To remove pitting and keep the barrel profile intact requires skill with a file, and that requires hands-on training. Never know when it will come in handy. Alternatively, you can press the pad of steel wool between your hands over the container of acetone, and then put it on some paper towels to dry. The differing rate of cooling for each area produced a different color creating that rainbow effect. Heat the Steel. Process that partially protects steel against rust, This article is about the historical uses of black oxide. Very helpful! -2x containers (one of them preferably being metal for the oil), -unleaded petrol/Acetone/Terpentine/Rubbing alcohol or any good degreaser, -metal object/s (I used mild steel, Please note this method should NOT be used on tempered/hardened steel as you will effect the properties of the metal). Prepare the components of the metal surface before you attempt to blue using your tools. I am using bronze, is it for a polish? 84 or Du-Lite 3-0. To harden steel, start by heating the metal directly with a blow torch until it turns a cherry red color. I used Brownells Plum Brown, a product that requires that the barrel be heated to 275 degrees to activate the reaction. The de-greasing you do directly affects the uniformity of the browning or blueing. Both refer to the same chemical process for providing true gun bluing.[1]. You might also want to read our article on how to easily darken stainless steel or blacken stainless steel for more ways to personalize your gear. The usual mistake on buffing wheels is using too coarse a compound, and then the wheel becomes quite aggressive in removing material. My first time wasnt a stunning success. My dad keeps his in a big safe with large desiccant packs that he threw in there. It is caused by a layer of oxide that forms when the steel is heated. An iron wire, stainless dipper, and part basket are required to handle the guns components and adjust the bluing solution as well. 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. It is generally employed on smaller parts such as pins, screws, sights, etc. Salts. Then, you can put the components back into the bluing tank and increase the temperature until you see the blued steel. Oil-free steel wool is also sold by woodworking shops. Just take them from the comments he posts. Youll have a hot caustic degreaser tank (about 10 minutes), then a cold rinse tank, then into the hot salts for, oh, 15 to 20 minutes, then out into the hot rinse, then into a cold running rinse tank, then into a water displacing oil tank for 20 minutes or so. Its nice when something can be re-used a time or two, especially when used in diversified ways. I like 1.5 wide shop cloth myself). Also thanks DG! It will first turn gold, then orange, then red, purple, blue and then dark grey! Large scale industrial hot bluing is often performed using a bluing furnace. It is named after the blue-black appearance of the resulting protective finish. 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.. Vegetable oil has a higher boiling point, so the hot steel will take longer to cool and reduce the chance of it cracking. A Pocket Sundial From a Broken Pocket Watch! Heating will make the metal better in absorbing the bluing liquid. Modern home hobbyist versions of this process typically use a hydrogen peroxide and salt solution, sometimes with vinegar, for the rusting step to avoid the need for more dangerous acids.[7]. Oil binds with the metal and prevent it from getting air/chemicals to corrode. I hope to someday have good knowledge to pass on to people, heh. "https://www.facebook.com/Shooting-Mystery-110244180901951", Use ice cubes. Do NOT wipe/touch your metal with anything after degreasing as the whole purpose of cleaning was then for nothing. Being prepared is important if you can not measure the temp. Reply Your container should be relatively larger than your object. Mea maxima culpa - and I left my comment up rather than delete the thread (for now) just so I could reply and admit the My Dumb, rather than skulk away cleanly >;-), Question Hot NaOH is so alkaline it is great as dissolving organic materials. Safety notes: Dont use an aluminum pan. When the liquid stops bubbling, remove the metal from the container and wipe off any excess liquid. Thermometers and stirring tools are also needed, as well as something to heat up the tanks. 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. of the steel than do not even try this on something that is anything other than artistic in nature! 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. Participated in the Explore Science Contest. I rarely use them. 2. We use cookies to make wikiHow great. He has more than three years of experience writing for and working with wikiHow. It is named after the blue-black appearance of the resulting protective finish. Thanks for always being so willing to share, Sir. For most of the time, guns that utilize carbon steel components are the prime candidates for bluing but its totally possible to color stainless steel blue as well. Last Updated: May 13, 2022 I plan on doing this on a couple of older beaters first. This is not necessary as long as you can hold your item appropriately and not cover where it is to be heated. Technically speaking, bluing is more or less a conversion of red iron oxide (Fe2O3) to black iron oxide (Fe3O4). (And taking, out of *your* hide). Heating white, degreased steel to 550 to 600F results in brilliant colors. Fume bluing is another process similar to rust bluing. Also: Do not allow the solution to run, drip or sag. WD-40, as mentioned earlier, is a water-displacing oil compound not a penetrating