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Reg. 49 A
MATERIALS OF CONSTRUCTION
SEAMLESS
FERRITIC
AND AUSTENITIC ALLOY STEEL BOILER, SUPERHEATER AND HEAT
EXCHANGER TUBES
Tensile and hardness tests
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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
= 5.65ÖSO”.
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