12 years ago
I got this from wikipedia rail profile:
"The American Railway Engineering Association (AREA) and the American
Society for Testing Materials (ASTM) specified carbon, manganese,
silicon and phosphorus content for steel rails. Tensile strength
increases with carbon content, while ductility decreases. AREA and ASTM
specified 0.55 to 0.77 percent carbon in 70-to-90-pound-per-yard (35 to
45 kg/m) rail, 0.67 to 0.80 percent in rail weights from 90 to 120
pounds per yard (45 to 60 kg/m), and 0.69 to 0.82 percent for heavier
rails. Manganese increases strength and resistance to abrasion. AREA and
ASTM specified 0.6 to 0.9 percent manganese in 70 to 90 pound rail and
0.7 to 1 percent in heavier rails. Silicon improves steel by increasing
density. AREA and ASTM specified 0.1 to 0.23 percent silicon. Phosphorus
and sulfur are impurities causing brittle rail with reduced
impact-resistance. AREA and ASTM specified maximum phosphorus
concentration of 0.04 percent."
Is there any disagreement with that?
Interesting to me: I got 6 cuts with one Doall Imperial 100 band saw
blade in used 88# (or so) rail before it started to go dull. I'd guess
that means that those rails are NOT fully hardened when they leave the
mfr and that they don't work harden to the point where they are fully
hard by the time they are removed from service?
Why do I have that much rail laying around? It's the left over from my
son's 39 foot high Tyranosaurus Rex. He used 2 18 foot lengths to
reinforce the legs.