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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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