Cross Reference for hardness of steel

Note: Hardness conversions are approximate only, a s different scales use different methods of testing

Brinell Impression Brinell Hardness Vickers hardness Rockwell Hardness (HRB) Rockwell Hardness (HRC) Tensile Strength
Equiv Rm tonf/in2 Equiv Rm kgf/mm2 Equiv Rm N/mm2 ( Approx) 1000 psi
Dia. mm HB HV B C
2.50 601 640 - 57.0 - - - 328
2.55 578 615 - 56.0 - - - 313
2.6055559112054.5---298
2.65534 569 119 53.5 - - - 288
2.70 514 547 119 52.0 -- - 274
2.75 495 528 117 51.0- - -264
2.80 477 508 117 49.5 - - - 252

2.85

461

491

116

48.5

101

160

1569

242

2.90

444

474

115

47.0

98

155

1520

230

2.95

429

455

115

45.5

95

150

1471

219

3.00

415

440

114

44.5

92

145

1422

212

3.05

401

425

113

43.0

88

139

1363

202

3.10

388

410

112

42.0

85

134

1314

193

3.15

375

396

112

40.5

82

129

1265

184

3.20

363

383

110

39.0

80

126

1236

177

3.25

352

372

110

38.0

77

121

1187

171

3.30

341

360

109

36.5

75

118

1157

164

3.35

331

350

109

35.5

73

114

1118

159

3.40

321

339

108

34.5

71

111

1089

153

3.45

311

328

108

33.0

68

107

1049

149

3.50

302

319

107

32.0

66

104

1020

146

3.55

293

309

106

31.0

64

101

990

141

3.60

285

301

105

30.0

63

99

971

138

3.65

277

292

104

29.0

61

96

941

134

3.70

269

284

104

27.5

59

93

912

130

3.75

262

276

103

26.5

58

91

892

127

3.80

255

269

102

25.5

56

89

873

124

3.85

248

261

102

24.0

55

87

853

120

3.90

241

253

100

23.0

53

84

824

116

3.95

235

247

99

22.0

51

81

794

114

4.00

229

241

98

20.5

50

79

775

111

4.05

223

235

97

-

49

77

755

104

4.10

217

228

96

-

48

76

745

103

4.15

212

223

96

-

46

73

716

100

4.20

207

218

95

-

45

71

696

99

4.30

197

208

93

-

43

68

667

94

4.40

187

197

91

-

41

65

637

90

4.50

179

189

89

-

39

62

608

88

4.60

170

179

87

-

36

57

559

84

4.70

163

172

85

-

35

55

539

82

4.80

156

165

83

-

34

54

530

80

4.90

149

157

81

-

32

51

500

73

5.00

143

150

79

-

31

49

481

71

5.10

137

144

77

-

31

49

481

67

5.20

131

138

74

-

30

47

461

65

5.30

126

133

72

-

29

46

451

63

5.40

121

127

70

-

28

44

431

60

5.50

116

122

68

-

27

43

422

58

5.60

111

117

66

-

26

41

402

56

Disclaimer: This table lists approximate relationship of hardn ess values to corresponding approximate tensile str ength values of steels. Some compositions and proce ssing histories may deviate from these relationships. The data in this table do not represent hardness-to-te nsile strength conversions for austenitic, ferritic , and martensitic stainless steel. If more precise conversions are required, th ey should be developed for each specific compositio n and heat treatment. Related Rockwell superficial hardness numbers, if of interest, may be found in ASTM A 370-68.

Download PDF version of Cross reference for Hardness of steel.pdf


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