阅读说明：本技术 无磷钢管热轧用高温抗氧化剂及其制备方法 (High-temperature antioxidant for hot rolling of phosphorus-free steel pipe and preparation method thereof ) 是由 岳都元 栾奕 贾志忠 于 2021-09-29 设计创作，主要内容包括：本发明涉及一种钢管加工的抗氧化剂技术领域,特别涉及一种无磷钢管热轧用高温抗氧化剂及其制备方法,包括如下质量比的组分：硬脂酸钙40～50％；硬脂酸镁1～15％；滑石粉10～15％；氮化硅4～8％；硅钡钙2～16％；二氧化锡2～18％；三氧化二锑1～2％,本发明的有益效果是突破传统抗氧化剂含磷酸盐的限制,属于真正意义上的绿色环保抗氧化剂；配方中无硼砂,生产的钢管可以避免硼砂对人体造成的伤害；耐摩擦性好,钢管内壁不会产生划伤。(The invention relates to the technical field of antioxidants for steel pipe processing, in particular to a high-temperature antioxidant for hot rolling of a phosphorus-free steel pipe and a preparation method thereof, wherein the high-temperature antioxidant comprises the following components in percentage by mass: 40-50% of calcium stearate; 1-15% of magnesium stearate; 10-15% of talcum powder; 4-8% of silicon nitride; 2-16% of silicon-barium-calcium; 2-18% of tin dioxide; 1-2% of antimony trioxide, the beneficial effect of the invention is that the limit of phosphate contained in the traditional antioxidant is broken through, and the invention belongs to a real green and environment-friendly antioxidant; the formula has no borax, and the produced steel pipe can avoid the damage of borax to human bodies; the friction resistance is good, and the inner wall of the steel pipe cannot be scratched.)

1. The high-temperature antioxidant for hot rolling of the phosphorus-free steel pipe is characterized by comprising the following components in percentage by mass: 40-50% of calcium stearate; 1-15% of magnesium stearate; 10-15% of talcum powder; 4-8% of silicon nitride; 2-16% of silicon-barium-calcium; 2-18% of tin dioxide; 1-2% of antimony trioxide.

2. The high-temperature antioxidant for hot rolling of phosphorus-free steel pipes according to claim 1, wherein the components are in a mass ratio of: 45% of calcium stearate; 14% of magnesium stearate; 13 percent of talcum powder; 5% of silicon nitride; 3 percent of silicon-barium-calcium; 18% of tin dioxide; and 2 percent of antimony trioxide.

3. The high-temperature antioxidant for hot rolling of phosphorus-free steel pipes as claimed in claim 1, wherein the particle sizes of the component powder raw materials are controlled to be 0.1-5 um.

4. The high-temperature antioxidant for hot rolling of phosphorus-free steel pipes as claimed in claim 1, wherein the calcium stearate is heavy calcium stearate with bulk density of 0.7g/cm or more³The calcium content is more than or equal to 6.4 percent, and the ash content is 9 to 10 percent.

5. The high-temperature antioxidant for hot rolling of phosphorus-free steel pipes as claimed in claim 1, wherein the mass ratio of tin dioxide to antimony trioxide is 85-95: 15-5.

6. The high-temperature antioxidant for hot rolling of phosphorus-free steel pipes as claimed in claim 1, wherein the mass ratio of tin dioxide to antimony trioxide is 90: 10.

7. the high-temperature antioxidant for hot rolling of phosphorus-free steel pipes according to claim 1, wherein the silicon barium calcium is preferably silicon: barium: the mass ratio of calcium is 10: 3: 2.

8. the method for preparing a high-temperature antioxidant for hot rolling of phosphorus-free steel pipes according to any one of claims 1 to 7, comprising the steps of:

step 1, weighing the raw materials according to the mass ratio;

step 2, adding tin dioxide and antimony trioxide into a ball mill according to a proportion, and carrying out ball milling for 2-4 hours;

step 3, adding silicon nitride and silicon barium calcium and ball milling for 1-2 hours;

step 4, finally adding calcium stearate, magnesium stearate and talcum powder, and carrying out ball milling for 1-2 hours;

and step 5, sieving with a 2500-mesh sieve.

Technical Field

The invention relates to the technical field of antioxidants for steel pipe processing, in particular to a high-temperature antioxidant for hot rolling of a phosphorus-free steel pipe and a preparation method thereof.

