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  GB 1348 QT500-7 Ductile Cast Iron  
 

GB 1348 QT500-7 ductile iron is a ferritic type ductile iron with medium strength and toughness and good machinability.

Characteristics and application range of ductile iron QT500-7:
At low temperature, the toughness changes to brittleness, but the impact value at low temperature is higher, and it has some resistance to temperature change and corrosion resistance.

Ductile iron QT500-7 is widely used in the manufacturing of internal combustion engine's oil pump gears, steam turbine cylinder baffles, water turbine value bodies, railway locomotives and rolling stocks, machine seats frame drive shafts, etc.

Chemical composition in % for GB 1348 QT500-7 ductile cast iron

C

Si

Mn

S

P

3.60~3.80

2.50~2.90

≤0.60

≤0.025

≤0.08

As for normal ductile iron, the chemical composition is not important comparatively. The iron foundries could adjust the compositions according to their experience as long as they could meet the physical and mechanical requirements.

Mechanical Properties of GB 1348 QT500-7 ductile cast iron:

Mechanical Properties

GB 1348 QT500-7

Tensile Strength σb (MPa)

≥500

Yield Strength σ0.2 (MPa)

≥320

Elongation δ(%)

≥7

Hardness HBS

170~230

Heat treatment specification and metallographic structure of GB 1348 QT500-7 ductile cast iron:
Heat treatment specification: (specified by the supplier, the following is the heat treatment specification of a sample for reference) 920℃, annealing
Metallographic structure: ferrite + pearlite

Worldwide equivalents of grade QT500-7 (China: GB 1348)

EU
EN

USA
-

Germany
DIN,WNr

Japan
JIS

France
AFNOR

England
BS

European old
EN

Italy
UNI

Belgium
NBN

EN-GJS-500-7 (5.3200)

65-45-12
70-50-05
80-55-06

0.7050
GGG50

FCD500
FCD500-7

500-7
FGS500-7

500/7

EN-JS1050

GS500-7

FNG50-7


Spain
UNE

China
GB

Sweden
SS

Bulgaria
BDS

Hungary
MSZ

Poland
PN

Czechia
CSN

Finland
SFS

Austria
ONORM

FGE50-7

QT500-7

0727-02
27-02

450-5
500-2

GoV50

ZS4505
ZS50007
ZS5002

422305

GRP500

GGG500
SG50


Australia
AS

Norway
NS

Russia
GOST

Inter
ISO

India
IS

Netherlands
NEN

Denmark
DS

Luxembourg
-

COPANT
-

500-7

SJK-500

VCH50

500-7
500-7/S
500-7/U

SG500/7

GN50

0707

FNG50-7

FMNP55005

 

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