Oil cracking tube

10 #
20#

12CrMo

1Cr5Mo

1Cr19Ni11Nb

15CrMo

GB9948-2006

∮8-630*1-60

Apply to oil refinery furnace tube and heat exchanger

C

Si

Mn

Ni

Cr

Mo

P.S

GB9948

10

0.17 ～ 0.14

0.17 ～ 0.37

0.35 ～ 0.65

≤ 0.25

≤ 0.15

/

≤ 0.035

20

0.17 ～ 0.24

0.17 ～ 0.37

0.35 ～ 0.65

≤ 0.25

≤ 0.25

/

≤ 0.035

12CrMo

0.08 ～ 0.15

0.17 ～ 0.37

0.40 ～ 0.70

≤ 0.30

0.40 ～ 0.70

0.40 ～ 0.55

≤ 0.035

15CrMo

0.12 ～ 0.18

0.17 ～ 0.37

0.40～ 0.70

≤ 0.30

0.80 ～ 1.10

0.40 ～ 0.55

≤ 0.035

Mechanical property

Tensile strength (MPa)

Yield strength (MPa)

Elongation(%)

10

330 ～ 490

≥ 205

≥ 24

20

410 ～ 550

≥ 245

≥ 21

12CrMo

410 ～ 560

≥ 205

≥ 21

15CrMo

440 ～ 640

≥ 235

≥ 21

Common grade

Senior grade

WH

Hot rolled (extruded) steel pipe

OD(D)

≤50

+0.50

+0.30

>50~159

+1%D

+0.75%D

>159

+1%D

+0.9%D

TH(S)

>20

+12.5%S
-10%S

+10%S

Hot expanded steel pipe

OD(D)

All size

+1%D

TH(S)

All size

+15%S

WC

Cold drawn (rolled) steel pipe

OD(D)

14~30

+0.20

+0.30

>30~50

+0.30

+0.30

>50

+0.75%D

+0.30

TH(S)

>3.0

+12.5%S
-10%S

+10%S

>3.0

+10%S

+7.5%S