阅读说明：本技术 一种氧枪表面防粘钢涂层的制备方法及具有防粘钢涂层的氧枪 (Preparation method of anti-sticking steel coating on surface of oxygen lance and oxygen lance with anti-sticking steel coating ) 是由 孙海峰 赵晓峰 张大治 郑佳庆 张凯蒙 于 2018-07-27 设计创作，主要内容包括：本发明公开了一种氧枪表面防粘钢涂层的制备方法及具有防粘钢涂层的氧枪,其中,一种具有防粘钢涂层的氧枪包括氧枪本体,所述氧枪本体包括喷口端的氧枪本体前段和远离喷口端的氧枪本体后段,所述氧枪本体前段外表面喷涂有防粘钢涂层；所述防粘钢涂层由内至外依次为粘结层和陶瓷防粘层；一种氧枪表面防粘钢涂层的制备方法,包括如下步骤：(1)去除表面残余金属；(2)喷砂处理；(3)喷涂粘结层；(4)喷涂陶瓷防粘层；本发明氧枪制造性价比高、使用寿命长,防粘钢涂层防粘钢效果好。(The invention discloses a preparation method of an anti-sticking steel coating on the surface of an oxygen lance and the oxygen lance with the anti-sticking steel coating, wherein the oxygen lance with the anti-sticking steel coating comprises an oxygen lance body, the oxygen lance body comprises an oxygen lance body front section at a nozzle end and an oxygen lance body rear section far away from the nozzle end, and the anti-sticking steel coating is sprayed on the outer surface of the oxygen lance body front section; the anti-sticking steel coating comprises a bonding layer and a ceramic anti-sticking layer from inside to outside in sequence; a preparation method of an anti-sticking steel coating on the surface of an oxygen lance comprises the following steps: (1) removing residual metal on the surface; (2) carrying out sand blasting treatment; (3) spraying a bonding layer; (4) spraying a ceramic anti-sticking layer; the oxygen lance has the advantages of high cost performance, long service life and good steel adhesion preventing effect of the steel adhesion preventing coating.)

1. An oxygen lance with an anti-sticking steel coating is characterized by comprising an oxygen lance body, wherein the oxygen lance body comprises an oxygen lance body front section at a nozzle end and an oxygen lance body rear section far away from the nozzle end, and the anti-sticking steel coating is sprayed on the outer surface of the oxygen lance body front section; the anti-sticking steel coating comprises a bonding layer and a ceramic anti-sticking layer from inside to outside in sequence.

2. The lance of claim 1 wherein the bonding layer is a Ni-Cr superalloy.

3. The lance of claim 2 wherein the bond coat is formed using an oxyacetylene flame spray or plasma spray technique.

4. The lance of claim 1 wherein the ceramic anti-sticking layer is MgO stabilized ZrO₂A composite material.

5. The lance of claim 4 wherein the ceramic anti-stick layer is formed by using oxyacetylene flame spraying or plasma spraying technique.

6. The lance as claimed in any one of claims 1 to 5, wherein the lance body has a front section of 4 to 6 m.

7. The preparation method of the anti-sticking steel coating on the surface of the oxygen lance is characterized by comprising the following steps of: (1) removing residual metal on the surface; (2) carrying out sand blasting treatment; (3) spraying a bonding layer; (4) spraying a ceramic anti-sticking layer; wherein the content of the first and second substances,

(1) removing residual metal on the surface: removing residual metal on the surface of the front section of the oxygen lance body by mechanical grinding or cutting;

(2) sand blasting treatment: then, carrying out sand blasting treatment on the front section of the oxygen lance body to improve the roughness of the oxygen lance body;

(3) spraying a bonding layer: spraying a bonding layer on the surface of the front section of the oxygen lance body by adopting a plasma spraying or oxyacetylene flame spraying technology; the bonding layer is made of Ni-Cr high-temperature alloy;

(4) spraying a ceramic anti-sticking layer: spraying a ceramic anti-sticking layer on the surface of the bonding layer by adopting a plasma spraying or oxyacetylene flame spraying technology; the ceramic anti-sticking layer is made of ZrO stabilized by MgO₂A composite material.

8. The method for preparing an anti-sticking steel coating on the surface of an oxygen lance as claimed in claim 7, wherein the blasting pressure in the blasting treatment in the step (2) is 0.1-0.7MPa, and the blasting particles mainly comprise Al₂O₃The particle size of the granules is 16-120 meshes.

