Special Alloy & Tools Steel

Carbon Constructional Steels

Nominal Chemistry
Equivalent Specification

IS : 1570/1961 Designation

ASP Designation

C
Mn
Si

BS : 970 Designation

SAE Designation

DIN Designation

GOST Designation

C - 35

C - 35

35

75

25

En - 8

1035

CK - 35

-

C - 40

C - 40

40

75

25

-

1040, 1038

-

40

C - 45

C - 45

45

75

25

En - 9

1042, 1045, 1046

CK - 45

45

C - 55 Mn 75

C - 55

55

75

25

En - 43C

1055

-

55

Note : S & P limits will be guided by relevant specifications.

Specification No.

Materials

Chemical Composition per cent
C
Si
Mn
S
P Max

BS-970/55

Wrought Steel-Bars, Billets and forgings

En-1A

Free Cutting Steel for machining

0.07-0.15

0.10 max

0.80-1.20

0.20-0.30

0.07

En-1B

Free Cutting Steel Bars for machining

0.07-0.15

0.10 max

1.00-1.40

0.30-0.60

0.06

EN-2

General purpose cold forming steel

0.20 max

-

0.80 max

0.06 max

0.06

EN-2A

Special purpose cold forming steel

0.12 max

-

0.50 max

0.05 max

0.05

EN-2A/1

" "

0.10 max

-

0.50 max

0.04 max

0.04

EN-2B

" "

0.15 max

-

0.50 max

0.05 max

0.05

EN-5

Carbon Steel

2.25-0.35

0.05-0.35

0.60-1.00

0.06 max

0.06

EN-8

Carbon Steel

0.35-0.45

0.05-0.35

0.60-1.00

0.06 max

0.06

EN-8M

Carbon Steel-Free Cutting

0.35-0.45

0.25 max

0.90-1.30

0.12-0.20

0.06

EN-9

Carbon steel

0.50-0.60

0.05-0.35

0.05-0.80

0.06 max

0.06

EN-32A

Carbon case-hardening steel

0.15 max

0.05-0.35

0.40-0.70

0.05 max

0.05

EN-32B

" "

0.10-0.18

0.05-0.35

0.60-1.00

0.07 max

0.05

EN-32C

" "

0.10-0.18

0.05-0.35

0.60-1.00

0.05 max

0.05

EN-45

Silicon-Manganese Spring Steel

0.05-0.60

1.50-2.00

0.70-1.00

0.05 max

0.05

EN-45A

" "

0.55-0.63

1.70-2.00

0.70-1.00

0.05 max

0.05

 

Specification No.

Materials
Chemical Composition per cent
Mechanical Properties

C
Max
Mn
Max
S
Max
P
Max

Tensile
Strength
kgf/mm2
Min

Yield

Stress

kgf/mm2

Elongation

per cent

min*

BS-1449/64

Part-2A Carbon steel plates rolled by the non-continuous process

EN-2

Commercial Quality

0.2

0.9

0.06

0.06

+

-

-

EN-2A

Deep Drawing Quality

0.12

0.5

0.05

0.05

31.5

-

23

EN-2A/1

Extra Deep Drawing Quality

0.1

0.5

0.04

0.04

29.9

-

26

EN-2B

Flaging Quality

0.15

0.5

0.05

0.05

31.5

-

22

Part-2B Carbon steel sheets rolled by the non-continuous process

EN-2

Commercial Quality

0.2

-

-

-

+

-

-

EN-2A

Deep Drawing Quality

0.12

0.5

0.05

0.05

+

-

-

EN-2A/1

Extra Deep Drawing Quality

0.1

0.5

0.04

0.04

+

-

-

EN-2B

Cold Forming Quality

0.15

0.6

0.05

0.05

31.5

-

20.5

'+' : No tensile properties are specified but for design purposes the tensile strength can be assumed to be of the order of 20 tons/inch2

* : Gauge length Lo = 8 inch