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BS970 Specifications

BS 970 steels.

Basic Notes on steels….. Sample specifications……
BS 970 numbering system explained…… Modern equivalents to BS 970 1955;EN numbers……

BS 970 chemical composition table

Grade

Chemical composition (% by mass – max unless stated)

–

Others

Ferritic steels

403S17

0.08

1.00

1.0

0.030

0.040

12.0/14.0

0.50

–

430S17

0.08

1.00

1.0

0.030

0.040

16.0/18.0

0.50

–

Martensitic steels

410S21

0.09/0.15

1.00

1.0

0.030

0.040

11.5/13.5

1.00

–

416S21

0.09/0.15

1.00

1.5

0.15/0.35

0.060

11.5/13.5

1.00

0.60

–

416S29

0.14/0.20

1.00

1.5

0.15/0.35

0.060

11.5/13.5

1.00

0.60

416S37

0.20/0.28

1.00

1.5

0.15/0.35

0.060

12.0/14.0

1.00

0.60

416S41

0.09/0.15

1.00

1.5

0.060

11.5/13.5

1.00

0.60

Se: 0.15/0.35

420S29

0.14/0.20

1.00

1.0

0.030

0.040

11.5/13.5

1.00

–

420S37

0.20/0.28

1.00

1.0

0.030

0.040

12.0/14.0

1.00

–

431S29

0.12/0.20

1.00

1.0

0.030

0.040

15.0/18.0

2.0/3.0

–

Austenitic steels

302S31

0.12

1.00

2.0

0.030

0.045

17.0/19.0

8.0/10.0

–

304S11

0.030

1.00

2.0

0.030

0.045

17.0/19.0

9.0/12.0

–

303S15

0.06

1.00

2.0

0.030

0.045

17.5/19.0

8.0/11.0

–

304S31

0.07

1.00

2.0

0.030

0.045

17.0/19.0

8.0/11.0

–

321S31

0.08

1.00

2.0

0.030

0.045

17.0/19.0

9.0/12.0

–

Ti: 5C/080

347S31

0.08

1.00

2.0

0.030

0.045

17.0/19.0

9.0/12.0

–

Nb: 10C/1.0

316S11

0.030

1.00

2.0

0.030

0.045

16.5/18.5

11.0/14.0

2.00/2.50

–

316S13

0.030

1.00

2.0

0.030

0.045

16.5/18.5

11.5/14.5

2.50/3.00

–

316S31

0.07

1.00

2.0

0.030

0.045

16.5/18.5

10.5/13.5

2.00/2.50

–

316S33

0.07

1.00

2.0

0.030

0.045

16.5/18.5

11.0/14.0

2.50/3.00

–

320S31

0.08

1.00

2.0

0.030

0.045

16.5/18.5

11.0/14.0

2.00/2.50

Ti: 5C/0.80

310S31

0.15

1.50

2.0

0.030

0.045

24.0/26.0

19.0/22.0

–

303S31

0.12

1.00

2.0

0.15/0.35

0.060

17.0/19.0

8.0/10.0

1.00

303S42

0.12

1.00

2.0

0.060

17.0/19.0

8.0/10.0

1.00

Se: 0.15/0.35

325S31

0.12

1.00

2.0

0.15/0.35

0.045

17.0/19.0

8.0/11.0

–

Ti: 5C/090

BS970 – 1955 SPECIFICATIONS

Grade

Others

EN1A

0.07/0.15

0.80/1.20

0.10 M

0.20/0.30

0.07

EN1B

0.07/0.15

1.00/1.40

0.10 M

0.30/0.60

0.06

EN1AL

0.07/0.15

0.80/1.20

0.10 M

0.20/0.30

0.07

Pb-0.15/0.35

EN2

0.20 M

0.80 M

0.06

EN2A

0.12 M

0.50 M

0.05

EN2A/1

0.10 M

0.50 M

0.04

EN2B

0.15 M

0.50 M

0.05

EN2C

0.15/0.25

0.40/0.60

0.05

EN2D

0.15/0.30

0.40/0.70

0.05

EN2E

0.15 M

0.50 M

0.10/0.35

0.05

EN3

0.25 M

1.00 M

0.05/0.35

0.06

EN3A

0.15/0.25

0.40/0.90

0.05/0.35

0.06

EN3B

