GB T1348 for Ductile Iron - Dandong Foundry

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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 σ_b≥/MPa	Yield strength σ_0.2≥/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℃) α_K≥/(J/cm²)		Impact toughness at low temperature (-20±2℃) α_K≥/(J/cm²)
Grade	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 σ_b≥/MPa	Yield strength σ_0.2≥/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℃) α_K≥/(J/cm²)		Impact toughness at low temperature (-20±2℃) α_K≥/(J/cm²)
Grade	Thickness /mm	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)
Hardness grade	Hardness HBS	Main microstructure	Tensile strength σ_b≥/MPa	Yield strength σ_0.2≥/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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