Steel Hardness Conversion Chart

Hardness Conversion Chart

Hardness Conversion Table

Steel Hardness Conversion Table, Hardness ranges for heat treated steel, Hardness Conversion Calculator, Steel Hardness Chart, check Hardness Conversion Chart

Steel Hardness Conversion Table

Hardness ranges for heat treated steel

Heat
Treated
Condition
Q R S T U V W X Z
Tensile
Strength

625-775 n/mm2

700-850 n/mm2

775-925 n/mm2

850-1000 n/mm2

925-1075 n/mm2

1000-1150 n/mm2

1075-1225 n/mm2

1150-1300 n/mm2

1550 n/mm2

Hardness
Brinell
179-229 201-225 223-277 248-302 269-331 293-352 311-375 345-401 444

Steel Hardness Conversion Table

You can see approximate hardness of steel using Brinell, Rockwell B and C and Vickers scales in below table. Please note these conversion charts are just for guidance only as each scales uses different methods of measuring hardness. The right hand column show an approximate equivalent tensile strength.

Steel Hardness conversion calculator
Brinell Hardness HB Rockwell C – HRC Rockwell B – HRB Vickers – HV  
Enter a figure into any of the fields and click calculate, the nearest values in each scale is shown, or zero if out of range. Values are approximate and for guidance only.

Low Alloy Steel Hardness Conversion Chart

*The following chart applies to plain carbon, low-alloy steels, cast steel and to a limited extent high-alloy and/or work hardened steel*

Brinell 3000kg Load 10mm Ball Rockwell Approximate Tensile Strength (PSI)
Diameter, mm Hardness Number B Scale C Scale
2.85 461 48.5 242,000
2.90 444 47.1 230,000
2.95 429 45.7 219,000
3.00 415 44.5 212,000
3.05 401 43.1 202,000
3.10 388 41.8 193,000
3.15 375 40.4 184,000
3.20 363 39.1 177,000
3.25 352 110.0 37.9 170,000
3.30 341 109.0 36.6 163,000
3.35 331 108.5 35.5 158,000
3.40 321 108.0 34.3 152,000
3.45 311 107.5 33.1 147,000
3.50 302 107.0 32.1 143,000
3.55 293 106.0 30.9 139,000
3.60 285 105.5 29.9 136,000
3.65 277 104.5 28.8 131,000
3.70 269 104.0 27.6 128,000
3.75 262 103.0 26.6 125,000
3.80 255 102.0 25.4 121,000
3.85 248 101.0 24.2 118,000
3.90 241 100.0 22.8 114,000
3.95 235 99.0 21.7 111,000
4.00 229 98.2 20.5 109,000
4.05 223 97.3 18.8 104,000
4.10 217 96.4 17.5 103,000
4.15 212 95.5 16.0 100,000
4.20 207 94.6 15.2 99,000
4.25 201 93.8 13.8 97,000
4.30 197 92.8 12.7 94,000
4.35 192 91.9 11.5 92,000
4.40 187 90.7 10.0 90,000
4.45 183 90.0 9.0 89,000
4.50 179 89.0 8.0 88,000
4.55 174 87.8 6.4 86,000
4.60 170 86.8 5.4 84,000
4.65 167 86.0 4.4 83,000
4.70 163 85.0 3.3 82,000
4.80 156 82.9 0.9 80,000
4.90 149 80.8
5.00 143 78.7
5.10 137 76.4
5.20 131 74.0
5.30 126 72.0
5.40 121 69.8
5.50 116 67.6
5.60 111 65.7

Hardness conversion chart for Copper

Hardness conversion chart for Copper

 

Reference Table: Steel hardness conversion chart – all values approximate.

