42CrMo4: The Ultimate Alloy Steel

​42CrMo4, a high-performance alloy steel, offers a unique combination of chemical composition, mechanical properties, heat treatment, low-temperature impact resistance, and diverse applications. It is a widely used material in various industries due to its exceptional strength and durability.
Chemical Composition
The primary alloying elements in 42CrMo4 steel include chromium (Cr), molybdenum (Mo), and carbon (C). These elements contribute to the steel's exceptional tensile strength, impact resistance, and corrosion resistance. The precise chemical composition of 42CrMo4 varies depending on the manufacturer, but generally, it falls within the following ranges:
C: 0.39%-0.45%
Si: 0.17%-0.37%
Mn: 0.50%-0.80%
Cr: 0.90%-1.20%
Mo: 0.20%-0.30%
S: ≤0.030%
P: ≤0.030%
Mechanical Properties
42CrMo4 steel offers a combination of high strength and ductility, making it suitable for a wide range of load-bearing and冲击resistant applications. The material exhibits good fatigue resistance and can withstand repeated stress without failure. Its yield strength is typically in the range of 800-1000 MPa, while the tensile strength can reach up to 1100 MPa.
Heat Treatment
Heat treatment is essential to achieve the desired mechanical properties in 42CrMo4 steel. The process typically involves heating the steel to a temperature between 715°C and 740°C, holding it there for a period of time to ensure complete diffusion of alloying elements, and then cooling it slowly to room temperature. This treatment results in a fine-grained structure with uniform distribution of alloying elements, enhancing the material's mechanical properties.
Impact Test
42CrMo4 steel exhibits excellent low-temperature impact test, making it suitable for use in cryogenic and other extreme temperature environments. The material passes standard low-temperature impact testing without failure, ensuring its reliability in cold conditions. The impact resistance of 42CrMo4 steel is further enhanced by its toughness, which is achieved through proper heat treatment and processing.
Main Applications
Due to its exceptional mechanical properties and versatility, 42CrMo4 steel is used in a wide range of applications across various industries. Some of the main applications include:
Shipbuilding& Offshore: Used for hull structures, shafts, propellers, and other load-bearing components that require high strength and impact resistance.
Heavy Machine: Used in manufacturing heavy machinery, such as crushers, excavators, and other mining equipment that operate under high stress and load conditions.
Boiler: In the manufacturing of pressure vessels, reactors, and other containment structures that require high tensile strength and corrosion resistance.
Auto Industry: Used in the manufacturing of transmission components, steering parts, and other critical components that require durability and performance.
TJC’s Supply Cases:
TJC is a leading manufacturer and supplier of 42CrMo4 steel plate. We have supplied this high-performance material to various industries, including the automotive, energy, petrochemical, and construction sectors. Some of our recent supply cases include:
Auto Industry Case：We supplied 42CrMo4 steel plate to a leading automotive manufacturer for the production of transmission components that require high strength and durability. The plate was heat treated to achieve the desired mechanical properties and delivered to the customer in a timely manner.