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Reg. 9
MATERIALS OF CONSTRUCTION

STEEL PLATES, RIVETS, SECTION AND BARS IN CARBON STEEL

Process of manufacture

(a) Steel for plates shall be made by the open hearth, electric furnace or basic oxygen process or any other process which gives steel having equivalent specified properties.

(b) General deoxidation practice shall be appropriate to the type of steel used, particularly where the deoxidation practice influences the level of the elevated temperature properties of steel.

(c) Rimmed steels may be permitted only for riveted drums or shells made of plates having a nominal thickness upto 20 mm.

(d) Plates of carbon steel shall conform to one of the following four grades of tensile strength:-

(i) 37 to 45 kgf/mm2
(ii) 42 to 50 kgf/mm2
(iii) 47 to 56 kgf/mm2
(iv) 52 to 62 kgf/mm2

(e) Semi-killed steel may be used for plates in C and C-Mn steel with an upper limit of the tensile strength not exceeding 56 kg /mm2 and with thickness not exceeding 50mm under service temperature condition 0-450°C.


 
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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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