The Truth About the Quality of SCM440H Steel Compared to SCM440 Steel

1. Similarities Between SCM440H and SCM440 Steel

a. SCM440 Steel

- Manufactured according to the JIS G4053 standard from Japan.

- SCM440 is a Chromium-Molybdenum steel known for its resistance to oxidation-induced corrosion, excellent tensile strength, and high heat resistance, especially in saline environments. This steel is commonly used for manufacturing gears, pump shafts, and machinery components in industries like petroleum and marine.

b. SCM440H Steel

- Manufactured according to the JIS G4052 standard from Japan.

- SCM440H, available as solid round bars, is ideal for components subjected to heavy loads, impacts, and wear.

2. Comparison of Characteristics

a. Characteristics of SCM440 Steel

Based on its chemical composition, SCM440 steel exhibits the following properties:

- High resistance to deformation and excellent wear resistance.

- Uniform hardness across all dimensions.

- Easy machinability using wire methods.

- Improved load-bearing, wear resistance, and impact resistance compared to carbon steels like S45C, S50C, and S55C.

b. Characteristics of SCM440H Steel

SCM440H steel, especially in its solid round form, offers:

- Excellent resistance to deformation.

- High durability, load-bearing capacity, and wear resistance, even under intense working conditions.

- Easy cutting and machining properties.

- Tensile strength of approximately 9.8.

- Hardness before heat treatment ranges from 22 HRC to 35 HRC, depending on the size.

3. Applications of SCM440H and SCM440

a. Applications of SCM440 Steel

With its notable mechanical properties, SCM440 steel is highly suitable for various mechanical and industrial applications:

- Heavy-load, high-impact machine parts like gears, engine transmission shafts, screws, and bolts.

- Commonly used in automotive and motorcycle engine manufacturing.

- Ideal for creating molds (plastic injection molds, rice husk molds, etc.).

- Bolts for telecommunications towers.

- Operation shafts in sugar mill presses.

- Rolls and gears in steel rolling mills.

b. Applications of SCM440H Steel

SCM440H steel is widely used in industries such as:

- Shipbuilding: For constructing durable hulls and frames.

- Structural applications: For factory structures, bridges, and piers.

- Mechanical engineering: Precision machining for bolts, gears, shafts, and other load-bearing components.

- Construction: Ideal for components in vehicles, trains, and industrial tools.

Key Takeaways

SCM440H and SCM440 steel share many similarities in application, but their chemical compositions and targeted applications distinguish them. SCM440H offers additional durability and performance in high-impact and wear-intensive environments, making it an excellent choice for precision and structural engineering.

If you are searching for the right steel grade to meet your specific requirements, contact Sevit for personalized advice and solutions!

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