0.25 M

1.00 M

0.35 M

0.06

EN3C

0.17/0.23

0.60/1.00

0.05/0.35

0.05

EN3D

0.15/0.25

0.60/1.00

0.05/0.35

0.06

EN4

0.30 M

1.00 M

0.05/0.35

0.06

EN4A

0.30 M

1.00 M

0.05/0.35

0.06

EN5

0.25/0.35

0.60/1.00

0.05/0.35

0.06

EN5K

0.25/0.35

0.60/1.00

0.05/0.35

0.05

EN5A

0.25/0.30

0.70/0.90

0.05/0.35

0.06

EN5B

0.28/0.33

0.70/0.90

0.05/0.35

0.06

EN5C

0.30/0.35

0.70/0.90

0.05/0.35

0.06

EN5D

0.25/0.35

0.60/1.00

0.05/0.35

0.06

EN6

0.40 M

0.50/0.90

0.05/0.35

0.06

EN6K

0.40 M

0.50/0.90

0.05/0.35

0.06

EN6A

0.40 M

0.50/0.90

0.05/0.35

0.06

EN7

0.10/0.30

1.00/1.30

0.25 M

0.10/0.18

0.06

EN7A

0.12/0.18

1.00/1.50

0.25 M

0.10/0.18

0.06

EN8

0.35/0.45

0.60/1.00

0.05/0.35

0.06

EN8A

0.33/0.38

0.70/0.90

0.05/0.35

0.06

EN8B

0.35/0.40

0.70/0.90

0.05/0.35

0.06

EN8C

0.38/0.43

0.70/0.90

0.05/0.35

0.06

EN8D

0.40/0.45

0.70/0.90

0.05/0.35

0.06

EN8E

0.35/0.40

0.90/1.10

0.05/0.35

0.06

EN8K

0.35/0.45

0.60/1.00

0.05/0.35

0.05

EN8M

0.35/0.45

1.00/1.30

0.25 M

0.12/0.20

0.06

EN8AM

0.33/0.38

0.90/1.30

0.25 M

0.12/0.20

0.06

EN8BM

0.35/0.40

0.90/1.30

0.25 M

0.12/0.20

0.06

EN8CM

0.38/0.43

0.90/1.30

0.25 M

0.12/0.20

0.06

EN8DM

0.40/0.45

0.90/1.30

0.25 M

0.12/20

0.06

EN9

0.50/0.60

0.50/0.80

0.05/0.35

0.06

EN9K

0.50/0.60

0.50/0.80

0.05/0.35

0.05

EN10

0.50/0.60

0.50/0.80

0.05/0.35

0.50/0.80

0.06

EN11

0.50/0.70

0.50/0.80

0.10/0.35

0.50/0.80

0.05

EN12

0.30/0.45

1.50 M

0.10/0.35

0.60/1.00

0.05

EN12A

0.30/0.35

0.70/0.90

0.10/0.35

0.60/1.00

0.05

EN12B

0.35/0.40

0.70/0.90

0.10/0.35

0.60/1.00

0.05

EN12C

0.40/0.45

0.70/0.90

0.10/0.35

0.60/1.00

0.05

EN13

0.15/0.25

1.40/1.80

0.10/0.35

0.40/0.70

0.15/0.35

0.05

EN14A

0.15/0.25

1.30/1.70

0.10/0.35

0.25 M

0.40 M

0.06

EN14A/1

0.23 M

1.20 Min

0.05/0.35

0.06

EN14B

0.20/0.30

1.30/1.70

0.10/0.35

0.40 M

0.06

EN15

0.30/0.40

1.30/1.70

0.10/0.35

0.05

EN15A

0.30/0.40

1.30/1.70

0.05/0.35

0.06

EN15AM

0.30/0.40

1.30/1.70

0.25 M

0.12/0.20

0.06

EN15B

0.35/0.40

1.10/1.30

0.05/0.35

0.06

EN16

0.30/0.40

1.30/1.80

0.10/0.35

0.20/0.35

0.05

EN16A

0.25/0.30

1.30/1.80

0.10/0.35

0.20/0.35

0.05

EN16B

0.30/0.35

1.30/1.80

0.10/0.35

0.20/0.35

0.05

EN16C

0.35/0.40

1.30/1.80

0.10/0.35

0.20/0.35

0.05

EN16M

0.30/0.40

1.30/0.80

0.25 M

0.20/0.35

0.12/0.20

0.05

EN17

0.30/0.40

1.30/1.80

0.10/0.35

0.35/0.55

0.05

EN18

0.35/0.45

0.60/0.95

0.10/0.35

0.85/1.15

0.05

EN18A

0.27/0.32

0.65/0.80

0.10/0.35

0.85/1.15

0.05

EN18B

0.30/0.35

0.65/0.80

0.10/0.35

0.85/1.15

0.05

EN18C

0.35/0.38