Brinell Hardness
HB
Rockwell
HRC
Rockwell
HRB
Vickers
HV
N/mm²
       
800 72    
780 71    
760 70    
752 69    
745 68    
746 67    
735 66    
711 65    
695 64    
681 63    
658 62    
642 61    
627 60    
613 59    
601 58   746
592 57   727
572 56   694
552 55   649
534 54 120 589
513 53 119 567
504 52 118 549
486 51 118 531
469 50 117 505
468 49 117 497
456 48 116 490 1569
445 47 115 474 1520
430 46 115 458 1471
419 45 114 448 1447
415 44 114 438 1422
402 43 114 424 1390
388 42 113 406 1363
375 41 112 393 1314
373 40 111 388 1265
360 39 111 376 1236
348 38 110 361 1187
341 37 109 351 1157
331 36 109 342 1118
322 35 108 332 1089
314 34 108 320 1049
308 33 107 311 1035
300 32 107 303 1020
290 31 106 292 990
277 30 105 285 971
271 29 104 277 941
264 28 103 271 892
262 27 103 262 880
255 26 102 258 870
250 25 101 255 853
245 24 100 252 838
240 23 100 247 824
233 22 99 241 794
229 21 98 235 775
223 20 97 227 755
216 19 96 222 716
212 18 95 218 706
208 17 95 210 696
203 16 94 201 680
199 15 93 199 667
191 14 92 197 657
190 13 92 186 648
186 12 91 184 637
183 11 90 183 617
180 10 89 180 608
175 9 88 178 685
170 7 87 175 559
167 6 86 172 555
166 5 86 168 549
163 4 85 162 539
160 3 84 160 535
156 2 83 158 530
154 1 82 152 515
149   81 149 500
147   80 147 490
143   79 146 482
141   78 144 481
139   77 142 480
137   76 140 475
135   75 137 467
131   74 134 461
127   72 129 451
121   70 127 431
116   68 124 422
114   67 121 412
111   66 118 402
107   64 115 382
105   62 112 378
103   61 108 373
95   56 104
90   52 95
81   41 85
76   37 80
Brinell
HB
Rockwell
HRC
Rockwell
HRB
Vickers
HV
N/mm²
3000kg
10mm Ball
150kg 
Brale
100kg
1/16" Ball

Diamond Pyramid 
120kg

Tensile strength (Approx)

Reference table: Steel Hardness conversion chart

Since the various types of hardness tests do not all measure the same combination of material properties, conversion from one hardness scale to another is only an approximate process. Because of the wide range of variation among different materials, it is not possible to state confidence limits for the errors in using a conversion chart.

Hardness Conversion Chart

Rockwell


Rockwell Superficial


Brinell

Vickers

Shore

 


A


B


C


D


E


F


15-N


30-N


45-N


30-T

3000 kg

500 kg

136

 


Approx Tensile Strength (psi)