9. The method for preparing the anti-sticking steel coating on the surface of the oxygen lance as claimed in claim 7, wherein when the bonding layer is sprayed by oxyacetylene flame in the step (3), the acetylene pressure is 1.2bar, and the height of a flowmeter ball is 70 mm; the oxygen pressure is 4bar, and the height of the flowmeter ball is 60 mm; the compressed air pressure was 4.5 bar; the spraying distance is 100-120 mm; the powder feeding rate is 4 kg/h; the coating deposition efficiency reaches 80 percent.

10. The method for preparing the anti-sticking steel coating on the surface of the oxygen lance as claimed in claim 7, wherein when the ceramic anti-sticking layer is sprayed by oxyacetylene flame in the step (4), the acetylene pressure is 1.2bar, and the height of a flowmeter ball is 75 mm; the oxygen pressure is 4bar, and the height of the flowmeter ball is 60 mm; the compressed air pressure was 4.5 bar; the spraying distance is 90-130 mm; the powder feeding rate is 1.5 kg/h; the deposition efficiency of the coating can reach 60 percent.

The technical field is as follows:

the invention relates to a preparation method of an oxygen lance surface coating and an oxygen lance with the coating, in particular to a preparation method of an anti-sticking steel coating on the surface of the oxygen lance and an oxygen lance with the anti-sticking steel coating.

Background art:

when the vanadium-titanium magnetite is smelted in a blast furnace, the desulfurization in the furnace is limited to a certain extent, and the product (generally called semisteel) after vanadium extraction from molten iron contains high vanadium and sulfur and low silicon and manganese. In the process of semi-steel blowing, the heat is tense, the slagging element is less, and the slagging is difficult, so that the common splashing phenomenon in the process of converter blowing becomes more prominent. Splashing, particularly metal splashing, causes gun sticking and even sticking of the fire hole and the smoke hood. When the sticking gun is serious, the furnace can only be stopped, the sticking metal is cut off from the oxygen lance, the normal production is seriously influenced, and the production efficiency is low.

At present, the problem of steel sticking is solved by a method of sticking a argil layer on an oxygen lance body, but the thickness of the argil layer is not easy to control, the argil layer is thin and does not work, the coating is thick and is easy to crack, and the practicability is poor. The other method is to solve the problem of steel sticking by changing the material of the gun body, for example, high-grade stainless steel with higher cost is selected. Although the problem of steel sticking is improved by selecting high-grade stainless steel, the high-grade stainless steel is too soft, has poor thermal expansion performance, short service cycle and low overall cost performance, and is not suitable for industrial production.

The invention content is as follows:

the first purpose of the invention is to provide the oxygen lance with the anti-steel coating, which has low cost, long service life and obvious anti-steel effect.

The second purpose of the invention is to provide a preparation method of the anti-sticking steel coating on the surface of the oxygen lance.

The first purpose of the invention is implemented by the following technical scheme: an oxygen lance with an anti-sticking steel coating comprises an oxygen lance body, wherein the oxygen lance body comprises an oxygen lance body front section at a nozzle end and an oxygen lance body rear section far away from the nozzle end, and the anti-sticking steel coating is sprayed on the outer surface of the oxygen lance body front section; the anti-sticking steel coating comprises a bonding layer and a ceramic anti-sticking layer from inside to outside in sequence.

Preferably, the bonding layer is made of Ni-Cr high-temperature alloy.

Preferably, the bonding layer is prepared by using an oxyacetylene flame spraying or plasma spraying technology.

Preferably, the ceramic anti-sticking layer is made of ZrO stabilized by MgO₂A composite material.

Preferably, the ceramic anti-sticking layer is prepared by adopting an oxyacetylene flame spraying or plasma spraying technology.

Preferably, the front section of the oxygen lance body is 6 meters.

The second purpose of the invention is implemented by the following technical scheme: a preparation method of an anti-sticking steel coating on the surface of an oxygen lance comprises the following steps: (1) removing residual metal on the surface; (2) carrying out sand blasting treatment; (3) spraying a bonding layer; (4) spraying a ceramic anti-sticking layer; wherein the content of the first and second substances,

(1) removing residual metal on the surface: removing residual metal on the surface of the front section of the oxygen lance body by mechanical grinding or cutting; the oxygen lance body comprises an oxygen lance body front section at the nozzle end and an oxygen lance body rear section far away from the nozzle end, and the oxygen lance body front section is 6 meters.

