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Cast Iron Specification

May 17, 2017

Gray Iron

Gray iron is the original and most common cast iron, so named because of its fracture surface which is typically dark gray in colour. Due to its high carbon content, it has ‘flake graphite’ in its structure. The formation of the flakes or nodules of graphite can be suppressed in part by rapid cooling.

Gray Iron Specifications
Specifications Typical Properties
Tensile Strength Mpa(Ksi) BHN Hardness
ASTM A-48
CL 25 185(27) 170
CL 30 225(33) 175
CL 40 295(43) 180
ASTM A-319
CL I TYPE A 185(27) 175
CL I TYPE B 200(29) 180
CL II TYPE C 290(42) 190
ASTM A-278
CL 25 185(27) 170
CL 30 225(33) 175
CL 40 295(43) 180

Ductile Iron

Ductile iron was first patented in 1949 after foundrymen searched for the ideal cast iron, which was easy to cast like gray cast iron, but had properties equal to or better than malleable iron. Ductile irons are in fact a family of cast irons characterized by spherical graphite nodules in the structure. These form as a result of the addition of spheroidizers to the cast iron composition.

Ductile Iron Specifications
Specifications Typical Properties
Tensile
Strength
Mpa(Ksi)
Proportional
Limit
Mpa(Ksi)
Elongation % Hardness
BHN
ASTM A-536
GR 60-40-18 430(62) 290(42) 20 170
GR 65-45-12 460(67) 325(47) 14 180
GR 80-55-06 575(83) 400(58) 7 190
ASTM A-395 430(62) 290(42) 20 170
ASTM A-476 575(83) 400(58) 7 190
DIN EN 1563
EN-GJS-400-18-LT 420(61) 270(39) 20 170
EN-GJS-400-15 430(62) 290(42) 17 170
EN-GJS-500-7 520(75) 340(49) 8 190
EN-GJS-500-3 620(90) 400(58) 4 200

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