Ultralow-carbon high-strength high-plasticity martensitic steel and preparation method thereof

A martensitic steel, high-strength technology, applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of steel strength limitation, welding performance and easy processing performance hazards, etc., to improve strength and plasticity, and a wide range of applications , the effect of good weldability

Active Publication Date: 2021-07-30
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of high-strength steel preparation, the effect of the strengthening method on the material is decisive. The strengthening method of traditional high-strength steel mainly relies on solid solution strengthening of carbon and precipitation strengthening of alloy carbides. The strength of steel has a linear relationship with the content of carbon. When When the strength reaches a certain level, the carbon content also increases, which has great harm to the welding performance and easy processing performance. In the acceptable range of welding ability, the strength of steel is greatly limited.

Method used

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  • Ultralow-carbon high-strength high-plasticity martensitic steel and preparation method thereof
  • Ultralow-carbon high-strength high-plasticity martensitic steel and preparation method thereof
  • Ultralow-carbon high-strength high-plasticity martensitic steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An ultra-low-carbon high-strength high-plasticity martensitic steel, the chemical composition mass percentage of the martensitic steel is: C: 0.05%, Si: 0.25%, Mn: 0.58%, Cr: 1.10%, Cu: 2.4%, Ni: 10.36%, V: 0.13%, Mo: 0.78%, Al: 0.41%, P: ≤0.02%, S: ≤0.02%, and the balance is Fe;

[0038] The microstructure of the martensitic steel is lath block martensite;

[0039] The preparation method of the above-mentioned a kind of ultra-low carbon high-strength high-plasticity martensitic steel comprises the following steps:

[0040] Step 1: According to the chemical composition ratio of martensitic steel, first add metal nickel plate, industrial pure iron, metal molybdenum, and metal chromium into the smelting furnace in turn, and smelt at 1490°C until the charge is fully melted, and then add industrial steel in turn. Silicon, metal manganese, copper, aluminum, vanadium iron, graphite, continue to smelt until the charge is fully melted, and finally cast into steel ingots;

[0...

Embodiment 2

[0053] An ultra-low-carbon high-strength high-plasticity martensitic steel, the chemical composition mass percentage of the martensitic steel is: C: 0.04%, Si: 0.27%, Mn: 0.60%, Cr: 1.00%, Cu: 2.25%, Ni: 10.26%, V: 0.14%, Mo: 0.80%, Al: 0.40%, P: ≤0.02%, S: ≤0.02%, and the balance is Fe;

[0054] The microstructure of the martensitic steel is lath block martensite;

[0055] The preparation method of the above-mentioned a kind of ultra-low carbon high-strength high-plasticity martensitic steel comprises the following steps:

[0056] Step 1: According to the chemical composition ratio of martensitic steel, first add metal nickel plate, industrial pure iron, metal molybdenum, and metal chromium into the smelting furnace in turn, melt at 1500 ° C until the charge is fully melted, and then add industrial Silicon, metal manganese, copper, aluminum, vanadium iron, graphite, continue to smelt until the charge is fully melted, and finally cast into steel ingots;

[0057] The industri...

Embodiment 3

[0069] An ultra-low-carbon high-strength high-plasticity martensitic steel, the chemical composition mass percentage of the martensitic steel is: C: 0.02%, Si: 0.24%, Mn: 0.57%, Cr: 1.11%, Cu: 3.47%, Ni: 10.33%, V: 0.12%, Mo: 0.77%, Al: 0.42%, P: ≤0.02%, S: ≤0.02%, and the balance is Fe;

[0070] The microstructure of the martensitic steel is lath block martensite;

[0071] The preparation method of the above-mentioned a kind of ultra-low carbon high-strength high-plasticity martensitic steel comprises the following steps:

[0072] Step 1: According to the chemical composition ratio of martensitic steel, first add metal nickel plate, industrial pure iron, metal molybdenum, and metal chromium into the smelting furnace in turn, and smelt at 1490°C until the charge is fully melted, and then add industrial steel in turn. Silicon, metal manganese, copper, aluminum, vanadium iron, graphite, continue to smelt until the charge is fully melted, and finally cast into steel ingots;

[...

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Abstract

The invention relates to ultralow-carbon high-strength high-plasticity martensitic steel and a preparation method thereof, and belongs to the field of steel preparation. The martensitic steel comprises the following chemical components in percentage by mass: 0.01-0.05% of C, 0.2-0.5% of Si, 0.5-0.8% of Mn, 0.8-1.2% of Cr, 2.0-4.0% of Cu, 10.0-11.0% of Ni, 0.05-0.15% of V, 0.5-0.9% of Mo, 0.2-0.5% of Al, less than or equal to 0.02% of P, less than or equal to 0.02% of S and the balance of Fe. The elements of Cu, Ni, Al and Mn are added into the alloy, and Cu and Ni3Al (Mn)-rich phases can be separated out in the aging heat treatment process, so that the high strength of the alloy is achieved, and meanwhile the welding performance is excellent. The martensitic steel does not need rolling, subzero treatment and the heat treatment process are simple, the production efficiency is high, and implementation is easy.

Description

technical field [0001] The invention belongs to the field of steel preparation, in particular to an ultra-low-carbon, high-strength, high-plasticity martensitic steel and a preparation method thereof. Background technique [0002] With the continuous development of modern science and technology, the application fields of high-strength steel are constantly expanding, and people's pursuit of steel performance is also constantly improving. In the field of high-strength steel preparation, the effect of the strengthening method on the material is decisive. The strengthening method of traditional high-strength steel mainly relies on solid solution strengthening of carbon and precipitation strengthening of alloy carbides. The strength of steel has a linear relationship with the content of carbon. When When the strength reaches a certain level, the carbon content also increases, which has great harm to the welding performance and easy processing performance. Under the acceptable ran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C21D1/18C21D1/78C21D6/00C21D9/00C22C33/06
CPCC22C38/02C22C38/04C22C38/42C22C38/46C22C38/44C22C38/06C22C33/06C21D1/18C21D1/78C21D9/0081C21D9/0075C21D6/004C21D6/005C21D6/008C21D2211/008
Inventor 董艳伍彭飞田家龙姜周华
Owner NORTHEASTERN UNIV
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