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A ferritic bainite advanced high-strength steel plate and its manufacturing method

A high-strength steel plate and a manufacturing method technology, applied in the field of advanced high-strength steel plates, can solve the problems of reduced rolling line production efficiency, complex production process, high Nb content, and achieve excellent cold bending performance, high cost advantage, and improved strength.

Active Publication Date: 2016-08-03
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many alloy elements added, and the production process is complicated. After rolling, it needs to be air-cooled and wait for 20-100s, which greatly reduces the production efficiency of the rolling line, and the content of Nb added in the composition is relatively high.

Method used

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  • A ferritic bainite advanced high-strength steel plate and its manufacturing method
  • A ferritic bainite advanced high-strength steel plate and its manufacturing method
  • A ferritic bainite advanced high-strength steel plate and its manufacturing method

Examples

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Embodiment 1

[0047] Example 1 The molten steel smelted according to the proportions in Table 3 is vacuum degassed and then continuously cast or die casted. The thickness of the slab is 100mm. After multiple passes of rolling within the range, it is rolled into a steel plate with a thickness of 2mm, the total reduction rate is 98%, and the final rolling temperature is 840°C, then water-cooled at 100°C / s to 650°C for 4 seconds, and then cooled at 70°C / s sWater cooled to 450°C Air cooled to room temperature without tempering.

[0048] The detailed components and process parameters of Examples 2-5 are shown in Table 3 and Table 4. The implementation process is similar to that of Example 1. Tempering treatment is required in Examples 4 and 5. The properties of the steel plates obtained in all examples are shown in Table 5. . The metallographic structure of part of the steel plate of the embodiment of the present invention is as follows: figure 1 , figure 2 and image 3 shown.

[0049] Tab...

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Abstract

The invention discloses a ferrite bainite advanced high strength steel plate. The main components of the steel plate comprises, in percent by weight: 0.05-0.10 of C, 0.35-1.55 of Si, 1.52-1.85 of Mn, not more than 0.015 of P, not more than 0.005 of S, 0.015-0.040 of Al, not more than 0.006 of N, and the balance being iron and unavoidable impurities. A manufacturing method for the steel plate comprises: after heating a steel blank at the temperature of 1100-1200 DEG C, performing multipass rolling by a strip rolling mill or a heavy plate rolling mill, wherein the total reduction rate is not less than 70%, and the final rolling temperature is not less than 840 DEG C; after rolling, carrying out segmented cooling: at a first segment of cooling, rapidly cooling to 650-700 DEG C at a water cooling speed of 50-100 DEG C / s, then holding an air cooling time for 3-5 s at the temperature, and then carrying out a second segment of cooling at a water cooling speed of not less than 30 DEG C / s, wherein the final cooling temperature is 450-550 DEG C; and carrying out air cooling of the final cooled steel plate to the room temperature.

Description

technical field [0001] The invention relates to an advanced high-strength steel plate, in particular to an advanced high-strength steel plate whose structure is ferrite and bainite and a manufacturing method thereof. The steel plate has good forming, hole reaming, cold bending and low-temperature impact toughness, and can be used in industries such as automobiles and construction machinery. Background technique [0002] As an important steel material, advanced high-strength steel is widely used in industries such as automobiles and construction machinery. With the rapid development of my country's automobile, construction machinery and other industries, as well as the complexity, large-scale and lightweight of various military and civilian equipment, higher requirements are put forward for this type of steel, that is, advanced high-strength steel used to manufacture these equipment Steel plates not only require higher hardness and strength, but also require good forming, hol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/14C22C38/12
Inventor 张爱文焦四海
Owner BAOSHAN IRON & STEEL CO LTD
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