Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

Petroleum cracking pipe


Petroleum cracking

 Uses: used in petroleum refinery furnace tubes heat exchangers and pipe seamless pipe

Main steel grade grades: 10, 20, 12CrMo, 15CrMo (after consultation, but also supply other special grades of steel)

Petroleum cracking pipe

Chemical composition, mechanical properties:

Standard

Steel grade

Chemical composition (%)

C

Si

Mn

Ni

Cr

Mo

PS

GB9948

10 

0.17 to 0.14

0.17 to 0.37

0.35 to 0.65

≤ 0.25

≤ 0.15

/

≤ 0.035

20 

0.17 to 0.24

0.17 to 0.37

0.35 to 0.65

≤ 0.25

≤ 0.25

/

≤ 0.035

12CrMo

0.08 ~ 0.15

0.17 to 0.37

0.40 to 0.70

≤ 0.30

0.40 to 0.70

0.40 to 0.55

≤ 0.035

15CrMo

0.12 ~ 0.18

0.17 to 0.37

0.40 to 0.70

≤ 0.30

0.80 to 1.10

0.40 to 0.55

≤ 0.035

Mechanical behavior

Tensile strength (MPa)

Yield strength (MPa)

Elongation (%)

10

330 to 490

≥ 205

≥ 24

20

410 to 550

≥ 245

≥ 21

12CrMo

410 ~ 560

≥ 205

≥ 21

15CrMo

440 to 640

≥ 235

≥ 21

Tolerance:

Classification Code

Manufacturing methods

Nominal pipe size

Tolerance

Ordinary Level

Advanced

WH

Hot-rolled    (extrusion) Pipe

Diameter (D)

≤ 50

+ .50

+ .30

> 50 to 159

+ 1% D

+ 0.75% D

> 159

+ 1% D

+ 0.9% D

Thickness (S)

> 20

+12.5% ​​S

-10% S

+ 10% S

Thermal expansion pipe

Diameter (D)

Entire

+ 1% D

Thickness (S)

Entire

+ 15% S

WC

Cold drawn (rolled) steel

Diameter (D)

14 to 30

+ .20

+ .30

> 30 to 50

+ .30

+ .30

> 50

+ 0.75% D

+ .30

Thickness (S)

> 3.0

+12.5% ​​S

-10% S

+ 10% S

> 3.0

+ 10% S

+ 7.5% S

Petroleum cracking pipe

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