No picture classification

Gray Iron Specifications

Specifying Body

Spec. No.

Class or Grade

Tensile Strength

Brinell Hardness

Heat Treatment

AE

ASTM

J431 A-159-83

G-2500

25,000

170-229

Not Required

G-3000

30,000

187-241

but optional

G-3500

35,000

207-255

if requested

G-4000

40,000

217-269

DIN

1,691

GG30

43,500-58,000

180-250

Not Required

Grade and mechanical properties of gray cast iron

Grade

HT200

HT250

HT300

HT350

Minimum tensile strength (Mpa)

200

250

300

350

Tensile strength and Brinell hardness (reference value) of gray cast iron with different wall thickness

Grade

Casting thickness (mm)

Minimum tensile strength (Mpa)

Brinell hardness HBS

greater than

to

HT200

2.5

10

20

30

10

20

30

50

220

195

170

160

174-223

HT250

4

10

20

30

10

20

30

50

270

240

220

200

183-241

HT300

10

20

30

20

30

50

290

250

230

190-262

HT350

10

20

30

20

30

50

340

290

260

196-277

Ductile Iron Specifications

Specifying Body

Spec. No.

Class or Grade

Tensile Strength

Brinell Hardness

Heat Treatment

AE ASTM

J434 A-539-84

D4108

60-40-18

60,000

170Max

May be Annealed

D4512

65-45-12

65,000

156-217

Not Required

D5506

80-55-06

80,000

187-255

Not Required

D7003 100-70-03

100,000

241-302

May be Annealed

DQ&T 120-90-02

120,000

As secified

Quenched and Tempered

Grade and mechanical properties of Ductile iron

Grade

Minimum tensile strength

(Mpa)

Minimum Bending strength (Mpa)

Minimum Elongation(%)

Brinell hardness HBS

Main metallographic structure

QT400-18

400

250

18

130-180

Ferrite

QT400-15

400

250

15

130-180

Ferrite

QT450-10

450

310

10

160-210

Ferrite+Pearlite

QT500-7

500

320

7

170-230

Ferrite+Pearlite

QT600-3

600

370

3

190-270

Ferrite+Pearlite

QT700-2

700

420

2

225-305

Pearlite

The above data is for single casting test, for reference.

Grade and mechanical properties of Ductile iron

Grade

Casting thickness (mm)

Minimum tensile strength (Mpa)

Minimum Bending strength (Mpa)

Minimum Elongation(%)

Brinell hardness HBS

QT400-18A

>30-60

390

250

18

130-180

>60-200

370

240

12

QT400-15A

>30-60

390

250

15

130-180

>60-200

370

240

12

QT500-7A

>30-60

450

300

7

170-240

>60-200

420

290

5

QT600-3A

>30-60

600

360

3

180-270

>60-200

550

340

1

QT700-2A

>30-60

700

400

2

220-320

>60-200

650

380

1

The above data is for casting test in block , for reference.

Grade and mechanical properties of Vermicular graphite cast iron

Grade

Minimum tensile strength (Mpa)-

Minimum Bending strength (Mpa)

Minimum Elongation(%)

Brinell hardness

HBS

Vermiculating Rate(%) minimum

RuT420

420

335

0.75

200-280

RuT380

380

300

0.75

193-274

RuT340

340

270

1

170-249

RuT300

300

240

1.5

140-217

RuT260

260

195

3

121-197