SA 387 Grade 11 Class 2 (often referred to as "Chrome-Moly" or "Cr-Mo" steel) is a chromium-molybdenum alloy steel plate designed for high-temperature and high-pressure applications, particularly in welded pressure vessels, boilers, and industrial equipment. Its name highlights its key alloying elements: chromium (Cr) and molybdenum (Mo), which enhance its strength, creep resistance, and oxidation resistance at elevated temperatures. Below is a detailed overview:

1. Chemical Composition

The alloy's composition is defined by ASTM A387/A387M standards, with key elements (typical ranges) as follows:

 

Chromium (Cr): 1.00–1.50% (improves oxidation and corrosion resistance)

Molybdenum (Mo): 0.44–0.65% (enhances high-temperature strength and creep resistance)

Carbon (C): ≤0.15% (controls hardness and weldability)

Manganese (Mn): 0.30–0.60% (aids in strength and ductility)

Silicon (Si): ≤0.50% (deoxidizer, improves oxidation resistance)

Phosphorus (P): ≤0.030% (minimized to avoid brittleness)

Sulfur (S): ≤0.030% (minimized to improve toughness)

Trace elements: Small amounts of nickel (Ni ≤0.30%), copper (Cu ≤0.30%), and nitrogen (N ≤0.03%).

 

 

 

 

 

 

 

 

 

2. Mechanical Properties (Class 2)

Class 2 plates undergo normalizing and tempering (heat treatment) to achieve finer grain structure and superior toughness compared to Class 1 (which is only stress-relieved). Key mechanical properties include:

 

Tensile strength: 415–585 MPa (60–85 ksi)

Yield strength: ≥205 MPa (30 ksi)

Elongation: ≥22% (in 200 mm / 8 inches)

Impact toughness: Minimum 27 J (20 ft·lbf) in Charpy V-notch testing at room temperature.

Hardness: ≤197 HB (Brinell).

3. Heat Treatment

Normalizing: Heating to 890–940°C (1634–1724°F), followed by air cooling to refine grain structure.

Tempering: Heating to 620–705°C (1148–1301°F) to relieve internal stresses and improve ductility.

 

 

 

 

 

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