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Old 12-02-2010, 10:49 AM   #154
dwayne
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Quote:
Originally Posted by Infracaninophile View Post
Drummer:

Can you elaborate on a few things? The 60-40-18 - Is that just a goal you need to hit in order for this specific batch of metal to be good for the intended purpose? Or, did you or someone just make up these ratios and then see if you can hit it? Is the 60-40-18 a standard mix for certain kinds of applications?

What would happen if this got spilled onto your foot? You mentioned the one person with a burned sock, but I kinda thought this would just burn a hole all the way through anything it touches.

Can you detail for me (unless it's too much work) what these items are:
"To get this, it takes a specific mixture of C, Si, Mn, P, S, Cr, Mo, Ni, Al, Cu, Ti, V, Sn, Mg, Fe, etc. "

I find this thread fascinating and the new pictures are terrific.

Tom
Those are abbreviations for elements.

C=Carbon
Si=Silicon
Mn=Manganese
P=Phosphorous
S=Sulfur
Cr=Chromium
Mo=Molybdenum
Ni=Nickel
Al=Aluminum
Cu=Copper
Ti=Titanium
V=Vanadium
Sn=Tin
Mg=Magnesium
Fe=Iron

All found on the periodic table.

Most metal that we use to make things from are alloy, or mixes of various elements. Different mixes give different properties like density, strength, hardness, toughness, corrosion resistance, thermal and electrical conductivity, and on and on.

For the Ferrous metals, carbon is usually considered the most important alloying element. It, more that any other element, contributes to strength and hardness when mixed with iron. Some of the alloys of iron are Cast iron, Steel, Pig Iron. The difference is defined by carbon content. Very roughly and incompletely <2% C = Steel, > 2ish % =Cast Iron, > 6ish % = Pig.

The primary purpose of refining steel or iron is the control of Carbon, but impurities (like sulfur in most cases) are removed and other things like molybdenum, nickel, and chromium are added to give the steel/iron it's desired properties. Sometimes elements are added to drive others out of the alloy.

Alloys can contain dozens or even hundreds of elements, but not all are present in quantities that have a significant outcome on the material properties, so only the ones that are considered important are referred to.

There are several standards organizations that give numbers to the various mixes that create alloys (like AISI) and numbers like 4130 or 4340 are used to represent these mixes. In this case however the number relates to the properties of the steel

60-40-18

60=min tensile strength in thousands of pounds/in squared
40=min yield strength in thousands of pounds/in squared
18=% elongation in tensile test

www.Ductile.org has a lot of reference info for the type of material he is casting.
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dwayne screwed with this post 12-02-2010 at 01:01 PM
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