Other conversion factors

Hardness is not defined within the SI system. The following ta­ble can be used for conversion between the popular systems used.

Tensile

Strength

Vickers hardness (F > 98 N)

Brinell

Hardness

Rockwell hardness

N/mm2

HV

BHN

HRB

HRc

200

63

60

210

65

62

220

69

66

225

70

67

230

72

68

Tensile

Strength

Vickers hardness {F > 98 N)

Brinell

Hardness

Rockwell hardness

N/mm2

HV

BHN

HRB

HRc

240

75

71

250

79

75

255

80

76

260

82

78

270

85

81

41

280

88

84

45

285

90

86

48

290

91

87

49

300

94

89

51

305

95

90

52

310

97

92

54

320

100

95

56

30

103

98

58

335

105

100

59

340

107

102

60

350

110

105

62

360

113

107

63.5

370

115

109

64.5

380

119

113

66

385

120

114

67

390

122

116

67.5

400

125

119

69

410

128

122

70

415

130

124

71

420

132

125

72

430

135

128

73

440

138

131

74

450

140

133

75

460

143

136

76.5

465

145

138

77

470

147

140

77.5

480

150

143

78.5

490

153

145

79.5

495

155

147

80

500

157

149

81

510

160

152

81.5

520

163

155

82.5

530

165

157

83

540

168

160

84.5

545

170

162

85

550

172

163

85.5 86

86.5 87

560

175

166

570

178

169

575

180

171

580

181

172

590

184

175

88

595

185

176

600

187

178

89

610

190

181

89.5

620

193

184

90

625

195

185

91

91.5

92

92.5

630

197

187

640

200

190

650

203

193

660

205

195

670

208

198

93

675

210

199

93.5

680

212

201

690

215

204

94

700

219

208

705

220

209

95

710

222

211

95.5

720

225

214

96

730

228

216

740

230

219

96.5

750

233

221

97

755

235

223

97.5

760

237

225

770

240

228

98

780

243

231

21

785

245

233

790

247

235

800

250

238

99

22

810

253

240

99.5

820

255

242

23

Tensile

Strength

Vickers hardness (F > 98 N)

Brinell

Hardness

Rockwell hardness

N/mm2

HV

BHN

HRB

HRc

1470

455

432

1480

458

435

1485

460

437

46

1490

461

438

1500

464

441

1510

467

444

1520

470

447

1530

473

449

1540

476

452

47

1550

479

455

1555

480

456

1560

481

457

1570

484

460

1580

486

462

48

1590

489

465

1595

490

466

1600

491

467

1610

494

470

1620

497

472

49

1630

500

475

1640

503

478

1650

506

481

1660

509

483

1665

510

485

1670

511

486

1680

514

488

50

Other conversion factorsValues based on DIN 50150.

Material toughness

Material toughness is not defined by SI. Most materials are as­sessed by conducting impact testing. Two differing test meth­ods can be used with various sizes and styles of test specimen. The following table can be used as a guide to the relative toughness of the various tests:

Other conversion factors

Posted in Fans Ventilation A Practical Guide


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