Mechanical and Physical Properties Of Ductile Iron

Property Values	Units	Material Grades
Property Values	Units	QT350-22	QT400-18	QT450-10	QT500-7	QT550-5	QT600-3	QT700-2	QT800-2	QT900-2	QT500-10
Shear Strength	MPa	315	360	405	450	500	540	630	720	810	__
Torsional Strength	MPa	315	360	405	450	500	540	630	720	810	__
Elasticity Modulus E (Tension and Compression)	GPa	169	169	169	169	172	174	176	176	176	170
Poisson's Ratio v	/	0.275	0.275	0.275	0.275	0.275	0.275	0.275	0.275	0.275	0.28~0.029
Non-notched Fatigue Limit^a (rotating bending) (∮10.6mm)	MPa	180	195	210	224	236	248	280	304	304	225
Notched Fatigue Limit^b (rotating bending) (∮10.6mm)	MPa	114	122	128	134	142	149	168	182	182	140
Compressive Strength	MPa	__	700	700	800	840	870	1000	1150	__	__
Fracture Toughness K_IC	MPa·√m	31	30	28	25	22	20	15	14	14	28
Thermal Conductivity at 300°C	W/(K·m)	36.2	36.2	36.2	35.2	34	32.5	31.1	31.1	31.1	__
Specific Heat Capacity at 20°C~500°C	J/(kg·K)	515	515	515	515	515	515	515	515	515	__
Linear Expansion Coefficient at 20°C~400°C	μm(m·K)	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	12.5	__
Density	kg/dm³	7.1	7.1	7.1	7.1	7.1	7.2	7.2	7.2	7.2	7.1
Maximum Permeability	μH/m	2136	2136	2136	1596	1200	866	501	501	501	__
Hysteresis Loss (B=1T)	J/m³	600	600	600	1345	1800	2248	2700	2700	2700	__
Electrical Resistivity	μΩ·m	0.50	0.50	0.50	0.51	0.52	0.53	0.54	0.54	0.54	__
Main Matrix Structure	__	Ferrite	Ferrite	Ferrite	Ferrite-Pearlite	Ferrite-Pearlite	Pearlite-Ferrite	Pearlite	Pearlite or Sorbite	Tempered martensite or Sorbite+Troostite	Ferrite
Note: Unless otherwise stated, the values listed in this table are measured at room temperature.