SCR440 is a Japanese Industrial Standard (JIS G4053) grade of chromium alloy steel widely used for machine structural applications. It is known for its excellent balance of strength, toughness, and wear resistance after appropriate heat treatment.
Key Properties and Characteristics
SCR440 alloy steel plate offers several desirable mechanical properties:
- Good Hardenability: Achieves high hardness and strength through quenching and tempering.
- High Tensile Strength: Suitable for components subjected to high stresses.
- Good Toughness: Maintains good impact resistance, especially after tempering.
- Wear Resistance: The chromium content contributes to improved wear characteristics.
- Machinability: Fairly machinable in the annealed or normalized condition.
Chemical Composition (JIS G4053)
The typical chemical composition of SCR440 steel is as follows:
- Carbon (C): 0.38 – 0.43%
- Silicon (Si): 0.15 – 0.35%
- Manganese (Mn): 0.60 – 0.90%
- Phosphorus (P): ≤0.030%
- Sulfur (S): ≤0.030%
- Chromium (Cr): 0.90 – 1.20%
Minor variations may exist depending on the specific manufacturing standards and supplier specifications.
Common Applications
SCR440 steel plate is extensively used in the manufacturing of various components requiring high strength and durability. Common applications include:
- Gears and Pinions
- Shafts (e.g., axle shafts, crankshafts)
- Fasteners (high-strength bolts and studs)
- Connecting Rods
- Machine Tool Spindles
- Structural parts subjected to dynamic loads
Heat Treatment and Supply in China
To achieve its optimal mechanical properties, SCR440 steel is typically subjected to heat treatments such as normalizing, annealing, quenching, and tempering. The specific parameters of these treatments depend on the desired final properties and application requirements. Chinese steel manufacturers offer SCR440 steel plates in various conditions, including hot-rolled, annealed, or quenched and tempered. When sourcing SCR440 steel plates from China, it is important to work with reputable suppliers who can provide material test certificates and ensure quality consistency. Companies like Shanxi Luokaiwei Steel Company are among the suppliers who can provide such materials.
Many Chinese steel mills produce SCR440 or its equivalents, making it readily available in plate, bar, and other forms. Buyers should specify their requirements clearly, including dimensions, tolerances, heat treatment condition, and any testing requirements. For critical applications, verifying the supplier’s quality control processes is essential. Some specialized suppliers, including Shanxi Luokaiwei Steel Company, may offer additional services like custom cutting or testing.
Ensuring the correct grade and quality is paramount for the performance of the final components. Partnering with an experienced steel distributor or mill, such as Shanxi Luokaiwei Steel Company, can help in navigating the complexities of sourcing specialized alloy steels like SCR440 from the Chinese market, ensuring compliance with international standards and project specifications.
