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High-temperature-resistant ferrochrome alloy for heat-resistant cushion block of steel rolling heating furnace and preparation method thereof

A ferrochrome alloy, high temperature resistant technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of high temperature creep, service life of only 1 year, poor cooling effect of heat-resistant pads, etc., to alleviate oxidation, The effect of prolonging the service life and good application prospects

Inactive Publication Date: 2019-06-21
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting point of Co alloy is 1380-1390°C. The main problems in its use are burning loss, high-temperature creep, poor cooling effect of heat-resistant pads, and obvious black marks of water beams after heating the slab in the heating furnace, which affects Finished product quality
Moreover, at the operating temperature below 1300°C, the service life is only 3 to 5 years
At the same time, because the temperature of the high-temperature silicon steel heating furnace reaches 1420°C, the Co alloy heat-resistant pads burn more seriously, and the service life is only one year

Method used

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  • High-temperature-resistant ferrochrome alloy for heat-resistant cushion block of steel rolling heating furnace and preparation method thereof
  • High-temperature-resistant ferrochrome alloy for heat-resistant cushion block of steel rolling heating furnace and preparation method thereof
  • High-temperature-resistant ferrochrome alloy for heat-resistant cushion block of steel rolling heating furnace and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0031] The second aspect of the present invention provides a method for preparing the above-mentioned high-temperature-resistant ferrochrome alloy, the steps comprising:

[0032] S1. According to the proportion of high-temperature-resistant ferrochrome alloy, first mix chromium and iron, and melt at 1650-1700°C to obtain ferrochrome alloy liquid;

[0033] S2, adding tungsten to the ferrochrome liquid, mixing evenly to obtain master alloy;

[0034] S3. Carry out vacuum smelting of the master alloy at 1800-1900° C., and cast it into shape by die casting method. The casting temperature is 1680-1720° C. to obtain a high-temperature-resistant ferrochrome alloy.

[0035] The third aspect of the present invention provides a heat-resistant pad for a steel rolling heating furnace. The high-temperature-resistant ferrochrome alloy prepared by the above preparation method is cleaned, finished, and inspected to obtain a heat-resistant pad for a steel rolling heating furnace with a thicknes...

Embodiment 1

[0037] This embodiment provides a high-temperature-resistant ferro-chrome alloy for a heat-resistant pad of a steel rolling heating furnace, and its chemical composition is shown in Table 1.

[0038] Table 1 Chemical composition of high temperature ferrochrome alloy

[0039] chromium iron tungsten other 85％ 13％ 1.9％ 0.1％

[0040] The high-temperature-resistant ferrochromium alloy of the present invention adopts vacuum smelting and precision casting, and its main technological process is: process design→mold manufacturing→alloy melting→casting→cleaning and finishing→inspection→finished product.

[0041] The specific process is as follows:

[0042] Design process to prepare molds for precision casting with high temperature resistance. According to the proportion of high-temperature-resistant ferrochrome alloy, first mix chromium and iron, and melt it at 1680°C to obtain a ferrochrome alloy liquid; add tungsten to the ferrochrome alloy liquid, and mix e...

Embodiment 2

[0044] In this example, the performance test of the high-temperature-resistant pad provided in Example 1 was carried out. In order to compare with the test results, the conventional material Co50 for the heat-resistant pad of the heating furnace was tested under the same conditions. The test results are shown in the table 2.

[0045] Table 2 Performance comparison table of high-temperature ferrochrome alloy block and Co50 alloy heat-resistant block

[0046]

[0047] From the comparison in Table 2, it can be seen that the heat-resistant block made of high-temperature chromium-iron alloy is about 3 times better than the Co50 alloy heat-resistant block in terms of oxidation resistance at 1300 ° C, and the high-temperature creep rate at 1300 ° C is that of Co50 0.13 times that of the alloy heat-resistant block, the performance of the ferrochrome alloy provided by Example 1 is significantly better than that of the Co50 alloy.

[0048] Further, the ferrochrome gasket provided in...

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Abstract

The invention provides a high-temperature-resistant ferrochrome alloy for a heat-resistant cushion block of a steel rolling heating furnace. The alloy is prepared from, by weight, 80-90% of chromium,1.5-3.5% of tungsten, 10-18% of iron and inevitable impurities. The heat-resistant cushion block prepared from the high-temperature-resistant ferrochrome alloy and by vacuum smelting and precision casting can be used for a long time at the furnace temperature of 1,300 DEG C-1,420 DEG C in the steel rolling heating furnace; and meanwhile, a supporting billet arranged on a heating furnace water-cooling beam has good high-temperature-resistant compression creep property and high-temperature-resistant property, so that the oxidation, creep and nodulation are relieved, and the service life of the heat-resistant cushion block is prolonged.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy materials, and in particular relates to a high-temperature-resistant ferrochromium alloy used for a heat-resistant cushion block of a steel rolling heating furnace and a preparation method thereof. Background technique [0002] The steel billet must be heated by a continuous steel rolling heating furnace before rolling, so that the steel billet undergoes three processes of preheating, heating, and soaking (isothermal) in sequence, and the steel billet is heated to a specific process temperature, and the internal and external temperatures of the steel billet are required to be consistent. . The continuous steel rolling heating furnace includes a walking heating furnace and a pushing steel heating furnace. The continuous steel rolling heating furnace is equipped with water-cooled beams. During the heating process of the billet, heat-resistant pads are arranged on the water-cooled beam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/06C22C1/03C21D9/70
Inventor 曹恒刘志民麻卫平陈迪安李金保陈俊男王蕾
Owner BEIJING SHOUGANG CO LTD
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