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AS 1831 for Ductile Cast Iron

AS 1831 2007 is an Australian standard for ductile cast iron. The objective of this standard is to specify grades of ductile cast irons by mechanical properties. This Standard is identical with, and has been reproduced from ISO 1083:2004.

This International Standard does not apply to spheroidal graphite cast iron used for pipes, fittings and accessories which are specified in accordance with ISO 2531 and ISO 7186. It does not apply to highly alloyed (austenitic) spheroidal cast irons which are specified in accordance with ISO 2892. This International Standard does not apply to ausferritic cast irons which are specified in accordance with ISO 17804.

Ductile cast iron is also known as spheroidal graphite cast iron, and less commonly as nodular iron. It is a kind of cast material, iron and carbon-based, the carbon being present mainly in the form of spheroidal graphite particles.

The following three tables have shown the main content of this standard, and these information will be useful for the suppliers and buyers for ductile iron castings.

Table 1- Mechanical properties measured on test pieces machined from separately cast samples

Material designation

Tensile strength
Rm
N/mm
min.

0.2% proof stress
Rp0.2
N/mm
min

Elongation
A
%
min

ISO 1083/JS/350-22-LT/Sa

350

220

22

ISO 1083/JS/350-22-RT/Sb

350

220

22

ISO 1083/JS/350-22/S

350

220

22

ISO 1083/JS/400-18-LT/Sa

400

240

18

ISO 1083/JS/400-18-RT/Sb

400

250

18

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

NOTE 1: The values for these materials apply to castings cast in sand moulds of comparable thermal behavior.

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 prices machined from samples separately cast in a and mould or a mould of comparable thermal behavior.

NOTE 3: The mechanical properties of the materials refer to separately cast samples produced in accordance with Figures 1, 2 or 3.

NOTE 4: Elongation values are determined from Lo=5d. For other gauge lengths, see 9.1 and Annex B.

NOTE 5: 1 N/mm 2 =1 MPa

a. LT for low temperature (-20-40)

b. RT for room temperature (23)

Impact test: The particular impact resistance values given in Table 2 for room and low temperature applications, if applicable, shall only be determined if specified by the purchaser by the time of acceptance of the order.

Table 2 – Minimum impact resistance values measured on V-notched test pieces machined from separately cast samples.

 

 

Material designation

Minimum impact resistance values

J

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

ISO 1083/JS/350-22-LT/Sa

-

-

-

-

12

9

ISO 1083/JS/350-22-RT/Sb

17

14

-

-

-

-

ISO 1083/JS/400-18-LT/Sa

-

-

12

9

-

-

ISO 1083/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 behavior. 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 prices machined from samples separately cast in a sand mould or a mould of comparable thermal behavior.

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.

When only hardness is required, the Brinell hardness values shall be as specified in Table 3.

When hardness is required in addition to the tensile properties, the Brinell hardness values shall be as specified in Table 3 and the procedure given in Table 3 is recommended.

Table 3 – 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 300c

245 to 335

800

480

ISO 1083/JS/HBW 330c

270 to 360

900

600

NOTE   1N/mm2 = 1 MPa

a When only hardness is required, these properties are for information

b When hardness is required in addition to tensile properties, these properties provide an introductory step to the procedure given in E.3

c ISO 1083/JS/ HBW 300 and ISO 1083/JS/ HBW 330 are not recommended for thick section castings.

By agreement between the manufacturer and the purchaser, a narrower hardness range may be adopted; a tolerance range of between 30 and 40 Brinell hardness units is commonly acceptable. This hardness range may be wider for grades with a ferritic-pearlitic matrix structure.

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