lube, and for preventing rust, WD-40 actually works pretty well, but it doesnt last like cosmoline or waxy oils used for long-term rust prevention. The name of the process actually comes from the blue-black appearance of the black iron oxide. I use kerosene to wet my paper from 500 on up. the cost of the burners or heaters to heat up all these tanks really only practical if you have natural gas available Spray down the whole barreled action with copious amounts of WD-40, inside and out. I had to sand and restain the stock, and sanded the barrel from 120 down to 400 grit the pitting was so bad. You can then use a soft brush to gently remove all the residue of the cleaning solution on the components. Question What is your opinion of the 2 to 1 lye and potassium nitrate bluing solution? Then you have to heat the metal. occasionally I'll buff it afterwards. All those materials the leather and bone the coal where sources of carbon and other trace elements. Dont leave cold blue solutions around anywhere pets or kids could get at them. Is the torch used to heat metal ..ONLY.with Cold bluing? Drop a piece of hot charcoal in it and it will burn in the absence of any atmosphere as the nitrate provides the oxygen for the reaction. I have to finish my M76 and Galil first and buy the materials. Im not responsible for marital discord as a result of gun projects attempted on the kitchen stove. Its oiled in production to keep it from rusting on store shelves. Here is a video by Clevinger Customs illustrating it: I use the Brownells nitre blueing salts, which are a combination of sodium nitrite, sodium nitrate, and potassium nitrate. Todos los derechos reservados. 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. This answer was tested with a utility knife blade and it drilled through with ease. The use of stainless steel alloy varies a lot from one manufacturer to the other and thats why the bluing effect wont always be consistent. Rinse them in a cold water tank after. 4 years ago NaOH will quickly and completely dissolve aluminum. When youre using hot blueing salts, youd better be on top of your game, or you can seriously injure yourself. ", You turn up your nose at crap guns? It's worth noting that there can be some additives in motor oil that release hydrocarbons when burnt which is a known carcinogens to the body (in other words: Bad Stuff!). ", the wrong quality steel. I can then get the temp to be 600F spot-on in a lead melting pot. You wouldnt need salts. Have proper ventilation and use proper modern safety gear! 8 years ago wikiHow is where trusted research and expert knowledge come together. The colours range through straw, gold, brown, purple, blue, teal, then black. You should keep guns in a safe, if you can. Hot. If cold bluing is the only practical option, the area should be kept oiled to extend the life of the coating as much as possible. The mixture is heated to 310 to 321C (590 to 610F) and the parts are suspended in this solution with wire. You will get it. tighter your arc, the less the heat input will be. Bluing may be applied by immersing steel parts in a solution of potassium nitrate, sodium hydroxide, and water heated to the boiling point, 275310F (135154C) depending on the recipe. For more information on using a blowtorch and protecting the steel, scroll down! 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. 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. The parts can often be put together with little or no forces need and friction lock together and the one parts shrinks and the other part expands. I use it, oh so cautiously in making my biodiesel. He started the site to explore the ethics, morality, business, politics, culture, technology, practice, strategy, dangers and fun of guns. You can not do this method with Aluminium because it won't reach the temperatures required for bluing, it will just melt. Thats how vigorously we de-grease guns before starting blueing. Knowledge is the power and fear is the opposite of power it cripples the mind and the body and almost always guarantee's a poor decision will be made. This signifies that the steel is tempered. Hot blueing salts attack soft solders on guns, so it isnt to be done on old shotguns and some older rifles. 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. The process isnt intended for bronze. Drift the sights back in from the right side of the barrel. It also looks good on AK type weapons of which I have three to park. : Make sure it is made from Mild Steel or Titanium. Bluing is a process usually used by gun owners and firearms manufacturers to improve the aesthetic value of their weapons. They have their place, but doing a whole gun with them isnt that place. Oil and grease really are the enemy because youre trying to (literally) corrode the metal. Wear disposable nitrile gloves, work in adequate ventilation, bag and dispose of all rags/towels used in the process in their own bags, and quickly. 