Chemical Composition for PSL 1 pipe with t ≤ 0.984”

Steel Grade

Mass fraction, based on heat and product analyses^a
%

C

Mn

P

S

V

Nb

Ti

max ^b

max ^b

max.

max.

max.

max.

max.

B

0.28

1.2

0.03

0.03

c,d

c,d

d

X42

0.28

1.3

0.03

0.03

d

d

d

X46

0.28

1.4

0.03

0.03

d

d

d

X52

0.28

1.4

0.03

0.03

d

d

d

X56

0.28

1.4

0.03

0.03

d

d

d

X60

0.28 ^e

1.40 ^e

0.03

0.03

f

f

f

X65

0.28 ^e

1.40 ^e

0.03

0.03

f

f

f

X70

0.28 ^e

1.40 ^e

0.03

0.03

f

f

f

a 0.50% maximum for copper; 0.50% maximum for nickel; 0.5% maximum for chromium; and 0.15% maximum for molybdenum. For grades up to and including X52, Cu, Cr and Ni shall not be added intentionally.

b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum concentration for manganese is permissible, up to a maximum of 1.65% for grades ≥B, but ≤X52; up to a maximum of 1.75% for grades＞X52, but ＜X70; and up to a maximum of 2.00% for grade X70.

c. Unless otherwise agreed, the sum of the niobium and vanadium contents shall be ≤0.06%

d. The sum of the niobium, vanadium and titanium concentrations shall be ≤0.15%

e. unless otherwise agreed.

f. unless otherwise agreed, the sum of the niobium, vanadium and titanium concentrations shall be ≤0.15%

Chemical Composition for PSL 2 pipe with t ≤ 0.984”

Steel Grade

Mass fraction, % based on heat and product analyses

Carbon Equiv ^a %

C ^b

Si

Mn ^b

P

S

V

Nb

Ti

Other

CE _IIW

CE _Pcm

max

max

max

max

max

max

max

max

max

max

BR

0.24

0.4

1.2

0.025

0.015

c

c

0.04

e

0.43

0.25

X42R

0.24

0.4

1.2

0.025

0.015

0.06

0.05

0.04

e

0.43

0.25

BN

0.24

0.4

1.2

0.025

0.015

c

c

0.04

e

0.43

0.25

X42N

0.24

0.4

1.2

0.025

0.015

0.06

0.05

0.04

e

0.43

0.25

X46N

0.24

0.4

1.4

0.025

0.015

0.07

0.05

0.04

d,e

0.43

0.25

X52N

0.24

0.45

1.4

0.025

0.015

0.10

0.05

0.04

d,e

0.43

0.25

X56N

0.24

0.45

1.4

0.025

0.015

0.10^f

0.05

0.04

d,e

0.43

0.25

X60N

0.24^f

0.45^f

1.40^f

0.025

0.015

0.10^f

0.05^f

0.04^f

g,h

As agreed

BQ

0.18

0.45

1.4

0.025

0.015

0.05

0.05

0.04

e

0.43

0.25

X42Q

0.18

0.45

1.4

0.025

0.015

0.05

0.05

0.04

e

0.43

0.25

X46Q

0.18

0.45

1.4

0.025

0.015

0.05

0.05

0.04

e

0.43

0.25

X52Q

0.18

0.45

1.5

0.025

0.015

0.05

0.05

0.04

e

0.43

0.25

X56Q

0.18

0.45f

1.5

0.025

0.015

0.07

0.05

0.04

d,e

0.43

0.25

X60Q

0.18^f

0.45^f

1.70^f

0.025

0.015

g

g

g

h

0.43

0.25

X65Q

0.18^f

0.45^f

1.70^f

0.025

0.015

g

g

g

h

0.43

0.25

X70Q

0.18^f

0.45^f

1.80^f

0.025

0.015

g

g

g

h

0.43

0.25

X80Q

0.18^f

0.45^f

1.90^f

0.025

0.015

g

g

g

i,j

As agreed

a Based upon product analysis, for seamless pipe with t＞20.0mm (0.787in), the carbon equivalent limits shall be as agreed. The CE _IIW limits apply if the carbon mass fraction is greater than 0.12% and the CE _Pcm limits apply if the carbon mass fraction is less than or equal to 0.12%.

b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum for manganese is permissible, up to a maximum of 1.65% for grades ≥B, but ≤X52; up to a maximum of 1.75% for grades＞X52, but ＜X70; and up to a maxiumum of 2.00% for grade ≥X70, but ≤X80; and up to a maxium of 2.20% for grades ＞X80.

c. Unless otherwise agreed, the sum of the niobium and vanadium concentrations shall be ≤0.06%

d. The sum of the niobium, vanadium and titianium concentrations shall be ≤0.15%

e. unless otherwise agreed, 0.50% maximum for copper, 0.30% maximum for nickel, 0.30% maximum for chromium and 0.15% maximum for molybdenum.