Why would folding shit pig iron a million times make it any better?

>>31927924
>not understanding the properties of metallurgy

It's obviously going to be inferior to contemporary western techniques but it was an effective way to make a strong, hard, sharp blade with extremely poor quality steel

>>31927924
It's not pig iron that's folded, it's an iron bloom. The folding ensures a homogeneous percentage of carbon throughout the iron.This doesn't make it extra special, it just makes the metal behave as a single bar of steel, rather than a bar of iron with steel pockets in it.
tl;dr, it's the only method of refining a (low grade) iron bloom.

>>31927924
also, you dont know what pig iron is

>>31927924
Why do people who don't know jack about metallurgy talk about ho to work with metal?

>>31927924
It would basically make it as close as possible to monosteel.
And it's not folded a million times. Only about 10. Which results in 1024 layers. Cause, you know, 2 at the power of 10 is, like, 1024.
But those layers don't matter anyway. Cause, you now, the folding process is not about the number of layers but about making the material as homogeneous as possible. Kinda like monosteel.

>>31927924
It can slice through ten men in one stroke.

>>31927924
Threads like this are just as bad as threads made by swordfags themselves.

did japan even have pigs back then?

>>31927924
oriental magic. Power of their ancestors and stuff.

>>31927924
Their tamahagane steel has pockets of very high carbon steel mixed with shit iron. Folding homogenizes the steel, spreading the carbon content and impurities more evenly thoughout, and giving the steel a beautiful layered grain. That is all it is intended to do. Everything elsr is just memery.

How the fuck did they deal with rust without adding chromium to the blade?

>using any steel other than stainless steel

>>31928868
Regular maintenance/cleaning.

If it did show signs of corrosion, then they just take it to a sword smith.

>>31928868
polishing. lots and lots of polishing.

followed by regular care and maintenance. the japanese in particular ritualised that to the extent of obsession, because the climate is hellish for carbon steels - and hence a lot of ancient japanese swords are still shining and polished today. European swords were maintained as well, but not to the same degree of mania.

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>>31928868
>using stainless steel as a sword
T. Doesn't know shit about blades

>>31928868
t. I bought a wall hanger and I gots ta shill it

Im gonna comandeer your thread faggot.

What types of steel are used in different parts of a firearm?

Is the barrel, reciever, and action always the same type of steel?

What about heat treament?

What dies heating up the barrel repeated do to the steel and subsequently the life of the barrel?

>>31928689
Possibly. The Chinese had domesticated pigs. Plus, they've been trading with the Dutch since 1609.

>>31928689
http://www.japantimes.co.jp/life/2011/10/28/food/pig-in-japan-the-nations-most-popular-meat/

>>31929434
Short bursts of heat are not going to do much to a barrel. Cold is what kills metal (if not done properly), especially fast cold. You might have heard stories of people pissing on MGs to cool them - that is rapid cooling and it is going to harden the barrel and make it brittle.

>>31929573
Neat, i know that open bolt firearms heat more slowly than closed, heat is the enemy of automatic weapons.

So i wonder if cooler air could be forced through a barrel between cycles?

>>31929647

isn't that what the lewis gun did?

>>31927924
they separate the flimsy with the brittle and put the brittle on the inside while re-hammering the flimsy on the outside so it flexes and they can make it longer than the metal would normally allow

it still bent when it hit bone so they still used spears mainly and slaughtered the defenseless with swords

just like the christian sword, the most casualties to the jap sword were civilians, except the jap sword has more child casualties

>>31929681
I havent the slightest idea anon.

>>31929647
Something like that is done on some naval guns: a jet of fresh water is sprayed down the barrel after firing and before loading the next shell. But naval guns are not very portable or rapid firing.
There is the however the other method of cooling the outside of the barrel like the Lewis MG that uses a jacket around the barrel through which air is forced, also the PKP/Pecheneg that uses somewhat the same method and, to get back in the navy, some of the russian CIWS that use watercooling for their 1-2 gatling guns. But none of those will guarantee a capability to fire for ever and ever since there is a limit to how much heat you can transfer away from the barrel/s.

>>31929681
It did it the other way around: air was forced around the barrel not through it.

>>31929681
From Wikipedia (inb4unreliable, lrn2research):
>The gun's aluminium barrel-shroud caused the muzzle blast to draw air over the barrel and cool it, due to the radially-finned aluminum heat sink within the shroud's barrel, running lengthwise in contact with the gun barrel from the "bottleneck" near the shroud's muzzle end and protruding externally behind the shroud's rear end. There is some discussion over whether the shroud was really necessary—in the Second World War, many old aircraft guns that did not have the tubing were issued to anti-aircraft units of the British Home Guard and to British airfields, and others were used on vehicle mounts in the Western Desert; all were found to function properly without it, which led to the suggestion that Lewis had insisted on the cooling arrangement largely to show that his design was different from Maclean's earlier prototypes.[13] Only the Royal Navy retained the tube on their deck-mounted AA-configuration Lewis guns.[14]

>>31929781
Ayy lmao.

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>>31927924
>The Japanese used pig iron to make their katanas
MFW this meme will never die.

Folding the iron doesn't make it "better" as much as it makes it "less shit." The folding process hammers out impurities in the pig shit iron, but it also hammers out the carbon.

>>31927924
>iron
Here's your (You), faggot.

>>31929865
The process of hammering actually increases carbon content, as the repeated heating happens in a reducing environment. Ancient sources actually talk about how you can refine steel from iron by repeatedly hammering away at it. Of course, what was actually happening was carbon diffusion from the charcoal fire.

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>>31929647
I don't see how you could pull air through a barrel unless you used some sort of piston mechanism, which would invariable involve venting hot gas out the block first.

Maybe have inline-pistons, one traveling backwards to cycle the action, and one forwards to vent gas and pull air in when it returns? The design would greatly add to the weight of the firearm, but the physics involved would also mitigate recoil.

Here's my autistic drawing of the idea. The problem is the necessity of venting gas all over the place.

>>31929647
I suppose you could attach a bore evacuator, but why bother? We already have many myriad solutions to overheating barrels, and any solution involving using air as a cooling medium would be inefficient.

They didn't make the entire sword out of pig iron, you retard
They added it at the end to increase the carbon content after it was all hammered out, and then hammered more to spread it back out amongst the blade and reduce pockets of impurities

They made steel so strong they attached the blades onto the wings of their planes to slice off the wings of American aircraft.

>>31930245
>shamefur dispray
Not the wings retard.
They only sliced off the machine gun barrels in the wings to prove the cutting power as well as the precision of the katana.

>>31929434
heating the barrel only changes the metallurgical properties if it gets to 700 degrees and above. constant heating and cooling could cause residual stresses due to expansion and contraction of the barrel though, which leads to cracking, which leads to failure