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GB T 1348 1998 Standard for Ductile Cast Iron

This standard is for stipulating the physical properties of ductile cast iron. In China, the engineers in iron foundries are using it as the inspection standard. This standard was developed from the ISO 1083 and ASTM A536. The following is the main content of GB/T1348-1998 for your reference.

Mechanical properties and microstructure of Cast integral test bar of ductile cast iron

Grade
Tensile strength
σb≥/MPa
Yield strength
σ0.2≥/MPa
Elongation
δ5≥(%)
Hardness
HBS
Main microstructure
QT400-18
400
250
18
130~180
ferrite
QT400-15
400
250
15
130~180
ferrite
QT450-10
450
310
10
160~210
ferrite
QT500-7
500
320
7
170~230
ferrite+perlite
QT600-3
600
370
3
190~270
perlite+ferrite
QT700-2
700
420
2
225~305
perlite
QT800-2
800
480
2
245~335
perlite or tempered structure
QT900-2
900
600
2
280~360
Bainite or tempered martensite
  
Impact toughness of specimen with V gap of Cast integral test bar of ductile cast iron
Grade
Impact toughness at room temperature(23±5℃)
αK≥/(J/cm2)
Impact toughness at low temperature (-20±2℃)
αK≥/(J/cm2)
Average value of three specimen
Individual value
Average value of three specimen
Individual value
QT400-18
14
11
-
-
QT400-18L
-
-
12
9
  
Mechanical properties and microstructure of Attached test bar of ductile cast iron
Grade
Thickness
/mm
Tensile strength
σb≥/MPa
Yield strength
σ0.2≥/MPa
Elongation
δ5≥(%)
Hardness
HBS
Main microstructure
QT400-18A
>30~60
>60~200
390
370
250
240
18
12
130~180
ferrite
QT400-15A
>30~60
>60~200
390
370
250
240
15
12
130~180
ferrite
QT500-7A
>30~60
>60~200
450
420
300
290
7
5
170~240
ferrite+perlite
QT600-3A
>30~60
>60~200
600
550
360
340
3
1
180~270
perlite+ferrite
QT700-2A
>30~60
>60~200
700
650
400
380
2
1
220~320
perlite
 
Impact toughness of specimen with V gap of attached test bar of ductile cast iron
Grade
Thickness
/mm
Impact toughness at room temperature (23±5℃)
αK≥/(J/cm2)
Impact toughness at low temperature (-20±2℃)
αK≥/(J/cm2)
Average value of three specimen
Individual value
Average value of three specimen
Individual value
QT400-18A
>30~60
>60~200
14
12
11
9
-
-
-
-
QT400-18AL
>30~60
>60~120
-
-
-
-
12
10
9
7
 
Grade and hardness range and microstructure of ductile cast iron
Hardness grade
Hardness
HBS
Main microstructure
Mechanical properties (parameter)
Tensile strength
σb≥/MPa
Yield strength
σ0.2≥/MPa
Elongation
δ5≥(%)
QT-H330
280~360
Bainite or tempered martensite
900
600
2
QT-H300
245~335
Perlite or tempered structure
800
480
2
QT-H265
225~305
perlite
700
420
2
QT-H230
190~270
perlite+ferrite
600
370
3
QT-H200
170~230
ferrite+perlite
500
320
7
QT-H185
160~210
ferrite
450
310
10
QT-H155
130~180
ferrite
400
250
15
QT-H150
130~180
ferrite
400
250
15

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