0.65/0.80

0.10/0.35

0.85/1.15

0.05

EN18D

0.38/0.43

0.65/0.80

0.10/0.35

0.85/1.15

0.05

EN19

0.35/0.45

0.50/0.80

0.10/0.35

0.90/1.50

0.20/0.40

0.05

EN19A

0.35/0.45

0.50/0.80

0.10/0.35

0.90/1.50

0.20/0.35

0.05

EN19B

0.35/0.45

0.50/0.80

0.10/0.35

0.90/1.50

0.20/0.35

0.05

EN19C

0.40/0.45

0.50/0.80

0.10/0.35

0.90/1.50

0.20/0.35

0.05

EN20A

0.20/0.30

0.40/0.70

0.10/0.35

0.50/1.00

0.50/0.80

0.05

EN20B

0.35/0.45

0.40/0.70

0.10/0.35

0.50/1.00

0.50/0.80

0.05

EN21

0.25/0.35

0.35/0.75

0.10/0.35

0.30 M

2.75/3.25

0.05

EN21A

0.20/0.30

0.60 M

0.10/0.35

2.50/3.50

0.05

EN22

0.35/0.45

0.50/0.80

0.10/0.35

0.30 M

3.25/3.75

0.5

0.05

EN23

0.25/0.35

0.45/0.70

0.10/0.35

0.50/1.00

2.75/3.50

0.65 M

0.05

EN24

0.35/0.45

0.45/0.70

0.10/0.35

0.90/1.40

1.30/1.80

0.20/0.35

0.05

EN25

0.27/0.35

0.50/0.70

0.10/0.35

0.50/0.80

2.30/2.80

0.40/0.70

0.05

EN26

0.36/0.44

0.50/0.70

0.10/0.35

0.50/0.80

2.30/2.80

0.40/0.70

0.05

EN27

0.25/0.35

0.70 M

0.10/0.35

0.50/1.30

3.00/3.75

0.20/0.65

0.05

EN28

0.25/0.40

0.70 M

0.10/0.35

0.75/1.50

3.00/4.50

0.20/0.65

0.05

EN29A

0.15/0.25

0.65 M

0.10/0.35

2.50/3.50

0.40 M

0.30/0.70

0.05

EN29B

0.25/0.35

0.65 M

0.10/0.35

2.50/3.50

0.40 M

0.30/0.70

0.05

EN30A

0.26/0.34

0.40/0.60

0.10/0.35

1.10/1.40

3.90/4.30

0.05

EN30B

0.26/0.34

0.40/0.60

0.10/0.35

1.10/1.40

3.90/4.30

0.20/0.40

0.05

EN31

0.90/1.20

0.30/0.75

0.10/0.35

1.00/1.60

0.05

EN32A

0.15 M

0.40/0.70

0.05/0.35

0.05

EN32B

0.10/0.18

0.60/1.00

0.05/0.35

0.07

0.05

EN32C

0.10/0.18

0.60/1.00

0.05/0.35

0.05

EN32M

0.10/0.18

0.60/1.00

0.05/0.35

0.10/0.15

0.05

EN33

0.10/0.15

0.30/0.60

0.10/0.35

0.30 M

2.75/3.50

0.05

EN34

0.14/0.20

0.30/0.60

0.10/0.35

1.50/2.00

0.20/0.30

0.05

EN35

0.20/0.28

0.30/0.60

0.10/0.35

1.50/2.00

0.20/0.30

0.05

EN35A

0.30/0.25

0.30/0.60

0.10/0.35

1.50/2.00

0.20/0.30

0.05

EN35B

0.23/0.28

0.30/0.60

0.10/0.35

1.50/2.00

0.20/0.30

0.05

EN36A

0.15 M

0.30/0.60

0.10/0.35

0.60/1.10

3.00/3.75

0.05

EN36B

0.12/0.18

0.30/0.60

0.10/0.35

0.60/1.10

3.00/3.75

0.05

EN36C

0.12/0.18

0.30/0.60

0.10/0.35

0.60/1.10

3.00/3.75

0.10/0.25

0.05

EN37

0.16 M

0.45 M

0.10/0.35

0.30 M

4.5/5.20

0.05

EN38

0.16 M

0.60 M

0.10/0.35

0.30 M

4.5/5.20

0.15/0.30

0.05

EN39A

0.12/0.18

0.50 M

0.10/0.35

1.00/1.40

3.80/4.50

0.05

EN39B

0.12/0.18

0.50 M

0.10/0.35

1.00/1.40

3.80/4.50

0.15/0.35

0.05

EN40A

0.10/0.20

0.40/0.65

0.10/0.35

2.90/3.50

0.40 M

0.40/0.70

0.05

EN40B

0.20/0.30

0.40/0.65

0.10/0.35

2.90/3.50

0.40 M

0.40/0.70

0.05

