CR820/1180QP is a high-strength low-alloy quenched ductile steel, which is usually used in the manufacture of automotive components, construction machinery and other structural components of heavy equipment.

This steel has high yield strength and tensile strength, and its hardness after quenching can reach about 280-340HB. At the same time, this steel type also has good ductility and toughness, and it is not easy to break when subjected to a large impact load.

In addition, CR820/1180QP steel also has good welding performance and can be joined with other materials. It also has high wear resistance and corrosion resistance, which can meet the needs of use in heavy-duty working environments.

What is the chemical composition of CR820/1180QP quenched ductile steel?

Carbon (C): 0.08-0.15%

Silicon (Si): 0.15-0.50%

Manganese (Mn): 1.20-1.60%

Phosphorus (P): ≤0.025%

Sulfur (S): ≤0.010%

Chromium (Cr): 0.20-0.50%

Molybdenum (Mo): 0.10-0.20%

Copper (Cu): ≤0.30%

Nickel (Ni): ≤0.30%

Vanadium (V): 0.02-0.10%

What are the properties of CR820/1180QP quenched ductile steel?

High strength: CR820/1180QP steel has high yield strength and tensile strength, which can meet the needs of high-strength structural components.

Excellent ductility and toughness: This steel has good ductility and toughness, and it is not easy to break when subjected to a large impact load.

Good quench hardening performance: the hardness of the steel after quenching can reach 280-340HB, which has good quench hardening performance.

Good wear resistance and corrosion resistance: CR820/1180QP steel also has high wear resistance and corrosion resistance, which is suitable for use in heavy-duty working environments.

Excellent welding properties: This steel has good welding properties and can be joined with other materials.

How is CR820/1180QP quenched ductile steel quenched?

CR820/1180QP quenched ductile steel is usually quenched by water quenching or oil quenching.

The quenching process is divided into three steps of heating, heat preservation and cooling. Specific steps are as follows:

Heating: Heat the steel to about 800-900°C and keep it for a certain period of time to make it evenly heated.

Heat preservation: keep the heated steel in the heating furnace for a certain period of time to make the temperature uniform.

Quenching: quickly put the heat-preserved steel into water or oil to cool it down quickly. In this way, the grains of the steel can be made finer, the hardness increased, and the strength improved, while maintaining its good ductility and toughness.

How is CR820/1180QP quenched ductile steel processed?

CR820/1180QP quenched ductile steel has high strength and excellent ductility and toughness, so the following points should be paid attention to during processing:

Choose the right cutting tool: Due to the high hardness of CR820/1180QP quenched ductile steel, it is necessary to choose a suitable carbide cutting tool during processing to ensure cutting efficiency and processing accuracy.

Maintain an appropriate cutting speed: CR820/1180QP quenched ductile steel has high hardness and strength, so it is necessary to maintain an appropriate cutting speed during processing to avoid excessive tool wear and low processing efficiency.

Appropriate cooling method: Since CR820/1180QP quenched ductile steel is prone to high temperature during processing, it is necessary to adopt appropriate cooling method to avoid excessive heat generation and improve processing accuracy and surface quality.

Pay attention to the selection of cutting fluid: When processing CR820/1180QP quenched ductile steel, it is necessary to select a suitable cutting fluid to improve processing efficiency and cutting quality, and protect cutting tools from excessive wear and oxidation.

Does CR820/1180QP quenched ductile steel need heat treatment?

Generally speaking, after CR820/1180QP quenched ductile steel is quenched, its hardness will increase significantly, but its ductility and toughness will decrease. Therefore, in order to restore its good ductility and toughness, it usually needs to be heat treated.

Common heat treatment methods include tempering and normalizing, and the specific treatment methods depend on the requirements of product use and manufacturing processes. Tempering treatment can be used to restore the toughness and ductility of CR820/1180QP steel, and normalizing treatment can be used to improve its strength and hardness.

It should be noted that the heat treatment process needs to be carried out within a specific temperature range and time to ensure product quality. At the same time, different manufacturers or steel products of different specifications may need to adopt different heat treatment processes, so adjustments should be made according to specific conditions in actual production.

Where is CR820/1180QP quenched ductile steel generally used in automobiles?

CR820/1180QP quenched ductile steel has high strength and excellent ductility and toughness, so it is widely used in automobile manufacturing. It is mainly used in high-strength, high-toughness and high-stability components such as automotive structural components, body safety components and chassis structural components.

Specifically, CR820/1180QP quenched ductile steel is often used in key parts of automobile body structures, such as B-pillars, C-pillars, side panels, etc., to improve the strength and safety of the body; it is also commonly used in the manufacture of chassis structural components, such as suspension Arms, wheel bearings, etc., to improve its load-bearing capacity and stability.

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