Meehanite Flake Graphite Types

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. Recommended for dies, punches, spinning mandrels and other hard wearing applications.

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. Recommended for heavy brake drums and pressure castings up to 2 1/2" thick.

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.

Meehanite Flake Graphite Types
PROPERTY	TYPE AQ	TYPE GM-60	TYPE GA-50	TYPE GC-40	TYPE GE-30	TYPE GF-20
Tensile Strength-psi	50/65,000	60,000	50,000	40,000	30,000	20,000
Proportional Limit-psi .01% permanent set	25,000	25,000	22,000	14,500	11,500	9,500
Modulus of Elasticity-psi	22,000,000	21,500,000	20,000,000	16,500,000	13,000,000	9,000,000
Modulus of Rigidity-psi	9,500,000	9,500,000	8,750,000	7,250,000	5,550,000	4,000,000
Poisson's Ratio	0.33	0.33	0.32	0.30	0.27	0.24
Modulus of Rupture-psi	93,000	93,000	90,000	80,000	61,000	41,000
Compression Strength-psi	200,000	200,000	180,000	150,000	120,000	90,000
Fatigue Strength-psi	30,000	25,000	22,000	17,500	13,500	11,000
Shear Strength-psi		53,000	50,000	40,000	30,000	21,550
Single Impact-Izod                      (0.798") Dia. Unnotched Bar	30-40	30-40	25-35	12-20	6-12	4-9
Brinell Hardness (Nominal)	280-550	230	220	190	up to 160	150
Machinability Rating (Dalcher)	52	50	48	47	38	30
Thermal Conductivity 50-450 &degF. BTU/Hr/Sq. Ft./Inch Thickness/&&degF		355	350	325	290	---
Coefficient of Thermal Expansion Per &degF. from 100 deg to 1000 &degF.	.00000675	.00000705	.00000620	.00000660	.00000690	---
Specific Gravity	7.34	7.34	7.31	7.25	7.06	6.80
Solid Contraction (Patternmaker's Shrinkage)	5/32"-6/32" per ft. (1.3-1.5%)	5/32"-6/32" per ft. (1.3-1.5%)	5/32"-6/32" per ft. (1.3-1.5%)	4/32"-5/32" per ft. (1.0-1.3%)	1/10"-1/8" per ft. (0.8-1.0%)	1/10" (0.8%)