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Reg. 53 a
MATERIALS OF CONSTRUCTION

SEAMLESS FERRITIC PIPES FOR HIGH TEMPERATURE SERVICE

 Material

(i) The pipes shall be seamless and manufactured from steel produced by an open hearth or electric process or any of the Oxygen processes.  The steel shall be fully killed.

(ii)  The steel shall conform to the limits of chemical composition as given in table-4.

Table 4

CHEMICAL REQUIREMENTS FOR FERRITIC STEELS

  Grade

Chemical composition %

 

 

C

 

Mn

 

Si

 

S

 

P

 

Cr

 

Mo

 

V

 

Ni

Other

Elements

 

  P1

0.10

0.20

0.30

0.80

0.10

0.50

0.025

max

0.025

max

 

----

0.44

0.65

 

----

----

-----

  P2

0.10

0.20

0.30

0.61

0.10

0.30

0.025

max

0.025

max

0.50

0.81

0.44

0.65

----

----

-----

  P5

 

0.15

max

0.30

0.60

0.50

max

0.025

max

0.025

max

4.00

6.00

o.45

0.65

----

----

-----

  P9

0.15

max

0.30

0.60

0.25

1.00

0.025

max

0.025

max

8.00

10.0

0.90

1.10

----

----

-----

  P11

0.05

0.15

0.30

0.60

0.50

1.00

0.025

max

0.025

max

1.00

1.50

0.44

0.65

----

----

-----

  P12

0.05

0.15

0.30

0.61

0.50

max

0.025

max

0.025

max

0.80

1.25

0.44

0.65

----

----

-----

  P22

0.05

0.15

0.30

0.60

0.50

max

0.025

max

0.025

max

1.90

2.60

0.87

1.13

----

----

-----

  P91

0.08

0.12

0.30

0.60

0.20

0.50

0.010

max

0.020

max

8.00

9.50

0.85

1.05

0.18

0.25

----

Nb=0.06 - 0.10

N=0.030 - 0.70

Ni=0.40 max

Al=0.04 max

  X20Cr

  MoV121

0.17

0.23

1.00

max

0.50

max

0.03

max

0.030

max

10.0

12.5

0.80

1.20

0.25

0.35

0.30

0.80

----

 
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