Hardness Conversion Chart

Hardness Conversion Chart

Tensile strength
Rm  N/mm2
Vickers hardness
HV
 Brinell hardness
HB
Rockwell hardness
HRC

270

85

80.7

285

90

85.2

305

95

90.2

320

100

95.0

335

105

99.8

350

110

105

370

115

109

380

120

114

400

125

119

415

130

124

430

135

128

450

140

133

465

145

138

480

150

143

490

155

147

510

160

152

530

165

156

545

170

162

560

175

166

575

180

171

595

185

176

610

190

181

625

195

185

640

200

190

660

205

195

675

210

199

690

215

204

705

220

209

720

225

214

740

230

219

755

235

223

770

240

228

20.3

785

245

233

21.3

800

250

238

22.2

820

255

242

23.1

835

260

247

24.0

850

265

252

24.8

865

270

257

25.6

880

275

261

26.4

900

280

266

27.1

915

285

271

27.8

930

290

276

28.5

950

295

280

29.2

965

300

285

29.8

995

310

295

31.0

1030

320

304

32.2

1060

330

314

33.3

1095

340

323

34.4

1125

350

333

35.5

1115

360

342

36.6

1190

370

352

37.7

1220

380

361

38.8

1255

390

371

39.8

1290

400

380

40.8

1320

410

390

41.8

1350

420

399

42.7

1385

430

409

43.6

1420

440

418

44.5

1455

450

428

45.3

1485

460

437

46.1

1520

470

447

46.9

1555

480

(456)

47.7

1595

490

(466)

48.4

1630

500

(475)

49.1

1665

510

(485)

49.8

1700

520

(494)

50.5

1740

530

(504)

51.1

1775

540

(513)

51.7

1810

550

(523)

52.3

1845

560

(532)

53.0

1880

570

(542)

53.6

1920

580

(551)

54.1

1955

590

(561)

54.7

1995

600

(570)

55.2

2030

610

(580)

55.7

2070

620

(589)

56.3

2105

630

(599)

56.8

2145

640

(608)

57.3

2180

650

(618)

57.8

660

58.3

670

58.8

680

59.2

690

59.7

700

60.1

720

61.0

740

61.8

760

62.5

780

63.3

800

64.0

820

64.7

840

65.3

860

65.9

880

66.4

900

67.0

920

67.5

940

68.0