Background

Under the action of high temperature, the iron element in the steel pipe is oxidized and is FeO and Fe according to the difference of temperature and heating duration₃O₄With Fe₂O₃The formation process of the scale is also a diffusion process of two elements of oxygen and iron, oxygen diffuses from the surface to the inside of the iron, while iron diffuses to the outside, and the two elements meet to form the scale. The scale will scratch the inner wall of the steel pipe, causing the defects and quality reduction of the inner surface of the steel pipe, and making the steel pipe resistThe corrosivity is reduced and the wear rate of the core rod is increased.

Patent 200910148130.9 discloses a borax antioxidant for hot-rolled seamless steel pipe, which can prevent the inner surface of steel pipe from generating scale well, besides, the borax antioxidant has strong reducibility, and can react with generated iron oxide to make the scale in the pipe drop, and meanwhile it also has good lubricating property, and can greatly reduce the scratch of the scale to the inner wall of steel pipe. However, as people pay more attention to environmental protection, the borax antioxidant has a certain influence on the environment, and thus has many limitations in the field of use. Patent 201510678678.X discloses a phosphate type antioxidant for hot-rolled seamless steel pipes, comprising 20-25% by weight of sodium stearate, 25-35% by weight of anhydrous sodium sulphate, 5-10% by weight of talcum powder, 25-35% by weight of glass powder and 15-25% by weight of sodium tripolyphosphate. Although the invention plays a certain role in resisting oxidation, the inner wall of the steel pipe produced by the invention has poor scratch resistance, a large amount of phosphate is used, and the phosphate is dissolved in water in the later treatment process to cause water body pollution.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: overcomes the defects in the prior art and provides a high-temperature antioxidant for hot rolling of a phosphorus-free steel pipe and a preparation method thereof.

The technical scheme for solving the technical problems is as follows:

the high-temperature antioxidant for hot rolling of the phosphorus-free steel pipe comprises the following components in percentage by mass: 40-50% of calcium stearate; 1-15% of magnesium stearate; 10-15% of talcum powder; 4-8% of silicon nitride; 2-16 parts of silicon-barium-calcium; 2-18% of tin dioxide; 1-2% of antimony trioxide.

Preferably, the mass ratio of the components is as follows: 45% of calcium stearate; 14% of magnesium stearate; 13 percent of talcum powder; 5% of silicon nitride; 3 percent of silicon-barium-calcium; 18% of tin dioxide; and 2 percent of antimony trioxide.

Preferably, the particle sizes of the component powder raw materials are controlled to be 0.1-5 um.

Preferably, the calcium stearate is heavy calcium stearate with the bulk density of more than or equal to 0.7g/cm³The calcium content is more than or equal to 6.4 percent, and the ash content is 9 to 10 percent.

Preferably, the mass ratio of the tin dioxide to the antimony trioxide is 85-95: 15-5.

Preferably, the mass ratio of the tin dioxide to the antimony trioxide is 90: 10.

Preferably, the calcium silicobarium is preferably silicon: barium: the mass ratio of calcium is 10: 3:2.

The invention also provides a preparation method of the high-temperature antioxidant for hot rolling of the phosphorus-free steel pipe, which comprises the following steps:

step 1, weighing the components according to the mass ratio;

step 2, adding tin dioxide and antimony trioxide into a ball mill according to a proportion, and carrying out ball milling for 2-4 hours;

step 3, adding silicon nitride and silicon barium calcium and ball milling for 1-2 hours;

step 4, finally adding calcium stearate, magnesium stearate and talcum powder, and carrying out ball milling for 1-2 hours;

and step 5, sieving with a 2500-mesh sieve.

The beneficial effect who adopts above-mentioned scheme is:

(1) the traditional antioxidant contains a large amount of phosphate, and pollutes water in the later washing process, so that the invention breaks through the limitation of the traditional antioxidant containing phosphate, uses high-temperature-resistant silicon nitride, silicon barium calcium, tin dioxide and antimony trioxide for replacement, does not generate phosphorus-containing wastewater in the later period, and belongs to a real green and environment-friendly antioxidant.

(2) The formula of the invention has no borax, and the produced steel pipe can avoid the damage of borax to human body.

(3) The invention introduces the silicon-barium-calcium as the formula for the first time, and the test result shows obvious advantages.

