A kind of fe-mn-al-c series medium manganese low temperature steel and preparation method thereof

A technology of fe-mn-al-c and low-temperature steel, which is applied in the field of Fe-Mn-Al-C medium-manganese low-temperature steel and its preparation, can solve the problems of high production cost and difficulty of low-temperature steel, and achieve the goal of using Good performance, low cost, easy to make effects

Active Publication Date: 2020-09-04
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the high cost and difficulty of low-temperature steel production in the prior art, and provide a Fe-Mn-Al-C series medium-manganese low-temperature steel and a preparation method thereof. The Fe-Mn-Al-C system of the present invention Al-C series medium-manganese low-temperature steel has excellent impact toughness at low temperatures and good performance; the preparation method of the present invention combines reasonable composition design and heat treatment to make the steel of this system contain as much as possible The austenite structure can easily and conveniently obtain Fe-Mn-Al-C low-temperature steel with excellent impact toughness, which is easy to manufacture and low in cost, and is suitable for popularization and application

Method used

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preparation example Construction

[0031] The preparation method of this Fe-Mn-Al-C system medium manganese low temperature steel of the present invention comprises the following steps:

[0032] S1. Smelting: All raw materials are smelted in an atmosphere of protective gas; specifically, high-purity manganese ingots, iron ingots, aluminum ingots and carbon powder are selected, and smelted in a vacuum induction furnace in an argon-protected atmosphere;

[0033] S2. Forging: heat the melted steel ingot and keep it warm, then forge it into a forging billet, and then air cool it to room temperature; specifically, heat the melted steel ingot to 1200-1230°C and keep it warm for 2-2.5 hours, then forge the steel ingot For forging, then air-cooled to room temperature;

[0034] S3. Hot rolling: put the billet in a heating furnace to keep warm, then roll the billet to the plate, and air cool after rolling; specifically, put the forged billet in a heating furnace and keep it warm at 1200-1250°C for 1.5-2h , and then star...

Embodiment 1

[0040] The composition of the Fe-Mn-Al-C medium manganese low temperature steel in this embodiment is calculated by mass percentage: Mn: 12.44%, Al: 4.7%, C: 0.1%, and the balance is Fe and unavoidable impurity elements .

[0041] The method for preparing the Fe-Mn-Al-C series medium manganese low temperature steel is as follows:

[0042] S1. Smelting: select high-purity manganese block, iron block, aluminum block and carbon powder, and use vacuum induction furnace for smelting under the atmosphere of argon protection;

[0043] S2. Forging: After heating the smelted steel ingot to 1200°C and keeping it warm for 2 hours, forge the steel ingot to a cross-section of 100*30mm 2 The forged billet, then air cooled to room temperature;

[0044] S3. Hot rolling: Put the forged billet in a heating furnace and keep it warm at 1200°C for 2 hours, then start multi-pass rolling to form a hot-rolled plate with a thickness of 5mm, wherein the starting rolling temperature is 1180°C, and the...

Embodiment 2

[0048] The composition of the Fe-Mn-Al-C series medium manganese low temperature steel in this embodiment is calculated by mass percentage: Mn: 12%, Al: 4.5%, C: 0.1%, and the balance is Fe and unavoidable impurity elements .

[0049] The method for preparing the Fe-Mn-Al-C series medium manganese low temperature steel is as follows:

[0050] S1. Smelting: select high-purity manganese block, iron block, aluminum block and carbon powder, and use vacuum induction furnace for smelting under the atmosphere of argon protection;

[0051] S2. Forging: After heating the smelted steel ingot to 1220°C and keeping it warm for 2.5 hours, forge the steel ingot to 100*30mm 2 The forged billet, then air cooled to room temperature;

[0052] S3. Hot rolling: put the forged billet in a heating furnace and hold it at 1200°C for 1.5h, and roll it into a hot-rolled plate with a thickness of 5.5mm. The starting temperature is 1200°C, and the final rolling temperature is 880°C; using air cooling;...

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Abstract

The invention discloses a Fe-Mn-Al-C series medium-manganese low-temperature steel and a preparation method thereof. The Fe-Mn-Al-C series medium-manganese low-temperature steel comprises the chemicalingredients of, in percentage by mass, 12-15% of Mn, 4.5-5% of Al, 0.1-0.12% of C and the balance Fe and inevitable impurity elements. According to the Fe-Mn-Al-C series medium-manganese low-temperature steel and the preparation method thereof, the austenite tissue volume fraction of the low-temperature steel is larger than or equal to 47.7%, the impact energy of a -80 DEG C charpy impact test islarger than or equal to 33 J, after forging and multipass rolling are performed on a steel blank of the same ingredients with the Fe-Mn-Al-C series medium-manganese low-temperature steel, quenching+tempering heat treatment is performed on an obtained rolled blank, the Fe-Mn-Al-C series medium-manganese low-temperature steel with excellent impact toughness at low temperature is prepared, and the preparation method for the Fe-Mn-Al-C series medium-manganese low-temperature steel is simple.

Description

technical field [0001] The invention relates to the technical field of low-temperature steel, and more specifically relates to a Fe-Mn-Al-C system medium-manganese low-temperature steel and a preparation method thereof. Background technique [0002] With the rapid development of marine activities and the widespread use of structural steel and construction machinery steel in high-latitude cold regions in low-temperature environments, the development of low-temperature structural parts has become the research focus of steel industry and scientific researchers around the world. At present, researchers are developing new low-temperature structural steels mainly by adding Ni, Cr and other alloying elements, using controlled rolling, controlled cooling and heat treatment. As commonly used low-temperature steels, materials such as 9% Ni steel and Cr-Ni austenitic stainless steel need to add a large amount of expensive Ni and Cr elements, so the cost is high. The main microstructur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/06C21D8/00C21D1/18
CPCC21D1/18C21D8/005C21D2211/001C22C38/04C22C38/06
Inventor 章小峰万亚雄李家星武学俊黄贞益
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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