What is Bluing steel called when it’s done to guns and knives?
You can check the answer of the people under the question at Quora “bluing a knife“
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Written by: Margaret
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What is Bluing steel called when it’s done to guns and knives?
You can check the answer of the people under the question at Quora “bluing a knife“
About Margaret
blueing ,oxide treatment ,metal treatment finish blued finish,chemical treatment ,.etc. do a search gun finishing/gun blueing
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The best we’ve found on some knives we use is, it is called “Neo Chrome” or Neo-Chromed” metal. Hope it helps. Try Out World’s Best Survival Gear and Knife Sharpeners at http://www.SharpensBest.com
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In the firearms trade, the process is called Blueing. In the general metalworking trades, it’s called a “Black Oxide finish”.
For firearms, the most common process is Hot Blueing, also known as Salt Blueing. In this process, a saturated solution of sodium and potassium salts and water is heated up, and the parts immersed… The steel surface oxidizes the deep blue/black color we call Blueing.
An older process, still used for very fine guns or restorations, but considerably more labor intensive is called acid blueing. Polished parts are coated with an acid solution, and allowed to rust. That rust is wire brushed off (gently), leaving a slightly blued color… The process is repeated a number of times until the desired color is reached. The absolutely GORGEOUS deep, dark, lusterous blues on pre-WWII guns is acid blueing. It was too labor intensive, and was largely replaced by salt blueing.
there are other processes to create the deep black oxide on steel, but those are the major two that account for MOST of the blued finishes seen on steel firearms.
Aluminum parts, on the other hand, are hard anodized… A totally different process.
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It is called…bluing.
There are several types of bluing: cold bluing, rust bluing, instant bluing, niter bluing, French Bluing, etc, etc
The image you have appears to be a German made pistol (Korth) that was highly polished and then niter blued (all parts to be blued are placed in a heated solution at a fairly low temperature and the raw steel turns this pretty color blue over time…it is a very very weak surface effect and does not wear well at all….but it is pretty).
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It’s simply called “bluing.” I watched the process a few years ago. They drop it in a bath of a caustic salt mixture of potassium nitrate and sodium. Afterwards, they drop it in another bath of cold water to stop the process.
The thing which surprised me is that bluing a rifle is essentially putting a controlled and colored rust on it.
You can also call it oxidizing, but when you want the process done, just tell them that you want the gun “hot blued” (as opposed to cold blued).
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What you have pictured is “Heat Bluing”. Where heat alone is used to induce the oxides without a caustic or acid solution.
Blues are induced by heating to roughly 500 – 600f but the exact temperature is highly dependent on the actual alloy.
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In this case I wish Quora would accept one word answers but it’s called bluing. Try looking up fire bluing or nitre bluing.
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Blueing is the forming of magnetite, or “black iron,” on the surface of whatever is to be blued. It is an oxidation, so in simple terms, it is a kind of rust, but one that on its own doesn’t progress and continue to break down.
Blueing is done primarily for two reasons: to give the gun an appealing cosmetic scheme. Blued steel looks nicer than bare steel. It also keeps the gun kind of a neutral tone, rather than glaring, reflective bare steel.
The other reason is that blued steel is more resistant to rust and corrosion than bare steel. This isn’t worth much, for if you touch an unoiled, blued barrel with wet hands, you can come back in a day and see lots of little red spots of rust where you touched the barrel.
Blueing still needs to be protected with oil to ensure that it doesn’t rust. Another reason why it is used is because blued steel is able to bond with and hold the lubricant you apply to prevent rust better than bare steel does.
On this point, it is also done because it is the cheapest available option. Other methods of ensuring your gun does not rust exist and are much more effective, but they are also expensive. Cerakote is top of the line, and to coat a rifle will run you about $300.
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It’s often called just “ gun bluing .” You can also search for electrochemical conversion coatings and black oxide coating .
The end result usually isn’t true blue. After the protective oil is applied to the “blued” steel, it will look black.
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