until it starts to glow red, then allow it to cool slowly. Cold blues will react with steel at room temperature, but you get more aggressive reactions when you heat the gun to, oh, 150 to 200F. The robot gives the steel valve seat a quick blast with liquid nitrogen and drops the seat right in place. The steel is also used for producing great police flashlights with awesome durability. "description": "If you want to find out how to blue stainless steel, then you've come to the right place. Just dont do it. Spray down the whole barreled action with copious amounts of WD-40, inside and out. Its oiled in production to keep it from rusting on store shelves. Use a smaller toaster oven if your piece of steel fits inside. You have a degreased gun, and now you need to get the metal hot enough that the reaction will oxidize the steel as much as possible. Its a good process, but it isnt a 1:1 replacement for blueing. Keep posting like this. I rarely use them. Youre a gunsmith who has a lot of nice guns! Stainless steel can only tolerate hot bluing and a limited amount of chemicals. Hi SteelJunkee Method is as follows: Fit rod into drill and set at constant speed Clean rods with acetone on clean rag Use butane and propane mix blow torch to achieve colour range Quench in water Dry The weird thing is that they look great for around 4-5 days then deteriorate. Free shipping. So I buffed down the barrel with steel wool and started over heating the barrel in the oven before taking it outside to add the solution (which is nitric acid). - Ballachy", "Bluing of Steel by Heat Treatment: Why and How it Happens? At the end of this heating process the crucible is removed from the oven and positioned over a bath of water with air forced through a perforated coil in the bottom of the bath. Im not responsible for marital discord as a result of gun projects attempted on the kitchen stove. Now securely hold your piece with whatever you have chosen. Thanks for the lesson, DG. Spilling salts at this temperature will instantly result in fire, because the KNO3 is a powerful oxidizer all on its own, and the added thermal energy will light anything on fire all alone. The object on the left is a custom mild steel potentiometer knob! The hotter the steel, the further the oxygen can diffuse through the oxide coating, so the coating builds thicker before it protects the steel from further oxidation. Often it does provide an adequate cosmetic touch-up of a gun's finish when applied and additionally oiled on a regular basis. As a small thank you, wed like to offer you a $30 gift card (valid at GoNift.com). (meaning oxygen atoms are able to attach themselves to the outer layer of the steel)We did this with an electromagnet! Ill be saving this for the future. Now, using the information above, you should have little problem bluing your firearms on your own. If the solution is still boiling vigorously, then you can expect the bluing to happen naturally.