Key Properties and Applications of 42CrMo4 Steel Round Bar
In various high-end equipment manufacturing fields, gear steel round bars (Gear steel round bar) serve as a crucial foundational material, directly influencing the performance and lifespan of mechanical equipment. Broadly speaking, gear steel encompasses a variety of materials ranging from low-carbon steel to medium-carbon alloy steel, such as 20, 20Cr, 40Cr, and the 42CrMo4 alloy steel round bar (42CrMo4 alloy steel round bar) which is the focus of this article. After undergoing heat treatment, these steel materials can achieve an excellent balance of strength, hardness, and toughness, or form a composite performance with surface wear resistance and core strength and toughness. Therefore, they become the preferred materials for core components such as heavy-duty gears and transmission shafts.
Key performance advantages of 42CrMo4 steel
As a representative of medium-carbon alloy steel, 42CrMo4 round bar (42CrMo4 round bar) possesses the following outstanding characteristics:
1. High strength and high hardenability: Suitable for quenching and tempering treatment of large-section workpieces, ensuring uniform performance of the core and surface.
2. Excellent toughness reserve: Can maintain stable mechanical properties even under low temperatures or impact loads.
3. Resistance to high-temperature creep: Can work in high-temperature environments for a long time, maintaining stable dimensions and performance.
4. Small thermal treatment deformation: Effectively reduces the risk of deformation in precision gear processing, improving product qualification rate.
Main application scenarios
Due to its comprehensive performance, 42crmo4 steel round bar (42crmo4 steel round bar) is widely used in the following applications:
- Heavy-duty transmission components: such as gearboxes for wind turbines, large gears for ship propulsion systems, transmission shafts for mining machinery, etc.
- High-end mold manufacturing: used for die-casting molds, injection mold frames, etc. in scenarios requiring high fatigue strength.
- Special equipment fields: such as drill pipe joints for oil drilling tools (below 2000 meters), core components of heavy presses, etc.
Select reliable material partners
In the material supply chain, the technical services and quality guarantees provided by suppliers are of utmost importance. Since its establishment in Yangpu District, Shanghai in the early 1980s, ZZ Group (ZZ Group) has grown into a large-scale comprehensive enterprise group integrating steel trading, processing and distribution, and financial investment. With a registered capital of 200 million RMB, it is a leading enterprise in China's metal materials industry, a "hundred-top trustworthy enterprises" in national steel trading logistics, and one of the top 100 private enterprises in Shanghai. As a leading enterprise in China's metal materials industry and a "hundred-top trustworthy enterprise" in national steel trading logistics, the group not only provides a full range of steel products including alloy steel round bars (Alloy Steel Round Bar), but also relies on its professional technical team to offer value-added services such as material selection and heat treatment process guidance, helping manufacturing customers enhance their product competitiveness.
Under the trend of industrial upgrading and the domestication of high-end equipment, making the right choice of high-performance materials such as 42CrMo4 alloy steel round bars, and collaborating with supply chain partners with technical and service capabilities, will become an important part for enterprises to build product advantages. ZZ Group will continue to deeply focus on the field of metal materials, using high-quality products and services to empower Chinese manufacturing to develop towards higher-end and intelligent directions.
Post time: Jan-29-2026
