Hardness Conversion Table

Hardness Conversion Table ASTM

Rockwell C Hardness Range

Approximate Hardness Conversion Numbers for Non-Austenitic Steels, According to ASTM E-140 The Conversion Values contained herein should be considered approximate only and may be inaccurate for specific applications

C

A

D

15N

30N

45N

Vickers

Brinell

Tensile

150 kgf

60 kgf

100 kgf

15 kgf

30 kgf

45 kgf

Hardness

Hardness

Strength

diamond

diamond

diamond

diamond

diamond

diamond

3000 kgf 10mm ball

1000 lbs/square in

68

85.6

76.9

93.2

84.4

75.4

940

..

..

67

85.0

76.1

92.9

83.6

74.2

900

..

..

66

84.5

75.4

92.5

82.8

73.3

865

..

..

65

83.9

74.5

92.2

81.9

72.0

832

(739)

64

83.4

73.8

91.8

81.1

71.0

800

(722)

63

82.8

73.0

91.4

80.1

69.9

772

(705)

62

82.3

72.2

91.1

79.3

68.8

745

(688)

61

81.8

71.5

90.7

78.4

67.7

720

(670)

60

81.2

70.7

90.2

77.5

66.6

697

(654)

59

80.7

69.9

89.8

76.6

65.5

674

(634)

351

58

80.1

69.2

89.3

75.7

64.3

653

615

338

57

79.6

68.5

88.9

74.8

63.2

633

595

325

56

79.0

67.7

88.3

73.9

62.0

613

577

313

55

78.5

66.9

87.9

73.0

60.9

595

560

301

54

78.0

66.1

87.4

72.0

59.8

577

543

292

53

77.4

65.4

86.9

71.2

58.6

560

525

283

52

76.8

64.6

84.4

70.2

57.4

544

512

273

51

76.3

63.8

85.9

69.4

56.1

528

496

264

50

75.9

63.1

85.5

68.5

55.0

513

481

255

49

75.2

62.1

85.0

67.6

53.8

498

469

246

48

74.7

61.4

84.6

66.7

52.5

484

455

237

47

74.1

60.8

83.9

65.8

51.4

471

443

229

46

73.6

60.0

83.5

64.8

50.3

458

432

221

45

73.1

59.2

83.0

64.0

49.0

446

421

215

44

72.5

58.5

82.5

63.1

47.8

434

409

208

43

72.0

57.7

82.0

62.2

46.7

423

400

201

42

71.5

56.9

81.5

61.3

45.5

412

390

195

41

70.9

56.2

80.9

60.4

44.3

402

381

188

40

70.4

55.4

80.4

59.5

43.1

392

371

182

39

69.9

54.6

79.9

58.6

41.9

382

362

177

38

69.4

53.8

79.4

57.7

40.8

372

353

171

37

58.9

53.1

78.8

56.8

39.6

363

344

166

36

68.4

52.3

78.3

55.9

38.4

354

336

161

35

67.9

51.5

77.7

55.0

37.2

345

327

156

34

67.4

50.8

77.2

54.2

36.1

336

319

152

33

66.8

50.0

76.6

53.3

34.9

327

311

149

32

66.3

49.2

76.1

52.1

33.7

318

301

146

31

65.8

48.4

75.6

51.3

32.5

310

294

141

30

65.3

47.7

75.0

50.4

31.3

302

286

138

29

64.8

47.0

74.5

49.5

30.1

294

279

135

28

64.3

46.1

73.9

48.6

28.9

286

271

131

27

63.8

45.2

73.3

47.7

27.8

279

264

128

26

63.3

44.6

72.8

46.8

26.7

272

258

125

25

62.8

43.8

72.2

45.9

25.5

266

253

123

24

62.4

43.1

71.6

45.0

24.3

260

247

119

23

62.0

42.1

71.0

44.0

23.1

254

243

117

22

61.5

41.6

70.5

43.2

22.0

248

237

115

21

61.0

40.9

69.9

42.3

20.7

243

231

112

20

60.5

40.1

69.4

41.5

19.6

238

226

110

Rockwell B Hardness Range

Approximate Hardness Conversion Numbers for Non-Austenitic Steels, according to ASTM E-140 The conversion values contained herein should be considered approximate only and may be inaccurate for specific applications.

