Cast Irons – Specifications for Gray Iron and Ductile Irons from Fonderie Saguenay

Topics Covered

Background
Gray Iron
     Gray Iron Specifications
Ductile Iron
     Ductile Iron Specifications

Background

Fonderie Saguenay are a jobbing shop specializing in producing components in materials such as gray iron and ductile iron. Typical specifications for ductile iron and gray irons are provided below.

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

Source: Fonderie Saguenay

Date Added: Aug 7, 2007 | Updated: Jun 11, 2013
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