On Wed, 18 Oct 2017 16:30:06 -0500, Martin Eastburn
wrote:



On 10/18/2017 10:39 AM, Gunner Asch wrote:
On Wed, 18 Oct 2017 06:55:58 -0500, Ignoramus4513
wrote:

On 2017-10-18, Martin Eastburn wrote:
If you buy metal from these and in little chunks you pay more
and a lot more.

I used to buy AR500 (expensive) by the 4x10' have it cut into 4
so I could carry it. 3/8" thick weighs like 1/2" A36. It is
extremely dense and full of exotic metal. It is a registered
product. (with the FBI).

I bought mine from a MILL company. They barge the large sheets
in and use 80' rail cars to tote them from the barge to their
facility.

Martin, composition wise, it is a steel with a little extra manganese
and bits of nickel and moly, I cannot see how it should be so dense.

https://www.google.com/url?sa=t&rct=...FVvEeVkL3 q0U

Per cubic foot:

Steel, Cast/Rolled 490.00 lbs
Nickel 555.72
Manganese 463.10
Molybdenum 637.63





Martin
AR 500 is far more complex than that. It contains secret amounts of
many of the high end metals.
Your Mang and Moly are in rows 4 and 5 along with Cr and Vanadium and
Iron and Colbolt. Baby stuff for keeping out large bullets.

Try atomic numbers 104 - 108, 58-60 and all of yours.

Massive Atoms are Heavy. They also tend to stick together. e.g. U92 is
near by and it takes a Boom to make it split apart.
Hf (72) Hafnium is used as a source of electrons in Plasma torches.
You add electrons to it and it showers that amount back to the tip.

https://www.chapelsteel.com/ar500-ar500f.html
https://www.chapelsteel.com/weight-steel-plate.html
AR500 / AR500F
AR500 and AR500F are quenched & tempered through hardened wear resistant
grades of abrasion resistant steel plate used for severe impact and
abrasion. Chapel Steel's premium grade of these products are Chapalloy
500 and Chapalloy 500F. Chapel Steel recommends the “F” chemistry in
applications where there will be forming or higher impact.
Mechanical Properties:
Tensile: 247 ksi TYPICAL – NOT INTENDED FOR STRUCTURAL USE
Yield: 187 ksi TYPICAL – NOT INTENDED FOR STRUCTURAL USE
Elongation: 11.1% in 8”
Brinell: 450 min / 500 nominal

Chapel also makes this :
Chapalloy Armor Plate

A proprietary ballistic steel plate which is through hardened, quenched
and tempered and is guaranteed to meet various NIJ and UL
specifications. Acceptance criteria is based on the specification
desired and the thickness of the plate required to meet that standard.

The Houston facility is mostly ship and offshore with armor car and
fixing CAT machines.....
Chapel at :
LOCATIONS

Philadelphia, PA

Chicago, IL

Birmingham, AL

Houston, TX

Portland, OR

Hamilton, ON

Cleveland, OH
Martin

Martin, AR500 is about the same density as any other low-alloy zteel.
As Gunner said, the composition is very mild.

It gets its strength from having carbon-multipliers (chromium, moly
and manganese, mostly) that allow it to be quenched-and-tempered to a
higher hardness than the carbon (0.30) would normally suggest. n that
regard, but not in others, it's like 4130.

There's nothing magic or special about it. It's an abrasion-resistant,
hard low-allow steel with good impact resistance.

--
Ed Huntress