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ASTM A351 CF8M Chemical Composition
|
Element |
Weight Percentage (%) |
|
Carbon (C) |
≤ 0.08 |
|
Manganese (Mn) |
≤ 1.50 |
|
Silicon (Si) |
≤ 1.50 |
|
Phosphorus (P) |
≤ 0.04 |
|
Sulfur (S) |
≤ 0.04 |
|
Chromium (Cr) |
18.0 - 21.0 |
|
Nickel (Ni) |
9.0 - 12.0 |
|
Molybdenum (Mo) |
2.0 - 3.0 |
|
Iron (Fe) |
Balance |
ASTM A351 CF8 Chemical Composition
|
Element |
Weight Percentage (%) |
|
Carbon (C) |
≤ 0.08 |
|
Manganese (Mn) |
≤ 1.50 |
|
Silicon (Si) |
≤ 1.50 |
|
Phosphorus (P) |
≤ 0.04 |
|
Sulfur (S) |
≤ 0.04 |
|
Chromium (Cr) |
18.0 - 21.0 |
|
Nickel (Ni) |
8.0 - 11.0 |
|
Iron (Fe) |
Balance |
ASTM A351 CF8M Physical Properties
|
Property |
Value |
|
Density |
7.98 g/cm³ (0.29 lb/in³) |
|
Melting Point |
1370–1400°C (2498–2552°F) |
|
Elastic Modulus |
~193 GPa (28 × 10⁶ psi) |
|
Thermal Conductivity |
16.2 W/m·K at 20°C |
|
Specific Heat Capacity |
~500 J/kg·K at 20°C |
|
Electrical Resistivity |
720 nΩ·m at 20°C |
|
Coefficient of Thermal Expansion |
16.5 µm/m·K (20–100°C) |
ASTM A351 CF8 Physical Properties
|
Property |
Value |
|
Density |
7.98 g/cm³ |
|
Elastic Modulus |
193 GPa |
|
Thermal Conductivity |
16.2 W/m·K |
|
Specific Heat Capacity |
500 J/kg·K |
|
Melting Point |
1398–1420 °C |
|
Poisson's Ratio |
0.27–0.30 |
|
Thermal Expansion |
17.2 µm/m·K (at 20–100 °C) |
|
Electrical Resistivity |
0.73 µΩ·m |
ASTM A351 CF8M Mechanical Properties
|
Property |
Value |
|
Tensile Strength |
≥ 485 MPa (70 ksi) |
|
Yield Strength |
≥ 205 MPa (30 ksi) |
|
Elongation |
≥ 30% |
|
Hardness |
≤ 217 HB (Brinell) |
ASTM A351 CF8 Mechanical Properties
|
Property |
Value |
|
Tensile Strength |
485 MPa (min) |
|
Yield Strength (0.2% offset) |
205 MPa (min) |
|
Elongation at Break |
30% (min) |
|
Hardness |
150 HB (Brinell Hardness, max) |
|
Impact Toughness (Charpy) |
Typically >20 J at room temperature |
Specifications
-
ASTM A351 CF8:
Used in pumps, valves, and impellers for non-corrosive and mildly corrosive environments.
Common in industrial machinery, food processing, and general-purpose applications.
ASTM A351 CF8M:
Ideal for marine environments and chemical industries due to superior resistance to pitting and crevice corrosion.
ASTM A351 CF8M material is used in oil and gas equipment, pharmaceutical processing, and highly corrosive environments.
-
ASTM A351 CF8:
Cost-effective option for applications with low to moderate corrosion requirements.
Good mechanical properties with adequate corrosion resistance for general environments.
ASTM A351 CF8M:
ASTM A351 grade CF8M enhanced corrosion resistance, particularly against chlorides and other aggressive chemicals.
Better suited for applications demanding higher durability and resistance to harsh conditions.
-
Material Composition:
CF8 is equivalent to 304 stainless steel, while CF8M is equivalent to 316 stainless steel.
CF8M includes molybdenum, providing superior corrosion resistance compared to CF8.
Corrosion Resistance:
CF8 is suitable for general-purpose applications.
CF8M offers higher resistance to pitting, crevice corrosion, and chloride-induced stress cracking.
