Material                 (alloying formula)	aka notations	hardness, ductility	corrosion resistance	color	already used wire diameters [mm]	notes
Note: Not only wires obtained as welding wire (while they might been originally such as well) are shown here; these wire types are marked with a star (*)
Aluminium
* Al	Aluminium fence wire	very soft	high, but see notes	silver, grayish hue	~2.0	'dirty' wire, gives blackish rub-off
Al99.5Ti	3.0805, AL1450	very soft	high	silver, grayish hue	1.2, 1.6	polishable, but quick redulling - and gives ruboff
SG-AlMg3	ER-5154, 3.3536	inbetween Al and ALMg5	high	silver, shiny	1.6	fairly ok, better than pure Al or AlSi anyway
SG-AlMg4,5Mn	ER-5183, 3.3548	springy, half-hard to hard	high	silver, very shiny	0.8, 1.0, 1.2, 1.6	my currently favourite Al-wire, a bit higher hardness, and higher toughness than standard BA, even tends to break if bent over edges
SG-AlMg4,5MnZr	ER-5087	springy, half-hard to hard	high	silver, very shiny	1.0, 1.2, 1.6	similar, if not a bit harder than my top favorite. Tumbles to the highest shine of all BA alloys.
SG-AlMg5	ER-5356, 3.3556	springy, half-hard	high	silver, shiny	1.0	another of my favorites, this alloy is the usual "standard BA"
SG-AlSi5	ER-4043, 3.2245	relatively soft compared to AlMg* alloys	medium, darkens a bit with aging	silver, shiny with a bit grayish hue	1.6	not very good for anodizing, and imho also too soft for maille.
Copper
* Cu	Electrical wire (salvaged)	very soft	principally high, but not corrosion resistant	copper-typical, reddish, tarnishes quickly, on some people up to near-black	~1.4, ~1.7, ~3.6	nearly no springback
SG-CuAl8	"Aluminium Bronze" 2.0921, ERCuAl-A1, CastoMag 45751	hard, spring temper, but very ductile and tough as well - somewhat beasty	high; sea-water resistant, but tarnishes as well	golden, brass-like,  tarnishes slowly to light bronze-tone, sometimes slightly greenish when aged	0.8, 1.0, 1.2, 1.6	HIGH springback; alloy is very similar to 'nordic gold' as used in e.g. 10, 20, 50 Eurocent, or 2AUD coins; see http://www.predecimal.com/euroarticle.htm
CuSn1	S ERCu	relatively soft for Bronze, very ductile, hard enough for maille	high; tarnishes like pure Copper does	Copper-like; tarnishes slightly more brownish than pure Copper	1.0, 1.2, 1.6	As springback and hardness are very similar to good Bright Alu, same nominal wire/mandrel data lead to similar resulting rings. My personal favorite Bronze
CuSn6 / CuSn5P	S ErCuSn	half-hard and tough	high; tarnishes to a deeper brown, compared to Copper	Copper-like; tarnishes brownish	0.8, 1.2	Good universal Bronze
CuSi3		half-hard and tough	tarnishes to a deep brown	golden, but tarnishes to a deep brown hue	0.8, 1.0	Not my favorite, except extra-dark tarnishing rings are asked for
Iron/Steel
SG-2	ER-70, 1.5125, G3Si1,  "common MIG wire"	medium	low	copper-like	0.6, 0.8	Copper plated mild steel, plating rubs off quick, remaining wire rusts "as hell"
SG-X10CrNiMn19-9	ER-307(mod.), 1.4370, Thyssen Thermanit X	not really hard, but very tough	excellent	iron, a bit darker than 1.4316	1.0, 1.2, 1.6, 2.4	My favourite Stainless wire, used also as WIG-rods (1.6, 2.4) - a bit softer temper as same diameter MIG-wire
		spring temper and tough		slightly matte	1.2, 1.6	newer MIG wire batches I recently got - need a thorough tumble to become shiny
SG-X5CrNi19-9	"18-8", ER-308L, 1.4316, "V2A"	tough, smaller diameters springy half-hard	excellent	iron, shiny	0.6, 0.8, 1.0	good stuff, 1mm VERY springy
SG-X10CrNi22-12	ER-309(mod.), 1.4829, Thyssen Thermanit D	relatively soft, compared to other Stainless	excellent	extremely shiny	1.2	soft' is meant as 'not springy'
SG-X2CrNiMo19-12	ER-316L, 1.4430, "V4A"	springy, like ER-308	excellent	iron, very shiny	1.0, 1.2	similar to "surgical steel"
SG-X10CrW9-2	T92, P92, Thyssen Thermanit MTS616	springy, a bit harder than 1.4316/1.4370	good, but not 100% rust free	silver, very shiny	0.8	nearly nickel-free (may be anti-allergen); got it by chance, but like it
Titanium
* Ti6Al4V	Ti Grade 5	springy and tough	excellent	gray, usually slightly matte - in anodized state a wide palette of achievable 'pastel' colors, as the material stays matte	0.65, 0.9, 1.2	Titanium is hypo-allergic, and can be anodized for dye-less coloring
Else
* Niobium	formerly known as Columbium	tough, but not really hard	excellent	grayish, but shiny; very similar to stainless steel - in anodized state a wide palette of vibrant colors achievable	0.5, 0.6, 0.8, 1.0, 1.2	Niobium is hypo-allergic, and can be anodized for dye-less coloring, colors very vibrant compared to Ti