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Nano-isolation agent for preventing high-temperature surface oxidation of stainless steel

A technology of surface oxidation and isolation agent, applied in the field of anti-oxidation isolation agent, can solve the problems of depletion of nickel and chromium elements, oxidation burning loss, difficulty in removing oxide layer, etc., to reduce oxidation burning loss, save consumption, preparation technology and Simple effect of isolation agent implementation process

Inactive Publication Date: 2013-09-04
上海钫淦冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the existing problems such as easy oxidation and burning of the surface of the substrate during the heating process of stainless steel, depletion of nickel and chromium elements, and difficulty in removing the oxide layer, and provides a stainless steel high-temperature surface oxidation nano-separator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the ratio of 50% zircon, 25% blast furnace slag, 10% nano-silica, 10% borax, 3% nano-strontium hydroxide, 1% silica sol, and 1% sodium alginate, the added water is 50% of the aforementioned total weight, the release agent was mixed and ground in a ball mill to obtain the high-temperature anti-oxidation nano-release agent A of the present invention.

[0025] Spray the release agent A on the surface of austenitic stainless steel 0Cr17Ni12Mo2 at room temperature to form a 100 μm off-white isolation layer, put the sprayed billets and unsprayed billets into the furnace at the same time, and keep them at 1300 ° C for 2 hours. The surface isolation layer of the billet sprayed with release agent will automatically fall off after being released from the furnace, exposing the bright metal substrate. Compared with the billet without spray release agent, the oxidation burning loss per unit area is reduced by 98%, and the pickling time is reduced to 1 / 2 of the original. ...

Embodiment 2

[0027] According to the proportion of 40% zircon, 30% blast furnace slag, 15% nano-silica, 5% borax, 5% nano-strontium hydroxide, 3% silica sol, and 2% sodium alginate, the added water is 50-70% of the aforementioned total weight, the release agent is mixed and ground in a ball mill to obtain the high-temperature anti-oxidation nano-release agent B of the present invention.

[0028] Spray the release agent B on the surface of ferritic stainless steel 1Cr17 at 600°C to form a 50μm off-white isolation layer, put the sprayed billets and unsprayed billets into the furnace at the same time, and keep them at 1200°C for 2 hours. After the steel billet sprayed with release agent is released from the furnace, the surface release agent will automatically fall off, exposing the bright metal substrate. Compared with the steel billet without spray release agent, the oxidation burning loss per unit area is reduced by 95%, and the pickling time is reduced to 2 / 3 of the original.

Embodiment 3

[0030] According to the proportion of 60% zircon, 20% blast furnace slag, 10% nano-silica, 5% borax, 2% nano-strontium hydroxide, 1% silica sol, and 2% sodium alginate, the added water is 60% of the aforementioned total weight, the release agent was mixed and ground in a ball mill to obtain the high-temperature anti-oxidation nano-release agent C of the present invention.

[0031] Spray the release agent C on the surface of martensitic stainless steel 7Cr17 at 800°C to form a 50μm off-white isolation layer, put the sprayed billets and unsprayed billets into the furnace at the same time, and keep them at 1220°C for 1 hour. The surface isolation layer of the billet sprayed with release agent will automatically fall off after being released from the furnace, exposing the bright metal substrate. Compared with the billet without spray release agent, the oxidation burning loss per unit area is reduced by 99%, and the pickling time is reduced to 1 / 3 of the original.

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PUM

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Abstract

The invention relates to a nano-isolation agent for preventing high-temperature surface oxidation of stainless steel. The nano-isolation agent comprises, by weight, 40 to 70% of zircon, 20 to 40% of blast furnace slag, 5 to 30% of nano-silica, 1 to 20% of borax, 0.1 to 5% of nano-strontium hydroxide, 1 to 15% of silica sol, 1 to 3% of sodium alginate and water, wherein the weight of the water is 50 to 70% of the total weight of the above materials. The nano-isolation agent is prepared by a mechanical mixing method. The nano-isolation agent is suitable for preventing oxidation of a stainless steel blank heated at a temperature of 1200 to 1400 DEG C for 1 to 10h, and is spray-coated or brush-coated on the stainless steel surface in a range of a normal temperature to 800 DEG C to form an isolation agent layer having the thickness of 20 to 100 microns. Drying time of the nano-isolation agent in air at a normal temperature of 25 DEG C is in a range 0.5 to 1h. The nano-isolation agent can form compact molten glass thereby preventing diffusion of oxygen atoms to a stainless steel matrix. The nano-isolation agent for preventing oxidation comprises a large amount of zircon and blast furnace slag so that an isolation agent cost and resource consumption are reduced.

Description

technical field [0001] The invention relates to the technical field of anti-oxidation isolating agents, in particular to a high-temperature surface oxidation nano-separating agent for stainless steel. Background technique [0002] Before hot rolling, the steel billet generally needs to be heated for a long time in a heating furnace at 1200 ° C to 1400 ° C. The strong oxidizing atmosphere in the heating furnace will accelerate the oxidation of the steel billet, and the burning loss rate is as high as 0.5% to 3%, such as austenite When stainless steel 316 encounters cooling or uneven temperature in the furnace, part of the oxide layer on the surface is easy to fall off and fall into the heating furnace, causing erosion of the bottom of the furnace. Not only that, because stainless steel contains a large amount of alloying elements Ni, Cr, oxidation It is not easy to completely remove the layer, and there is a chromium-depleted layer in the substrate, so subsequent processes su...

Claims

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Application Information

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IPC IPC(8): C21D1/70
Inventor 沈白李英霞胡羲文
Owner 上海钫淦冶金科技有限公司
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