GB 1348 QT700-2 is pearlitic ductile cast iron with high strength and wear resistance, but has low toughness and plasticity.
QT700-2 ductile cast iron is suitable for high strength parts, such as crankshaft, camshaft of diesel engine and gasoline engine, partial grinder, milling machine, spindle of lathe, gear shaft of ball mill, spindle of small water turbine, etc.
Chemical composition in % for GB 1348 QT700-2 ductile cast iron:
In different material standards, the recommended chemical composition is different, so there is no mandatory stipulation to them. The iron foundries could adjust the chemical components according to their experience and production conditions, as long as they could meet the mechanical properties. The normal chemical composition for this grade is as the following:
C |
Si |
Mn |
P |
S |
Mg |
Re |
Cu |
3.2~3.7 |
2.3~2.6 |
0.5~0.7 |
≤0.07 |
≤0.03 |
0.025~0.06 |
0.02~0.04 |
0.2~0.4 |
Mechanical properties of GB 1348 QT700-2 ductile cast iron:
Mechanical Properties |
GB 1348 QT700-2 |
Tensile Strength σb (MPa) |
≥700 |
Yield Strength σ0.2 (MPa) |
≥420 |
Elongation δ(%) |
≥2 |
Hardness HBS |
225~305 |
Dimensional tolerance of ductile iron castings QT700-2:
Casting
Dimensions (mm) |
＞
25~40 |
＞
40~63 |
＞
63~100 |
＞100~160 |
＞
160~250 |
＞
250~400 |
＞
400~630 |
＞
630~1000 |
＞
1000~1600 |
＞
16~2500 |
Sand Casting |
Majorunit |
±
0.9 |
±
1.0 |
±
1.1 |
±
1.3 |
±
1.4 |
±
1.6 |
±
1.8 |
±
2.0 |
±
2.3 |
±
2.7 |
Minor unit |
±1.8 |
±
2.0 |
±
2.2 |
±
2.5 |
±
2.8 |
±
3.1 |
±
3.5 |
±
4.0 |
±
4.5 |
±
5.0 |
Investment Casting |
CT7 |
±
0.45 |
±
0.50 |
±
0.55 |
±
0.6 |
±
0.7 |
±
0.8 |
±
0.9 |
±
1.0 |
±
1.1 |
±
1.3 |
Heat treatment specification and metallographic structure of GB 1348 QT700-2 ductile cast iron:
Heat treatment specification:(determined by the supplier, the following is the heat treatment specification of a sample for reference) 800℃, normalizing
Metallographic structure: graphite + pearlite + a small amount of ferrite
Worldwide equivalents of grade QT700-2 (China: GB 1348)
EU
EN |
USA
- |
Germany
DIN,WNr |
Japan
JIS |
France
AFNOR |
England
BS |
European old
EN |
Italy
UNI |
Belgium
NBN |
EN-GJS-700-2 (5.3300) |
100-70-03 |
0.7070
GGG70 |
FCD700
FCD700-2 |
700-2
FGS700-2 |
700/2 |
EN-JS1070 |
GS700-2 |
FNG70-2 |
Spain
UNE |
China
GB |
Sweden
SS |
Bulgaria
BDS |
Hungary
MSZ |
Poland
PN |
Romania
STAS |
Czechia
CSN |
Finland
SFS |
FGE70-2 |
QT700-2 |
0737-01
37-01 |
700-2 |
GoV70 |
Zs70002
ZS7002 |
FGN70-3 |
422307 |
GRP700 |
Austria
ONORM |
Australia
AS |
Norway
NS |
Russia
GOST |
Inter
ISO |
India
IS |
Netherlands
NEN |
Luxembourg |
COPANT |
GGG700
SG70 |
700-2 |
SJK-700 |
VCH70 |
700-2
700-2/S
700-2/U |
SG700/2 |
GN70 |
FNG70-2 |
FMNP70002 |
|
