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» Base Material » ASTM A204/ ASME SA-204 Pressure Vessel Plate

ASTM A204/ ASME SA-204 Pressure Vessel Plate

August 16, 2020

Standard, Grades & Thicknesses

Pressure vessel plates made of ASTM A204 (identical with ASME SA-204) steels are typical molybdenum-alloy steel plates intended particularly for welded boilers and other pressure vessels. The steel grades covered by ASTM A204/ ASME SA-204 are all carbon-molybdenum alloy steels with nominal composition of C-0.5Mo. Plates under this standard specification are available in three grades having different strength levels as follows:

GradeTensile Strength
ksi [MPa]
A65-85 [450-585]
B70-90 [485-620]
C75-95 [515-655]

The maximum thickness of ASTM A204 plates is limited only by the capacity of the composition to meet the specified mechanical property requirements; however, current practice normally limits the maximum thicknesses of plates made of Grade A, Grade B and Grade C steel to 6″ [150 mm], 6″ [150 mm], 4″ [100 mm], respectively.

Manufacture & Heat Treatment

ASTM A204 Gr.B plates, normalized

ASTM A204 Grade B C-0.5Mo alloy steel pressure vessel plates in stock, normalized.

The ASTM A204 plates shall be made from killed steels. Plates 1-1/2″ [40 mm] and under in thickness are normally supplied in the as-rolled condition. The plates may be ordered normalized or stress relieved or both. Plates over 1-1/2″ [40 mm] in thickness shall be normalized.

Chemical Composition Requirements

ElementtComposition, %
Gr. AGr. BGr. C
Ct≤1"≤0.18≤0.20≤0.23
1"≤0.21≤0.23≤0.26
2"≤0.23≤0.25≤0.28
t>4"≤0.25≤0.27≤0.28
MnAll≤0.90≤0.90≤0.90
PAll≤0.025≤0.025≤0.025
SAll≤0.025≤0.025≤0.025
SiAll0.15-0.400.15-0.400.15-0.40
MoAll0.45-0.600.45-0.600.45-0.60
*All values shall be applied to heat analysis.

Mechanical Properties

ASTM
A204
Gr. AGr. BGr. C
T.S.
MPa
[ksi]
450-585
[65-85]
485-620
[70-90]
515-655
[75-95]
Y.S. min.
MPa
[ksi]
255
[37]
275
[40]
295
[43]
El. in 8"
min. %
191716
El. in 2"
min. %
232120
*T.S.: tensile strength; *Y.S.: yield strength; El.: elongation.

Optional Testing

Additional tension test, Charpy V-Notch test, drop weight test, high-temperature tension test, ultrasonic examination, magnetic particle examination.

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