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Boron micro-alloying low-carbon two-phase steel produced by hot continuous rolling process and its preparation method

Inactive Publication Date: 2010-09-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The low-temperature coiling method has low alloy cost, but requires fast cooling rate, and low coiling temperature (≤200°C) requires very strict equipment and processes, making it difficult to achieve industrialized mass production

Method used

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  • Boron micro-alloying low-carbon two-phase steel produced by hot continuous rolling process and its preparation method
  • Boron micro-alloying low-carbon two-phase steel produced by hot continuous rolling process and its preparation method
  • Boron micro-alloying low-carbon two-phase steel produced by hot continuous rolling process and its preparation method

Examples

Experimental program
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Embodiment Construction

[0025] The results of some examples are listed below. The three components are smelted in a vacuum furnace. After demoulding, they are directly put into the heating furnace, heated for 25 minutes, and the furnace temperature is controlled to 1100°C. Each component is rolled into two specifications, and the composition process and properties are shown in Tables 2-4.

[0026] Table 2 embodiment measured chemical composition (weight fraction %, all the other are Fe)

[0027] instance number

[0028] instance number

[0029] Table 3 embodiment measured process parameter

[0030] example

[0031] Table 4 embodiment measured performance

[0032] example

[0033] It can be seen from Figure 1 that the ferrite exists in the form of polygons in the duplex structure, and the martensite is distributed between the ferrites in the form of islands; it can be seen from Figure 2 that after being corroded by Lepera reagent, the martensite is bright white...

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Abstract

The invention provides boron micro-alloyed low-carbon dual-phase steel produced through a hot continuous rolling process and a method for preparing the same, relating to a technology for preparing hot-rolled dual-phase steel with the tensile strength between 540 and 700 MPa. Boron with the weight percentage of between 0.0005 and 0.0040 is added into low-carbon dual-phase steel, so as to improve the hardenability of the steel and inhibit the formation of bainite. A preparation process comprises the following steps that: molten steel in accordance with a set composition control range is smeltedthrough a smelting furnace and cast into an ingot blank; after the ingot blank is heated or soaked, hot rolling, first-stage cooling (air cooling or wind cooling), second-stage fast cooling (laminar cooling) and coiling are carried out to the ingot blank, and then an obtained steel plate has high mechanical property, good n and r values and good welding performance. The method greatly improves technological tolerance and can realize the large scale production of the dual-phase steel.

Description

technical field [0001] The invention relates to the field of production and preparation of hot-rolled dual-phase steels with a tensile strength of 540-700 MPa, in particular to the metallurgical technology for producing boron microalloyed low-carbon dual-phase steel plates by a hot continuous rolling process. Background technique [0002] Hot-rolled dual-phase steel is an ideal material for the production of automotive panels, automotive structural parts, and automotive and mechanical steels that require good formability. With the development of my country's economy and the rapid growth of the automobile industry, dual-phase steel plays a very important role in reducing weight, reducing consumption, improving safety, manufacturing high-strength and toughness stamping components and simplifying the stamping process. Medium and high strength duplex steel refers to R m ≥540MPa dual-phase steel, this type of steel is mainly used in the manufacture of high-strength structural pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C33/04B21B37/74
Inventor 康永林关建东温德智吴光亮韩启航
Owner UNIV OF SCI & TECH BEIJING
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