Titanium microalloyed high strength steel, preparation method and application thereof

A technology of micro-alloying and high-strength steel, which is applied in the field of solidification structure refinement of high-strength steel, and can solve problems such as coarse grains of high-strength steel

Inactive Publication Date: 2018-06-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem of coarse g...

Method used

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  • Titanium microalloyed high strength steel, preparation method and application thereof

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preparation example Construction

[0031] The preparation method of the titanium microalloyed high-strength steel comprises the following steps:

[0032] (1) mixing SAPH440 steel grade and pure iron for vacuum melting to obtain molten steel;

[0033] (2) refining the molten steel obtained in the step (1) to obtain refined molten steel;

[0034] (3) Add ferrosilicon, ferroniobium and metal manganese successively to the molten steel obtained in the step (2) for smelting, then add aluminum grains for deoxidation, and after deoxidation, add ferro-titanium alloy for alloying to obtain alloyed steel liquid;

[0035] (4) Cooling the molten alloyed steel obtained in the step (3) to obtain titanium microalloyed high-strength steel, and the cooling includes furnace cooling and pulse magnetic shock treatment.

[0036] In the titanium micro-alloyed high-strength steel provided by the present invention, the smaller TiC can be dispersed and precipitated in the iron matrix, which can produce a strong precipitation strengthe...

Embodiment 1

[0059] The titanium microalloyed high-strength steel prepared in this embodiment includes the following components in weight percentage according to the elemental composition:

[0060] 0.035% C, 0.1% Si, 1.46% Mn, 0.021% Nb, 0.112% Ti, the balance Fe.

[0061] The prepared steel raw material (steel type is SAPH440) is pretreated, and the pure iron block is removed with an angle grinder to remove scale. SAPH440 is dried and preheated in a heating furnace at a temperature of 500°C for 1 hour. It is then placed in a preconditioned vacuum induction furnace. Melting begins, and molten steel is obtained. The setting parameters and melting parameters in the pretreatment furnace are as follows:

[0062] Vacuum up to 20Pa before melting, start power transmission, power transmission power is 25kW, power supply is about 25min, and heat the furnace; when the power reaches 65kW during melting, power supply is 40min, and then the power continues to rise to 85kW, keep the power unchanged, ...

Embodiment 2

[0067] The titanium microalloyed high-strength steel prepared in this embodiment includes the following components in weight percentage according to the elemental composition:

[0068] 0.040% C, 0.12% Si, 1.50% Mn, 0.024% Nb, 0.115% Ti, the balance Fe.

[0069] The preparation method of this embodiment is basically the same as that of Example 1, the difference being that the process parameters of the magneto-oscillation treatment are:

[0070] The range of pulse frequency f is 2000Hz, the pulse voltage U is 5000V, and the peak value of pulse current I is 10 4 a.

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Abstract

Belonging to the technical field of solidified structure refinement of high strength steel, the invention provides a titanium microalloyed high strength steel. According to the invention, in the cooling process of alloyed molten steel, small size TiC can disperse and precipitate in an iron matrix, and can produce a strong precipitation strengthening effect, also the TiC and TiN precipitated by deformation induction can effectively pin grain boundaries and inhibit austenite recrystallization, thereby achieving a grain refining effect. Also pulse magneto oscillation treatment is carried out on amelt produced in the alloyed molten steel cooling process and induce oscillating electromagnetic force, the electromagnetic force on the one hand can reduce the internal temperature gradient of the melt to increase the nucleation area, and on the other hand can accelerate shedding of a crystal nucleus on the liquid level or at a solid-liquid interface and dissociation into the whole melt, thus forming a crystal shower effect refined metal solidified structure. Under the two synergistic effects, the obtained high strength steel has more excellent comprehensive properties, thereby expanding theapplication field.

Description

technical field [0001] The invention relates to the technical field of a method for refining the solidification structure of high-strength steel, in particular to a titanium microalloyed high-strength steel and its preparation method and application. Background technique [0002] In the 1920s, titanium began to be added to steel as a carbonitride forming element to improve the welding performance of steel. Because TiN has good high-temperature thermal stability, it can effectively inhibit the growth of austenite grains in the welding heat-affected zone. In the 1950s, Hall and Petch studied the relationship between grain size and mechanical properties, and pointed out that refining grains can improve both strength and toughness. In the 1960s, the research of Davenport et al. showed that low-alloy steel can form a certain volume fraction of nano-precipitated particles under suitable process conditions, resulting in an obvious precipitation strengthening effect. Titanium micr...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C33/06
CPCC22C38/02C22C33/06C22C38/04C22C38/12C22C38/14
Inventor 钟庆东陈串罗均鲁雄刚孙中渠蒲华燕彭艳谢少荣
Owner SHANGHAI UNIV
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