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Ductile Iron 65-45-12

Ductile Iron 80-55-06

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Gray Iron Class 40

PACIFIC Cast Iron is stocked in both gray and ductile (nodular) grades. Both types machine well plus exhibit good compressive properties and excellent damping characteristics. Continuous casting virtually eliminates typical casting problems of porosity, surface flaws and shrinkage. Both gray and ductile iron can be considered for replacing steel, aluminum and bronze in many applications. Benefits are better machinability and lower costs. Gray iron is classified by its tensile strength (class 40 is nominally 40,000 psi). Ductile iron is classified by its nominal strengths and ductility (grade 60-45-12 is nominally 60,000 psi tensile strength, 45,000 psi yield strength and 12% elongation). Both class 40 gray iron and 80-55-06 ductile iron can be hardened by furnace heat treating and by flame or induction hardening. As cast bars have machining allowance to clean to nominal size.

Chemical Composition

Heat Analysis - ranges and limits %

Gray Iron

C

2.9/3.7

Mn

.50/.80

Si

1.6/2.7

Ductile Iron

C

3.6/3.9

Mn

.10/.40

Si

2.3/2.8

Other elements added as required to produce microstructure and mechanical properties

Typical Brinell Hardness

Size

(Inches)

1.5 - 2

.

2 - 3

.

3 -6

.

6 - 10

.

10 - 20

.

Gray Class 40

207/269

197/262

197/262

183/262

183/262

Ductile

(65-45-12)

153/220

153/220

143/220

131/220

131/220

Ductile

(80-55-06)

217/262

217/262

207/255

207/255

187/255

Processing Temperatures

Typical

Harden

1575/1675°F

quench in agitated oil

Temper

375/1200°F

Anneal

1500/1650°F

and furnace cool

Stress Relieve

1050/1100°F