EN40C

0.30/0.50

0.40/0.80

0.10/0.35

2.50/3.50

0.40 M

0.70/1.20

0.05

EN41A

0.25/0.35

0.65 M

0.10/0.45

1.40/1.80

0.40 M

0.10/0.25

0.05

EN42

0.70/0.85

0.55/0.75

0.10/0.40

0.05

EN42B

0.60/0.70

0.55/0.80

0.35 M

0.05

EN42C

0.70/0.80

0.55/0.80

0.35 M

0.05

EN42D

0.80/0.90

0.55/0.80

0.35 M

0.05

EN42E

0.60/0.75

0.30/0.60

0.35 M

0.05

EN42F

0.60/0.75

0.60/0.90

0.35 M

0.05

EN42G

0.75/0.90

0.30/0.60

0.35 M

0.05

EN42J

0.75/0.90

0.60/0.90

0.35 M

0.05

EN43

0.45/0.55

0.70/1.00

0.05/0.35

0.06

EN43B

0.45/0.50

0.70/1.00

0.05/0.35

0.06

EN43C

0.50/0.55

0.70/1.00

0.05/0.35

0.06

EN43D

0.60/0.65

0.40/0.60

0.05/0.35

0.06

EN43E

0.65/0.70

0.70/0.90

0.05/0.35

0.06

EN43G

0.45/0.60

0.30/0.60

0.35 M

0.05

EN43J

0.45/0.60

0.60/0.90

0.35 M

0.05

EN44

0.90/1.20

0.40/0.70

0.30 M

0.05

EN44B

0.90/1.20

0.40/0.70

0.35 M

0.05

EN44C

1.00/1.20

0.40/0.70

0.35 M

0.05

EN44D

0.90/1.05

0.30/0.70

0.35 M

0.05

EN44E

1.05/1.25

0.30/0.70

0.35 M

0.05

EN45

0.55/0.60

0.70/1.00

1.50/2.00

0.05

EN45A

0.55/0.65

0.70/1.00

1.70/2.00

0.05

EN46

0.35/0.45

0.70/1.00

1.50/2.00

0.05

EN48

0.45/0.55

0.50/0.80

0.10/0.50

1.00/1.40

0.05

EN48A

0.50/0.60

0.60/0.90

1.35/1.65

0.55/0.85

0.05

EN49A

0.40/0.85

1.00 M

0.30 M

0.05

EN49B

0.45/0.85

1.00 M

0.30 M

0.05

EN49C

0.55/0.85

0.75 M

0.30 M

0.04

EN49D

0.65/0.85

0.75 M

0.30 M

0.04

EN50

0.40/0.50

0.50/0.70

0.10/0.35

1.00/1.50

0.04

EN51

0.25/0.35

0.35/0.75

0.10/0.35

0.30 M

2.75/3.25

0.05

EN52

0.40/0.50

0.30/0.60

3.00/3.75

7.50/9.50

0.50 M

0.04

EN53

0.55/0.65

0.30/0.60

1.40/1.70

5.75/6.75

0.50 M

0.05

EN54

0.35/0.50

1.50 M

1.00/2.509

12.0/16.0

10.0 M

0.04

EN54A

0.37/0.47

0.50/0.80

1.00/2.00

13.0/15.0

0.40/0.60

0.04

EN55

0.18/0.45

1.00 MAX

1.00/2.50

17.0 Min

6.0/12.0

0.04

EN56A

0.12 M

1.00M

1.00 M

12.0/14.0

1.00 M

0.04

EN56B

0.12/0.18

1.00 M

12.0/14.0

1.00 M

0.04

EN56C

0.18/0.25

1.00 M

12.0/14.0

1.00 M

0.04

EN56D

0.25/0.35

1.00 M

12.0/14.0

1.00 M

0.04

EN56AM

0.12 M

1.50 M

1.00 M

12.0/14.0

1.00 M

0.75

0.04

EN56BM

0.12/0.18

1.50 M

1.00 M

12.0/14.0

1.00 M

0.75

0.04

EN56CM

0.18/0.25

1.50 M

1.00 M

12.0/14.0

1.00 M

0.75

0.04

EN56DM

0.25/0.35

1.50 M

1.00 M

12.0/14.0

1.00 M

0.75

0.04

EN57

0.25 M

1.00 M

0.10/1.00

15.5/20.0

1.0/3.0

0.04

EN58A

0.16 M

2.00 M

0.20 min

17.0/20.0

7.0/10.0

0.04

EN58B

0.15 M

2.00 M

0.20 min

17.0/20.0

7.0/10.0

0.04

EN58C

0.15 M

2.00 M

0.20 min

17.0/20.0

9.0/12.0

0.04

EN58D

0.16 M

2.00 M

0.20 M

11.0/14.0

0.04

EN58E

0.08M

2.00 M

0.20 M

