Newly Arrival Hardness Test Standard - The Impact Device of Hardness Tester – TMTeck

Material

Hardness method

Impact device

D/DC

D+15

C

G

E

DL

Steel and cast steel

HRC

17.9～68.5

19.3～67.9

20.0～69.5

22.4～70.7

20.6～68.2

HRB

59.6～99.6

47.7～99.9

37.0～99.9

HRA

59.1~85.8

61.7～88.0

HB

127～651

80～638

80～683

90～646

83～663

81～646

HV

83～976

80～937

80～996

84～1042

80～950

HS

32.2～99.5

33.3～99.3

31.8～102.1

35.8～102.6

30.6～96.8

Hammered steel

HB

143~650

Cold work tool steel

HRC

20.4～67.1

19.8～68.2

20.7～68.2

22.6～70.2

HV

80～898

80～935

100～941

82～1009

Stainless steel

HRB

46.5～101.7

HB

85～655

HV

85～802

Gray cast iron

HRC

HB

93～334

92～326

HV

Nodular cast  iron

HRC

HB

131～387

127～364

HV

Cast aluminum

alloys

HB

19～164

23～210

32～168

HRB

23.8～84.6

22.7～85.0

23.8～85.5

Brass(copper-zinc alloys)

HB

40～173

HRB

13.5～95.3

Bronze (copper-aluminum/copper-tin alloys)

HB

60～290

Wrought copper

alloys

HB

45～315

Non conventional

 impact devices

D+15

C

G

E

Impacting energy

Mass of impact

body

11Mj

5.5g/7.2g

11mJ

7.8g

2.7mJ

3.0g

90mJ

20.0g

11mJ

5.5g

1600HV

3mm

Tungsten carbide

1600HV

3mm

Tungsten carbide

1600HV

3mm

Tungsten carbide

1600HV

5mm

Tungsten carbide

5000HV

3mm

synthetic

diamond

Impact device Diameter

Impact device

Length

Impact device

Weight

20mm

86(147)/ 75mm

50g

20mm

162mm

80g

20mm

141mm

75g

30mm

254mm

250g

20mm

155mm

80g

Max. hardness of workpiece

940HV

940HV

1000HV

650HB

1200HV

Mean roughness of workpiece surface of the Ra

1.6μm

1.6μm

0.4μm

6.3μm

1.6μm

Min. weight of sample

Measure directly Need support firmly

Need coupling tightly

>5kg

2～5kg

0.05～2kg

>5kg

2～5kg

0.05～2kg

>1.5kg

0.5～1.5kg

0.02～0.5kg

>15kg

5～15kg

0.5～5kg

>5kg

2～5kg

0.05～2kg

Min. thickness of sample coupling tightly

Min.layer thickness for surface harden

5mm

≥0.8mm

5mm

≥0.8mm

1mm

≥0.2mm

10mm

≥1.2mm

5mm

≥0.8mm

Size of tip indentation

  Hardness  300HV

Indentation

 diameter

0.54mm

0.54mm

0.38mm

1.03mm

0.54mm

Indentation

depth

24μm

24μm

12μm

53μm

24μm

  Hardness  600HV

Indentation

 diameter

0.54mm

0.54mm

0.32mm

0.90mm

0.54mm

 Indentation

depth

17μm

17μm

8μm

41μm

17μm

  Hardness  800HV

 Indentation

diameter

0.35mm

0.35mm

0.35mm

–

0.35mm

 Indentation

depth

10μm

10μm

7μm

–

10μm

Available type of impact device

D:

General test

DC:

Hole or hollow-cylindrical test

DL:

Slender narrow groove or hole test

D+15:

groove or reentrant surface

C:

small, light, thin parts or surface of hardend layer

G:

large, thick, heavy or rough surface steel

E:

super high hardness material

Type of Impact Device

Distance of center of the two indentations

Distance of center of the indentation to sample edge

Not less than (mm)

Not less than (mm)

D、DC

3

5

DL

3

5

D+15

3

5

G

4

8

E

3

5

C

2

4