Steel Suppliers and stockholders - KV Steel Services, Darlaston, West Midlands

Guide to the selection of through hardening steels, based on tensile strength and ruling section

See below for Steel Hardness comparison table

Heat
Treatment
Condition

Tensile
Strength
Range

Hardness
Range
BHN

Ruling Section

<=13mm

>13 <=19mm

>19 <=29mm

>29 <=63mm

>63 <=100mm

>100 <=150mm

>150  <=250mm

Q

625-775 n/mm2
40-50 TSI

179-229

080M40
150M19

080M40
150M19

080M40
150M19

080M40
150M19

708M40

R

700-850 n/mm2

45-55 TSI

201-255

080M40
150M19
606M36

080M40
070M55
150M19
606M36

070M55
150M19
606M36

070M55
605M36

070M55
605M36

605M36
708M40
709M40

605M36
708M40
709M40

S

775-925 n/mm2

50-60 TSI

223-277

070M55
606M36

070M55
605M36
606M36

070M55
605M36
606M36

070M55
605M36
606M36
708M40

605M36
708M40
709M40

709M40

709M40

T

850-1000 n/mm2

55-65 TSI

248-302

070M55
605M36
606M36
708M40

070M55
605M36
606M36
708M40

605M36
606M36
708M40

605M36
708M40
709M40

605M36
708M40
709M40
817M40

817M40

817M40

U

925-1075 n/mm2

60-70 TSI

269-331

605M36
708M40

605M36
708M40
709M40

605M36
708M40
709M40

709M40
817M40

709M40
817M40

826M40

826M40

V

1000-1150 n/mm2

75-80 TSI

293-352

605M36
708M40
709M40

605M36
708M40
709M40
817M40

709M40
817M40

817M40

826M40

826M40

826M40

W

1075-1225 n/mm2

80-85 TSI

311-375

708M40
709M40
817M40

709M40
817M40

817M40

826M40

826M40

826M40

826M40

Reference should be made to the appropriate standards for yield and impact properties.

For steels required in conditions X, Y or Z, please refer to our Technical Department.

The steels listed above represent the most commonly available grades. 
Other specifications exist which fulfil these requirements. Please enquire for other grades.

Steel Hardness comparison table, with equivalent tensile strength*

Hardness no. HB

Hardness no. HV

Hardness HRC

Equiv. UTS n/mm2

 

Hardness no. HB

Hardness no. HV

Hardness HRC

Equiv. UTS n/mm2

899

856

817

780

745

712

682

653

627

601

578

555

534

514

495

477

461

444

429

415

401

388

375

363

352

341

331

321

311

302

293

285

277

269

262

255

248

241

235

229

 

 

 

1150

1050

960

885

820

765

717

675

633

598

567

540

515

494

472

454

437

420

404

389

375

363

350

339

327

316

305

296

287

279

270

263

256

248

241

235

229

 

 

 

70

68

66

64

62

60

58

57

55

53

52

50

49

47

46

45

44

42

41

40

38

37

36

35

34

33

32

31

30

29

28

26

25

24

23

22

21

3027

2888

2749

2641

2517

2409

2286

2193

2116

2023

1946

1869

1792

1730

1668

1606

1544

1498

1452

1406

1359

1297

1266

1220

1174

1143

1112

1081

1050

1019

988

958

927

911

880

849

834

803

788

772

 

223

217

212

207

201

197

192

187

183

179

174

170

167

163

159

156

152

149

146

143

140

137

134

131

128

126

123

121

118

116

114

111

109

107

105

103

101

99.2

97.3

95.5

223

217

212

207

202

197

192

187

183

179

174

170

166

163

159

156

153

149

146

143

140

137

134

131

128

126

124

121

118

116

114

112

109

107

105

103

101

99

97

95

20

18

17

16

15

13

12

10

9

8

7

6

4

3

2

1

0

757

726

710

695

680

664

649

633

618

610

602

595

587

579

564

556

541

526

517

510

494

486

479

463

456

448

440

432

417

409

402

394

386

378

371

363

355

351

347

340

Steel Hardness Comparison Table.

This comparison table is intended as a guide only.  The equivalents should be treated with discretion. 

*Certain conditions may affect the relationship between hardness and tensile strength.

KV Steel Services is a supplier of quality steel to precision engineering businesses