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Preparation method of high-strength medium-carbon low-alloy steel plate

An alloy steel plate, high-strength technology, applied in the field of materials, can solve the problems of not achieving the best combination of strong plasticity, lower hardness and tensile strength of experimental steel, unable to meet strength and plasticity, etc., and achieves strong applicability and high room temperature. Good tensile strength and plasticity

Inactive Publication Date: 2020-11-03
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chun-Ming Lin and others found that the increase of annealing temperature will increase the plasticity of the experimental steel, but it will lead to a decrease in the hardness and tensile strength of the experimental steel (LinC.M., Lu C.H., Effects of tempering temperature on microstructural evolution and mechanical properties of high-strength low-alloy D6AC plasma arc welds,Materials Science and Engineering A,2016,676(5):28-37)
Derming Lian tempered the D6AC steel, the yield strength increased from 400MPa to 1300MPa, and the elongation increased from 0.4% to 9% (LianD.Microstructure properties of tempered D6ac steel[J].Applied SurfaceScience, 2013, 264( JAN.1): 100-104), although the yield strength and tensile strength are high, but the plasticity is still very low, it has not reached the best combination of strong plasticity, and cannot meet the requirements of fields that require high strength and plasticity

Method used

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  • Preparation method of high-strength medium-carbon low-alloy steel plate
  • Preparation method of high-strength medium-carbon low-alloy steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Molten steel is smelted according to the composition of D6A steel, smelted under protective atmosphere conditions, and cast into an ingot with original coarse grains; the microstructure of the ingot is ferrite and pearlite, the grain size is 15-25 μm, and the yield strength is 390± 5MPa, tensile strength 750±5MPa, elongation 22±0.5%;

[0032] Heat the ingot to 1200±50°C, keep it warm for 120 minutes for solution treatment, and then carry out 6 passes of hot rolling. The starting temperature of hot rolling is 1150±50°C, the final rolling temperature is 950±50°C, and the total deformation is 84±0.5 %, air-cooled to room temperature, made into a hot-rolled plate;

[0033] Heat the hot-rolled sheet to 760±20°C and keep it warm for 10 minutes, then perform a single pass of warm rolling, the rolling start temperature is 760±20°C, and the total deformation is 20±0.5%; after the single pass of warm rolling, air cool to room temperature to obtain a temperature Rolled plate, war...

Embodiment 2

[0035] Method is with embodiment 1, and difference is:

[0036] (1) Solution treatment time 150min;

[0037] (2) Keep warm for 5 minutes at 760±20°C;

[0038] (2) Insulate at 650±20°C for 15 minutes.

Embodiment 3

[0040] Method is with embodiment 1, and difference is:

[0041] (1) Solution treatment time 130min;

[0042] (2) Keep warm for 8 minutes at 760±20°C;

[0043] (2) Insulate at 650±20°C for 12 minutes.

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Abstract

The invention relates to a preparation method of a high-strength medium-carbon low-alloy steel plate. The method comprises the following steps: (1) smelting molten steel according to D6A steel components, performing smelting under a protective atmosphere condition, and performing casting to obtain an ingot casting with original coarse grains; (2) heating the ingot casting to 1200 + / -50 DEG C for solution treatment, then performing six passes of hot rolling, performing air cooling to the room temperature, and making a hot rolled plate; (3) performing heating to 760 + / -20 DEG C, keeping warm for5-10 minutes, and carrying out single-pass warm rolling until the total deformation is 20 + / -0.5%; and performing air cooling to room temperature, keeping warm for 10-15 min at the temperature of 650+ / -20 DEG C, and performing air cooling to room temperature. The product provided by the invention has high room-temperature tensile strength and good plasticity, and has comprehensive mechanical properties superior to those of a steel material prepared by a traditional quenching and tempering method; and the preparation method disclosed by the invention is simple, and can be obtained by only improving process conditions and controlling proper heat treatment parameters.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for preparing a high-strength medium-carbon low-alloy steel plate. Background technique [0002] Low-alloy ultra-high-strength steel is developed on the basis of adding a small amount of alloying elements to structural steel. The alloying elements cause solid solution strengthening of the steel and improve the hardenability of the steel and the tempering stability of the martensite through the alloying elements. properties; the main alloying elements include Mn, Cr, Si, Ni, Mo, V, etc., but their total content is generally within 5%; compared with structural steel, except for slightly higher content of Mo, other alloying elements There is little difference in content and type, and can be roughly divided into several steel series such as CrNiMo steel, CrMo steel, CrMnNiSi steel, CrMnSi steel, SiMnAlV steel, etc. The carbon content is generally 0.27-0.50%, and most of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C21D8/02
CPCC21D8/0226C21D8/0231C21D8/0247C21D2211/003C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46
Inventor 申勇峰张小丽冯晓伟薛文颖
Owner NORTHEASTERN UNIV