– The 38NiCrMo4 KB steel grade has a specified chemical composition and mechanical properties that determine its strength and durability.
– The steel grade is known for its high tensile strength, good toughness, and excellent shock resistance.
– It is commonly used in applications where high strength and durability are required, such as in the manufacturing of gears, shafts, and structural components.
– The steel grade is typically hot-rolled or forged to achieve the desired mechanical properties and shape.

Mechanical Properties:
– Tensile Strength: The 38NiCrMo4 KB steel grade has a minimum tensile strength of 1000 MPa, making it highly suitable for high-stress applications.
– Yield Strength: It has a minimum yield strength of 800 MPa, ensuring its ability to withstand significant loads without permanent deformation.
– Elongation: The steel grade has a minimum elongation of 12% to provide sufficient ductility and resist brittle fracture.
– Hardness: The hardness of 38NiCrMo4 KB steel is typically in the range of 280-320 HB.

Chemical Composition:
– Carbon (C): Carbon content in the 38NiCrMo4 KB steel grade is typically between 0.35% and 0.43%. It provides strength and hardness to the steel.
– Silicon (Si): Silicon is present in trace amounts and typically ranges from 0.15% to 0.35%. It enhances the steel’s strength and promotes deoxidation during manufacturing.
– Manganese (Mn): Manganese content is typically between 0.50% and 0.80%. It improves the steel’s hardenability, strength, and wear resistance.
– Chromium (Cr): Chromium content is around 0.90% to 1.20%. It contributes to the steel’s hardenability, corrosion resistance, and fatigue strength.
– Molybdenum (Mo): Mo content is typically between 0.15% and 0.25%. It enhances the steel’s hardenability, thermal stability, and strength at elevated temperatures.
– Nickel (Ni): Nickel content is usually around 1.30% to 1.70%. It improves the steel’s toughness, impact resistance, and high-temperature strength.
– Phosphorus (P): The maximum phosphorus content is 0.035%. Excessive phosphorus can adversely affect the steel’s toughness and weldability.
– Sulfur (S): The maximum sulfur content is 0.035%. Excessive sulfur can reduce the steel’s ductility and impact toughness.
– Chromium (Cr): The maximum copper content is 0.30%. Copper can improve the steel’s corrosion resistance and mechanical properties.
– Nitrogen (N): The maximum nitrogen content is 0.020%. Nitrogen can increase the steel’s strength and hardenability.

The specified mechanical properties and chemical composition of 38NiCrMo4 KB steel grade ensure its suitability for high-stress applications requiring strength, durability, and resistance to wear and fatigue.
38NiCrMo4 KB Steel grade