34
Molesworth’s pocket-book
Notes on Ikon.
CLASSIFICATION OF PIG IKON.
No. 1 (Iron). Fracture dark grey, with high
metallic lustre. Crystals large, with lustre like
newly cut lead; is useful for fine castings), being
easily fused and Üuid when melted.
No. 2 is intermediate between No. 1 and No. 3.
No. 3. Fracture of a lighter grey than No. 1,
with less lustre; crystals larger and brighter at
the centre than at the sides, useful for large
castings.
No. 4 (or Bright). Fracture light grey, with
small crystals and little lustre; is not sufficiently
fusible for casting, and is generally used in the
manufacture of wrought iron.
No. 5 (Mottled). Fracture dull white, with
pale greyish specks and a line of white iron round
the edge of the fracture.
No. 6 (White). Fracture white, with little
lustre; granulated, but with radiating crystalline
appearance. It is the worst, hardest, and most
brittle of the pig irons, and ia only used for the
manufacture of inferior bar iron.
PERCENTAGE OF CARBON IN IRON AND STEEL.
Spiegeleisen.. ..4-3 to 6'9
Swedish Pig...........4‘8
Grey Pig .. .. 2 • 8 to 3 • 5
Mottled and White 2 • 10 to 3 • 0
Refined Iron...........3'0
Puddled Steel, hard ..1*38
Ditto, soft ........... ‘5
Cast Steel ...........1’34
File Steel ........... 1’2
Double Shear Steel .. ’ 7
Masons’Tool steel .. 0'6
Railway Tire .. • 27 to • 32
i Steel Rails .. ..-24to'30
Hard Bar Iron .. .. '4
Ditto, Swedish .. .. "3
Staffordshire Plate .. '19
Armour Plate .. .. '17
; Swedish Bar, soft .. '07
I Low Moor............‘016