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13CrMo4-4 is a low-alloy steel grade that is widely used in high-temperature applications such as pressure vessels and boilers. It offers excellent resistance to creep and rupture at elevated temperatures.
Chemical Composition:
The chemical composition of 13CrMo4-4 steel grade is as follows:
– Carbon (C): The carbon content in 13CrMo4-4 steel is typically around 0.10-0.17%.
– Silicon (Si): Silicon is present in 13CrMo4-4 steel in small amounts, usually around 0.10-0.35%.
– Manganese (Mn): The manganese content in 13CrMo4-4 steel is typically around 0.40-0.80%.
– Phosphorus (P): The phosphorus content is limited to a maximum of 0.025% in 13CrMo4-4 steel.
– Sulfur (S): The sulfur content is limited to a maximum of 0.010% in 13CrMo4-4 steel.
– Chromium (Cr): Chromium is the major alloying element in 13CrMo4-4 steel, with a typical content of 0.70-1.15%. Chromium enhances the steel’s heat resistance and high-temperature strength.
– Molybdenum (Mo): Molybdenum is present in 13CrMo4-4 steel in small amounts, usually between 0.40-0.60%. Molybdenum improves the steel’s creep resistance and provides increased tensile strength at high temperatures.
Mechanical Properties:
The mechanical properties of 13CrMo4-4 steel grade include:
– Tensile Strength: The tensile strength of 13CrMo4-4 steel is typically in the range of 440-590 MPa.
– Yield Strength: The yield strength of 13CrMo4-4 steel is typically in the range of 290-440 MPa.
– Elongation: The elongation of 13CrMo4-4 steel is typically around 22-24%, indicating its good ductility.
– Impact Toughness: 13CrMo4-4 steel exhibits good impact toughness at room temperature and even at elevated temperatures.
– Hardness: The hardness of 13CrMo4-4 steel varies depending on the heat treatment and can typically range from 130 to 180 HB.
Overall, 13CrMo4-4 steel grade offers excellent resistance to high temperatures, making it suitable for use in applications where strength and resistance to creep and rupture are required. Its good ductility and impact toughness make it a reliable choice for demanding conditions.
13CrMo4 4 Steel grade
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