ASTM A204 Pressure Vessel Plate

There are there grades under ASTM A204 standard: Grade A, Grade B, Grade C. ASTM A204 specifies molybdenum alloy steel plates A204 A, A204 B, andA204 C, intended particularly for welded boilers and other pressure vessels.
A204 A, A204 B, andA204 C Steel Plates Specification
Thickness: 3-150mm
Width: 1220-4200mm
Length: 5000-18000mm
Notes: coil thickness ≤ 25mm

A204 A, A204 B, A204 C Pressure Vessel Plates Chemical Requirements

Elements	Composition %
Elements	Grade A	Grade B	Grade C
Carbon, max.:
up to 1 in. [25 mm] incl. in thickness	0.18	0.20	0.23
Over 1 in. to 2 in [50 mm] incl. in thickness	0.21	0.23	0.26
Over 2 in. to 4 in. [100 mm] incl. in thickness	0.23	0.25	0.28
Over 4 in. [100 mm] incl. in thickness	0.25	0.27	0.28
Heat analysis:	0.90	0.90	0.90
Product analysis:	0.98	0.98	0.98
Phosphorus, max A	0.035	0.035	0.035
Sulfur, max A	0.040	0.040	0.040
Heat analysis	0.15-0.40	0.15-0.40	0.15-0.40
Product analysis	0.13-0.45	0.13-0.45	0.13-0.45
Heat analysis	0.45-0.60	0.45-0.60	0.45-0.60
Product analysis	0.41-0.64	0.41-0.64	0.41-0.64

A204 A, A204 B, andA204 C Pressure Vessel Plates Tensile Requirements

	Grade A		Grade B		Grade C
	ksi	[MPa]	ksi	[MPa]	ksi	[MPa]
Tensile strength	65-85	[450-585]	70-90	[485-620]	75-95	[515-655]
Yield strength, min.A	37	[255]	40	[275]	43	[295]
Elongation in 8 in. [200 mm], min, %	19B		17B		16B
Elongation in 2 in. [50 mm], min, %	23B		21B		20B

The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements.

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