A is a kind of Mo-alloy steel material used to fabric high temperature pressure vessels. A204 this property is based on it's Mo composition. ASTM A-204/A-204M A204 has three grades or levels-- Grade A/B/C.

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ASTM A204 Grade A Pressure Vessel Steel plate Descriptions:

ASTM A204 Gr.A is a kind of Mo-alloy steel material used to fabric high temperature pressure vessels. A204 this property is based on it's Mo composition. ASTM A-204/A-204M A204 has three grades or levels-- Grade A/B/C. A204 steel grade specification covers molybdenum alloy, intended particularly of welded boilers and others pressure vessels steel plate in A204 Gr. A,A204 Gr .B and A204 Gr .C

Chemical Composition and Mechanical Properties:

A204 Grade A Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S
A204 Grade A	0.18-0.25	0.13-0.45	0.90-0.98	0.035	0.035

Mechanical Property of A204 Grade A steel plate	A204 Grade A
Tensile strength, kis [MPa]	65-85 [450-585]
Yield strength, min, kis [MPa]	37 [255]
Elongation in 8 in. [200 mm], min, %	19
Elongation in 2 in. [50 mm], min, %	23

Supplementary Technology: HIC Test | NACE MR0175 | Z15 | Z25 | Z35 | S1 | S2 | S3 | S4.1
S5 | S6 | S7 | S8 | S9| S11 | S12 | S14 | S17

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Boiler Pressure Vessel Steel