High-temperature antioxidizing paint for lowering oxidation burning of steel in heating furnace

An anti-oxidation coating and stainless steel technology, applied in the field of coatings, can solve the problems of increasing the cost of coatings, and achieve the effects of reducing high-temperature oxidation burning loss, improving surface quality, and reducing oxidation burning loss

Inactive Publication Date: 2009-06-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to patent documents, "a nano-silicate anti-oxidation coating for series steel billet annealing" (application number 200710053874.3) is cured by weight percentage of 20-30% binder and 8-12% composite phosphate 58-72% composite aluminosilicate filler, which can reduce the oxidation and burning loss of austenitic stainless steel 0Cr18Ni9, but the high alumina powder and zirconia in the raw materials need to be nano-sized, which undoubtedly increases the coating cost; and The paint is directly sprayed on the steel billet to cure in ten minutes, which is inconsistent with the development status of the stainless steel continuous casting and rolling-hot billet into the furnace, which limits the popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Prepare the basic filler according to the ratio of 30% of silica, 60% of alumina, 5% of magnesium oxide and 5% of calcium oxide; prepare the composite bond according to the ratio of 20% of sodium silicate, 70% of aluminum phosphate and 10% of potassium silicate agent. Mix 46% of the basic paint with 54% of the composite binder and add 0.5 times the weight of water, mix and grind the paint in a ball mill until the particle size is all finer than 500 microns, and obtain the high-temperature anti-oxidation paint A of the present invention.

[0014] Paint A is sprayed on the surface of austenitic stainless steel 0Cr18Ni9 at 700°C to form an off-white original coating. Put the coated steel plate and the unpainted steel plate into the furnace at the same time, and keep the temperature at 1250°C for 3 hours. The iron oxide scale on the surface of the sprayed steel plate peels off automatically after being out of the furnace, which is significantly thinner than the unsprayed i...

Embodiment 2

[0016] Prepare the basic filler according to the ratio of 94% of silica, 2% of alumina, 2% of magnesium oxide and 2% of calcium oxide; prepare the composite binder according to the ratio of 90% of sodium silicate and 10% of aluminum phosphate. Mix 92% of the basic paint with 8% of the composite binder and add 2 times the weight of water, mix and grind the paint in a ball mill until the particle size is all finer than 500 microns, and obtain the high-temperature anti-oxidation paint B of the present invention.

[0017] Paint B is sprayed on the surface of austenitic stainless steel 0Cr17Ni12Mo2 at 900°C to form an off-white original coating. Put the coated steel plate and the unpainted steel plate into the furnace at the same time, and keep the temperature at 1300°C for 4 hours. After being baked, the oxide scale on the surface of the sprayed steel plate peels off automatically, which is significantly thinner than the unsprayed oxide scale, and the oxidation burning loss per un...

Embodiment 3

[0019] The basic filler is prepared according to the ratio of 80% of silica, 10% of alumina, 5% of magnesium oxide and 5% of calcium oxide; the composite binder is prepared according to the ratio of 30% of sodium silicate and 70% of aluminum phosphate. Mix 50% of the basic paint with 50% of the composite binder, add 1 times the weight of water, mix and grind the paint in a ball mill until the particle size is finer than 20 microns, and obtain the high-temperature anti-oxidation paint C of the present invention.

[0020] Spray paint C on the surface of ferritic stainless steel 1Cr17 at 1000°C to form an off-white original coating. Put the coated steel plate and the unpainted steel plate into the furnace at the same time, and keep the temperature at 1200°C for 2 hours. After being out of the furnace, the oxide scale on the surface of the sprayed steel plate peels off automatically, which is significantly thinner than the unsprayed oxide scale, and the oxidation burning loss per ...

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Abstract

The invention relates to a high temperature anti-oxidation coating capable of reducing the oxidation burning loss of stainless steel in a heating furnace. The high temperature anti-oxidation coating is characterized in that the coating comprises solid materials consisting of 46 to 92 percent of basic filler and 8 to 54 percent of composite binder, and water which is 0.5 to 20 folds of the weight of the solid materials. The basic filler comprises several chemical components selected from silicon dioxide, alumina, magnesia, calcium oxide and boric oxide. The composite binder consists of several components selected from sodium silicate, lithium metasilicate and aluminum phosphate. The coating can be painted at the normal temperature or sprayed onto the surface of a stainless steel billet from the room temperature to 1,000 DEG C. The coating can form a protective coat at the high temperature, thereby greatly reducing the high temperature oxidation burning loss of stainless steel at 1,400 DEG C, and reducing the unit area oxidation burning loss by more than 90 percent. After stainless steel is drawn out of the furnace, the iron oxide scale can be fully stripped off under the actions of temperature reduction or high pressure water; the amount of the produced iron oxide scale is also obviously reduced; and the stainless steel surface quality is remarkably improved.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a high-temperature anti-oxidation coating for reducing oxidation and burning loss of stainless steel in a heating furnace. Background technique [0002] The heating of stainless steel billets before hot rolling is an essential and important process in the production of stainless steel. Among them, the environment in the heating furnace is extremely harsh, the furnace gas temperature is as high as 1200°C-1350°C, and the instantaneous impact temperature can reach 1450°C. And the furnace gas contains H 2 O.CO 2 , O 2 and other oxidizing components. This environment causes severe oxidation of the stainless steel billet, resulting in oxidation and burning of the metal. High-temperature oxidation will also cause the depletion of alloy elements on the surface of stainless steel, and at the same time generate a dense spinel structure oxide scale that is closely combined with the surface of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/06
Inventor 叶树峰刘朋魏连启周旬陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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