17.5/20.0

8.0/11.0

0.04

EN58F

0.15 M

2.00 M

0.20 M

17.0/20.0

7.0/10.0

0.04

EN58G

0.15 M

2.00 M

0.20 M

17.0/20.0

9.0/12.0

0.04

EN58H

0.12 M

2.00 M

0.20 M

17.0/20.0

8.0/12.0

1.50/2.50

0.04

EN58J

0.12 M

2.00 M

0.20 M

17.0/20.0

8.0/12.0

2.50/3.50

0.04

EN59

0.74/0.84

0.20/0.60

1.75/2.25

19.0/20.5

1.15/1.65

0.03

EN60

0.12 M

1.00 M

16.0/18.0

0.50 M

0.04

EN61

0.12 M

1.00 M

20.0/22.0

0.50 M

0.04

EN100

0.35/0.45

1.20/1.50

0.50 M

0.30/0.60

0.50/1.00

0.15/0.25

0.05

EN100A

0.25/0.35

1.20/1.50

0.10/0.50

0.30/0.60

0.50/1.00

0.15/0.25

0.05

EN100B

0.30/0.35

1.20/1.50

0.10/0.50

0.30/0.60

0.50/1.00

0.15/0.25

0.05

EN100C

0.35/0.40

1.20/1.50

0.10/0.50

0.30/0.60

0.50/1.00

0.15/0.25

0.05

EN100D

0.40/0.45

1.20/1.50

0.10/0.50

0.30/0.60

0.50/1.00

0.15/0.25

0.05

EN100E

0.25/0.35

1.20/1.50

0.50 M

0.30/0.60

0.50/1.00

0.15/0.25

0.05

EN110

0.35/0.45

0.40/0.80

0.10/0.35

0.90/1.40

1.20/1.60

0.10/0.20

0.05

EN111

0.30/0.40

0.60/0.90

0.10/0.35

0.45/0.75

1.00/1.50

0.05

EN111A

0.33/0.38

0.60/0.90

0.10/0.35

0.45/0.75

1.00/1.50

0.05

EN160

0.35/0.45

0.30/0.60

0.10/0.35

1.50/2.00

0.20/0.35

0.05

EN160A

0.38/0.43

0.30/0.60

0.10/0.35

1.50/2.00

0.20/0.35

0.05

EN201

0.18 M

1.10/1.50

0.05/0.35

0.05

EN202

0.18 M

1.20/1.50

0.05/0.35

0.10/0.18

0.05

EN206

0.12/0.17

0.30/0.50

0.10/0.35

0.30/0.50

0.05

EN207

0.16/0.21

0.60/0.80

0.10/0.35

0.60/0.80

0.05

EN325

0.22 M

0.45/0.65

0.10/0.35

0.40/0.60

1.50/2.0

0.20/0.30

0.05

EN351

0.20 M

0.60/1.00

0.35 M

0.40/0.80

0.60/1.00

0.10 M

0.05

EN352

0.20 M

0.50/1.00

0.35 M

0.60/1.00

0.85/1.25

0.10 M

0.05

EN353

0.20 M

0.50/1.00

0.35 M

0.75/1.25

1.00/1.50

0.08/0.15

0.05

EN354

0.20 M

0.50/1.00

0.35 M

0.75/1.25

1.50/2.00

0.10/0.20

0.05

EN355

0.20 M

0.40/0.70

0.35 M

1.40/1.70

1.80/2.20

0.10/0.25

0.05

EN361

0.13/0.17

0.70/1.00

0.35 M

0.55/0.80

0.40/0.70

0.08/0.15

0.05

EN362

0.18/0.23

0.70/1.00

0.35 M

0.55/0.80

0.40/0.70

0.08/0.15

0.05

EN363

0.22/0.26

0.70/1.00

0.35 M

0.55/0.80

0.40/0.70

0.08/0.15

0.05

Important Notes:
1) BS 970 has been generally superseded by European based standards Notes on European Standards
2) All information on this page has been interpreted from the relevent Standard, Books eg Newnes Mech. Eng Pocket Book, Kempe’s, Other Web Sites, and Leaflets. This information is of a general nature for initial guidance. Selection of materials for use must be by communication with the suppliers and by reference to the appropriate codes – The best standards to use are the European EN based standards

