Message from
Chairman of Central Boilers Board


About Central Boilers
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

Reg. 49 A
MATERIALS OF CONSTRUCTION

SEAMLESS FERRITIC AND AUSTENITIC ALLOY STEEL BOILER, SUPERHEATER AND HEAT EXCHANGER TUBES

Tensile and hardness tests

The test specimen shall comply with the requirements as given in Table 3.  The hardness test may be carried out on the wall cross section or on a flat on the outside surface of the tube sample.

TABLE 3

 

MECHANICAL PROPERTY REQUIREMENTS

Grade

Yield strength

Mpa (kg/mm2)

Min

Tensile Strength

Mpa (kg/mm2)

Min

% Elongation

on

GL=50mm min *

          Hardness

 

 

HRB              HB

max               max

T1

205 (21.1)

380 (38.7)

30

   80                 146

T2

205 (21.1)

415 (42.2)

30

   85                 163

T5

205 (21.1)

415 (42.2)

30

   85                  163

T9

205 (21.1)

415 (42.2)

30

   89                 179

T11

205 (21.1)

415 (42.2)

30

   85                 163

T12

220 (22.5)

415 (42.2)

30

   85                 163

T22

205 (21.1)

415 (42.2)

30

   85                 163

T91

415 (42.2)

585 (59.6)

20

   25 HRC         250  

12X1Mf

274 (28.0)

441 (45.0)

637 (65.0)

21

   85                 163

X20Cr

MoV121

490 (50.0)

690 (70.4)

840 (85.7)

17

   25HRC          250

TP 304

205 (21.1)

515 (52.5)

35

   90                 192

TP304H

205 (21.1)

515 (52.5)

35

   90                 192

TP304L

170 (17.3)

485 (49.5)

35

   90                 192

TP310S

205 (21.1)

515 (52.5)

35

   90                 192

TP316

205 (21.1)

515 (52.5)

35

   90                 192

TP316H

205 (21.1)

515 (52.5)

35

   90                 192

TP316L

170 (17.3)

485 (49.5)

35

   90                 192

TP321

205 (21.1)

515 (52.5)

35

   90                 192

TP321H

205 (21.1)

515 (52.5)

35

   90                 192

TP347

205 (21.1)

515 (52.5)

35

   90                 192

TP347H

205 (21.1)

515 (52.5)

35

   90                 192

*GL = 5.65SO.

 

 
Back   Top
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