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Reg. 233
, Reg. 234
FUSION WELDED AND SEAMLESS FORGED DRUMS FOR WATER TUBE BOILERS AND SUPERHEATERS

General Requirements

Where applicable the general terms of Chapter I relating to Certificates from Makers, Inspecting Authorities, etc., and of Chapter III concerning construction should be followed.

 


Reg. 234

MATERIALS OF CONSTRUCTION

Materials for Fusion Welded Boiler Drums
 

a)

The requirements of Chapter II, so far as they relate to plates, shall apply, excepting that the chemical composition tensile strength and elongation of the material used shall conform to the following, as may be applicable to the quality of steels concerned:

Chemical Composition (ladle analysis)

Carbon steels       

*Carbon 0.25% maximum
Silicon 0.35% maximum
Manganese 0.40 to 0.90%
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 0.15 to 0.60%
Manganese 0.90 to 1.40%
Phosphorus 0.05% maximum
Sulphur 0.05% maximum
Molybdenum Steels
Carbon 0.21% maximum
Silicon 0.15 to 0.35%
Manganese 0.50 to 0.90%
Phosphorus 0.05% maximum
Sulphur 0.05% maximum
Molybdenum 0.25 to 0.60%
Chromium-Molybdenum Steels
Carbon 0.21% maximum
Silicon 0.15 to 0.35%
Manganese 0.40 to 0.80%
Phosphorus 0.04% maximum
Sulphur 0.04% maximum
Chromium 0.7 to 1.15%
Molybdenum 0.40 to 0.65%

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/sq.in. % minimum
Carbon Steels:
(1)
(2)
(3)
(4)
(5)

35
38.5
41
44
47

22
24.5
26
28
30

22
21
20
19
18
Manganese Steels:
(1)
(2)

47
52

30
33

18
16
Molybdenum Steels 44 28 19
Chromium-Molybdenum Steels 42 27 20

*Note:-

Lo = original gauge length;
Do = original diameter, and
Ao = original area of cross section.

NOTE:- A range of not more than 20 per cent of the minimum tensile strength shall be permitted in each class of material.

b) Plates over 2” in thickness before being fabricated, shall be uniformly heat treated to produce grain refinement. Heat treatment involving quenching in a liquid medium is not permitted.
 
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