Basic Steel Selection Based on BS 970

Typical selection of steels and useful notes

STEEL	Notes
Carbon Steel
BS 970 230M07 (EN1A)	A low carbon, free cutting, mild steel suitable for machining using automatic and CNC machines. Available as rolled or normalised in round, flat or hexagon form
BS 970 070M20 (EN3A)	A mild steel used for general purposes. Suitable for lightly stressed fasteners ,shafts etc. Can be easily machined and welded. Available hot rolled, normalised, cold drawn or turned. Supplied in Black round or square , bright round square, flat and hexagon.
BS 970 080M30 (EN5/EN6)	A medium strength steel. Used to make, shafts, racks, pinions, studs, bolts, nuts, rollers, etc. Supplied as square bar, or round bar or flat.
BS 970 080M40 (EN8)	A medium strength steel. Suitable for stressed pins, shafts studs, keys etc. Available as rolled or normalised. Supplied as square bar, or round bar or flat.
BS 970 070M55 (EN9)	A hard wearing medium carbon steel which can be hardened. Available as hot rolled, normalised, Cold drawn or turned. Sections available black round, black square, bright round and black flat.
BS 970 080M15 (EN32)	A case hardening mild steel suitable for general engineering applications. When case hardened results in a hard surface with a tough core. Used for making gears cams and rollers etc. Supplied as black round bar and sections
Alloy Steel
BS 970 605M36 (EN16)	A manganese molydenum steel with good ductily and mechanical strength. Available in heat treated condition e.g (R,S,T).Supplied as black round or square bar and bright round or square, and hexagons.
BS 970 709M40 (EN19)	A 1% typical chromium molybdenum steel with higher molybdenum. Can be induction hardened. Used for gears, and high strength shafts etc. Suitable for higher strength applications when resistance to shock is required. Available annealed. Supplied as black round or square bar and bright round or square, and hexagons.
BS 970 817M40 (EN24)	A nickel chromium molybdenum steel with high strength and toughness. Used for gears axles and high strength studs. Supplied as rolled, annealed and hardened and tempered. Supplied as black round or square bar and bright round or square, and hexagons
BS 970 655M13 (EN36)	A high quality nickel chromium case hardening steel. Can be hardened to provide hard surface with a strong tough core. Used for high duty gears and shafts. Supplied in as-rolled condition in black square and round bar and bright round.
BS 970 722M24 (EN40B)	A 3% chromium molybdenum nitriding steel. Provide good tough core strength with a hard nitrided surface for wear resistance. Supplied in as-rolled, annealed and hardened and tempered condition in black square and round bar.
Stainless Steel
BS970 416S21 (EN56)	Martensitic (Magnetic), can be hardened and tempered to give improved tensile strength. FM** grade. Typical applications include cutlery, surgical instruments, fasteners, valves, spindles and shafts.
BS 970 431S29 (EN57)	Martensitic (Magnetic). Supplied heat treated with a high tensile strength. Typical applications include cutlery, surgical instruments, fasteners, valves, spindles and shafts.
BS 970 430S15 typ (EN60)	Ferritic. Low Strength but good ductility. Used food processing and catering equipment and automotive trim,car exhaust systems etc.
BS 970 Grade 304S15 (EN58-)	Austenitic (Non-Magnetic)Cannot be heat treated but work hardens. Readily formed and welded,used mainly in domestic, dairy and decorative appliances general purpose grade for corrosion resistant applications. This grade is the most widely used of all stainless steels. Its chemical composition,provide the best all-round performance S.S. at relatively low cost. It has excellent low temperature properties. Lower Carbon grades (S15 and less) have improved weldability.
BS 970 Grade 316S16 (EN58J)	Austenitic (Non-Magnetic)Cannot be heat treated but work hardens. It offers high resistance to corrosion. Generally machined components and pipe fittings. This grade is almost as popular as the 304 grade the increased Mo content makes the steel more suitable for resisting pitting and crevice then 304 Grade. Lower Carbon grades (S15 and less) have improved weldability.
BS 970 Grade 321S12 (EN58B-C)	Austenitic (Non-Magnetic)Cannot be heat treated but work hardens. Titanium stabilized, which offers improved welding properties.
BS 970 Grade 310S31	Austenitic (Non-Magnetic). Pocesses good resistance to scaling at high temperatures. For continuous high temperature service in the range 850 – 1000oC.

Sample Steels Specifications

Typical steels with general specifications notes

Important Note:

The values below are not comprehensive and must be used with extreme care.
The strength values e.g. the proof stress and yield stress, reduce as the section increases. In the tables below the relevant sections are often thin and so the strength values are maximum values. Please refer to the relevant standards for important work..

Type Of Steel	BS Spec BS 970	Composition % C-Mn-Ni-Cr-Mo	Condition	Yield Stress x 106 Pa	Tensile Stress MPa	Elongation %
Low Carbon Steel	230M07	0,15C% 1,1%Mn	Hot rolled	215	360	21
Low Carbon Steel	230M07	0,15C% 1,1%Mn	HR -> CD (thin)	340	480	6

Low Carbon Steel	070M20	0,2C% 0,7%Mn	Normalised	215	430	21
Low Carbon Steel	070M20	0,2C% 0,7%Mn	HR->CD (thin)	440	560	10
Constructural Steel	080M40	0,4%C 0,8%Mn	Normalised	280	550	16
Constructural Steel	080M40	0,4%C 0,8%Mn	HR -> CD (thin)	530	660	7
Low Manganese	150M28	0,28%C 1,5%Mn	Heat Treat(P)	355	587	20
Nickel Manganese	503M40	0,4%C -0,9%Mn 1,0%Cr	Heat Treat(R)	525	700 min	17
Manganese Molybdenum	608M38	0,38%C 1,5%Mn 0,5%Mo	Heat Treat	1000	1130	19
Nickel Chromium	633M31	0,31%C 0,60%Mn 3,0%Ni 1,0%Cr	Heat Treat(U)	755	927	23
Nickel-Chrom-Mo	817M40	0,4%C 0,55%Mn 1,2%Cr 0,3%Mo	Heat Treat (W)	940	1075	11
Nickel-Chrom-Mo	835M30	0,3%C 0,55%Mn 4,25%Ni 1,25%Cr 0,3%Mo	Hard’n +Temp	1470	1700	14
Mang-Ni-Chr-Mo	945M38	0,38%C 1,4%Mn 0,75%Ni 0,5%Cr 0,20%Mo	Heat Treat (V)	850	1040	2
Steel Ferritic	403S17	0,08%C 1,0%Mn 13%Cr 0,5%Ni	Softened	280	420	20
Stainless Martensitic	420S45	0,3%C 0,5%Mn 13,0%Cr	Heat Treat (R)	525	700	15
18/8 Stainless Austenitic	302S25	0,12%C 0,8%Mn 8,5%Ni 18,0%Cr	Softened	278	618	50
18/8 Stainless Austenitic	302S25	0,12%C 0,8%MN 8,5%Ni 18,0%Cr	Cold work	803	896	30
18/8 St. (No Weld Decay)	321S20	0,05%C 0,8%Mn 8,5%Ni 18,0%Cr 1,6Ti	Softened	278	649	45
18/8 St. (No Weld Decay)	321S20	0,05C 0,8%Mn 8,5%Ni 18,0%Cr 1,6Ti	Cold Worked	402	803	30

