Hot - rolled Coil of 35ACR Cold Heading Steel

35ACR is a commonly used cold heading steel, belonging to medium carbon steel, and it has good cold heading performance and mechanical properties. It is widely used in the manufacturing of high-strength fasteners such as bolts, nuts, screws, rivets, and other parts that require cold heading forming. The hot-rolled coil of 35ACR is a common form of supply, which is suitable for subsequent cold heading processing.

Core application scenarios of the hot-rolled coil of 35ACR cold heading steel:

High-strength fasteners

Automobile: Chassis bolts, engine connecting rod bolts (Grade 10.9 and above).

Construction machinery: Hydraulic joint screws, fasteners of the transmission system.

Wind power: High-strength bolts of the tower (heat treatment is required).

Cold-formed parts

Cold-extruded gear blanks, pins with complex shapes, rivets, etc.

Advantages

The addition of aluminum element enhances the decarburization resistance ability and reduces the risk of head cracks.

The fatigue strength is superior to that of ordinary cold heading steel, making it suitable for dynamic load working conditions.

Characteristics of the hot-rolled coil of 35ACR cold heading steel:

Composition characteristics: On the basis of traditional cold heading steel, the contents of Si and Mn have been adjusted, and the Cr element has been added, while the contents of P and S have been reduced. This composition design increases the critical quenching diameter of the steel when cooled in oil to 18 - 20mm, improves the hardenability of the steel, and has a large hardness difference after the same high-temperature tempering, with strong resistance to tempering stability.

Processing performance: It belongs to cold heading steel and is suitable for the cold heading forming process. After hot rolling, the coil has good plasticity and toughness, and can be processed into various shapes of fasteners such as bolts and nuts through cold heading at room temperature. The material has strong deformation ability during the processing, and it is not easy to have defects such as cracking.

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