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Chinese Material Grades of Gray Iron and Ductile Cast Iron

The Chinese cast iron material grades were named by "HT" for gray cast iron, and "QT" as the ductile cast iron. The followings are their detailed grades, and related physical properties.

As for the comparison table for Chinese material grades with the equal / equivalent grades in other countries, such as USA, UK, ISO, Japan, Italy, Spain, Austria and Germany etc., please refer to the article "Cast Iron Grades" made by Dandong Foundry.

Gray Cast Iron Grades in China 

Grade

Tensile Strength
Mpa

Hardness grade

Hardness
HBS

Relevant microstructure

HT100

≥ 100

H145

≤170

ferrite

HT150

≥ 150

H175

150~200

ferrite + pearlite

HT200

≥ 200

H195

170~220

pearlite

HT250

≥ 250

H215

190~240

pearlite

HT300

≥ 300

H235

210~260

pearlite (inoculated cast iron)

HT350

≥ 350

H255

230~280

pearlite (inoculated cast iron)

Ductile Cast Iron Grades in China

Grade

Tensile strength
σb≥/MPa

Yield strength
σ0.2≥/MPa

Elongation
δ5≥(
)

Hardness
HBS

Main microstructure

QT400-18

400

250

18

130~180

ferrite

QT400-15

400

250

15

130~180

ferrite

QT450-10

450

310

10

160~210

ferrite

QT500-7

500

320

7

170~230

ferrite + perlite

QT600-3

600

370

3

190~270

perlite + ferrite

QT700-2

700

420

2

225~305

perlite

QT800-2

800

480

2

245~335

perlite or tempered structure

QT900-2

900

600

2

280~360

Bainite or tempered martensite

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