Standard

Grade

Steel grade

Chemical composition, %

API 5L

C

Mn

P

S

Si

V

Nb

Ti

CEpcm

PSL 1

B or L245

≤0.28

≤1.20

≤0.030

≤0.030

-

-

-

-

-

x42 or L290

≤0.28

≤1.30

≤0.030

≤0.030

-

-

-

-

-

X46 or L320

≤0.28

≤1.40

≤0.030

≤0.030

-

-

-

-

-

X52 or L360

≤0.28

≤1.40

≤0.030

≤0.030

-

-

-

-

-

X56 or L390

≤0.28

≤1.40

≤0.030

≤0.030

-

-

-

-

-

X60 or L415

≤0.28

≤1.40

≤0.030

≤0.030

-

-

-

-

-

X70

≤0.28

≤1.40

≤0.030

≤0.030

-

-

-

-

-

PSL 2

BR or L245R

≤0.24

≤1.20

≤0.025

≤0.015

≤0.40

c

c

≤0.04

≤0.25

X42R or L290R

≤0.24

≤1.20

≤0.025

≤0.015

≤0.40

≤0.06

≤0.05

≤0.04

≤0.25

BN or L245N

≤0.24

≤1.20

≤0.025

≤0.015

≤0.40

c

c

≤0.04

≤0.25

X42N or L290N

≤0.24

≤1.30

≤0.025

≤0.015

≤0.40

≤0.06

≤0.05

≤0.04

≤0.25

X46N or L320N

≤0.24

≤1.40

≤0.025

≤0.015

≤0.40

≤0.07

≤0.05

≤0.04

≤0.25

X52N or L360N

≤0.24

≤1.40

≤0.025

≤0.015

≤0.45

≤0.10

≤0.05

≤0.04

≤0.25

X56N or L390N

≤0.24

≤1.40

≤0.025

≤0.015

≤0.45

≤0.10

≤0.05

≤0.04

≤0.25

X60N or L415N

≤0.24

≤