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:

Grade	Tensile Strength ksi [MPa]
A	65-85 [450-585]
B	70-90 [485-620]
C	75-95 [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 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

Element	t	Composition, %
Element	t	Gr. A	Gr. B	Gr. C
C	t≤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
Mn	All	≤0.90	≤0.90	≤0.90
P	All	≤0.025	≤0.025	≤0.025
S	All	≤0.025	≤0.025	≤0.025
Si	All	0.15-0.40	0.15-0.40	0.15-0.40
Mo	All	0.45-0.60	0.45-0.60	0.45-0.60

*All values shall be applied to heat analysis.

Mechanical Properties

ASTM A204	Gr. A	Gr. B	Gr. 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. %	19	17	16
El. in 2" min. %	23	21	20

*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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