Crucible Steel CRUCIBLE A9 Tool Steel

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Crucible Steel CRUCIBLE A9 Tool Steel
Categories:	Metal; Ferrous Metal; Tool Steel; Air-Hardening Steel
Material Notes:	Crucible A9 is an air-hardening tool steel combining some of characteristics of the 5% chromium hot-work grades (such as H13) with the high attainable hardness and compressive yield strength of the cold-work grades such as A2). Crucible A9 is suitable for hot and cold work applications requiring high toughness, hardness, or heat check resistance, and moderate wear resistance. Information provided by Crucible Industries
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Physical Properties	Original Value	Comments

Density	0.281 lb/in³

Mechanical Properties	Original Value	Comments
Hardness, Brinell	217 - 241
Hardness, Rockwell C	47 @Tempering Temp. 593 °C	hardened at 1800°F then tempered
	52.5 @Tempering Temp. 566 °C	hardened at 1800°F then tempered
	54.5 @Tempering Temp. 538 °C	hardened at 1800°F then tempered
	56 @Tempering Temp. 482 °C	hardened at 1800°F then tempered
	56.5 @Tempering Temp. 510 °C	hardened at 1800°F then tempered
Modulus of Elasticity	30000 ksi
Charpy Impact	50.0 ft-lb @Tempering Temp. 482 °C	hardened at 1800°F then tempered; C-notch
	50.0 ft-lb @Tempering Temp. 510 °C	hardened at 1800°F then tempered; C-notch
	112 ft-lb @Tempering Temp. 538 °C	hardened at 1800°F then tempered; C-notch
	134 ft-lb @Tempering Temp. 566 °C	hardened at 1800°F then tempered; C-notch
	151 ft-lb @Tempering Temp. 593 °C	hardened at 1800°F then tempered; C-notch

Thermal Properties	Original Value	Comments
CTE, linear	6.70 µin/in-°F @Temperature 20.0 - 427 °C
	6.90 µin/in-°F @Temperature 20.0 - 538 °C
	7.00 µin/in-°F @Temperature 20.0 - 649 °C
Thermal Conductivity	25.8 W/m-K @Temperature 95.0 °C

Processing Properties	Original Value	Comments
Processing Temperature	1480 °F	Critical Thermal Treatment Temperature

Component Elements Properties	Original Value	Comments
Carbon, C	0.50 %
Chromium, Cr	5.2 %
Iron, Fe	89.2 %	as balance
Manganese, Mn	0.30 %
Molybdenum, Mo	1.4 %
Nickel, Ni	1.4 %
Silicon, Si	1.0 %
Vanadium, V	1.0 %

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NCRUC911 / 160362

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