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ISO 1083 - 2004 standard for Ductile Iron Material Grades and Properties

ISO 1083 -2004 is the latest standard for ductile iron material grades, mechanical and chemical properties. As for the previous version, please refer to ISO 1083 - 1987.

The current ISO standard for ductile iron, ISO 1083, specifies grades either by tensile strength, proof stress and elongation or Brinell hardness. Tensile strength is by far the more common specification. The following table shows the range of grades available within the current ISO standard, by tensile strength. 

Material
Designation

Tensile Strength
N/mm²

Proof Stress
N/mm2

Elongation
%

ISO 1083/JS/350-22/S

350

220

22

ISO 1083/JS/400-18/S

400

250

18

ISO 1083/JS/400-15/S

400

250

15

ISO 1083/JS/450-10/S

450

310

10

ISO 1083/JS/500-7/S

500

320

7

ISO 1083/JS/550-5/S

550

350

5

ISO 1083/JS/600-3/S

600

370

3

ISO 1083/JS/700-2/S

700

420

2

ISO 1083/JS/800-2/S

800

480

2

ISO 1083/JS/900-2/S

900

600

2

 Table A.1 Classification as a function of hardness

 

Material designation

Brinell hardness range
HBW

Other properties a,b

Rm
N/mm

Rp0,2
N/mm

ISO 1083 /JS/ HBW 130

Less than 160

350

220

ISO 1083 /JS/ HBW 150

130 to 175

400

250

ISO 1083 /JS/ HBW 155

135 to 180

400

250

ISO 1083 /JS/ HBW 185

160 to 210

450

310

ISO 1083 /JS/ HBW 200

170 to 230

500

320

ISO 1083 /JS/ HBW 215

180 to 250

550

350

ISO 1083 /JS/ HBW 230

190 to 270

600

370

ISO 1083 /JS/ HBW 265

225 to 305

700

420

ISO 1083 /JS/ HBW 300

245 to 335

800

480

ISO 1083 /JS/ HBW 330

270 to 360

900

600

NOTE 1 N/mm=1 MPa

Chemical composition

The chemical composition of spherical graphite cast irons is not specified by this International standard. Chemical composition will vary depending on the method of manufacturing (charge materials, casting dimension, etc.). Table A.2 shows one example of the chemical composition of ISO 1083/JS/500-10 in order to fulfill the requirements for tensile strength, elongation and harness. 

Table A.2-Example of chemical composition

C %
approx

Si %
approx

Mn %
max

P %
max

S %
max

Mg %
approx

Cu %
max

3.3

3.7

0.3

0.05

0.02

0.04

0.1

 Table A.3-Minimum impact resistance values measured on V-notched test pieces machined from separately cast samples.

 

 

Material

designation

Minimum impact resistance values

room temperature
(23
± 5)

low temperature
(-20
± 2)

low temperature
(-40
± 2)

Mean value from 3 tests

Individual value

Mean value from 3 tests

Individual value

Mean value from 3 tests

Individual value

ISO1083/JS/350-22-LT/Sa

-

-

-

-

12

9

ISO1083/JS/350-22-RT/Sb

17

14

-

-

-

-

ISO1083/JS/400-18-LT/Sa

-

-

12

9

-

-

ISO1083/JS/400-18-RT/Sb

14

11

-

-

-

-

NOTE 1 The impact resistance values for these materials apply to castings cast in sand moulds of comparable thermal behaviour. Subject to amendments to be agreed upon in the order, they can apply to castings obtained by alternative methods.

NOTE 2 Whatever the method used for obtaining the castings, the grades are based on the mechanical properties measured on test pieces machined form samples separately cast in a sand mould or a mould of comparable thermal behaviour.

NOTE 3 These material grades may be suitable for some pressure vessel applications (For fracture toughness, see Annex C.)

a LT for low temperature

b RT for room temperature

 

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