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DIN 1692-82 for malleable cast iron

The types of malleable cast iron include black coring and white coring malleable cast iron. White coring malleable cast iron has higher toughness by the decarburization annealing process, and black coring has not decarburization annealing process.

The mechanical property of malleable cast iron is higher than grey cast iron. They are used for impact resistance and vibration resistance of the parts, such as the car of steering mechanism, piston, wheel gear, low pressure valve, pipe joint, and so on.

The following is the grade and mechanical properties of malleable cast iron provided by Dandong Foundry in China for your reference.

Table 1 Grade and mechanical properties of black coring malleable cast iron without decarburization and anneal

Grade

Material No
W-Nr.

Specimen diameter
/mm

Tensile strength
σb ≥ /Mpa

Yield strength
σ0.2 ≥ /Mpa

Elongation
δ≥
(%)

Hardness
≤ HBS

Microstructure

New grade

Old grade

GTS-35-10

GTS-35

0.8135

12 or 15

350

200

10

≤150

ferrite + annealing carbides

GTS-45-06

GTS-45

0.8145

12 or 15

450

270

6

150~200

pearlite (from flake to granular) + ferrite + annealing carbides

GTS-55-04

GTS-55

GTS-65

0.8155

12 or 15

550

340

4

180~230

pearlite (from flake to granular) + annealing carbides, part of ferrite

GTS-65-02

GTS-70-02

GTS-70

0.8165

0.8170

12 or 15

12 or 15

650

700

430

530

2

2

210~260

240~290

pearlite (from flake to granular) + (acinose sorbite) + annealing carbides

Table 2 Grade and mechanical properties of white coring malleable cast iron with decarburization and anneal

Grade

Material No
W-Nr.

Specimen diameter
/mm

Tensile strength σb≥/Mpa

Yield strength σ0.2≥/Mpa

Elongation δ≥(%)

Hardness
≤ HBS

Microstructure

New grade

Old grade

GTW-35-04

GTW-35

0.8035

9

12

15

340

350

360

-

-

-

5

4

3

230

230

230

the range that wider than GTW-40 is allowed

GTW-40-05

GTW-40

0.8040

9

12

15

360

400

420

200

220

230

8

5

4

220

220

220

core part: (from flake to granular) pearlite + annealing carbides

GTW-45-07

GTW-45

0.8045

9

12

15

400

150

480

230

260

280

10

7

4

220

220

220

core part: (flake) pearlite + annealing carbides

GTW-S38-12

GTW-S38

0.8038

9

12

15

320

380

400

170

200

210

15

12

8

200

200

200

decarburization in the condition of Thickness < 8mm CR ≤ 0.3%

 

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