Continuous annealing low-alloy and high-strength steel plate and production method thereof

A low-alloy, high-strength, production method technology, applied in the field of metal materials, can solve problems such as difficult control, fluctuations in material performance, and unfavorable material shaping, and achieve the effects of ensuring surface quality, improving material strength, and good shaping

Inactive Publication Date: 2016-06-29
TANGSHAN IRON & STEEL GROUP
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AI Technical Summary

Problems solved by technology

Traditional micro-alloyed high-strength steels all contain Ti. As described in the continuous annealing process of cold-rolled low-alloy high-strength steel plates with a yield strength of 420MPa (authorized announcement number: CN102492823B),

Method used

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  • Continuous annealing low-alloy and high-strength steel plate and production method thereof

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Experimental program
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Effect test

Embodiment 1－8

[0025] Embodiments 1-8: The continuous annealed low-alloy high-strength steel plate adopts the following composition ratio and the following production process.

[0026] (1) The composition ratio of each embodiment is shown in Table 1.

[0027] Example

[0028] In Table 1, the balance is iron and unavoidable impurities.

[0029] (2) The steel billet undergoes hot rolling, cold rolling, annealing and tempering processes to obtain the high-strength steel plate. The process parameters of the hot rolling and cold rolling process in each embodiment are shown in Table 2, and the process parameters of the annealing and tempering process are shown in Table 3.

[0030] Example

[0031] Table 3: Process parameters for annealing and tempering steps

[0032]

[0033] The thickness in Table 3 refers to the thickness of the steel strip obtained in the annealing process.

[0034] (3) The mechanical properties of the high-strength steel plates obtained in each embodi...

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Abstract

A continuous annealing low-alloy high-strength steel plate and a production method thereof, the mass percentages of the components are: C 0.06-0.10%, Si ≤ 0.50%, Mn 0.6-1.2%, P ≤ 0.025%, S ≤ 0.025%, N≤50ppm, Als 200~500ppm, Nb 0.030‑0.060%, the rest is iron and unavoidable impurities. This high-strength steel plate adopts a low-carbon design, and the strength of the material is enhanced through Si and Mn solid-solution strengthening. Through separate Nb microalloying, while improving the material strength, it still maintains a good shape; this high-strength steel plate does not use Ti element. Micro-alloying is beneficial to the stability of finished product performance; the high-strength steel plate has good strength, plasticity and formability. This method adds an appropriate amount of Si element to purify the ferrite matrix, so that the obtained steel has a good shape. At the same time, combined with the relevant continuous annealing process parameters, the material has continuous yield characteristics, ensuring that the user The surface quality of the product.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a continuous annealing low-alloy high-strength steel plate and a production method thereof. Background technique [0002] With the improvement of automobile safety performance requirements, more and more high-strength steels with good strength and plasticity are used in the manufacture of automobile bodies. On the one hand, the weight of the car body can be reduced without losing the safety performance of the car; on the other hand, the fuel consumption of the car can be reduced and the environmental pollution can be reduced; therefore, high-strength steel is used more and more in the manufacture of car bodies, especially in some safety parts and structures piece production. However, the traditional microalloyed high-strength steel is still widely used in the manufacture of auto parts due to its good yield ratio and weldability. And other microalloying elements to improve the str...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02C21D1/26
CPCC22C38/02C21D1/26C21D8/0221C21D8/0273C22C38/04C22C38/06C22C38/12
Inventor 夏明生于世川刘立学张茜孙良博史文刘丽萍王建兴李桂兰邢振环解鸽
Owner TANGSHAN IRON & STEEL GROUP
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