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High-temperature-resistant cobalt-based alloy for heat-resistant heel block of steel rolling heating furnace

A cobalt-based alloy and heating furnace technology, applied in the field of cobalt-based superalloys, can solve problems such as the inability to effectively guarantee the service life, and achieve the effects of prolonging the service life, high creep strength and anti-oxidation

Inactive Publication Date: 2011-08-31
中冶京诚(扬州)冶金科技产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, high-efficiency and energy-saving vaporization cooling technology has been widely used in walking-type large slab heating furnaces for steel rolling, but the use temperature of heat-resistant pads has also increased. Under such harsh working conditions, the service life cannot be effectively guaranteed, and various heating furnace companies are actively exploring new high-temperature alloys suitable for manufacturing heat-resistant pads

Method used

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  • High-temperature-resistant cobalt-based alloy for heat-resistant heel block of steel rolling heating furnace
  • High-temperature-resistant cobalt-based alloy for heat-resistant heel block of steel rolling heating furnace
  • High-temperature-resistant cobalt-based alloy for heat-resistant heel block of steel rolling heating furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A high-temperature-resistant cobalt-based alloy used for heat-resistant cushion blocks of steel rolling heating furnaces, the chemical composition (wt%) is: C 0.05-0.20%, Si 0.5-2.0%, Mn 0.5-1.5%, Cr 27-30%, Co 39-41%, Ni 14-18%, W 2-5%, Ce 0.02-0.2%, and the rest is Fe.

[0026] The chemical composition is preferably: C 0.12~0.15 wt%, Si 1.5~1.7 wt%, Mn 1.2~1.4 wt%, Cr 27~29 wt%, Co 39~40 wt%, Ni 15~17 wt%, W 3~ 4 wt%, Ce 0.05~0.1 wt%, the rest is Fe.

[0027] The metallographic diagram of the alloy is shown in figure 1 shown.

Embodiment 2

[0029] A heat-resistant pad for a steel rolling heating furnace is made of the high-temperature-resistant cobalt-based alloy of Example 1.

[0030] The preparation method is as follows: the double vacuum smelting process is adopted, and the precision casting is formed. The first vacuum smelting master alloy is carried out according to GBn185-82 standard; the second refining block alloy. After double-vacuum smelting, the content of impurities and harmful gases in the heat-resistant block is low, and the micro-cracks inside the block and the eutectic phase with low melting point at the grain boundary are eliminated, which significantly improves the strength and oxidation resistance of the heat-resistant block.

[0031] The heat-resistant block manufactured is mainly suitable for walking heating furnaces for rolling steel. Compared with the heat-resistant block made of UmCo-50 and KHR40CM alloys widely used at present, it has better structural stability and oxidation resistance. ...

Embodiment 3

[0032] Embodiment 3 trial comparative test

[0033] In the comparative test, the heat-resistant block manufactured by Example 2 and the KHR40CM alloy heat-resistant block used as the comparative test were both precision-cast by double vacuum smelting process, and 4 furnaces were extracted from each of them. The specific chemical composition is shown in figure 2 . In the walking beam heating furnace for rolling steel that adopts vaporization cooling, the actual trial comparison test of the two is carried out.

[0034] In the trial, the heat-resistant pads made of the alloy of the present invention and the KHR40CM heat-resistant pads will be evenly and alternately arranged in the width direction of the water beam furnace in the hot-spreading section, and then the measured pads will be uniformly numbered so that they can be tested in the same temperature gradient interval. For comparison, the specific results are as follows image 3 shown.

[0035] From image 3 The data c...

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Abstract

The invention discloses a high-temperature-resistant cobalt-based alloy for a heat-resistant heel block of a steel rolling heating furnace. The high-temperature-resistant cobalt-based alloy for the heat-resistant heel block of the steel rolling heating furnace comprises the following chemical components in percentage by weight: 0.05 to 0.20 percent of C, 0.5 to 2.0 percent of Si, 0.5 to 1.5 percent of Mn, 27 to 30 percent of Cr, 39 to 41 percent of Co, 14 to 18 percent of Ni, 2 to 5 percent of W, 0.02 to 0.2 percent of Ce, and the balance of Fe. Compared with UmCo-50 and KHR40CM alloys which are widely used in the prior art, the high-temperature-resistant cobalt-based alloy has the remarkable advantages of having higher creep strength as well as oxidation resistance and corrosion resistance at the temperature of 1,300 DEG C, and effectively prolonging the service life of prepared heat-resistant heel blocks.

Description

technical field [0001] The invention relates to a cobalt-based high-temperature alloy, in particular to a high-temperature-resistant cobalt-based alloy used for a heat-resistant cushion block of a steel rolling heating furnace. Background technique [0002] Now the society's national defense, automobile, shipbuilding and other industries are developing rapidly, and the country's demand for large wide and thick plates is also increasing. At present, the production of wide and thick plates in the world adopts high-efficiency and energy-saving hot rolling technology, step-by-step and push-rolled. Heating furnace is the key equipment for steel rolling production and product deep processing in iron and steel enterprises, and it is widely used. As a key component of the steel rolling heating furnace, the heat-resistant pad has been exposed to harsh working conditions of high temperature, corrosive atmosphere, and high load for a long time, so the material requirements are very str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07
Inventor 董杰蒋乃富侯煜周劲松田军胡志成汪宣伟
Owner 中冶京诚(扬州)冶金科技产业有限公司