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Cold-rolled hot-galvanized duplex steel and manufacturing method thereof

A manufacturing method, hot-dip galvanizing technology, applied in the direction of manufacturing tools, hot-dip galvanizing process, heat treatment furnace, etc., can solve the problems of increasing the content of alloy elements, affecting the welding performance of materials, and increasing the production cost of products, so as to reduce the content and improve the production cost. Product welding performance, the effect of simplifying production management

Active Publication Date: 2019-08-06
CISDI ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a cold-rolled hot-dip galvanized dual-phase steel and its manufacturing method, which is used to solve the problem of the alloy element content of the cold-rolled hot-dip galvanized dual-phase steel in the prior art. The increase will increase the production cost of the product, and at the same time affect the welding performance of the material, causing a large number of missing plating on the surface of the steel plate and other problems

Method used

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  • Cold-rolled hot-galvanized duplex steel and manufacturing method thereof
  • Cold-rolled hot-galvanized duplex steel and manufacturing method thereof
  • Cold-rolled hot-galvanized duplex steel and manufacturing method thereof

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Effect test

Embodiment 1

[0040] Tensile strength 590MPa grade dual-phase steel chemical composition mass percentage (wt.%) is: C: 0.09%, Mn: 1.55%, S: 0.010%, P: 0.015%, Si: 0.35%, Als: 0.04%, Cr : 0.50%, N: 0.006%, and the balance is Fe and impurities.

[0041] The hot rolling process is as follows: the slab heating temperature is 1250°C, the finish rolling temperature is 1000°C, the final rolling temperature is 850°C, and the coiling temperature is 600°C.

[0042] The reduction rate of cold rolling is 60%, and the cold strip steel is obtained, which enters the subsequent continuous annealing process.

[0043] The continuous annealing process parameters are shown in Table 1.

[0044] Table 1

[0045]

[0046]

[0047] The mechanical properties of the above cold-rolled hot-dip galvanized dual-phase steel after continuous annealing are shown in Table 2.

[0048] Table 2

[0049]

[0050] image 3 It shows the microstructure of the finished dual-phase steel with a tensile strength of 590MP...

Embodiment 2

[0052]Tensile strength 780MPa grade dual-phase steel chemical composition mass percentage (wt.%) is: C: 0.16%, Mn: 1.75%, S: 0.010%, P: 0.020%, Si: 0.35%, Als: 0.04%, Cr : 0.55%, N: 0.006%, Ti: 0.02%, and the balance is Fe and impurities.

[0053] The hot rolling process is as follows: the slab heating temperature is 1220°C, the finish rolling temperature is 1000°C, the final rolling temperature is 860°C, and the coiling temperature is 620°C.

[0054] The reduction ratio of cold rolling is 55%, and the cold strip steel is obtained, which enters the subsequent continuous annealing process.

[0055] The continuous annealing process parameters are shown in Table 3.

[0056] table 3

[0057]

[0058]

[0059] The mechanical properties of the cold-rolled hot-dip galvanized dual-phase steel after continuous annealing are shown in Table 4.

[0060] Table 4

[0061]

[0062] Figure 4 It shows the microstructure of the finished dual-phase steel with a tensile strength of...

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Abstract

The invention provides cold-rolled hot-galvanized duplex steel and a manufacturing method thereof. The method comprises the following steps: 1) cold-state strip steel is heated to 780-840 DEG C; 2) the heated strip steel is insulated within 780-840 DEG C by 50-120 s; 3) the insulated strip steel is cooled to 650-730 DEG C; 4) the strip steel cooled to 650-730 DEG C is quickly cooled below the martensite transformation temperature (Ms point), and is insulated by above 3 s; and the quick cooling speed is not lower than 30 DEG C / s; and 5) the insulated strip steel cooled below the Ms point is heated to the galvanizing temperature of 450-470 DEG C. The martensite quenching phase is arranged in the continuous annealing quick cooling phase, so that the strength, the plasticity and the punching performances of the cold-rolled hot-galvanized duplex steel product meet the requirements; the production cost is reduced; the welding performances of the product are improved; the generality of continuous hot-galvanized and continuous annealing duplex steel raw materials is achieved; and the production management is simplified.

Description

technical field [0001] The invention relates to the technical field of dual-phase steel production, in particular to a cold-rolled hot-dip galvanized dual-phase steel and a manufacturing method thereof. Background technique [0002] In recent years, the rapid development of my country's economy has greatly stimulated the development of the automobile industry, and the development of the automobile industry has also greatly stimulated the demand for cold-rolled sheets. Automobile production and sales have experienced rapid growth for many years, and are currently showing a steady growth trend. In the future, the focus of competition in the auto industry will shift from increasing production to improving product quality. Energy saving, environmental protection, safety, comfort and intelligence are the key factors in the development of automotive technology in the world today. general trend. Cold-rolled hot-dip galvanized dual-phase steel is composed of two phases of ferrite a...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D1/26C23C2/02C23C2/06C23C2/40C22C38/04C22C38/38C22C38/02C22C38/06C22C38/18C22C38/28C21D8/02
CPCC21D1/26C21D8/0226C21D8/0236C21D9/52C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/18C22C38/28C22C38/38C23C2/02C23C2/06C23C2/40
Inventor 夏强强余晨韵王业科辜蕾钢
Owner CISDI ENG CO LTD
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