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Austenitic heat-resistant steel and preparation method thereof

A technology of austenitic heat-resistant steel and steel ingot, which is applied in the field of austenitic heat-resistant steel, can solve the problems of inability to strengthen grain boundaries and reduce high-temperature creep performance, so as to prevent high-temperature creep, improve high-temperature creep strength, The effect of less elements

Active Publication Date: 2014-10-01
马鞍山市星新机械材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the precipitated phase M 23 C 6 , MX, etc. will undergo phase transformation or coarsening and growth during the long-term service of heat-resistant steel, and will precipitate discontinuously at the grain boundary, and cannot strengthen the grain boundary at high temperature, which significantly reduces the high-temperature creep performance

Method used

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  • Austenitic heat-resistant steel and preparation method thereof
  • Austenitic heat-resistant steel and preparation method thereof
  • Austenitic heat-resistant steel and preparation method thereof

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preparation example Construction

[0030] like figure 1 Shown, the preparation method of austenitic heat-resistant steel of the present invention comprises the steps:

[0031] S1. In terms of mass percentage, according to the alloy composition and burning loss, the raw materials are equipped with carbon 0.01%, chromium 18.6%, nickel 31%, niobium 3.5%, manganese 0.5%, lanthanum 1.6%, boron 0.01% and iron balance. Put the weighed materials into the magnesia crucible;

[0032] S2. Put the magnesia crucible containing various materials into a vacuum furnace, and heat and refine the materials in the magnesia crucible;

[0033] S3. Stand still to cool down, add final deoxidizer to the magnesia crucible, and pour the molten metal into the steel ingot mold at a temperature higher than the melting point, and after solidification, remove the solidified and formed steel ingot from the steel ingot mold;

[0034] S4. Perform solution treatment and aging treatment on the solidified steel ingot.

[0035] Wherein, in step S...

Embodiment 1

[0046] In terms of mass percentage, according to the alloy composition and burning loss, the raw materials are equipped with carbon 0.01%, chromium 18.6%, nickel 31%, niobium 3.5%, manganese 0.5%, lanthanum 1.6%, boron 0.01% and iron balance. Measure each material into a magnesia crucible for later use. Put the magnesia crucible filled with various materials into a vacuum furnace to heat and refine the materials in the magnesia crucible.

[0047] In this embodiment, a 50kg vacuum furnace is used. The parameters of the vacuum furnace are a capacity of 0.05T, a rated power of 120 kW, a frequency of 2.5 kHz, and an ultimate vacuum of 6.7×10 -3 mmHg, rated temperature 1700°C, weight 1.5 tons, control voltage 220V.

[0048] Let stand to cool down for 3 minutes, add nickel-magnesium alloy into the magnesia crucible as a final deoxidizer, and then send electricity to the induction coil in the vacuum furnace with a power of 30kw for 1.5 minutes. The molten metal is poured into the s...

Embodiment 2

[0052] The difference between this embodiment and the above-mentioned embodiment 1 is that the time for aging treatment is 12 hours. Then, grinding, polishing and corrosion are carried out, and the surface of the sample is observed under a scanning electron microscope.

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Abstract

The invention discloses an austenitic heat-resistant steel and a preparation method thereof. The preparation method comprises the following steps: S1, weighing materials; S2, heating and refining the materials; S3, standing still for temperature reduction, adding an end deoxidizing agent, casting the materials into ingot molds, and demoulding after solidification; S4, carrying out solution treatment and aging treatment. The austenitic heat-resistant steel has favorable high-temperature resistant croop property and permanent strength. The austenitic heat-resistant steel cannot change in phase, nor coarsen and enlarges remarkably, and is favorable in stability. After solution treatment and aging treatment, continuous Laves phase precipitates from austenitic grain boundary and strip-shaped Laves-phase Fe2Nb precipitates from austenitic crystal. The Laves-phase Fe2Nb continuous precipitates as a precipitation strengthening phase, so as to efficiently improve the high-temperature long-time strength of the austenitic heat-resistant steel. The austenitic heat-resistant steel is less in element, simple in ingredient, and easy for industrial production.

Description

technical field [0001] The invention relates to an austenitic heat-resistant steel, in particular to an austenitic heat-resistant steel with good high-temperature creep strength and a preparation method thereof. Background technique [0002] The rapid development of ultra-supercritical generator sets puts forward more stringent requirements for high-temperature structural materials. High-temperature structural materials not only have good high-temperature creep resistance, but also have good high-temperature oxidation resistance and considerable economy. At present, the commonly used high-temperature metal materials mainly include: ferritic / martensitic heat-resistant steel, austenitic heat-resistant steel and high-temperature alloy. [0003] Among them, the new 9-12Cr ferritic heat-resistant steel has become the key material of the 600°C supercritical unit, but its oxidation resistance is poor and the structure stability cannot meet the long-term service requirements, and i...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C38/58C21D1/78
Inventor 夏志新张弛姚春发陈升伟杨志刚
Owner 马鞍山市星新机械材料有限公司
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