(4) The raw materials used by the invention are all in nano-scale or micro-scale, so that a micro-scale compact layer can be formed more easily.

(5) The antioxidant coating is added into the nano ceramic material, so that the friction resistance is better, and the inner wall of the steel pipe cannot be scratched.

Detailed Description

The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

The invention provides a high-temperature antioxidant for hot rolling of a phosphorus-free steel pipe and a preparation method thereof, wherein the high-temperature antioxidant comprises the following components in percentage by mass: 40-50% of calcium stearate; 1-15% of magnesium stearate; 10-15% of talcum powder; 4-8% of silicon nitride; 2-16 parts of silicon-barium-calcium; 2-18% of tin dioxide; 1-2% of antimony trioxide.

In order to facilitate the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and comparative examples.

Example 1

45kg of calcium stearate; 14kg of magnesium stearate; 13kg of talcum powder; 6kg of silicon nitride; 2kg of silicon-barium-calcium; 18kg of tin dioxide; 2kg of antimony trioxide;

adding tin dioxide and antimony trioxide into a ball mill, and carrying out ball milling for 4 hours; then adding silicon nitride and silicon barium calcium and ball milling for 1 hour, and then adding calcium stearate, magnesium stearate and talcum powder and ball milling for 2 hours; and finally, sieving the mixture by a 2500-mesh sieve.

Example 2

40kg of calcium stearate and 30kg of magnesium stearate; 20kg of talcum powder; 12kg of silicon nitride; 8kg of silicon-barium-calcium; 36kg of tin dioxide; 4kg of antimony trioxide;

adding tin dioxide and antimony trioxide into a ball mill, and carrying out ball milling for 3 hours; then adding silicon nitride and silicon barium calcium and ball milling for 1.5 hours, and then adding calcium stearate, magnesium stearate and talcum powder and ball milling for 1.5 hours; and finally, sieving the mixture by a 2500-mesh sieve.

Example 3

250kg of calcium stearate; 5kg of magnesium stearate; 75kg of talcum powder; 40kg of silicon nitride; 80kg of silicon-barium-calcium; 45kg of tin dioxide; 5kg of antimony trioxide;

adding tin dioxide and antimony trioxide into a ball mill, and carrying out ball milling for 2 hours; then adding silicon nitride and silicon barium calcium and ball milling for 2 hours, and then adding calcium stearate, magnesium stearate and talcum powder and ball milling for 1 hour; and finally, sieving the mixture by a 2500-mesh sieve.

Comparative example 1

Using the composition and processing method of example 1 of patent 200910148130.9 (i.e., the patent mentioned in the background section), borax antioxidant was prepared from borax (Na) in the following composition (by weight ratio)₂B₄O₇.5H₂O) 30%, higher fatty acid RCOOH (R ═ C)₁₂-C₁₈Alkyl) 15%, higher aliphatic alcohol R 'OH (R' ═ C)₁₂-C₁₈Alkyl with hydroxyl value of 275-320%), anhydrous sodium sulfate Na₂SO₄20 percent of calcium oxide, 5 percent of magnesium oxide, and calcium carbonate CaCO₃10 percent. The preparation method comprises the following steps:

a, adding C12-C18 alkyl fatty acid into a reaction vessel, heating until the alkyl fatty acid is completely in a molten state, and adding borax to obtain a mixture of fatty acid sodium salt and boric acid;

b, adding C12-C18 fatty alcohol into the mixture, and reacting to obtain alkyl borate fatty acid sodium salt;

and c, mixing the obtained alkyl borate fatty acid sodium salt with an inorganic filler, drying, cooling and crushing to obtain powder with the granularity of not more than 25 mu m.

Comparative example 2

Using the composition and processing method of example 1 of patent 201510678678.X (i.e. the patent mentioned in the background section), the phosphate type antioxidant is prepared from the following components in the following proportions: 25 weight percent of sodium stearate, 25 weight percent of anhydrous sodium sulphate, 10 weight percent of talcum powder, 25 weight percent of glass powder and 15 weight percent of sodium tripolyphosphate. The phosphate type antioxidant can be obtained by mixing the components and stirring the components evenly.

The test results of example 1, example 2, example 3, comparative example 1, comparative example 2 at 1100 ℃ were analyzed as follows:

through comparison test analysis, the invention not only can reduce the friction coefficient, but also can increase the scratch resistance of the inner wall and obviously reduce the defects of the pipe wall.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.