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  Cast Iron Brinell Hardness, Ductile Iron and Gray Cast Iron  
 

Brinell hardness is a typical hardness specification for cast iron products, especially for ductile iron and gray cast iron.

However, in the most international standards, cast iron hardness is not a necessary inspection specification. Only in Chinese standards, we could see the normal Brinell Hardness (HBS) range for common cast iron grades.

If the hardness is very important for your products, for example, you need the better abrasive resistance, then you should add one hardness requirement for your products, so the casting manufacturers could adjust the chemical composition to increase its hardness.

The following list is for the typical Brinell Hardness range for the main grades of ductile iron and grey cast iron.

Resonable Brinell Hardness Range of Ductile iron castings:

ISO 1083
Grade

ASTM A536
Grade

China GB1348
Grade

Tensile strength
 σb/MPa (min)

Yield strength
σ0.2/MPa  (min)

Elongation
δ5 (%)

Hardness
HBS

400-18

60-40-18

QT400-18 QT400-18-LT

400

250

18

130~180

400-15

60-42-10

QT400-15

400

250

15

130~180

450-10

60-45-12

QT450-10

450

310

10

160~210

500-7

70-50-05

QT500-7

500

320

7

170~230

600-3

80-55-06
80-60-03

QT600-3

600

370

3

190~270

700-2

100-70-03

QT700-2

700

420

2

225~305

800-2

120-90-02

QT800-2

800

480

2

245~335

900-2

-

QT900-2

900

600

2

280~360


Resonable Brinell Hardness Range of Gray Iron castings:

ISO 185
Grade

ASTM A48
Grade

China GB9439
Grade

Tensile strength
 σb/MPa (min)

Hardness
HBS

100

-

HT100

100

<170

150

No.20
No.25

HT150

150

125~205

200

No.30

HT200

200

150~230

250

No.35

HT250

250

180~250

300

No.40
No.45

HT300

300

200~275

350

No.50

HT350

350

220~290

 

 

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