13CrMo4-4 Steel Grade: A Reliable Material for Pressure Vessel Applications

13CrMo4-4 is a low alloy steel grade that is primarily used for pressure vessel applications. It often serves as a reliable material due to its unique mechanical properties and chemical composition.

Mechanical Properties:
– Tensile Strength: The minimum value for this property is 450-600 MPa, providing the steel grade with excellent strength.
– Yield Strength: 13CrMo4-4 has a minimum yield strength of 275-450 MPa, ensuring it can withstand high pressures within pressure vessels.
– Elongation: The minimum elongation percentage is 22%, meaning the material exhibits good ductility.
– Impact Toughness: It possesses good impact toughness at low temperatures, which is crucial for pressure vessels operating in extreme conditions.
– Hardness: The steel grade can achieve a hardness range of 130-160 HV.

Chemical Composition:
– Carbon (C): The maximum carbon content is 0.17%, ensuring good weldability and avoiding issues related to carbon content.
– Silicon (Si): The maximum silicon content is 0.35%, preventing excessive hardness and brittleness.
– Manganese (Mn): The steel grade contains a maximum manganese content of 0.70%, which contributes to its strength and hardenability.
– Phosphorus (P): The maximum phosphorus content is 0.025%, ensuring good weldability and avoiding brittleness issues.
– Sulfur (S): The maximum sulfur content is 0.020%, minimizing the risk of cracking during welding.
– Chromium (Cr): With a chrome content of 0.70-1.15%, the material demonstrates good corrosion resistance and high-temperature strength.
– Molybdenum (Mo): The steel grade contains 0.40-0.60% molybdenum, which enhances its mechanical properties, including strength and hardness.
– Nickel (Ni): The maximum nickel content is 0.30%, contributing to the material’s toughness and impact resistance.

The combination of these mechanical properties and chemical composition make 13CrMo4-4 a reliable choice for pressure vessel applications, as it can withstand high pressures, exhibit good weldability, and offer excellent resistance to corrosion and cracking.
13CrMo4 4 Steel grade
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