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Reg. 307 


SPRINGS AND TORSION BARS

Materials

(a) Springs

 
The springs shall be manufactured from steel made by the Acid Open Hearth or Electric Process and the Chemical composition shall be within the following limits:

Carbon Steel
Element Per cent
Min. Max
Carbon 0.90 1.20
Silicon   0.30
Manganese 0.45 0.80
Sulphur   0.050
Phosphorus   0.050
Silicon Manganese Steel
Element

Per cent

Min. Max
Carbon 0.50 0.65
Silicon 1.50 2.00
Manganese 0.70 1.00
Sulphur   0.050
Phosphorus   0.050


Alloy Steel
  Grade I Grade II Grade III Grade IV
Carbon % 0.55 to o.65 0.46 to 0.54 0.55 to 0.65 0.55 to 0.65
Manganese % 0.70 to 1.00 0.70 to 0.90 0.70 to 1.00 0.70 to 1.00
Silicon % 0.10 to 0.35 0.10 to 0.35 0.10 to 0.35 1.70 to 2.10
Chromium % 0.60 to 0.90 0.80 to 1.10 0.40 to 0.60 0.20 to 0.40
Molybdenum % - - 0.15 to 0.25 0.20 to 0.30
Vanadium % - 0.15 min - -
Nickel % - - 0.40 to 0.70 -
Phosphorus % - - - -
Sulphur - - - -

The Manufacturers shall supply an analysis of each cast when required by the Inspecting Authority to do so. Should independent analysis be required, these shall be made at the rate of one per cast.

All springs shall be formed hot and suitably hardened and tempered.

All the springs above 16 mm bar diameter shall be formed hot and the springs below 16 mm bar diameter shall be formed hot or cold. The springs shall be suitably hardened and tempered.
 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
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