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Goodbye, Brass?

KevinKohler said:
Even CHEAP (Chinese) stainless is at best, very mildly attracted by a magnet. These casings are advertised as being able to be picked up by a magnet for ease of retrieval. Gotta be pretty high iron content, and low low low on everything else for that to work.
Chromium and nickel are the two primary add ins to make steal stainless. And from my exp, "stainless" steal that can be picked up by a magnet...rusts like any old piece of iron. And the things that don't rust, like my pocket knife, or the internals of a saltwater marine motor...are not affect by a magnet hardly at all.


I am dubious.
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Magnetic Response

Magnetic response is the attraction of steel to a magnet. Austenitic grades are generally not magnetic although a magnetic response can be induced in the low austenitic grades by cold working. High nickel grades like 316 and 310 will remain non-magnetic even with cold working.

All other grades are magnetic.

Austenitic Stainless Steels

Austenitic stainless steels contain a minimum of 16% chromium and 6% nickel. They range from basic grades like 304 through to super austenitics such as 904L and 6% Molybdenum grades.

By adding elements such as Molybdenum, Titanium or Copper, the properties of the steel can be modified.

Ferritic Stainless Steels

Ferritic stainless steels include grades like 430 and contain only chromium as a major alloying element. The quantity of chromium present ranges from 10.5 to 18%.

Ferritic stainless steels are magnetic. They are also not susceptible to stress corrosion cracking.

Martensitic Stainless Steels

High carbon and lower chromium content are the distinguishing features of martensitic stainless steels when compared with ferritic stainless.

Martensitic stainless steels include 410 and 416. Hardened martensitic steels cannot be successfully cold formed. They are magnetic, have moderate corrosion resistance and poor weldability.

Duplex Stainless Steels

Duplex stainless steels have high chromium and low nickel contents. This gives duplex stainless steels microstructures that include both austenitic and ferritic phases. They include alloys like 2304 and 2205. These alloys are so named due to their respective compositions - 23% chromium, 4% nickel and 22% chromium, 5% nickel.

By having both austenite and ferrite in the microstructure, duplex stainless steels feature properties of both classes. Although a compromise between the two ‘pure’ types, duplex grades can offer some unique property solutions. Duplex grades are resistant to stress corrosion cracking, but not to the same level as ferritic grades.

Precipitation Hardening Grades

Precipitation hardening grades contain both Chromium and Nickel. They develop very high tensile strengths with heat treatment. Precipitation hardening grades are usually supplied in a “solution treated” condition that allows the steel to be machined. After machining or forming, the steel can be aged in a low temperature heat treatment process. As the heat treatment is performed at low temperatures, no distortion is induced in the work piece.

630 is the most common precipitation hardening grade This grade is also known as 17-4 PH due to a composition of 17% chromium, 4% nickel, 4% copper and 0.3% niobium.

Stainless Steel - General Information - St St Introduction
 
A much more in depth explanation....of what I already said. Long story short...less iron, more alloys....less rust, and less magnetic. More iron, less alloys, more rust, and more magnetic.

Corrosion resistant simply means, it'll take a little longer than plain steal to rust.


I'll restate....if these casings can be picked up by a magnet, then they will be prone to rust. Period. Which is fine, if you store your ammo in a cool, dry place.
 
KevinKohler said:
A much more in depth explanation....of what I already said. Long story short...less iron, more alloys....less rust, and less magnetic. More iron, less alloys, more rust, and more magnetic.


I'll restate....if these casings can be picked up by a magnet, then they will be prone to rust. Period. Which is fine, if you store your ammo in a cool, dry place.
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Corrosion resistant simply means, it'll take a little longer than plain steal to rust.
or leave them in the "sardine cans" that they often come in

btw stuff like 420 stainless is very resistant to rust and is strongly attracted to a magnet. 420HC is better for knives and is now used in the Gerber MK II instead of stuff Like D2

(I am into knives and my father was a metallurgical engineer so I sort of understand this stuff)
 
TurtleDude said:
Corrosion resistant simply means, it'll take a little longer than plain steal to rust.
or leave them in the "sardine cans" that they often come in

btw stuff like 420 stainless is very resistant to rust and is strongly attracted to a magnet. 420HC is better for knives and is now used in the Gerber MK II instead of stuff Like D2

(I am into knives and my father was a metallurgical engineer so I sort of understand this stuff)
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420HC is more corrosion resistant than iron, I'll grant you....but not something I'd want our military to have. In addition, it's brittle...I don't think it'd make good casings. Just my opinion, though.


Personally, I simply think the claim that these casings can be retrieved with a magnet is probably exaggerated.
 
KevinKohler said:
420HC is more corrosion resistant than iron, I'll grant you....but not something I'd want our military to have. In addition, it's brittle...I don't think it'd make good casings. Just my opinion, though.


Personally, I simply think the claim that these casings can be retrieved with a magnet is probably exaggerated.
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The carbon level is higher for 420 and it can be hardened more. I would think that in the use for cases it probably is not hardened at all. The problem with steels is the spring back after being stretched. The material needs to be good at that to make for good case material or special chambers with more clearance are required. Having to much clearance will shorten the life of the case. A heap of problems need to be solved.

The magnetic properties of stainless are a composition thing but some are very magnetic and a good magnet will get them and probably a bunch of other unwanted stuff.
 
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