What is quenched ductile steel CR600/980QPD+Z?

CR600/980QPD+Z is a quenched ductile steel, usually used to manufacture structural parts with high strength, high wear resistance and high corrosion resistance, such as vehicle frames, wheels, steel plate bending parts and construction machinery, etc. Some parameters in their names have the following meanings:

CR: Indicates that this is a cold rolled steel.

600/980: It means that the yield strength of this steel is 600MPa and the tensile strength is 980MPa.

QP: Indicates that this is a heat-treated steel, where “Q” indicates quenching treatment, and “P” indicates phase transformation treatment.

D: Indicates that this steel is produced in a hot-dip galvanizing process with zinc.

+Z: Indicates that the steel has been surface treated, that is, hot-dip galvanized.

What is the chemical composition of quenched ductile steel CR600/980QPD+Z?

Carbon (C): 0.12-0.18%

Silicon (Si): ≤0.50%

Manganese (Mn): 1.20-1.60%

Phosphorus (P): ≤0.025%

Sulfur (S): ≤0.015%

Chromium (Cr): ≤0.30%

Nickel (Ni): ≤0.30%

Copper (Cu): ≤0.25%

Vanadium (V): 0.05-0.12%

Niobium (Nb): 0.03-0.06%

Titanium (Ti): ≤0.20%

Aluminum (Al): ≤0.040%

The sum of other residual elements: ≤0.20%

What are the characteristics of quenched ductile steel CR600/980QPD+Z?

High strength: CR600/980QPD+Z has a yield strength of 600MPa and a tensile strength of 980MPa, which is much higher than that of general structural steel and can withstand greater loads.

Good ductility: This steel has good ductility and can retain its shape during processing such as bending and stamping.

Excellent fatigue resistance: CR600/980QPD+Z has good fatigue resistance and can maintain its strength and toughness after long-term use.

Good corrosion resistance: Because its surface has been hot-dip galvanized, it has good corrosion resistance and can be used in harsh environments.

Excellent wear resistance: This steel has been quenched, has high hardness and wear resistance, can be used under high load, and prolongs the service life.

How is quenched ductile steel CR600/980QPD+Z manufactured?

The manufacturing process of quenched ductile steel CR600/980QPD+Z usually includes the following steps:

Raw material selection: Select high-quality steel with low carbon content and less impurity content as raw materials.

Smelting: put raw materials into electric arc furnace or converter for smelting, and at the same time add a certain amount of alloying elements (such as vanadium, niobium, titanium, etc.) to improve the strength and toughness of steel.

Refining: Through vacuum refining or converter refining and other processes, impurity elements in molten steel are removed to further improve the purity and uniformity of steel.

Continuous casting: casting the refined molten steel into continuous casting slabs.

Rolling: The continuous casting slab is heated to an appropriate temperature, then rolled and cooled to make coils or plates.

Quenching treatment: The rolled steel is heated to an appropriate temperature, and then quenched to achieve high strength and good ductility.

Surface treatment: Surface treatment of quenched steel, usually by hot-dip galvanizing process, covering a layer of zinc on the surface of the steel to improve the corrosion resistance of the steel.

Is quenched ductile steel CR600/980QPD+Z a galvanized steel?

Yes, quenched ductile steel CR600/980QPD+Z is usually hot-dip galvanized steel, which is coated with a layer of zinc on the surface. Hot-dip galvanizing is a commonly used surface treatment method, which can form a dense and uniform zinc layer on the surface of steel, improve the corrosion resistance of steel, and prevent the surface of steel from being oxidized and corroded. Therefore, CR600/980QPD+Z quenched ductile steel has good corrosion resistance and can be used in harsh environments.

Is quenched ductile steel CR600/980QPD+Z cold rolled or hot rolled?

Quenched ductile steel CR600/980QPD+Z can be manufactured either by hot rolling or cold rolling. However, under normal circumstances, CR600/980QPD+Z steel is manufactured by hot rolling, because hot rolling can improve the plasticity and ductility of steel, making it more suitable for quenching. In the hot rolling process, the steel is heated, rolled, cooled and other processes, which can make it reach a certain degree of plasticity and ductility, so that it is easier to quench and improve the strength and ductility of the steel. However, if customers have special requirements, CR600/980QPD+Z steel can also be manufactured by cold rolling.

How is quenched ductile steel CR600/980QPD+Z quenched?

Quenched ductile steel CR600/980QPD+Z is generally quenched by water quenching or oil quenching.

Before quenching, the steel needs to be heated to an appropriate temperature first, and then quickly put into a cooling medium (such as water or oil) to rapidly form a martensite structure on the surface of the steel. Due to the fast quenching speed, the structure of the steel undergoes a phase transformation, thereby obtaining high strength and ductility.

It should be noted that the selection of quenching temperature and quenching medium for CR600/980QPD+Z steel should be reasonably selected and adjusted according to the specific material composition, process conditions and use requirements, so as to ensure that the steel can obtain good quenching effect and performance.

How is quenched ductile steel CR600/980QPD+Z used as automotive steel?

Quenched ductile steel CR600/980QPD+Z is a high-strength, high-ductility steel, making it ideal for use as automotive steel. In automobile manufacturing, CR600/980QPD+Z steel is usually used to manufacture body structural parts, such as doors, hoods, trunk lids, roofs, body supports and other parts. The use of CR600/980QPD+Z steel can make the body structure more lightweight, while improving the rigidity and strength of the body, thereby improving the driving performance and safety performance of the car.

In addition,CR600/980QPD+Z steel also has excellent welding performance and surface treatment performance, and can be well bonded and painted with other materials, which improves the appearance and texture of the car.

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