(2) Sand blasting treatment: then, carrying out sand blasting treatment on the front section of the oxygen lance body to improve the roughness of the oxygen lance body;

(3) spraying a bonding layer: spraying a bonding layer on the surface of the front section of the oxygen lance body by adopting a plasma spraying or oxyacetylene flame spraying technology; the bonding layer is made of Ni-Cr high-temperature alloy;

(4) spraying a ceramic anti-sticking layer: spraying a ceramic anti-sticking layer on the surface of the bonding layer by adopting a plasma spraying or oxyacetylene flame spraying technology; the ceramic anti-sticking layer is made of ZrO stabilized by MgO₂A composite material.

Specifically, in the sand blasting treatment in the step (2), the sand blasting pressure is 0.1-0.7MPa, and the main component of sand blasting particles is Al₂O₃The particle size of the granules is 16-120 meshes.

Specifically, when the oxyacetylene flame is adopted for spraying the bonding layer in the step (3), the acetylene pressure is 1.2bar, and the height of the flowmeter ball is 70 mm; the oxygen pressure is 4bar, and the height of the flowmeter ball is 60 mm; the compressed air pressure was 4.5 bar; the spraying distance is 100-120 mm; the powder feeding rate is 4 kg/h; the coating deposition efficiency reaches 80 percent; the deposition thickness is 20-60 μm.

Specifically, when the ceramic anti-sticking layer is sprayed by oxyacetylene flame in the step (4), the acetylene pressure is 1.2bar, and the height of the flowmeter ball is 75 mm; the oxygen pressure is 4bar, and the height of the flowmeter ball is 60 mm; the compressed air pressure was 4.5 bar; the spraying distance is 90-130 mm; the powder feeding rate is 1.5 kg/h; the deposition efficiency of the coating can reach 60 percent; the porosity of the coating was about 5%, and the surface roughness was about Ra5 um; the deposition thickness was 100-150 μm.

The invention has the advantages that:

1. the blowing-out cleaning and repairing cost caused by serious gun sticking of the steel slag is reduced, and the production efficiency is improved;

2. the oxygen lance body is made of common steel, so that the cost of raw materials is saved; when the anti-sticking steel coating reaches the service life and cannot be used, the coating is ground off, a new coating is sprayed on the oxygen lance body again for continuous use, the oxygen lance body does not need to be replaced, and the use cost of equipment is reduced;

3. the bonding layer made of the nickel-chromium alloy has higher oxidation resistance, can effectively absorb the expansion of the oxygen lance body caused by heating, and can prolong the service life of the ceramic anti-sticking layer;

4. the ceramic coating has the characteristics of no slag adhering and high temperature resistance, can effectively prevent steel slag from splashing and adhering to a gun body, has good steel adhesion resistance and long service life, and reduces the slag adhering period from twenty-three to twenty-four times in the original twenty-four hours to three to four times in twenty-four hours;

5. the total length of the oxygen lance body is 26 meters, the slag adhesion of the front 4-6 meters is the most serious, and the slag adhesion of the rear end is basically avoided, only 5 meters of the front section of the oxygen lance body is reformed and sprayed, so that the manufacturing cost is greatly reduced;

6. after the anti-sticking steel coating is sprayed, the service life of the gun body can be prolonged to three to four times of the original service life.

Description of the drawings:

FIG. 1 is a schematic structural view of an oxygen lance with an anti-stick steel coating according to example 1.

FIG. 2 is a schematic view of the construction of a lance of example 2 having a coating of anti-stick steel.

FIG. 3 is a schematic view of the construction of a lance of example 3 having a coating of anti-stick steel.

The oxygen lance comprises an oxygen lance body front section 1, an oxygen lance body rear section 2, an outer sleeve steel pipe 2-1, an oxygen lance barrel front section 2-2, a bonding layer 3, a ceramic anti-sticking layer 4, a connecting weld crater 5, a guide clamping block 6, a guide groove 7, an annular groove 8, a first mark boss 9 and a second mark boss 10.

The specific implementation mode is as follows: