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  GB 1348 QT400-18 Ductile Cast Iron  
 

GB 1348 QT400-18 is ferrite type ductile iron, it has good welding and cutting performance.

Ductile iron QT400-18 mainly used for the parts which can withstand high impact vibration and torsion, such as power machinery crankshaft, camshaft, connecting shaft, connecting rod, gear, clutch plate, hydraulic cylinder and other parts.

According to the standard GB T 1348 1998, the cast iron foundries could adjust the chemical composition by themselves as long as the mechanical and physical properties of the castings could meet the requirements in Standards.

However, there is an approximate chemical composition range as the following. This range is just for reference, and can not be taken as the inspection yard.

Chemical composition in % for GB 1348 QT400-18 ductile cast iron

C

Si

Mn

S

P

Mg

Re

3.45~3.64

2.47~3.00

0.45~0.57

0.012~0.026

0.047~0.060

0.029~0.062

0.032~0.047

Physical and Mechanical Properties of GB 1348 QT400-18 ductile cast iron:

Physical and Mechanical Properties

GB 1348 QT400-18

Tensile Strength, min, psi

60,000

Tensile Strength, min, MPa

414

Yield Strength, min, psi

40,000

Yield Strength, min, MPa

276

Elongation in 2 in. or 50 mm, min %

18

Hardness HBS

130~180

Density lb/in3

0.256

Density g/cm3

7.1

Melting Temperature (Degrees F)

2,100 – 2,190

Melting Temperature (Degrees C)

1,150 - 1,200

Compressive Strength Ksi

429

Compressive Strength MPa

2960

UNS

F32800

Impact performance of V-notch test specimens of single block

Grades

Room temperature impact toughness (23±5℃)αK≥/(J/cm2)

Low temperature impact toughness (-20±2℃)αK≥/(J/cm2)

The average of three samples

Few values

The average of three samples

Few values

QT400-18

14

11

QT400-18L

12

9

Note: The letter "L" indicates the impact value of this grade at low temperature.

Impact strength of V-notch test blocks of ductile iron attached

Grade

Casting wall thickness/mm

Room temperature impact toughness (23±5℃)αK≥/(J/cm2)

Low temperature impact toughness (-20±2℃)αK≥/(J/cm2)

The average of three samples

Few values

The average of three samples

Few values

QT400-18A

>30~60>60~200

1412

119

QT400-18AL

>30~60>60~120

1210

97

Related grades for GB 1348 QT400-18 ductile cast iron:

Material Grade

Standard

Country Code

Yield stress (Mpa)

Tensile stress (Mpa)

Elongation (%)

Thick (mm)

FCD 40

2869

CNS

≧280

≧400

≧12

 

QT400-18

1348

GB

≧250

≧400

≧18

 

FCD400-18

G5502

JIS

≧205

≧400

≧12

 

60-40-18

A536

ASTM

≧276

≧414

≧18

≦50

GGG-40

1693

DIN

≧250

≧400

≧15

≦50

 

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