BS970 Numbering system explained

The BS970 code number is constructed as follows;

a) The first three symbols are a number code indicating the type of steel:

000 to 199 Carbon and carbon-manganese steels. The number represents the manganese content x 100

200 to 240 Free cutting steels. The second and third number indicate the sulphur content x 100

250 Silicon Manganese valve steels

300 to 499 Stainless and heat resisting steels

500 to 999 Alloy Steels

b) The fourth symbol is a letter code .

A The steel is supplied to a chemical compostion determine by analysis of the batch sample.

H The steel is supplied to a hardenability specification

M The steel is supplied to a Mechanical Property specification.

S The steel is a stainless steel

c) The fifth and sixth symbol is a number is the actual mean carbon content x 100

In addition to the above coding a condition coding may be applied. indicating the tensile strength range after heat treatment. This is used in conjunction with a limiting section designation. (See table below)

Condition Code Letter	Tensile Strength (Mpa)
Condition Code Letter	Min	Max
P	550	700
Q	620	770
R	700	850
S	770	930
T	850	1000
U	930	1080
V	1000	1150
W	1080	1240
X	1150	1300
Y	1240	1400
Z	1540	–

Table of BS 970: 1955 EN equivalents
* Steel No Relate to European Numbering system BS EN 10027-2 – I will add numbers as I locate them

BS970 1955 EN steel Equivalent

EN No	BS 970 Name	Note.	* Steel No
1A	230M07	Low Carbon Free Cutting C	1.0715
1B	240M07	Low Carbon Free Cutting C	–
3A	070M20	’20’ C	1.0402
5	080M30	’30’ C	1.1178/1.1179
5A	080A27	’30’ C
5B	080A30	’30’ C	1.0528
8	080M40	’40’C	1.0503/1.0511
8A	080A35	’35’C
8B	080A37	’37’C
8C	080A40	’40’C	1.1186
8D	080A42	’42’C
9	070M55	’50’C	1.1209/1.0535
43A	080A50	’50’C	1,1206
43B	080A47	’47’C
43C	080A52	’52’C
43D	080A62	’62’C	1.1221
43E	080A67	’67’C
1A	220M07	Low Carbon FC**
1B	240M07	Low Carbon FC**
8M	212M36	’36’ C FC**	1.0726
15AM	216M36	’36’ C’ FC**
8BM	212A37	’37’ C FC**
8DM	212M44	’42’ C FC**	?1.0727
8M	212M44	’44’ C FC**
12	503M40	1% Ni
12B	503A37	1% Ni
12C	503A42	1% Ni
11	526M60	1% Cr
18	530M40	1% Cr	1.7035
18A	530A30	1% Cr	1.8401
18B	530A32	1% Cr	1.7033
18C	530A36	1% Cr
18D	530A40	1% Cr	1.7035
31	534A99	1.5% Cr
31	535A99	1.5% Cr
16D	605M30	1.5% Mn/Mo (Water Hardening)
16	605M36	1.0% Mn/Mo	1.7006
16B	605A32	1.0% Mn/Mo
16C	605A37	1.0% Mn/Mo	1.5432
16M	605A32	1.5% Mn/Mo(FC**)
111	640M40	1.25% Ni/Cr
111A	640M40	1.25% Ni/Cr
23	653M31	3.0% Ni/Cr
19A	708M40	1.0% Cr/Mo	1.7223
19B	708A37	1.0% Cr/Mo	1.7220
19C	708A42	1.0% Cr/Mo
19	709M40	1.0% Cr/Mo (Higher Mo)	1.7225
40B	722M24	3.0% Cr/Mo (Nitriding)	1.7361
13	785M19	1.5% Mn/Ni/Mo
110	816M40	1.0% Ni/Cr/Mo (Low Mo)	1.6582
24	817M40	1.0% Ni/Cr/Mo	1.6582/1.6565
25	826M31	2.5% Ni/Cr/Mo (Medium C)
26	826M40	2.5% Ni/Cr/Mo (High C)	1,6746
27	830M31	3.0% Ni/Cr/Mo
30B	835M30	4.0% Ni/Cr/Mo	1.6747
40C	897M39	3.25% Ni/Cr/Mo/Va (Nitriding)
41A	905M31	1.5% Cr/Al/Mo (Nitriding)(Medium C)	1.8509
41B	905M39	1.5% Cr/Al/Mo (Nitriding)(High C)
100	945M38	1.5% Mn/Ni/Cr/Al/Mo
100C	945A40	1.5% Mn/Ni/Cr/Al/Mo	1.6546
351	635M15	0.75% Ni/Cr
352	637M14	1.0% Ni/Cr
36A	655M13	3.25% Ni/Cr	1.5752
36A	655M13	3.25% Ni/Cr	1.5752

