ASTM A204 alloy steel plates are chromium-molybdenum (Cr-Mo) alloy steel plates specifically designed for high-temperature and pressure vessel applications. They are recognized for their excellent creep resistance, elevated-temperature strength, and weldability, making them suitable for use in boilers, pressure vessels, and other industrial equipment operating under high heat and pressure. Below is a detailed overview:

1. Grades and Classifications

ASTM A204 specifies three grades, differentiated by their molybdenum content, which enhances high-temperature performance:

 

Grade A: Lowest molybdenum content

Grade B: Moderate molybdenum content

Grade C: Highest molybdenum content

 

Each grade is further produced in standard form, with no "class" subdivisions (unlike some other Cr-Mo standards like ASTM A387).

 

 

 

 

 

 

 

2. Chemical Composition

The key alloying elements (per ASTM A204/A204M) are chromium and molybdenum, with compositions varying by grade:

 

Element	Grade A (Typical)	Grade B (Typical)	Grade C (Typical)
Carbon (C)	≤0.25%	≤0.25%	≤0.25%
Manganese (Mn)	0.50–0.80%	0.50–0.80%	0.50–0.80%
Phosphorus (P)	≤0.035%	≤0.035%	≤0.035%
Sulfur (S)	≤0.040%	≤0.040%	≤0.040%
Silicon (Si)	0.15–0.40%	0.15–0.40%	0.15–0.40%
Chromium (Cr)	0.40–0.65%	0.40–0.65%	2.00–2.50%
Molybdenum (Mo)	0.45–0.60%	0.85–1.05%	0.90–1.10%

 

Chromium: Improves oxidation resistance and high-temperature strength.

Molybdenum: Enhances creep resistance (ability to resist deformation under prolonged high-temperature stress) and overall elevated-temperature performance.

 

 

 

 

 

 

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