关于42CrMo4 和18CrNiMo7-6的用途 Introduction Steel is one of the most integral components for virtually any construction project. In Europe, two steel grades that are commonly used in engineering purposes are 42CrMo4 and 18CrNiMo7-6. Both of these alloys offer benefits to designers and constructors, but what distinguishes them from each other and which should you choose for your project? This article compares the two alloys in terms of their properties, characteristics, advantages, and disadvantages in order to provide guidance as to which one is the better fit for any given project.
Properties
42CrMo4 is a Chromium Molybdenum steel that provides high strength and hardness. It also offers good thermal and shock resistance, while exhibiting minimal creep even at elevated temperature. In addition, it provides good abrasion resistance, excellent toughness and good hardenability. Its tensile strength ranges between 830MPa to 1,070MPa, with a yield strength of around 750MPa to 850MPa. 18CrNiMo7-6 is an Alloy Steel, Chromium-Nickel-Molybdenum alloy steel that provides good ductility, impact and corrosion resistance. It has a tensile strength of around 900MPa to 1,100MPa, with a higher yield strength of around 800MPa to 900MPa. The hardness of this alloy is also higher than that of 42CrMo4 due to its higher carbon content.
Characteristics
When comparing the two alloys, 42CrMo4 has a higher strength but it is also more brittle when compared to 18CrNiMo7-6. The latter alloy is more ductile and resilient which makes it more suitable for applications that require additional resistance to fracture or fatigue. This property of 18CrNiMo7-6 also makes it more suitable for applications that need to be welded.
Advantages and Disadvantages
The main advantage of 42CrMo4, is its high strength and resists shock better than 18CrNiMo7-6. This makes it more suitable for uses such as long-term load bearing parts. In addition, it is easier to machine and can be used for cold-forming processes.
The main advantage of 18CrNiMo7-6 is its improved ductility, toughness, and weldability. Its higher carbon content provides additional material strength and hardness. It is suitable for applications that require strength and corrosion resistance such as pump components and automotive components.
Conclusion
Choosing the right steel grade for your project depends on the required strength and corrosion resistance requirements, as well as the application’s expected service life. 42CrMo4 has a higher strength than18CrNiMo7-6, but it is also more brittle and not as suitable for welded applications. On the other hand, 18CrNiMo7-6 is more ductile, resilient and suitable for welding applications. Therefore, if surface hardness and strength are the main criteria for a particular application, then 42CrMo4 is the better choice. If weldability and toughness are required, then 18CrNiMo7-6 is the better option.
