Material

Method

Impact device

D/DC

D+15

C

G

E

DL

Steel and cast steel

HRC

20~68.5

19.3~67.9

20.0~69.5

22.4~70.7

20.6~68.2

HRB

38.4~99.6

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

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

Grey cast iron

HRC

HB

93~334

92~326

HV

Nodular cast iron

HRC

HB

131~387

127~364

HV

Cast aluminium 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-aluminium/tin alloys)

HB

60~290

Wrought copper alloys

HB

45~315

Available type of impact device

DC: Test hole or hollow cylindrical

D+15:

Test groove or reentrant surface

C:Test small, light,   thin parts and surface of hardened layer

G:

Test large, thick, heavy and rough surface steel

E: Test super high hardness material

DL: Test slender narrow groove or hole