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High-temperature protective coating for high-carbon steel billet and application thereof

A technology for protective coatings and high carbon steel, applied in the field of refractory coatings, can solve the problems of limited high temperature oxidation resistance, large expansion coefficient of magnesia, slow application process of oxidation coatings, etc., to improve thermal shock stability and dense coating. Effect

Inactive Publication Date: 2014-12-03
辽宁富城耐火材料(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, scientific and technological workers have carried out a lot of research on anti-oxidation coatings for steel billet heating, but most of the existing anti-oxidation coatings are magnesium or clay coatings. The health of personnel is harmful, and magnesium oxide has a large expansion coefficient and poor thermal shock resistance. It is easy to crack when spraying hot billets online. At the same time, this kind of coating has poor anti-decarburization effect on high-carbon steel (carbon content greater than 0.6%) Clay-based coatings have limited high-temperature anti-oxidation ability due to more impurities introduced by clay, and at the same time need to introduce pure zirconia, which is costly.
[0004] Therefore, there are the following problems in the existing steel billet anti-oxidation coating: 1, easy cracking to hot state steel billet spraying, most of coatings are water-based paints, because raw material or bonding agent make coating easy to crack when directly spraying on the hot state steel billet surface, can not carry out On-line spraying affects the production rhythm of rolling mills, so the promotion and application of anti-oxidation coatings in rolling mills is slow
2. Poor anti-oxidation effect
Oxidized iron scales are formed on the sprayed surface, and the oxided iron scales are easy to collapse when heated in the heating furnace, making the coating layer sprayed on it useless, resulting in poor anti-oxidation effect
3. Single function
Most of the anti-oxidation coatings currently on the market can only be effective against oxidation and burning of steel billets, and have poor anti-decarburization effect on the surface of steel billets

Method used

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  • High-temperature protective coating for high-carbon steel billet and application thereof
  • High-temperature protective coating for high-carbon steel billet and application thereof
  • High-temperature protective coating for high-carbon steel billet and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 A high-temperature protective coating for high-carbon steel slabs and its application

[0031] (1) Formula composition

[0032] The dry powder is composed as follows in parts by weight:

[0033]

[0034]

[0035] The binder is composed of a solid composite binder and a liquid composite binder. The solid composite binder is composed of dextrin and sodium lignosulfonate in a weight ratio of 2.2:1, and its addition amount is 4% of the total weight of the dry powder; The liquid composite binder is composed of aluminum sol, silica sol and liquid aluminum dihydrogen phosphate in a weight ratio of 1:0.4:0.6, and its added amount is 3% of the total weight of the dry powder.

[0036] (2) Preparation method

[0037] Grind each dry powder first, pass through a 325-mesh sieve, take the sieve, weigh it according to the weight ratio, and put it into the mixer together with the solid composite binder to mix, add an appropriate amount of water to stir, stir evenly, an...

Embodiment 2

[0042] Example 2 A high-temperature protective coating for high-carbon steel slabs and its application

[0043] (1) Formula composition

[0044]The dry powder is composed as follows in parts by weight:

[0045]

[0046] The binder is composed of a solid composite binder and a liquid composite binder. The solid composite binder is composed of dextrin and sodium lignosulfonate in a weight ratio of 2.2:1, and its addition amount is 5% of the total weight of the dry powder; The liquid composite binder is composed of aluminum sol, silica sol and liquid aluminum dihydrogen phosphate in a volume ratio of 1:0.4:0.6, and its added amount is 4% of the total weight of the dry powder.

[0047] (2) Preparation method

[0048] Grind each dry powder first, pass through a 325-mesh sieve, take the sieve, weigh it according to the weight ratio, and put it into the mixer together with the solid composite binder to mix, add an appropriate amount of water to stir, stir evenly, and then add li...

Embodiment 3

[0053] Embodiment 3 selection test of binding agent

[0054] 1. Selection of binder

[0055] The method is the same as that of Example 1, and only the type of binding agent is changed for implementation. The results are shown in Table 1. In the blank test, the steel billet was directly put into the heating furnace for heat treatment without spraying paint, and the results are shown in Table 1.

[0056] Table 1 Effects of binders on the effect of high-temperature protective coatings for high-carbon steel slabs.

[0057]

[0058] 2. Screening of the composite ratio of each component in solid and liquid composite binders

[0059] The method is the same as in Example 1, except that the composite ratio of each component in the solid and liquid composite binder is changed, and the blank test is that the steel billet is not sprayed with paint, and directly enters the heating furnace for heat treatment. The results are shown in Table 2.

[0060] Table 2 The effect of the composi...

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Abstract

The invention discloses a high-temperature protective coating for a high-carbon steel billet. The coating comprises a dry powder material and an adhesive. The dry powder material is prepared from the following components in parts by weight: 30-50 parts of corundum carbon-free waste brick materials, 10-12 parts of electro-fused mullite, 25-30 parts of fused alumina zirconia waste brick materials, 8-10 parts of silicon carbide, 3-6 parts of soft clay, 3-6 parts of kyanite and 2-4 parts of sodium polyacrylate. The adhesive is prepared from a solid compound adhesive and a liquid compound adhesive. The dosage of the solid compound adhesive is 3-6% of the total weight of the dry powder material and the dosage of the liquid compound adhesive is 2-4% of the total weight of the dry powder material. The protective coating can be used for directly spraying the hot state billet with the surface temperature of 400-1100 DEG C, and not only has the double functions of preventing oxidization and resisting decarburization, but also has the self-repairing ability, so that the loss of iron scale and the thickness of a decarburized layer in the heating process of the high-carbon steel billet are remarkably reduced, the surface quality of the billet is improved. The production efficiency of a rolling mill is improved, and the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of refractory coatings, in particular to a high-temperature protective coating applied to a high-carbon steel slab to form a protective coating during rolling. Background technique [0002] Billets and ingots are generally heated or soaked in a heating furnace with an oxidizing atmosphere at around 1200°C before rolling. The heating time is 2 to 3 hours or even longer. A strong oxidation reaction occurs to generate a large amount of oxide scale, resulting in a significant decrease in the yield and surface quality of the steel, and a thicker decarburized layer of high-carbon steel. Therefore, spraying or brushing high-temperature paint on the surface of the billet to form a stable anti-oxidation coating is the most direct method proposed by researchers to address the above problems. [0003] In recent years, scientific and technological workers have carried out a lot of research on steel billet heating anti-...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12C09D5/00
Inventor 聂波华戴晨晨陶春兰
Owner 辽宁富城耐火材料(集团)有限公司
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