60kg Brale

100kg 1/16″ Ball

150kg Brale

100kg Brale

100kg 1/8″ Ball

60kg 1/16″ Ball

15kg Brale

30kg Brale

45kg Brale

30 kg 1/16″ Ball

10mm Ball Steel

10mm Ball Steel

Diamond Pyramid

Sciero-scope

86.5

70

78.5

94.0

86.0

77.6

1076

101

86.0

69

77.7

93.5

85.0

76.5

1044

99

85.6

68

76.9

93.2

84.4

75.4

940

97

85.0

67

76.1

92.9

83.6

74.2

900

95

84.5

66

75.4

92.5

82.8

73.2

865

92

83.9

65

74.5

92.2

81.9

72.0

739

832

91

83.4

64

73.8

91.8

81.1

71.0

722

800

88

82.8

63

73.0

91.4

80.1

69.9

705

772

87

82.3

62

72.2

91.1

79.3

68.8

688

746

85

81.8

61

71.5

90.7

78.4

67.7

670

720

83

81.2

60

70.7

90.2

77.5

66.6

654

697

81

320,000

80.7

59

69.9

89.8

76.6

65.5

634

674

80

310,000

80.1

58

69.2

89.3

75.7

64.3

615

653

78

300,000

79.6

57

68.5

88.9

74.8

63.2

595

633

76

290,000

79.0

56

67.7

88.3

73.9

62.0

577

613

75

282,000

78.5

120

55

66.9

87.9

73.0

60.9

560

595

74

274,000

78.0

120

54

66.1

87.4

72.0

59.8

543

577

72

266,000

77.4

119

53

65.4

86.9

71.2

58.6

525

560

71

257,000

76.8

119

52

64.6

86.4

70.2

57.4

500

544

69

245,000

76.3

118

51

63.8

85.9

69.4

56.1

487

528

68

239,000

75.9

117

50

63.1

85.5

68.5

55.0

475

513

67

233,000

75.2

117

49

62.1

85.0

67.6

53.8

464

498

66

227,000

74.7

116

48

61.4

84.5

66.7

52.5

451

484

64

221,000

74.1

116

47

60.8

83.9

65.8

51.4

442

471

63

217,000

73.6

115

46

60.0

83.5

64.8

50.3

432

458

62

212,000

73.1

115

45

59.2

83.0

64.0

49.0

421

446

60

206,000

72.5

114

44

58.5

82.5

63.1

47.8

409

434

58

200,000

72.0

113

43

57.7

82.0

62.2

46.7

400

423

57

196,000

71.5

113

42

56.9

81.5

61.3

45.5

390

412

56

191,000

70.9

112

41

56.2

80.9

60.4

44.3

381

402

55

187,000

70.4

112

40

55.4

80.4

59.5

43.1

371

392

54

182,000

69.9

111

39

54.6

79.9

58.6

41.9

362

382

52

177,000

69.4

110

38

53.8

79.4

57.7

40.8

353

372

51

173,000

68.9

110

37

53.1

78.8

56.8

39.6

344

363

50

169,000

68.4

109

36

52.3

78.3

55.9

38.4

336

354

49

165,000

67.9

109

35

51.5

77.7

55.0

37.2

327

345

48

160,000

67.4

108

34

50.8

77.2

54.2

36.1

319

336

47

156,000

66.8

108

33

50.0

76.6

53.3

34.9

311

327

46

152,000

66.3

107

32

49.2

76.1

52.1

33.7

301

318

44

147,000

65.8

106

31

48.4

75.6

51.3

32.5

294

310

43

144,000

65.3

105

30

47.7

75.0

50.4

31.3

286

302

42

140,000

64.7

104

29

47.0

74.5

49.5

30.1

279

294

41

137,000

64.3

104

28

46.1

73.9

48.6

28.9

271

286

41

133,000

63.8

103

27

45.2

73.3

47.7

27.8

264

279

40

129,000

63.3

103

26

44.6

72.8

46.8

26.7

258

272

39

126,000

62.8

102

25

43.8

72.2

45.9

25.5

253

266

38

124,000

62.4

101

24

43.1

71.6

45.0

24.3

247

260

37

121,000

62.0

100

23

42.1

71.0

44.0

23.1

82.0

240

201

254

36

118,000

61.5

99

22

41.6

70.5

43.2

22.0

81.5

234

195

248

35

115,000

61.0

98

21

40.9

69.9

42.3

20.7

81.0

228

189

243

35

112,000

60.5

97

20

40.1

69.4

41.5

19.6

80.5

222

184

238

34

109,000

59.0

96

18

80.0

216

179

230

33

106,000

58.0

95

16

79.0

