What is Duplex steel (DP)？

Duplex steel is made of martensite or austenite and a ferrite matrix. It is a high-strength steel material commonly used in automotive manufacturing. We want to introduce the application of DP steel in automotive production.

Frequently used automotive component locations for duplex steels

No 1. Structural body parts:

Duplex steels are often used for structural parts such as body sides and front and rear door frames. These parts need to withstand impact forces while maintaining good formability.

No 2. B-pillar and C-pillar:

B-pillars and C-pillars are very critical parts of the body structure, carrying the weight of the vehicle and providing safety protection in the event of a crash. The high strength of duplex steel makes it ideal for these components.

No 3. Side Impact Protection Beams:

Side-impact beams protect occupants in side-impact collisions. Duplex steels are often used in this area due to their high tensile strength and good formability.

No 4. Chassis and frame components:

The chassis portion of the frame, such as the longitudinal beams and cross-members, are subjected to intense impacts and loads, and dual-phase steels are often used to improve impact resistance and strength.

No 5. Inner door frames:

Duplex steel is also often used in the inner door frames to help reduce the weight of the doors while ensuring that the occupants are effectively protected in the event of a collision.

No 6. Front and Rear Impact Beams:

The purpose of the impact beams is to absorb the impact of a collision and protect the body structure. Duplex steels are also used to advantage in these components, especially when high strength and impact resistance are required.

NO7. Underbody Protection Panels:

In some high-end models and electric vehicles, protective parts of the chassis, such as battery guards, are made of dual-phase steel to increase the strength and impact resistance of the underbody.

What is Hot-dip galvanized duplex steel?

Duplex steel is also used in the manufacture of automotive fuel systems, such as fuel tanks, oil pumps, fuel pipelines, and other parts. These parts require materials with excellent corrosion resistance and strength. The use of duplex steel can greatly improve the corrosion resistance and strength of the fuel system, ensuring that it operates reliably over time.

Hot-dip Galvanized Duplex Steel

Anti-corrosion treatment of automobile steel is required to prevent corrosion throughout the service procedure. Hot-dip galvanizing is a popular anticorrosion procedure. Hot-dip galvanized biphase steel products are commonly utilized in car doors, wheels, and longitudinal beams of car bodywork. This treatment process efficiently prevents air corrosion, poor adhesion, and other flaws while also increasing the service life and dependability of dual-phase steel.

Benefits of Hot-Dip Galvanized Duplex Steel:

• Enhanced Corrosion Resistance:

The zinc coating offers excellent protection against corrosion, while the duplex steel structure gives additional corrosion resistance, particularly in harsh environments such as marine or industrial settings.

• High Strength:

Duplex steel is stronger than regular stainless steel and offers better resistance to stress corrosion cracking. This makes it suitable for demanding applications.

• Durability:

The combination of duplex steel and galvanization increases the material's lifespan by offering strong protection against corrosion and wear, even in aggressive environments.

Application Cases At Home And Abroad

Around the world, many well-known automobile manufacturers have used duplex steel to manufacture auto parts. Gac Fiat Viaggio, for example, uses high-strength biphase steel to form the engine compartment front longitudinal beam, which absorbs more collision energy while maintaining maximum bearing capacity. General Motors, Ford Company, Beijing Jeep, Bora Motors, Italy's Texide Company, etc., more or less use dp steel to manufacture spokes or wheels. These application cases fully demonstrate the wide applicability and excellent performance of duplex steel in the automotive industry.

To sum up, the application of duplex steel in the automotive industry is very wide, covering body structure parts, airbags, engine parts, braking systems, fuel systems, and other aspects. With the continuous progress of technology and the deepening of application, the position of duplex steel in the automotive industry will be more and more important.