Grade

C

Mn

P

S

Si

Cr

Mo

P5

0.15max

0.30-0.60

0.025

0.025

0.50 max

4.00-6.00

0.45-0.65

P9

0.15 max

0.30-0.60

0.025

0.025

0.25-1.00

8.00-10.00

0.90-1.10

P11

0.05-0.15

0.30-0.60

0.025

0.025

0.50-1.00

1.00-1.50

0.44-0.65

P22

0.05-0.15

0.30-0.60

0.025

0.025

0.50 max

1.90-2.60

0.87-1.13

P91

0.08-0.12

0.30-0.60

0.02

0.01

0.20-0.50

8.00-9.50

0.85-1.05

V 0.18-0.25

N 0.03-0.07

Ni 0.40 max

Al 0.02 max

Cb 0.06-0.10

Ti 0.01 max

Zr 0.01 max

Mechanical Properties

Grade

Tensile strength(MPa)

Yield strength(MPa)

Elongation(%)

Impact energy(J)

Hardness

P11

‰¥ 415

‰¥ 205

‰¥ 22

‰¥ 35

‰¤ 163HB

P12

‰¥ 415

‰¥ 220

‰¥ 22

‰¥ 35

‰¤ 163HB

P22

‰¥ 415

‰¥ 205

‰¥ 22

‰¥ 35

‰¤ 163HB

P5

‰¥ 415

‰¥ 205

‰¥ 22

‰¥ 35

‰¤ 187HB

P91

585~760

‰¥ 415

‰¥ 20

‰¥ 35

‰¤ 250HB

P92

‰¥ 620

‰¥ 440

‰¥ 20

‰¥ 35

250HB

NPS

OD Tolerance

NPS

WT Tolerance

1/8€³ ‰¤ NPS ‰¤ 1 1/2€³

+/- 0.4

1/8€³ ‰¤ NPS ‰¤ 2 1/2€³ , All T/D ratios.

+20%, -12.5%

1 1/2 < NPS ‰¤ 4€³

+/- 0.79

NPS ‰¥ 2 1/2€³ , T/D ‰¤ 5%

+22.5%, -12.5%

4€³ < NPS ‰¤ 8€³

+1.59, -0.79

NPS ‰¥ 2 1/2€³ , T/D > 5%

+15%, -12.5%

8€³ < NPS ‰¤ 12€³

+2.38, -0.79

(T= Specified Wall Thickness; D = Specified Outside DiaReliable Pipes and Tubes Ltd.er)

NPS > 12€³

+/- 1%