CR780/980CH high plasticity composite phase steel is a high strength steel material for automobiles. It consists of regions of two or more different crystal structures in the steel, called “phases”. The high strength and ductility of the steel could help automakers reduce body weight, improve fuel efficiency and reduce carbon dioxide emissions while maintaining safety performance.

What is the chemical composition of CR780/980CH high plasticity composite phase steel?

Carbon (C): 0.15% – 0.22%

Silicon (Si): ≤0.5%

Manganese (Mn): 1.5% – 2.5%

Phosphorus (P): ≤0.03%

Sulfur (S): ≤0.025%

Chromium (Cr): ≤0.1%

Nickel (nickel): ≤0.3%

Iron (molybdenum): ≤0.05%

Copper (Cu): ≤0.3%

Tin (Ti): ≤0.15%

Aluminum (Al): ≤0.02%

What are the mechanical properties of CR780/980CH high plasticity composite phase steel?

The mechanical properties of CR780/980CH high plasticity complex phase steel will vary from manufacturer to manufacturer, but generally have the following characteristics:

High Strength: Its yield strength is usually in the range of 780 MPa to 980 MPa.

High toughness: This steel generally has high ductility and cold-bendability, and can withstand large deformations without cracking.

Good formability: The steel has good formability and can be used for deep drawing and complex forming processes.

Excellent Weldability: The steel can be joined by standard industrial welding methods without embrittlement or cracking in the welded area.

What are the advantages and disadvantages of CR780/980CH high plasticity composite phase steel?

CR780/980CH high plasticity complex phase steel has the following advantages:

High strength: Compared with traditional automotive steel, CR780/980CH high plasticity composite phase steel has higher yield strength and tensile strength.

High plasticity: The steel can withstand large deformation without cracking, and has good ductility and cold forming properties.

Lighter weight: Due to its high strength, automakers can use less steel to keep the body safe, thus reducing overall vehicle weight, improving fuel efficiency and reducing CO2 emissions.

Reduced waste material: Since less steel is used, less waste material is produced, which is beneficial to environmental protection.

Good weldability: The steel can be joined by standard industrial welding methods without problems such as embrittlement or cracking in the welded area.

The disadvantages are as follows:

Higher cost: Compared with traditional automotive steel, the cost of CR780/980CH high-plasticity multiphase steel may be higher, which will affect the production cost and product price of automakers.

High technical threshold: The manufacturing technology of this steel is relatively new, and requires a high level of production technology and related equipment investment.

How is CR780/980CH high plasticity composite phase steel manufactured?

The manufacturing process of CR780/980CH high plasticity composite phase steel usually includes the following steps:

Steel plate rolling: First, the raw material is heated to a certain temperature, and then pressed and plastically deformed by a rolling mill to obtain the required plate.

Phase change treatment: The sheet is heated to a high temperature and then rapidly cooled (e.g. water quenched) so that it forms regions (phases) of different crystal structures. This process is called “phase transition”.

Annealing treatment: reheat at a lower temperature, and adjust the grain size and structure through different parameters such as holding time, holding temperature and cooling rate, so as to improve the uniformity and formability of the steel.

Other Treatments: Depending on the application requirements, additional treatments such as heat treatment, surface treatment or coating of the steel may be required.

How is CR780/980CH high plasticity composite phase steel heat treated?

Heat treatment is an important process step of CR780/980CH high plasticity multiphase steel, and its mechanical properties can be adjusted by changing the grain size and structure of the steel. Generally speaking, the heat treatment process of CR780/980CH high plasticity composite phase steel includes the following steps:

Heating: Heating the steel to a specific temperature range, usually between 800°C and 900°C, and keeping it for a certain period of time so that it reaches a uniform temperature.

Insulation: At a specific temperature, keep the steel for a certain period of time to keep it in a stable state for the next step.

Cooling: Rapidly cooling (“quenching”) steel to change its structure and increase its strength and hardness. The quenching agent can use media such as water, oil or air.

Tempering: In order to enhance the toughness and plasticity of the steel, it needs to be tempered, that is, the quenched steel is heated to a lower temperature, kept in a stable state for a certain period of time, and then slowly cooled. The tempering temperature is generally between 200°C and 400°C, and the selection of time and temperature needs to be adjusted according to the specific application requirements and the composition of the steel.

What are the uses of CR780/980CH high plasticity composite phase steel?

CR780/980CH high-plasticity composite phase steel is a high-strength, high-plasticity material used in automobile manufacturing, mainly used in the following aspects:

Body structure: The safety performance and comfort performance of a car are closely related to the body structure. The use of CR780/980CH high-plasticity composite phase steel can improve the strength and stability of the vehicle body, thereby improving the safety performance and stability of the vehicle.

Suspension system: High plasticity multiphase steel has excellent fatigue resistance and durability, so it is often used in automobile suspension systems and other parts that need to withstand a lot of shock and vibration.

Engine hood and chassis protection plate: CR780/980CH high plasticity composite phase steel can also be used in the manufacture of automobile engine hood and chassis protection plate to improve its impact resistance and deformation resistance.

Other parts: CR780/980CH high-plastic composite phase steel can also be used to manufacture other parts, such as door panels, wheels, doors, etc., to improve the safety, comfort and energy-saving performance of the vehicle.

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If you are looking for a high-strength, high-plasticity automotive material, then CR780/980CH high-plasticity composite phase steel can be your first choice. This steel has excellent mechanical properties and ductility, which can help automakers reduce overall vehicle weight, improve fuel efficiency and reduce carbon dioxide emissions, while ensuring the safety performance and stability of the body. It also has good formability and welding performance, and can be used to manufacture various auto parts to meet the needs of different application scenarios.

In addition, CR780/980CH high plasticity composite phase steel also has low production waste and high recyclability, which is beneficial to environmental protection and resource utilization. Although its price may be slightly higher than traditional steel, its performance advantages and environmental protection features can bring more commercial value and brand image to automakers. If you are an automobile manufacturer or a practitioner in related industries, I strongly recommend that you consider using CR780/980CH high-plasticity multiphase steel to improve product quality and market competitiveness.