1/16-inch pivot wire has a circumference of ~0.2in. These include hot bluing, cold bluing, niter bluing, and so on. These processes were later abandoned by major firearm manufacturers as it often took parts days to finish completely, and was very labor-intensive. You can make a Caustic Soda KNO3 water bath: 65% Lye (aka sodium hydroxide) { This is an alternative method for creating the black oxide coating. The melting point for KNO3 is 633F. "@type": "ImageObject", Go on and start bluing! on Introduction. Youll want to clamp on the barrel directly under the sight youre about to drift out. If you look at the temps that Tenifur(SP) and Melonite(sp) and early Pakerizing processes used this is nothing. My advice to people here: Unless youre a professional, and youre working in a shop with all the required safety gear (a cold water shower within a couple feet of the tanks, and an eyewash station next to the tanks, and someone working in the same shop every moment youre working on the salt tanks), DONT. After three coats, washing and drying, the finish was not too bad, considering I was (and am) a rank amateur. The head is fixtured and and an arm holding the valve seat moves the the proper location. you may benefit from the use of a gas lense as well. Either that or the steel wool. I have always wondered about storage in gun soft cases or the foamed Hard cases, and humid or dry, heat and cold. If you need to use a blow torch, focus the flame tip on the area you want hardened. It had been thoroughly degreased before my first attempt, but in trying to repair a poor result, I apparently contaminated it a bit. Once the solution reaches its boiling point, turn down the burner to about one-third of the boiling temperature and let it stay there. It will instantly vaporize into steam and splash all over you. Heating up a tank on the kitchen stove. Slow rust blueing can take a week or more to accomplish, but it is a durable blue job like no other. 6 years ago. 1. polish it very well 2. clean very well 3. quick dip in dilute FeCl (4:1) is what I use 4. rinse in cold running water and pat This is a great source that you can learn lots of information from and I'll advise it to to a handfuls of others. When heat treating a forged blade you get the whole knife glowing, then submerge just the blade in the oil for 8 seconds. *700F is very close to the heat treatment temperature of some steels. Let them cool down as you take a closer look at the bluing effect. 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. If you are referring to torch bluing, the In literally 10 seconds on a buffing wheel incorrectly applied, I could screw that up to a point where it might take be eight+ hours of hand polishing to recover my prior results. Dont just leave them on a surface that could corrode or burn), get a new patch into the hemostats, soak, wring out, and keep going. Use your torch to bring up Brownells has steel tanks, and there are some steel/stainless long/thin tanks available from other sources. [ You can use a heat gun, a blow dryer, or a torch for this. References Remove any previous finish. 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. After There wasnt a whole lot of pain just yet until my buddy took the safety bottle of vinegar solution used to neutralize the alkaline NaOH salts, and then the pain was there. Acetone is also useful for de-greasing the barreled action. Pull it out of the tank and place on a drain rack. Its durable and wears well. Color case hardening is the predecessor of all metal coloring typically employed in the firearms industry. Enjoy! Every true outdoorsmans dream! The wire is extremely small in diameter, so you have to take that into consideration. Depending on the manufacturers manual, youll have to prepare roughly 6 to 8 tanks to perform the bluing effectively and efficiently. it takes a long time to heat up a long (ie barreled action length) tank that is, oh, three barrels wide. 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. That can be a pen torch (pictured), a blow torch, a heat gun, a gas hob (which I am going use) or anything that will provide you with enough heat. "@type": "Article", You want 0000 steel wool for carding between coats. The easier of the two methods, hot bluing only requires some degreasing agent, a heating apparatus (a blow torch is perfect for this), and any kind of oil. In the nitre bluing process, polished and cleaned steel parts are immersed in a bath of molten saltstypically potassium nitrate and sodium nitrate (sometimes with 9.4 grams (0.33oz) of manganese dioxide per pound of total nitrate). This process was repeated until the desired depth of color was achieved or the metal simply did not color further. Bluing also helps to maintain the metal finish by resisting superficial scratching, and also helps to reduce glare to the eyes of the shooter when looking down the barrel of the gun. Should something happen, seek medical help right away. On another thread, we can go into nitre blueing, which is basically heating pins/screws/bits/bobs to 600F in a molten salt bath. }. Woodworkers doing furniture finishing will use 000 and 0000 wool, and they hate oil on their wool for rubbing down oil finishes. I have also had good results with 5w/30 motor oil, I've also used two-stroke oil with good results. Before you start, it might do you well to mark the sight base on each side of the dovetail with a Sharpie marker, so you can see when the sight begins to move. The robot gives the steel valve seat a quick blast with liquid nitrogen and drops the seat right in place. 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). This works well for me. (Its Crystalline Potassium Nitrate 100%) $6.18 I'm a professional knifemaker and use many very high-temp methods including quenching 1,600F steel in pre-heated oil - I know what I'm talking about, 'cause I still have 10 fingers and my eyesight. Heat the area you'd like to drill just until it starts to glow red, then allow it to cool slowly. Not blessed with a climate controlled safe. You should note that the blue layer is rather delicate so dont treat it roughly. *Potassium Nitrate is an oxidizer. Next comes the main part. The inside barrel was saved by the fact it was so full of lead fouling. With. Ill wait for and look forward to your article!
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