210

175

222

32

103,000

57.5

94

15

78.5

205

171

213

31

100,000

57.0

93

13

78.0

200

167

208

30

98,000

56.5

92

12

77.5

195

163

204

29

96,000

56.0

91

10

77.0

190

160

196

28

93,000

55.5

90

9

76.0

185

157

192

27

91,000

55.0

89

8

75.5

180

154

188

26

88,000

54.0

88

7

75.0

176

151

184

26

86,000

53.5

87

6

74.5

172

148

180

26

84,000

53.0

86

5

74.0

169

145

176

25

83,000

52.5

85

4

73.5

165

142

173

25

81,000

52.0

84

3

73.0

162

140

170

25

79,000

51.0

83

2

72.0

159

137

166

24

78,000

50.5

82

1

71.5

156

135

163

24

76,000

50.0

81

0

71.0

153

133

160

24

75,000

49.5

80

70.0

150

130

73,000

49.0

79

69.5

147

128

48.5

78

69.0

144

126

48.0

77

68.0

141

124

47.0

76

67.5

139

122

46.5

75

99.5

67.0

137

120

46.0

74

99.0

66.0

135

118

45.5

73

98.5

65.5

132

116

45.0

72

98.0

65.0

130

114

44.5

71

100.0

97.5

64.2

127

112

44.0

70

99.5

97.0

63.5

125

110

43.5

69

99.0

96.0

62.8

123

109

43.0

68

98.0

95.5

62.0

121

107

42.5

67

97.5

95.0

61.4

119

106

42.0

66

97.0

94.5

60.5

117

104

41.8

65

96.0

94.0

60.1

116

102

41.5

64

95.5

93.5

59.5

114

101

41.0

63

95.0

93.0

58.7

112

99

40.5

62

94.5

92.0

58.0

110

98

40.0

61

93.5

91.5

57.3

108

96

39.5

60

93.0

91.0

56.5

107

95

39.0

59

92.5

90.5

55.9

106

94

38.5

58

92.0

90.0

55.0

104

92

38.0

57

91.0

89.5

54.6

102

91

37.8

56

90.5

89.0

54.0

101

90

37.5

55

90.0

88.0

53.2

99

89

37.0

54

89.5

87.5

52.5

87

36.5

53

89.0

87.0

51.8

86

36.0

52

88.0

86.5

51.0

85

35.5

51

87.5

86.0

50.4

84

35.0

50

87.0

85.5

49.5

83

34.8

49

86.5

85.0

49.1

82

34.5

48

85.5

84.5

48.5

81

34.0

47

85.0

84.0

47.7

80

33.5

46

84.5

83.0

47.0

79

33.0

45

84.0

82.5

46.2

79

32.5

44

83.5

82.0

45.5

78

32.0

43

82.5

81.5

44.8

77

31.5

42

82.0

81.0

44.0

76

31.0

41

81.5

80.5

43.4

75

30.8

40

81.0

79.5

43.0

74

30.5

39

80.0

79.0

42.1

74

30.0

38

79.5

78.5

41.5

73

29.5

37

79.0

78.0

40.7

72

29.0

36

78.5

77.5

40.0

71

28.5

35

78.0

77.0

39.3

71

28.0

34

77.0

76.5

38.5

70

27.8

33

76.5

75.5

37.9

69

27.5

32

76.0

75.0

37.5

68

27.0

31

75.5

74.5

36.6

68

26.5

30

75.0

74.0

36.0

67

26.0

29

74.0

73.5

35.2

66

25.5

28

73.5

73.0

34.5

66

25.0

27

73.0

72.5

33.8

65

24.5

26

72.5

72.0

33.1

65

24.2

25

72.0

71.0

32.4

64

24.0

24

71.0

70.5

32.0

64

23.5

23

70.5

70.0

31.1

63

23.0

22

70.0

69.5

30.4

63

22.5

21

69.5

69.0

29.7

62

22.0

20

68.5

68.5

29.0

62

21.5

19

68.0

68.0

28.1

61

21.2

18

67.5

67.0

27.4

61

21.0

17

67.0

66.5

26.7

60

20.5

16

66.5

66.0

26.0

60

20.0

15

65.5

65.5

25.3

59

14

65.0

65.0

24.6

59

13

64.5

64.5

23.9

58

12

64.0

64.0

23.5

58

11

63.5

63.5

22.6

57

10

62.5

63.0

21.9

57

9

62.0

62.0

21.2

56

8

61.5

61.5

20.5

56

7

61.0

61.0

19.8

56

6

60.5

60.5

19.1

55

5

60.0

60.0

18.4

55

4

59.0

59.5

18.0

55

3

58.5

59.0

17.1

54

2

58.0

58.0

16.4

54

1

57.5

57.5

15.7

53

0

57.0

57.0

15.0

53

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