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Reg. 244
a, Reg. 244 b, Reg. 245
TUBES, PIPES IN BOILERS, HEADERS AND STEEL CASTINGS

Tubes

(a) Tubes shall be of cold drawn weldless or hot finished weldless or electric-resistance-welded steel and shall comply with regulations 36, to  63.



Pipes

(b) Pipes forming an integral part of the boiler unit shall comply with the provisions of Chapter VIII.

Tests on butt welds on pipes shall be required under Regulation 151 (h).



Reg. 245

Headers

Headers and similar pressure parts shall be of forged steel, seamless steel pipes or of cast steel and shall comply with the relevant provisions of Chapter II, in all other respects excepting the chemical composition tensile strength and elongation of the respective materials, which shall comply with the following, as may be applicable:-

Chemical Composition (Ladle analysis)

**Carbon Steels  
Carbon 0.25% maximum
Silicon 0.35% maximum
Manganese 0.30% minimum
Phosphorus 0.05% maximum
Sulphur 0.05% maximum
**A carbon content not exceeding 0.35% may be permitted, subject to the approval of the Inspecting Authority.
Manganese Steels
Carbon 0.23% maximum
Silicon 0.20 to 0.60%
Manganese 0.90 to 1.30%
Phosphorus 0.05% maximum
Sulphur 0.05% maximum
Molybdenum Steels
Carbon 0.20% maximum
Silicon 0.10 to 0.45%
Manganese 0.35 to 0.80%
Phosphorus 0.05% maximum
Sulphur 0.05% maximum
Molybdenum 0.25 to 0.65%
Cromium-Molybdenum Steels
(1) Carbon 0.18% maximum
Silicon 0.10 to 0.60%
Manganese 0.35 to 0.70%
Phosphorus 0.05% maximum
Sulphur 0.05% maximum
Chromium 0.7 to 1.25%
Molybdenum

0.4 to 0.7%

 
(2) Carbon 0.15% maximum
Silicon 0.10 to 0.50%
Manganese 0.35 to 0.70%

Phosphorus

0.04% maximum
Sulphur 0.04% maximum
Chromium 2.0 to 2.5%
Molybdenum 0.9 to 1.2%

Mechanical Properties at 20°C (68°F)

Kind of Steel Tensile strength minimum *elongation        on
Lo=5do                or
Lo=5.65(Ao)1/2        
  kg/mm2 tons/in2 % minimum
Carbon Steels:
(1)
(2)

31.5
45

20
28

25
21
Manganese Steels:
(1)
(2)

47
52

30
33

23
19
Molybdenum Steels 37.5 24 22
Chromium-Molybdenum Steels
(1)
(2)

39
39

25
25

20
20

Note:-
Lo = original gauge length;
do = original diameter, and
Ao = original area of cross section.

 
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