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Bainite steel with high strength and elongation and preparation method and application of bainite steel

A technology of bainite steel and high-strength plastic product, which is applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of long production process, high-strength plastic product cannot be achieved, and high production cost

Active Publication Date: 2019-07-05
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microstructure of the above-mentioned steel types is mainly multi-phase microstructure, which requires complex and precise process control to ensure uniform microstructure and properties, and the production process is long and the production cost is high.
High-carbon bainitic steel has good comprehensive properties, and at the same time has both appropriate plasticity and toughness, and has received more and more attention. The level of advanced high-strength steel
In addition, the existing high-carbon bainitic steels are generally thick plates (thickness is generally greater than 10mm), which are mainly used in the fields of armor steel, bulletproof steel plate and bearing steel, and have high strength and plasticity and can be used in Thin-gauge high-carbon bainitic steels for safety components in vehicles such as automobiles have rarely been reported

Method used

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  • Bainite steel with high strength and elongation and preparation method and application of bainite steel
  • Bainite steel with high strength and elongation and preparation method and application of bainite steel
  • Bainite steel with high strength and elongation and preparation method and application of bainite steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The main process flow of the preparation method of the bainite steel with high strength and plastic product provided in this example is as follows: hot metal desulfurization→converter blowing→argon blowing→refining→thin slab continuous casting→soaking→seven-stand finish rolling→layer Flow cooling → coiling → primary annealing → secondary annealing. Among them, the processes of molten iron removal, sulfur converter blowing and argon blowing are conventional technologies.

[0054] The rest of the process steps are as follows:

[0055] (1) The chemical composition range of molten steel after alloying treatment in the refining process is C: 0.846-1.072%, Si: 1.13-1.59%, Mn: 1.97-2.23%, P: ≤0.012%, S: ≤0.005%, Cr: 1.58-1.79%, Ni: 1.37-1.58%, Ti: 0.185-0.213%, Mo: 0.48-0.53%, V: 0.38-0.49%, N: ≤0.005%, and the rest are Fe and unavoidable impurities.

[0056] In this embodiment, the chemical composition range of molten steel is C: 0.846%, Si: 1.43%, Mn: 2.22%, P: ≤0.008%, S:...

Embodiment 2-10

[0076] The preparation method of the high-strength bainitic steel provided in Examples 2-10 is basically the same as that of Example 1, except that the content of elements and related parameters are different. See Table 1 and Table 2 for the differences.

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Abstract

The invention discloses bainite steel with high strength and elongation and a preparation method and application of the bainite steel, and relates to the technical field of steel preparing. The bainite steel with high strength and elongation is prepared from the chemical components in percentage by weight: 0.846% to 1.07% of C, 1.13% to 1.59% of Si, 1.97% to 2.23% to Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 1.58% to 1.79% of Cr, 1.37% to 1.58% of Ni, 0.185% to 0.213% of Ti, 0.48% to 0.53% of Mo, 0.38% to 0.49% of V, less than or equal to 0.005% of N, and the balance of Fe and inevitable impurities. The bainite steel has better mechanical performance, such as greater than or equal to 2237 MPa of yield strengthen, greater than or equal to 2523 MPa of tensilestrengthen, greater than or equal to 15.2% of ductility, and greater than or equal to 38.49 GPa.% of high strength and elongation.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a bainite steel with high strength and plasticity, a preparation method and application thereof. Background technique [0002] In recent years, the rapid development of advanced high-strength steels has enabled steel materials to have a good match between strength and ductility, and still have good formability under high strength. At present, the first generation of advanced high-strength steels with strong plasticity (15-20) GPa·% (strong plasticity = tensile strength × total elongation), such as dual-phase (DP) steel, transformation-induced plasticity (TRIP) Steel, multi-phase steel, martensitic steel, etc. This type of steel has the advantages of high weight reduction potential, high impact absorption energy, high formability and low plane anisotropy, etc., and has been widely used in automobiles , which plays a very important role in the lightweight of the car. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21D1/26C21D6/00C21D8/02C21D9/52C22C38/02C22C38/34C22C38/44C22C38/46C22C38/50C22C38/58
CPCC21D1/26C21D6/004C21D6/005C21D6/008C21D8/0226C21D9/52C22C33/04C22C38/001C22C38/002C22C38/02C22C38/34C22C38/44C22C38/46C22C38/50C22C38/58
Inventor 徐光袁清甘晓龙万响亮邹航胡海江田俊羽刘升
Owner WUHAN UNIV OF SCI & TECH
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