SA387 Gr22 alloy steel plates are a type of chromium-molybdenum (Cr-Mo) alloy steel plates specified under the ASME (American Society of Mechanical Engineers) standard, widely recognized for their excellent high-temperature performance, corrosion resistance, and structural stability. They are primarily designed for high-pressure, high-temperature (HPHT) applications in critical industries. Below is a detailed overview:

Chemical Composition

The key alloying elements in SA387 Gr22 plates contribute to their superior properties:

 

Chromium (Cr): 2.00–2.50% – Forms a dense oxide film to resist high-temperature oxidation and enhances corrosion resistance.

Molybdenum (Mo): 0.90–1.10% – Strengthens the ferrite matrix, improves creep resistance (resistance to deformation under long-term high-temperature stress), and stabilizes mechanical properties at elevated temperatures.

Carbon (C): ≤0.15% – Balances strength and weldability; low carbon content minimizes the risk of hardening and cracking during welding.

Other elements: Manganese (Mn), Silicon (Si), Phosphorus (P), Sulfur (S) (with strict limits to ensure purity and performance).

Mechanical Properties

After standard heat treatment (normalizing + tempering), SA387 Gr22 plates exhibit the following key mechanical properties:

 

 

 

 

 

 

 

 

Tensile strength: 415–585 MPa

Yield strength: ≥205 MPa

Elongation: ≥22% (in 200 mm gauge length)

Impact toughness: Good toughness at room and elevated temperatures, ensuring resistance to brittle fracture under dynamic loads.

Key Properties

High-Temperature Performance

Service temperature range: Can operate long-term in temperatures up to 550°C. At these temperatures, they maintain stable tensile strength, yield strength, and creep resistance, making them suitable for continuous exposure to high heat.

Creep resistance: Molybdenum's presence inhibits grain boundary sliding and dislocation movement at high temperatures, reducing the risk of gradual deformation under sustained loads – critical for boiler tubes, superheaters, and pressure vessels.

 

 

 

 

 

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