Properties tables of Irons

I> Main Physical Properties at Room Temperature

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		CAST IRON	DUCTILE IRON	CAST STEEL LOW CARBON	CAST STEEL LOW ALLOY
1	Density (Lb/In³)	0.26	0.26	0.28	0.28
2	Poisson's ratio [ט]	0.28	0.28	0.3	0.3
3	Modulus of elasticity (Tension) (Psi) [E]	13000000	26000000	30000000	30000000
4	Modulus of rigidity (Shear) (Psi) [G]	5800000	9800000	11500000	11500000
5	Thermal conductivity (BTU/Hr/Ft²/In/°F) [k] (Cu=2700	325	250	350	225
6	Coefficient of thermal expansion (/°F) [a]	5.8 X 10^-6	6.5 X 10^-6	6.5 X 10^-6	6.7 X 10^-6
7	Damping capacity	40 to 125	3 to 10	1 to 2	1 to 2
9	Electrical resistivity (µ Ohm . Cm) [ρ] (Cu =1.67)	80 to 100	40 to 60	12	15
10	Magnetic property (KiloGauss/Oersteds@100 Oersteds	10	14	16	16
11	Patternmaking shrinkage (%)	0.83	1.04	1.56	2.08

II> Main Mechanical Properties at Room Temperature

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		CAST IRON	DUCTILE IRON	CAST STEEL LOW CARBON	CAST STEEL LOW ALLOY
1	Tensile strength (Ksi) [U]	25 to 50	60 to 100	70	90
2	Yield strength (Ksi)	--	40 to 60	45	60
3	Elongation (%) [EL]	<1	20	26	23
4	Hardness (BHN)	160 to 210	170 to 220	120 to 160	180 to 220
	IMPACT MODE(Typical values)
5	Charpy test - « V » notch [J] at 20⁰C	1.5-7	12-20	25-50	60-120
6	Resistance to crack propagation (MPa m)	11-19	45-100	50-175	50-175

III> Mechanical Properties Degradation

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		CAST IRON	DUCTILE IRON	CAST STEEL LOW CARBON	CAST STEEL LOW ALLOY
1	Tensile strength degradation at 750°F	<15%	<15%	<15%	<15%
2	Yield strength degradation at 750°F	-	<15%	<15%	<15%
3	% Elongation degradation at 750°F	-	<15%	<15%	<15%
4	Tensile strength degradation at 1100°F	<50%	<50%	>90%	>50%
5	Tensile strength degradation at 1300°F	>75%	>75%	>95%	>80%
6	QI	< 500	38000	55000	50000/85000

IV> Temperature Gradients Concerns

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		CAST IRON	DUCTILE IRON	CAST STEEL LOW CARBON	CAST STEEL LOW ALLOY
1	Basis temperature gradient inducing parameter (Eα/k)	24	67	55	89
2	Pure thermal resistance parameter [U / (Eα/k)]	9	7	9	7
3	Thermal fatigue at approx 1200⁰F	Good	Fair	Fair / Good	Fair / Good
4	Thermal chocs	Bad / Fair	Fair	Good	Good
5	Thermal stress + Mechanical toughness at 1200°F	Bad / Fair	Fair	Good	Good / Very good
6	Stress-Rupture characteristics at high temperature (Ksi)	4	6	9	14/30

V> Dimentional Stability

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		CAST IRON	DUCTILE IRON	CAST STEEL LOW CARBON	CAST STEEL LOW ALLOY
1	Shape stability	Excellent	Fair	Poor	Fair
2	Creep, (%/hre at 800⁰F, 25 Ksi)	Excellent .001-.01	Fair .02-.20	Poor / Fair .05-.5	Good .005-.05
3	Resistance to growth	Bad	Good	Good / Very good	Very good

VI> Oxydation / Scaling

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		CAST IRON	DUCTILE IRON	CAST STEEL LOW CARBON	CAST STEEL LOW ALLOY
1	Resistance to oxydation / Scaling	Fair	Good	good	Good

VII> Castability

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		CAST IRON	DUCTILE IRON	CAST STEEL LOW CARBON	CAST STEEL LOW ALLOY
1	Ease to fill tin and extended cavities	Excellent	Good	Fair	Fair
2	Shrinkage free potential	Excellent	Good	Poor	Poor

VIII> Other Forming Characteristics

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		CAST IRON	DUCTILE IRON	CAST STEEL LOW CARBON	CAST STEEL LOW ALLOY
1	Machinability	Excellent	Good	Fair	Fair
2	Formability	Useless	Poor	Excellent	Fair
3	Hardenability	Very good	Excellent	Poor	Poor / Low
4	Weldability	Poor	Poor	Excellent	Good

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