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Reg. 38
MATERIALS OF CONSTRUCTION

COLD DRAWN SEAMLESS CARBON STEEL BOILER AND SUPERHEATER TUBES FOR DESIGN METAL TEMPERATURES NOT EXCEEDING 454°C (850°F).

Tensile and Hardness Tests

The test specimen shall comply with the following requirements.  The hardness test may be carried out on the wall cross section or on a flat on the outside surface of the tube sample.

 

  Grade  

 

Yield Strength Mpa (kg./mm2) min

Tensile Strength Mpa    (kg/mm2) min

% Elongation on

GL = 50 mm min

Hardness (max)

 

HRB         HB

TA

80(18.3)

325(33.1)

35

77

137

TB

255(26.1)

415(42.2)

30

79

143

TC

275(28.2)

485(49.3)

30

89

179

Note.- For longitudinal strip tests a deduction in percentage elongation 1.5% shall be made for each  0.8 mm decrease in wall thickness under 8mm from the minimum elongation value requirement.

 
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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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