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Meehanite Nodular Graphite Types (Ductliron ®)

Type SP-80 possesses in the as-cast condition more than twice the strength of conventional gray cast iron in combination with exceptional toughness. It has a predominantly pearlitic structure, is readily machinable and responds easily to surface hardening by chill casting or by flame or electric induction heat treatment.

Type SP-100 is characterized by its exceptional hardenability. It is particularly suited where high strengths are desired in relatively heavy casting sections. In the as-cast condition it has a pearlitic structure. Any hardness value may be obtained, ranging from that of a free machinable iron to that of the fully hardened tool steel. SH-100 oil quenched from 1650°F and drawn at 750°F results in a good combination of hardness, strength and toughness.

Type SF-60 possesses high ductility and exceptional resistance to shock. It has maximum toughness and machinability. Its structure is essentially ferritic and not readily flame hardened.

Type AQS is an air hardening metal possessing high strength, toughness and hardness. It may be fully air quenched throughout casting section after machining to a wide range of strength and hardness values that are uniform with little or no risk of cracking or distortion. It has high endurance strength and provides an excellent degree of abrasion resistance.

Meehanite Nodular Graphite Types
PROPERTY TYPE
SP-80		 TYPE
SH-100		 TYPE
SF-60		 TYPE
AQS
Tensile Strength-psi 80/100,000 100/170,000 >60,000 80,000/180,000
Yield Strength-psi 60/75,000 70/130,000 >40,000 70/140,000
Modulus of Elasticity (tension) EX 106 25 24 24 25
Elongation % 3%-10% 1%-5% 15%-25% 1%-3%
Endurance Limit (unnotched) 39,000 43,000 30,000 53,000
Endurance Ratio (unnotched)
(45° notch)		 0.49
0.35		 0.33
0.25		 0.50
0.35		 0.33
Poisson's Ratio 0.37 0.37 0.32  
Brinell Hardness (Nominal) 200 207/600 161 225/500
Specific Gravity 7.20 7.22 7.18  
Solid Contraction
(Patternmaker's Shrinkage)		 5/32" per ft.
1.3%		 5/32" per ft.
1.3%		 1/8" per ft.
1.0%		 5/32"per ft.
1.3%
Specifications Met ASTM-A536
(80-50-06)		 ASTM-A536
(100-70-03)		 ASME SA395
MIL-1-24137
 Ships
ASTM A395
ASTM A536		  
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