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A kind of molybdenum-cerium composite alloyed steam turbine blade steel and preparation method thereof

A steam turbine blade and composite alloy technology, applied in the field of steel materials, can solve the problems of limited solubility, limited improvement of corrosion resistance and high-temperature mechanical properties, etc.

Active Publication Date: 2017-12-22
丹阳市曙光新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the research results, due to the large atomic radius of rare earth elements, the solubility in steel is limited, so the use of rare earth elements alone has limited improvement in the corrosion resistance and high-temperature mechanical properties of steel.

Method used

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  • A kind of molybdenum-cerium composite alloyed steam turbine blade steel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0017] A 25kg vacuum induction furnace is used for smelting. The induction furnace crucible is sintered from powdered MgO. Steel ingots can be poured in the vacuum chamber. The induction furnace is equipped with a three-time alloying device in a vacuum state. The raw materials for smelting include industrial pure iron, metal manganese, metal molybdenum, metal nickel, metal cerium, aluminum, ferrosilicon and waste graphite electrodes (used for composition adjustment of C), etc. In order to prevent the cold steel remaining in the crucible from different steel types smelted in the previous period from interfering with the composition of the test steel, the furnace was "washed" twice with industrial pure iron before smelting. Before smelting, the alloy is accurately weighed according to the 21kg steel ingot, and the ingredients are accurately proportioned to ensure that the smelting composition is within the control range.

[0018] Put the weighed industrial pure iron, metal nicke...

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Abstract

The invention relates to martensite steam turbine blade steel, in particular to molybdenum-cerium composite alloyed steam turbine blade steel and a preparation method thereof, and belongs to the field of steel and iron materials. Molybdenum and cerium are synchronously added in 1Cr13 steel; the addition of cerium is to improve the activity of molybdenum in the steel and to enhance the effect of molybdenum; cerium also can improve high-temperature mechanical performance and corrosion resistance of the steel; and cerium can improve high-temperature oxidation resistance of the steel to achieve the composite alloying effect. Compared with steel only added with a Mo element, the molybdenum-cerium composite alloyed steam turbine blade steel is low in added cerium element amount and low in cost increment, but enhances the effect of molybdenum, and improves the high-temperature oxidation resistance. Compared with steel singly added with a rare earth element, the molybdenum-cerium composite alloyed steam turbine blade steel is more excellent in high-temperature mechanical performance and corrosion resistance.

Description

technical field [0001] The invention relates to a martensitic steam turbine blade steel, in particular to a molybdenum-cerium composite alloyed steam turbine blade steel and a preparation method thereof, belonging to the field of iron and steel materials. Background technique [0002] 1Cr13 steel is a representative martensitic steam turbine blade steel, which meets the requirements for the use of steam turbine blades below 450°C. With the increase of steam parameters, 1Cr13 steel has poor microstructure stability and cannot adapt to higher service temperatures. On the basis of 1Cr13, Mo, Nb, V, N, W and other alloying elements are added to improve the performance of the material at high temperatures. These alloying elements can play the role of solid solution strengthening in steel, improve the high temperature strength of steel, and at the same time improve the corrosion resistance of materials, but the above alloying elements have no significant effect on improving the hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/02C22C38/04C22C33/06
CPCC22C33/06C22C38/005C22C38/02C22C38/04C22C38/44
Inventor 李亚波马鸣远赵继朋张庆徐佩锋吴建忠陈新刚
Owner 丹阳市曙光新材料科技有限公司