Austenite-bainite alloy steel and preparation method thereof

A technology of alloy steel and austenite, which is applied in the field of Austenitic alloy steel and its preparation, can solve the problems of limited toughness improvement ability, and achieve the effect of high strength, good plasticity and toughness

Inactive Publication Date: 2020-09-04
ZHEJIANG DESHENG RAILWAY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elongation of the rail is greater than 15%, indicating that the ability to improve toughness is still limited

Method used

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  • Austenite-bainite alloy steel and preparation method thereof
  • Austenite-bainite alloy steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An austenite alloy steel, the alloy steel comprising austenite and bainite, the composition of the alloy steel is calculated according to mass percentage, including: C: 0.32; Si: 1.84; Mn: 1.70; P: 0.014 ; S: 0.014; Cr: 1.11; Mo: 0.35; V: 0.15; Ti: 0.10~0.20; Cu: 0.10~0.25; the balance is Fe and inevitable gas impurity elements.

[0030] The inevitable gas impurity elements need to be strictly controlled: [O] ≤ 10ppm, [H] ≤ 1.0ppm, [N] ≤ 70ppm.

[0031] The content of Ti and Cu in the alloy steel is calculated by mass percentage, and is preferably 0.2 and 0.25, respectively.

[0032] A preparation process of austenitic alloy steel, the specific steps are as follows:

[0033] (1) Material preparation: Weigh the corresponding materials according to the alloy steel composition in Example 1. The total weight of the materials is calculated according to 500Kg. After weighing, they are placed in an electric furnace or a converter for smelting;

[0034] (2) Electric furnace or converter...

Embodiment 2

[0042] The difference from embodiment 1 is that an austenitic alloy steel, the structure of the alloy steel includes austenite and bainite, and the composition of the alloy steel is calculated according to mass percentage, including: C: 0.30; Si : 1.75; Mn: 1.80; P: 0.007; S: 0.007; Cr: 1.2; Mo: 0.40; V: 0.12; Ti: 0.10~0.20; Cu: 0.10~0.25; the balance is Fe and inevitable gas impurity elements . In addition, the content of Ti and Cu in the alloy steel is calculated by mass percentage, and is preferably 0.15 and 0.18, respectively.

[0043] The role of each component of alloy steel is as follows:

[0044] The role of C, C is a strong interstitial solid solution strengthening element, which is very important to the strength, hardness and toughness of steel. As the carbon content increases, the strength and hardness of the steel increase, and the toughness and weldability decrease. Carbon is an element that stabilizes austenite, because it has a large solubility in austenite and a ...

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Abstract

The invention relates to austenite-bainite alloy steel and a preparation method thereof. The austenite-bainite alloy steel comprises the following components of, in percentage by mass, 0.26-0.35 of C,1.66-1.84 of Si, 1.70-1.90 of Mn; less than or equal to 0.014 of P, less than or equal to 0.014 of S, 1.11-1.29 of Cr, 0.35-0.45 of Mo, 0.08-0.15 of V, and the balance Fe and inevitable gas impurityelements; the alloy steel further comprises the following components of less than or equal to 0.30 of Ti, and less than or equal to 0.30 of Cu, wherein the gas impurity elements are strictly controlled, specifically, [O] is less than or equal to 10 ppm, [H] is less than or equal to 1.0 ppm, and [N] is less than or equal to 70ppm. The preparation method comprises the steps of material preparation,electric furnace or converter smelting, external refining, a continuous casting process and a heat treatment process. In the mass components of the austenite-bainite alloy steel, the C content exceedsthe conventional C content of alloy steel, martensite still does not appear, bainite can be generated, the prepared alloy steel has high strength, good plasticity and toughness and certain intergranular corrosion resistance, and the service life of the alloy steel is prolonged.

Description

Technical field [0001] The invention relates to the field of material preparation, in particular to an austenite alloy steel and a preparation method thereof. Background technique [0002] With the development of my country's railway industry towards heavy load and high speed, higher and higher requirements have been put forward for the strength, toughness, and impact performance of the steel used in railway rails and parts. The high-manganese steel that is currently used in large quantities is becoming more and more difficult to meet the needs of current railway development. Especially for railway turnout parts with poor service conditions, it is changing from combined turnouts to integral turnouts, which requires the alloy steel used to have Higher strength, toughness and impact performance. Generally, in order to obtain a fine structure, Nb is usually added during the smelting process. The resulting compound can effectively hinder the movement of the recrystallized grain boun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/34C22C38/24C22C38/22C22C38/28C22C38/20C21D6/00
CPCC21D6/005C21D6/008C21D2211/001C21D2211/002C22C38/20C22C38/22C22C38/24C22C38/28C22C38/34C22C38/38
Inventor 关铁
Owner ZHEJIANG DESHENG RAILWAY EQUIP
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