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Reg. 91
MATERIALS OF CONSTRUCTION

GENERAL GREY IRON CASTINGS (GRADE A)

Tensile test

A tensile test bar machined to the dimensions shown in Regulation 88(b) and tested with either plain or screwed ends must show a breaking strength of not less than that shown in the following table:-

Diameter of test bar
Minimum ultimate tensile stress – Grade A

Inches

Tons per sq. inch
0.6 12.5
0.875 12
1.2 11
1.6 10.5
2.1 10


Note – Self-aligning grips to ensure axial loading are recommended.

 
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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
Indian Boilers Act 1923 Ibr Forms Home Search Help Contact Us