Meehanite® Flake Graphite

Type AQ is a wear and abrasion resisting iron that is readily machinable as-cast but may be “air hardened” after machining with minimum risk of cracking or distortion. Type AQ is easily heat treated and locally hardened.

Type GM-60 possesses exceptionally high physical properties, including good impact strength and shock resistance – responds well to heat treatment and surface hardening. Type GM machines to a very fine finish and is recommended for heavy section castings where pressure tightness is required.

Type GA-50 combines high strength, toughness, wear resistance and damping capacity with excellent machinability. Responds well to heat treatment, local and surface hardening.

Type GC-40 combines good strength with low coefficient of friction and self lubricating properties. It is easily machinable with a fine, dense, close grain structure.

Type GE-30  combines improved strength and solidity with higher machining feeds and speeds than ordinary gray iron.

Type GF-20 is designed principally for high machinability and is used where ultimate strength is not an important factor.

PROPERTYTYPE
AQ
TYPE
GM-60
TYPE
GA-50
TYPE
GC-40
TYPE
GE-30
TYPE
GF-20
Tensile Strength-psi50/65,00060,00050,00040,00030,00020,000
Proportional Limit-psi
.01% permanent set
25,00025,00022,00014,50011,5009,500
Modulus of Elasticity-psi22,000,00021,500,00020,000,00016,500,00013,000,0009,000,000
Modulus of Rigidity-psi9,500,0009,500,0008,750,0007,250,0005,550,0004,000,000
Poisson's Ratio0.330.330.320.300.270.24
Modulus of Rupture-psi93,00093,00090,00080,00061,00041,000
Compression Strength-psi200,000200,000180,000150,000120,00090,000
Fatigue Strength-psi30,00025,00022,00017,50013,50011,000
Shear Strength-psi53,00050,00040,00030,00021,550
Single Impact-Izod
(0.798") Diameter
Unnotched Bar

30-40

30-40

25-35

12-20

6-12

4-9
Brinell Hardness (Nominal)280-550230220190up to 160150
Machinability Rating (Dalcher)525048473830
Thermal Conductivity
50-450°F. BTU/Hr/
Sq. Ft./In. Thickness/°F

355

350

325

290
---
Coefficient of Thermal Expansion
Per °F. from 100° to 750°F.

.00000675

0.00000640

0.00000650

0.00000670

0.00000680

0.00000700
Specific Gravity7.347.347.317.257.066.80
Solid Contraction
(Patternmaker's Shrinkage)
5/32"-6/32" /ft.
(1.3-1.5%)
5/32"-6/32" /ft.
(1.3-1.5%)
5/32"-6/32" /ft.
(1.3-1.5%)
4/32"-5/32" /ft.
(1.0-1.3%)
1/10"-1/8" /ft.
(0.8-1.0%)
1/10" /ft.
(0.8%)