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A kind of high toughness weldable microalloyed cast steel and its preparation method

A micro-alloying and high-toughness technology, which is applied in the field of high-toughness weldable micro-alloyed cast steel for large castings and its preparation, high-toughness weldable micro-alloyed cast steel and its preparation, can solve problems that do not involve weldable Performance and other issues, to achieve the effect of superior comprehensive mechanical properties, excellent welding performance, and good toughness

Active Publication Date: 2017-01-11
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the maximum elongation of the product obtained by this patent is only 28%.
More critically, the compositional design and preparation of microalloyed cast steel did not involve how to improve its weldability

Method used

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  • A kind of high toughness weldable microalloyed cast steel and its preparation method
  • A kind of high toughness weldable microalloyed cast steel and its preparation method
  • A kind of high toughness weldable microalloyed cast steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Design alloy composition, calculated as mass percentage:

[0044] C 0.148%, Si 0.423%, Mn 0.796%, Cr 0.0295%, Ni 0.0211%, Nb 0.0433%, V 0.0122%, Al 0.0387%, P≤0.02%, S≤0.005%, the rest is Fe and unavoidable trace impurity elements.

[0045] In this embodiment, the supplementary sources of alloy elements are Si-Fe alloys, Mn-Fe alloys, Cr-Ni-Fe alloys, V-Al-Fe alloys, and the supplementary sources of Nb elements are Nb-Fe alloys.

[0046] The smelting steps are:

[0047] (1) Pretreatment: before smelting, dry the ladle, furnace body, mold, scrap steel, scrap iron, and alloy to reduce the water vapor content and remove the mud and rust on the scrap steel surface;

[0048] (2) Ingredients: Calculate the ingredients according to the chemical composition requirements of cast steel and the alloy burning loss rate;

[0049] (3) Charging and smelting: Add scrap steel and scrap iron to the intermediate frequency furnace for melting. After the molten steel is melted, control t...

Embodiment 2

[0069] Design alloy composition, calculated as mass percentage:

[0070] C 0.145%, Si 0.463%, Mn 0.758%, Cr 0.0284%, Ni 0.0146%, Nb 0.0719%, V 0.0099%, Al 0.0523%, P≤0.02%, S≤0.005%, the rest is Fe and unavoidable trace impurity elements.

[0071] In this embodiment, the supplementary sources of alloy elements are Si-Fe alloys, Mn-Fe alloys, Cr-Ni-Fe alloys, V-Al-Fe alloys, and the supplementary sources of Nb elements are Nb-Fe alloys.

[0072] The smelting steps are:

[0073] (1) Pretreatment: before smelting, dry the ladle, furnace body, mold, scrap steel, scrap iron, and alloy to reduce the water vapor content and remove the mud and rust on the scrap steel surface;

[0074] (2) Ingredients: Calculate the ingredients according to the chemical composition requirements of cast steel and the alloy burning loss rate;

[0075] (3) Charging and smelting: Add scrap steel and scrap iron to the intermediate frequency furnace for melting. After the molten steel is melted, control t...

Embodiment 3

[0083] Design alloy composition, calculated as mass percentage:

[0084] C 0.152%, Si 0.455%, Mn 0.715%, Cr 0.0252%, Ni 0.0153%, Nb 0.0536%, V 0.0110%, Al 0.0523%, P≤0.02%, S≤0.005%, the rest is Fe and unavoidable trace impurity elements.

[0085] In this embodiment, the supplementary sources of alloy elements are Si-Fe alloys, Mn-Fe alloys, Cr-Ni-Fe alloys, V-Al-Fe alloys, and the supplementary sources of Nb elements are Nb-Fe alloys.

[0086] Other operating steps and operating parameters are completely consistent with embodiment 1;

[0087] The mechanical data of the obtained non-welded finished products are shown in Table 1.

[0088]The obtained castings were welded with E5015 as the welding material by manual arc welding technology, and then quenched and tempered to obtain welded products; the mechanical properties of the welded products are shown in Table 2.

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Abstract

The invention relates to high-toughness optimal welding micro-alloyed cast steel and a preparation method thereof, and belongs to the technical field of smelting preparation of cast steel materials. The cast steel comprises the following components in percentage by mass: 0.10-0.25% of C, 0.30-0.70% of Si, 0.65-1.00% of Mn, 0.01-0.15% of Cr, 0.01-0.04% of Ni, 0.01-0.15% of Nb, 0.005-0.015% of V, 0.025-0.075% of Al, P not more than 0.02%, S not more than 0.005%, and the balance of Fe and inevitable micro impurity elements. The cast steel uses waste iron and waste steel as raw materials; and the waste iron and the waste steel are smelted through a medium-frequency induction furnace to obtain the micro-alloyed cast steel with low phosphor and sulfur content, excellent mechanical property and excellent weldability. The cast steel is reasonable in component design, simple in preparation process and convenient for large-scale industrialized application and production.

Description

technical field [0001] The invention relates to a high-toughness weldable micro-alloyed cast steel and a preparation method thereof; it belongs to the technical field of smelting and preparation of cast steel materials, and in particular relates to a high-toughness weldable cast steel suitable for large-scale castings in ships, petroleum, electric power and other equipment. Microalloyed cast steel material and its preparation method. Background technique [0002] my country's existing large-scale steel casting enterprises generally use intermediate frequency furnaces and electric arc furnaces to smelt scrap steel and scrap iron to produce cast steel materials. Among them, the intermediate frequency furnace has the characteristics of fast melting rate, high production efficiency, small oxidation burning loss, high alloy yield, and easy control of furnace temperature, so it is widely used in large steel casting enterprises. However, the intermediate frequency furnace steelmak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48C22C33/04C21D1/18
Inventor 高文理冷宇傅定发
Owner HUNAN UNIV