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  GB 1348 QT450-10 Ductile Cast Iron  
 

QT450-10 ductile iron is carbon in the form of spherical graphite. Its mechanical properties are much better than gray iron but close to steel.

It has excellent casting, cutting and wear resistance, and has certain elasticity.

Application of GB 1348 QT450-10 ductile cast iron:
QT450-10 ductile cast iron is widely used in the manufacture of crankshaft, gear, piston and other high-grade castings and many kinds of mechanical parts.

Chemical composition in % for GB 1348 QT450-10 ductile cast iron

C

Si

Mn

S

P

3.40~3.90

2.70~3.00

0.20~0.50

≤0.03

≤0.07

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 QT450-10 ductile cast iron:

Mechanical Properties

GB 1348 QT450-10

Tensile Strength σb (MPa)

≥450

Yield Strength σ0.2 (MPa)

≥310

Elongation δ(%)

≥10

Hardness HBS

160~210

The microstructure of GB 1348 QT450-10 ductile cast iron:
Heat treatment specification: as-cast or normalizing
Metallographic structure: as cast: graphite + ferrite (matrix) + pearlite
Normalizing: graphite + more pearlite + ferrite, can obtain higher comprehensive mechanical properties, especially improve plasticity and toughness.

Worldwide equivalents of grade QT450-10 (China: GB 1348)

EU
EN

USA
-

Japan
JIS

France
AFNOR

England
BS

European old
EN

Italy
UNI

Belgium
NBN

Spain
UNE

Bulgaria
BDS

EN-GJS-450-10 (5.3107)

60-42-10
65-45-12

FCD450
FCD450-10

450-10
FGS450-10

420/12
450/10

EN-JS1040

GS400-12

FNG42-12

FGE42-12

400-12


Hungary
MSZ

Poland
PN

Austria
ONORM

Australia
AS

Russia
GOST

Inter
ISO

India
IS

Netherlands
NEN

Luxembourg

COPANT

GoV40

ZS4012

SG42

400-12

VCH45

450-10
450-10/S
450-10/U

SG400/12

GN42

FNG42-12

FMNP45007

 

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