SA204 GR.B Mo Alloy Pressure Vessel steel plate

The SA 204 GR B specification covers the molybdenum alloy plates, and they are particularly intended for welded boilers and various other types of pressure vessels. The Astm A204 Grade B Plate is used in high temperature situations, and they come with higher yield and tensile strength.

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Product Description

SA204 GR.B Mo Alloy Pressure Vessel steel plate

1.What are the chemical compositions and mechanical properties of SA204 Grade B Mo Alloy Pressure Vessel steel plate?

SA204 Grade B Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S
A204 Grade B	0.20-0.27	0.13-0.45	0.90-0.98	0.035	0.035

Mechanical Property of SA203 Grade A steel plate	SA204 Grade B
Tensile strength, kis [MPa]	70-90 [485-620]
Yield strength, min, kis [MPa]	40 [275
Elongation in 8 in. [200 mm], min, %	17
Elongation in 2 in. [50 mm], min, %	21

2.How is SA 204 GrB pressure vessel steel cut?

After the performance indicators of SA204 GR.B Mo Alloy Pressure Vessel steel plate pass the factory inspection, they will be processed according to the cutting process, and can be cut, processed and cut according to the drawings. Generally, when the thickness of the steel plate is no more than 20mm, CNC plasma cutting or CNC laser cutting is preferred. If the thickness of the steel plate is more than 30mm, CNC flame cutting is usually selected, which can control the cutting accuracy and time.

3.What are the characteristics of SA204 GR.B Mo Alloy Pressure Vessel steel plate?

High Strength and Toughness

While ensuring sufficient strength, SA204GrB steel plates exhibit excellent low-temperature toughness. This is crucial for preventing brittle fracture of pressure vessels under extreme conditions.

Good Weldability

The steel plates have good welding adaptability, being easily compatible with various welding methods. Moreover, the welded joints feature high strength and good toughness, ensuring the safety and reliability of welded structures.

Hydrogen-Induced Crack Resistance

The specially designed chemical composition and heat treatment process enable SA204GrB steel plates to have good resistance to hydrogen-induced cracks, which is particularly important for applications in hydrogen-containing environments.

Corrosion Resistance

Although SA204GrB is not specifically designed for corrosion-resistant environments, its basic alloy composition still provides a certain degree of atmospheric corrosion resistance.