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  GB 1348 QT700-2 Ductile Cast Iron  
 

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

 

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