SAE 4118H Structural Steel Bar

The relevant standards, chemical composition and mechanical properties of AISI 4118H Steel are as follows:

• Standards: Usually in accordance with standards such as ASTM A304-2016.

• Chemical Composition:

• Carbon (C): 0.18% - 0.23%

• Silicon (Si): 0.15% - 0.35%

• Manganese (Mn): 0.75% - 1.00%

• Phosphorus (P): Max 0.035%

• Sulfur (S): Max 0.040%

• Chromium (Cr): 0.80% - 1.10%

• Molybdenum (Mo): 0.15% - 0.25%

• Mechanical Properties:

• Tensile Strength: Min 785 MPa

• Yield Strength: Min 590 MPa

• Elongation: Min 12%

• Reduction of Area: Min 45%

• Hardness: 207 - 241 HB

 

The Applications of AISI 4118H Steel

AISI 4118H steel is a versatile and valuable material with a wide range of applications in various industries.

In the automotive industry, AISI 4118H steel is commonly used in the manufacturing of gears and shafts. The gears need to withstand high torque and repetitive stress, and the excellent mechanical properties of AISI 4118H steel, such as high strength and toughness, make it suitable for this demanding application. Shafts made from this steel provide reliable rotational support and can handle the dynamic loads within the vehicle's transmission system.

The machinery manufacturing sector also benefits from AISI 4118H steel. It is employed in the production of crankshafts for engines and various mechanical components. The crankshafts undergo complex cyclic loading, and the steel's fatigue resistance and durability ensure the long-term performance and reliability of the machinery.

In the field of agricultural equipment, AISI 4118H steel is utilized in the fabrication of parts such as axles and gears. The harsh operating conditions in agriculture, including heavy loads and exposure to dirt and moisture, require materials with strong corrosion resistance and mechanical strength. This steel meets these requirements, enabling the equipment to function reliably in the field.

The construction industry makes use of AISI 4118H steel in components like bolts, nuts, and structural elements. The strength and hardness of the steel provide stability and safety in building structures, while its resistance to wear and corrosion ensures the longevity of the components even in outdoor environments.

AISI 4118H steel is also found in the oil and gas industry. It is used in the manufacturing of drill collars and downhole tools. The ability of the steel to withstand high pressure and extreme temperatures makes it suitable for these challenging applications.

In power generation, components such as turbine shafts and couplings often incorporate AISI 4118H steel. The rotational speeds and forces involved in power generation require materials with high fatigue strength and dimensional stability.

The aerospace industry benefits from AISI 4118H steel in certain non-critical components where a combination of strength and cost-effectiveness is important.

Overall, the unique properties of AISI 4118H steel, including its mechanical strength, toughness, and durability, make it an essential material in numerous industries. Its applications contribute to the efficient operation, safety, and reliability of various mechanical systems and structures.

 

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