Rockwell

Superficial Rockwell

Vickers

Brinell

Tensile

Brinelll

B

A

E

15T

30T

45T

Hardness

Hardness

Strength

Hardness

100 kgf

60 kgf

100 kgf

15 kgf

30 kgf

45 kgf

3000 kgf

1000 lbs/

500 kgf

1/16″ ball

diamond

1/8″ ball

1/16″ ball

1/16″ ball

1/16″ ball

10mm ball

square in

10mm ball

100

61.5

93.1

83.1

72.9

240

240

116

201

99

60.9

82.8

82.5

71.9

234

234

114

195

98

60.2

92.5

81.8

70.9

228

228

109

189

97

59.5

92.1

81.1

69.9

222

222

105

184

96

58.9

91.8

80.4

68.9

216

216

102

179

95

58.3

91.5

79.8

67.9

210

210

100

175

94

57.6

91.2

79.1

66.9

205

205

98

171

93

57.0

90.8

78.4

65.9

200

200

94

167

92

56.4

90.5

77.8

64.8

195

195

92

163

91

55.8

90.2

77.1

63.8

190

190

90

160

90

55.2

89.9

76.4

62.8

186

186

89

157

89

54.6

89.5

76.8

61.8

180

180

88

164

88

64.0

89.2

75.1

60.8

176

176

86

151

87

53.4

88.9

74.4

59.8

172

172

84

148

86

52.8

88.6

73.8

58.8

169

169

83

145

85

52.3

88.2

73.1

57.8

165

165

82

142

84

51.7

87.9

72.4

56.8

162

162

81

140

83

51.1

87.6

71.8

55.8

159

159

80

137

82

50.6

87.3

71.1

54.8

156

156

76

135

81

50.0

86.9

70.4

53.8

153

153

73

133

80

49.5

86.6

69.7

52.8

150

150

72

130

79

48.9

86.3

69.1

51.8

147

147

70

128

78

48.4

86.0

68.4

50.8

144

144

69

126

77

47.9

85.6

67.7

49.8

141

141

68

124

76

47.3

85.3

67.1

48.8

139

139

67

122

75

46.8

86.0

66.4

47.8

137

137

66

120

74

46.3

84.7

65.7

46.8

135

135

66

118

73

45.8

84.3

65.1

45.8

132

132

64

116

72

45.3

84.0

64.4

44.8

130

130

63

114

71

44.8

100.0

83.7

63.7

43.8

127

127

62

112

70

44.3

99.5

83.4

63.1

42.8

125

125

61

110

69

43.8

99.0

83.0

62.4

41.8

123

123

60

109

68

43.3

98.0

82.7

61.7

40.8

121

121

59

108

67

42.8

97.5

82.4

61.0

39.8

119

119

58

106

66

42.3

97.0

82.1

60.4

38.7

117

117

57

104

65

41.8

96.0

81.8

59.7

37.7

116

116

56

102

64

41.4

95.5

81.4

59.0

36.7

114

114

100

63

40.9

95.0

81.1

58.4

35.7

112

112

99

62

40.4

94.5

80.8

57.7

34.7

110

110

98

61

40.0

93.5

80.5

57.0

33.7

108

108

96

60

39.5

93.0

80.1

56.4

32.7

107

107

95

59

39.0

92.5

79.8

55.7

31.7

106

106

94

58

38.6

92.0

79.5

55.0

30.7

104

104

92

57

38.1

91.0

79.2

54.4

3.0

103

103

91

56

37.7

90.6

78.8

53.7

28.7

101

101

90

55

37.2

90.0

78.6

53.0

27.7

100

100

89

54

36.8

89.5

78.2

52.4

26.7

87

53

36.3

89.0

77.9

51.7

26.7

86

52

35.9

88.0

77.5

51.0

24.7

85

51

35.5

87.6

77.2

50.3

23.7

84

50

35.0

87.0

76.9

49.7

22.7

83

49

34.6

86.5

76.6

49.0

21.7

82

48

34.1

85.5

76.2

48.3

20.7

81

47

33.7

85.0

75.9

47.7

19.7

80

46

33.3

84.6

76.6

47.0

18.7

80

45

32.9

84.0

76.3

46.3

17.7

79

44

32.4

83.5

74.9

45.7

16.7

78

43

32.0

82.5

74.6

45.0

15.7

77

42

31.6

82.0

74.3

44.3

14.7

76

41

31.2

81.5

74.0

43.7

13.6

75

40

30.7

81.0

73.6

43.0

12.6

75

39

30.3

80.0

73.3

42.3

11.6

74

38

29.9

79.5

73.0

41.6

10.6

73

37

29.5

79.0

72.7

41.0

9.6

72

36

29.1

78.5

72.3

40.3

8.6

72

35

28.7

78.0

72.0

39.6

7.6

71

34

28.2

77.0

71.7

39.0

6.6

70

33

27.8

76.6

71.4

38.3

5.6

69

32

27.4

76.0

71.0

37.6

4.6

69

31

27.0

75.5

70.7

37.0

3.6

68

30

26.6

75.0

70.4

36.3

2.6

67

Hardness values in brackets are outside the range recommended for Brinell testing in ASTM E-10. The above table is from ASTM E-110 except values for E-scale and Tensile Strength which are not from or according to ASTM Standards. Reprinted from the Annual Book of ASTM Standards, copyright American Society for Testing and Materials.

You may also like...

error: Content is protected !!