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Crucible Steel HALGRAPH® Tool Steel, AISI O6

Category Metal , Ferrous Metal , Tool Steel , Oil-Hardening Steel
Manufacturer Crucible Steel
Trade Name HALGRAPH®
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Crucible Steel HALGRAPH® Tool Steel, AISI O6.pdf
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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
Physical Properties Metric English Comments
Density 7.70 g/cc
0.278 lb/in³
Mechanical Properties Metric English Comments
Hardness, Brinell 187 - 221
187 - 221
Hardness, Rockwell C 64 - 66
64 - 66
hardened at 1475°F then quenched
45 - 47

@Tempering Temp. 482 °C
 45 - 47

@Tempering Temp. 900 °F
 hardened at 1475F then tempered
49 - 51

@Tempering Temp. 427 °C
 49 - 51

@Tempering Temp. 800 °F
 hardened at 1475F then tempered
53 - 55

@Tempering Temp. 371 °C
 53 - 55

@Tempering Temp. 700 °F
 hardened at 1475F then tempered
55 - 57

@Tempering Temp. 343 °C
 55 - 57

@Tempering Temp. 650 °F
 hardened at 1475F then tempered
57 - 59

@Tempering Temp. 288 °C
 57 - 59

@Tempering Temp. 550 °F
 hardened at 1475F then tempered
57 - 59

@Tempering Temp. 316 °C
 57 - 59

@Tempering Temp. 600 °F
 hardened at 1475F then tempered
58 - 60

@Tempering Temp. 260 °C
 58 - 60

@Tempering Temp. 500 °F
 hardened at 1475F then tempered
59 - 61

@Tempering Temp. 232 °C
 59 - 61

@Tempering Temp. 450 °F
 hardened at 1475F then tempered
60 - 62

@Tempering Temp. 204 °C
 60 - 62

@Tempering Temp. 400 °F
 hardened at 1475F then tempered
61 - 63

@Tempering Temp. 177 °C
 61 - 63

@Tempering Temp. 350 °F
 hardened at 1475F then tempered
62 - 64

@Tempering Temp. 149 °C
 62 - 64

@Tempering Temp. 300 °F
 hardened at 1475F then tempered
Modulus of Elasticity 207 GPa
30000 ksi
Charpy Impact 27.1 J

@Tempering Temp. 149 °C
 20.0 ft-lb

@Tempering Temp. 300 °F
 hardened at 1475°F then tempered; C-notch
27.1 J

@Tempering Temp. 260 °C
 20.0 ft-lb

@Tempering Temp. 500 °F
 hardened at 1475°F then tempered; C-notch
36.6 J

@Tempering Temp. 204 °C
 27.0 ft-lb

@Tempering Temp. 400 °F
 hardened at 1475°F then tempered; C-notch
36.6 J

@Tempering Temp. 316 °C
 27.0 ft-lb

@Tempering Temp. 600 °F
 hardened at 1475°F then tempered; C-notch
47.5 J

@Tempering Temp. 371 °C
 35.0 ft-lb

@Tempering Temp. 700 °F
 hardened at 1475°F then tempered; C-notch
56.9 J

@Tempering Temp. 427 °C
 42.0 ft-lb

@Tempering Temp. 800 °F
 hardened at 1475°F then tempered; C-notch
71.9 J

@Tempering Temp. 482 °C
 53.0 ft-lb

@Tempering Temp. 900 °F
 hardened at 1475°F then tempered; C-notch
Thermal Properties Metric English Comments
CTE, linear 11.2 µm/m-°C

@Temperature 21.1 - 204 °C
 6.20 µin/in-°F

@Temperature 70.0 - 400 °F
12.1 µm/m-°C

@Temperature 21.1 - 316 °C
 6.70 µin/in-°F

@Temperature 70.0 - 600 °F
12.8 µm/m-°C

@Temperature 21.1 - 427 °C
 7.10 µin/in-°F

@Temperature 70.0 - 800 °F
Thermal Conductivity 34.5 W/m-K

@Temperature 95.0 °C
 239 BTU-in/hr-ft²-°F

@Temperature 203 °F
Component Elements Properties Metric English Comments
Carbon, C 1.5 %
1.5 %
Iron, Fe 96.45 %
96.45 %
as balance
Manganese, Mn 0.75 %
0.75 %
Molybdenum, Mo 0.30 %
0.30 %
Silicon, Si 1.0 %
1.0 %
Chemical Properties Metric English Comments
Critical Temperature 751.7 °C
1385 °F
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