Crucible Steel HALGRAPH® Tool Steel, AISI O6

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Crucible Steel HALGRAPH® Tool Steel, AISI O6
Categories:	Metal; Ferrous Metal; Tool Steel; Oil-Hardening Steel
Material Notes:	Halgraph is an oil-hardening graphitic tool steel with excellent non-deforming properties. Free graphite in its structure affords exceptional free-machining properties. The combination of graphite and hard carbides give Halgraph tools excellent resistance to adhesive wear (galling) in applications such as ring gauges, plug gauges, and bushings. Information provided by Crucible Industries
Key Words:	AISI O6
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Physical Properties	Original Value	Comments

Density	0.278 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Brinell	187 - 221
Hardness, Rockwell C	64 - 66	hardened at 1475°F then quenched
	45 - 47 @Tempering Temp. 482 °C	hardened at 1475F then tempered
	49 - 51 @Tempering Temp. 427 °C	hardened at 1475F then tempered
	53 - 55 @Tempering Temp. 371 °C	hardened at 1475F then tempered
	55 - 57 @Tempering Temp. 343 °C	hardened at 1475F then tempered
	57 - 59 @Tempering Temp. 288 °C	hardened at 1475F then tempered
	57 - 59 @Tempering Temp. 316 °C	hardened at 1475F then tempered
	58 - 60 @Tempering Temp. 260 °C	hardened at 1475F then tempered
	59 - 61 @Tempering Temp. 232 °C	hardened at 1475F then tempered
	60 - 62 @Tempering Temp. 204 °C	hardened at 1475F then tempered
	61 - 63 @Tempering Temp. 177 °C	hardened at 1475F then tempered
	62 - 64 @Tempering Temp. 149 °C	hardened at 1475F then tempered
Modulus of Elasticity	30000 ksi
Charpy Impact	20.0 ft-lb @Tempering Temp. 149 °C	hardened at 1475°F then tempered; C-notch
	20.0 ft-lb @Tempering Temp. 260 °C	hardened at 1475°F then tempered; C-notch
	27.0 ft-lb @Tempering Temp. 204 °C	hardened at 1475°F then tempered; C-notch
	27.0 ft-lb @Tempering Temp. 316 °C	hardened at 1475°F then tempered; C-notch
	35.0 ft-lb @Tempering Temp. 371 °C	hardened at 1475°F then tempered; C-notch
	42.0 ft-lb @Tempering Temp. 427 °C	hardened at 1475°F then tempered; C-notch
	53.0 ft-lb @Tempering Temp. 482 °C	hardened at 1475°F then tempered; C-notch

Thermal Properties	Original Value	Comments
CTE, linear	6.20 µin/in-°F @Temperature 21.1 - 204 °C
	6.70 µin/in-°F @Temperature 21.1 - 316 °C
	7.10 µin/in-°F @Temperature 21.1 - 427 °C
Thermal Conductivity	34.5 W/m-K @Temperature 95.0 °C

Processing Properties	Original Value	Comments
Processing Temperature	1385 °F	Critical Thermal Treatment Temperature

Component Elements Properties	Original Value	Comments
Carbon, C	1.5 %
Iron, Fe	96.45 %	as balance
Manganese, Mn	0.75 %
Molybdenum, Mo	0.30 %
Silicon, Si	1.0 %

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NCRUC914 / 160365

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