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Antioxidant heat-resisting alloy and preparation method

A heat-resistant alloy and anti-oxidation technology, which is applied in the field of alloys, can solve problems affecting the performance and quality stability of alloy furnace tubes, and achieve excellent oxidation resistance, good high-temperature strength, and excellent overall performance.

Active Publication Date: 2019-01-01
QINGDAO NPA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the preparation process, the control range of the harmful element nitrogen in the existing preparation process of aluminum alloy is too wide, and the harmful elements such as oxygen and sulfur are not controlled, which seriously affects the performance and quality stability of the alloy furnace tube.

Method used

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preparation example Construction

[0075] The preparation method of the anti-oxidation and heat-resistant alloy of the present invention varies according to different uses. If it is used for high-temperature parts used in the aerospace field, vacuum induction melting and casting must be adopted, including the following steps:

[0076] 1. Ingredients. Electrolytic nickel, metal aluminum, metal chromium (or ferrochrome), pure iron, metal tungsten, graphite, sponge hafnium, sponge titanium, sponge zirconium, and metal yttrium are selected as raw materials, and the raw materials are weighed in proportion for use.

[0077] 2. Feeding. Electrolytic nickel, metal chromium (or ferrochromium), pure iron, and metal tungsten are placed in the crucible, and other elements are added from the hopper.

[0078] 3. Melting, melting is carried out in a medium frequency induction vacuum melting furnace.

[0079] Send electricity with low power for 10 minutes to remove hydrogen, then send electricity with high power to complete ...

Embodiment 1

[0108] Example 1 corresponds to Alloy No. 1, Example 2 corresponds to Alloy No. 2, and so on. For convenience of comparison, Alloy No. 8 and Alloy No. 9 are the comparative materials of the prior art. Among them, No. 8 alloy is the weldable superalloy GH3230 with the highest service temperature, which is widely used in high-temperature parts of aerospace engine combustion chambers. No. 9 alloy is currently the best material HTE alloy for ethylene cracking furnace tubes in the petrochemical field.

[0109] The anti-oxidation heat-resistant alloy of embodiment 1-7 is prepared according to the following method:

[0110] Step 1: Weigh the raw materials for use;

[0111] Step 2: Put electrolytic nickel, pure iron and some graphite in the crucible of a non-vacuum intermediate frequency melting furnace with fixed-point casting function, and obtain molten steel after complete melting;

[0112] Step 3: The molten steel is heated up to the refining temperature and the remaining graphite ...

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Abstract

The invention relates to an antioxidant heat-resisting alloy and a preparation method and belongs to the technical field of alloys. The invention aims to solve the problems of high oxygen, sulfur andnitrogen contents, low proportion of Al2O3 film in the oxidation film on alloy surface, high aluminum content and low alloy toughness of the present alloy. The antioxidant heat-resisting alloy provided by the invention comprises the following components by weight percent: 2.5%-6% of Al, 24%-30% of Cr, 0.3%-0.55% of C, 30%-50% of Ni, 2%-8% of W, 0.01%-0.2% of Ti, 0.01%-0.2% of Zr, 0.01%-0.4% of Hf,0.01%-0.2% of Y, 0.01%-0.2% of V, less than 0.05% of N, less than 0.003% of O, less than 0.003% of S, less than 0.5% of Si and the balance of Fe and inevitable impurities, wherein only one of Ti andV exists. The preparation method for the antioxidant heat-resisting alloy comprises the following steps: smelting inactive element materials, refining, adding misch metal, adding slag and alloying theinactive elements. The full antioxidant temperature of the antioxidant heat-resisting alloy provided by the invention reaches up to 1200 DEG C and the alloy can long-term stably serve at 1200 DEG C or above.

Description

technical field [0001] The invention relates to the field of alloy technology, in particular to an oxidation-resistant heat-resistant alloy and a preparation method thereof. Background technique [0002] With the development of aviation, petrochemical and other fields, there is an urgent demand for materials with excellent high-temperature oxidation resistance at 1000-1200 °C, such as high-temperature components for aero-engine combustion chambers and exhaust nozzles, ethylene cracking furnace tubes, etc. In addition, in order to realize components The connection also requires the material to have good weldability. Most of the active materials for these parts are deformed superalloys and heat-resistant steels, which have good weldability, but the high-temperature oxidation resistance of the alloys is mainly achieved by adding a high content of Cr, and the oxide film formed at high temperatures is mainly Cr 2 o 3 , Cr 2 o 3 It is stable below 1000°C and has a good protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C19/05C22C30/00C23C8/12
CPCC22C1/02C22C1/023C22C19/053C22C30/00C23C8/12C22C38/06C22C38/46C22C38/50C22C38/44C22C38/005C23C8/02C23C8/14C23C8/80C23C8/06
Inventor 骆合力王兴雷李尚平古朝雄王建涛魏丽娟尹法杰王振华
Owner QINGDAO NPA IND
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