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

CN109972023AActive Publication Date: 2019-07-05WUHAN UNIV OF SCI & TECH
3 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-07-05

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Examples

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.