BS970 1955 EN steel Equivalent

EN No	BS 970 Name	Note.	*Steel No
39A	659M15	4.0% Ni/Cr
34	665M17
35A	665A22	1.5% Ni/Mo
35	665M23	1.5% Ni/Mo
35B	665A24	1.5% Ni/Mo
361	805M17	0.5% Ni/Cr/Mo
362	805M20	0.5% Ni/Cr/Mo
363	805M25	0.5% Ni/Cr/Mo
353	815M27	1.5% Ni/Cr/Mo
354	820M27	1.75% Ni/Cr/Mo
355	822M17	2.0% Ni/Cr/Mo
36C	832M13	3.0% Ni/Cr/Mo	1.6657
351	635M15	0.75% Ni/Cr
352	637M17	1% Ni/Cr
36A	655M13	3.25% Ni/Cr
39A	659M15	4.0% Ni/Cr
34	665M17	1.75% Ni/Mo
35	665M23	1.75% Ni/Mo
361	805M17	0.5% Ni/Cr/Mo
362	805M20	0.5% Ni/Cr/Mo	1.6522’3
363	805M25	0.5% Ni/Cr/Mo
353	815M17	1.5% Ni/Cr/Mo
354	820M17	1.75% Ni/Cr/Mo
355	822M17	2.0% Ni/Cr/Mo
36C	832M13	3.5% Ni/Cr/Mo	1.6657
39B	835M15	4.0% Ni/Cr/Mo
43	080A22	’52’Carbon
43E	080A67	’67’Carbon
42	070A72	’52’Carbon
44	060A96	’96’Carbon	1.1274
45	250A53	Silico-Manganese ’53’Carbon	1.0904
45A	250A58	’58’Carbon
45A	250A61	’61’Carbon
47	735A50	1.0% Cr	1.8159
48	527A60	0.75% Cr/Va
Stainless Steels
58A	302S25	CrNi 18/9 C 0,12 ..Aust	1.4828
58M	303S41	CrNi 18/9 S bearing FM**..Aust
58E	304S15	CrNi 18/19 C 0,06 ..Aust	1.4301
58H	315S16	CrNiMo 17/10/1,5 C 0,07 ..Aust
58J	316S16	CrNiMo 17/11/2,5 C 0,07 ..Aust	1.4401
58J	316S17	CrNiMo 17/12/2,5 +Ti C 0,08 ..Aust	1.4401
58B/58C	321S12	CrNi 18/9 +Ti C 0,08 ..Aust	1.4541
58B/58C	321S20	CrNi 18/9 +Ti C 0,12 ..Aust
58M	325S21	CrNi 18/9 +Ti +S FM** ..Aust	1.4305
54	331S40	NiCrW 14/14/2,5..Valve
54A	331S42	NiCrW 14/14/2,5 + Mo ..Valve
58F/58G	347S17	Cr/Ni 18/9/Nb/C 0,08 ..Aus	1.4550
52	401S45	Si/Cr 3/8 ..Valve
56A	410S21	13CrC0,12 Mart	1.4006
56AM	416S21	13Cr C 0,12 S FM** ..Mart	1.4005
56AM	416S41	13Cr C 0,12 Se FM** ..Mart
56BM	416S29	13Cr C 0,17 S FM** ..Mart
56C	416S37	13Cr C 0,24 S bearing FM** ..Mart
56B	420S29	13Cr C 0,17..Mart	1.4024
56C	420S37	13Cr C 0,24 ..Mart	1.4021
56D	420S45	13Cr C 0,32..Mart	1.4028
60	430S15	17Cr C 0,10….Fer	1.4016
57	431S29	17Cr 2,5NI C 0,10….Mart	1.4057
59	443S65	CrNiSi 20,1.5,2..Valve

Stainless Steels …Aus = Austenitic, Mart = Martensitic, Fe = Ferritic. FC** = Free Cutting..
FM** = Free machining

Inspection & Approval Certificates : EN10204 3.1 / DIN 50049 3.1 / ISO 10474 3.1 Mill Test Certificate, NACE MR-0175 / ISO 15156, NACE MR-01-03 / NACE MR-01-75 / ISO 15156, CE Marked, European Pressure Equipment Directive PED-97/23/EC, AD-2000-W0, ASME Boiler & Pressure Vessel Code Sec.II Part A Ed. 2008, with 3.2 certificate duly Certified & Approved by LRS (Lloyd’s Register), GL (Germanischer Lloyd), BV (Bureau Veritas), DNV (Det Norske Veritas), ABS (American Bureau of Shipping), SGS, TUV, RINA, IRS (Indian Register of Shipping), Class NK (Nippon Kaiji Kyokai), KR (Korean Register of Shipping), NORSOK Approved Standard M-630, M-650 Rev.3

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B 970 Fasteners

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Typical selection of steels and useful notes

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