Density

g/cm³

7.80

3.20~3.30

6.05

3.90~3.95

3.10~3.15

3.26

2.2

Hardness

HV(MPa)

700

1500~1800

1200

1600~1800

2000~2400

1200

2800

HRC

62

75~80

70

80

85~90

-

-

Modulus of Elasticity

(Young’s Modulus)

GPa

208

300~320

210

340

360

310

-

Thermal Expansion Coefficient

10^-6K

12.50

3.20

10.50

8.50

3.8

4.5

1.5~6.5

Thermal Conductivity(20℃)

W/M·K

40

25

2

25

120

120~220

20~46

Max Usage Temperature

℃

120

900

500

1750

1350

1300(2450Res.)

1300(2400Res.)

Poisson’s Ratio

0.30

0.26

0.30

0.22

0.15

-

-

Flexural Strength(Room Temp.)

MPa

520

720

950

310

410

650

-

Flexural Strength(800℃)

MPa

-

450

210

230

380

390~490

-

Compressive Strength(Room Temp.)

MPa

-

2300

2000

2200

1800

250

-

Crushing Strength(800℃)

MPa

-

1400

2100

1500

1500

2100 (20℃)

-

Electrical Resistivity(Room Temp.)

Ω·mm²/m

0.1~1

>10¹³

>10¹⁵

>10¹⁶

>10³

>10¹³

^-

Fracture Toughness(K_IC)

MPa·m^1/2

25

6.2

10

4.6

3.5

-

-

Corrosion-resistant

-

Poor

Excellent

Excellent

Excellent

Excellent

Excellent

-

Centrifugal Force

Large

Low

Common

Common

Low

Common

-

Non lubrication Friction(Bearing)

-

Large

Low

Low

-

Low

-

-

Self-Lubricating(Bearing)

-

-

Good

Normal

Normal

Normal

Normal

-

Magnetism(Bearing)

-

Normal

None

None

None

None

None

-

Fatigue Type

-

Scale Off

Spalling

Smash

Smash

Smash

Smash

-