Antioxidation coating for high temperature billet

Abstract

The invention relates to an antioxidation coating for a high temperature billet. The antioxidation coating comprises an aggregate and a glass washing liquid of which mass is 35 to 60% of mass of the aggregate, wherein the aggregate comprises magnesia brick powder, fused magnesite, quartz sand and high-aluminum powder. The aggregate in the antioxidation coating has ideal high-temperature resistance and water resistance, and does not cause expansion between raw material molecules at a high temperature. The glass washing liquid has excellent adhesion. Therefore, the antioxidation coating does not powder, crack and fall off, is suitable for surface coating of various types of billets and prevents billet oxidation.

Description

technical field

[0001] The invention relates to an anti-oxidation coating used on high-temperature steel slabs. Background technique

[0002] In the process of rolling steel, the steel billet is firstly transported into the heating furnace by means of steel pushing to heat it. For ordinary steel billet rolling, the temperature of the heating furnace is usually set between 1100-1180°C. After the billet is heated to a predetermined temperature, it is transported to the rolling mill for rolling. Because the steel billet can stimulate the activity of iron ions in it at this temperature, making it diffuse from the inside to the outside, and the oxygen atoms in the heating furnace will diffuse to the surface of the billet under the absorption of iron ions. The chemical reaction that occurs after the encounter will produce iron oxides, which include ferric oxide and ferric oxide, and iron oxide, and its chemical formula is: Fe 2 o 3 +Fe 3 o 4 +FeO, the greater the ...

Examples

Embodiment 1

[0016] Take 60Kg of magnesia brick powder, 10Kg of fused magnesia, 10Kg of quartz sand, 20Kg of high alumina powder, and 35Kg of glass water. When making coatings, first grind magnesia brick powder, fused magnesia, quartz sand, and high alumina powder into fine particles of 180 mesh or more, mix the separately ground aggregate particles, and then add Glass water promptly makes the coating proposed by the present invention.

Embodiment 2

[0018] Get 20Kg of magnesia brick powder, 30Kg of fused magnesia, 30Kg of quartz sand, 20Kg of high alumina powder, 60Kg of glass water, and prepare the coating according to the method in Example 1.

Embodiment 3

[0020] Get 30Kg of magnesia brick powder, 30Kg of fused magnesia, 30Kg of quartz sand, 10Kg of high alumina powder, 50Kg of glass water, and prepare the coating according to the method in Example 1.

technical field

[0001] The invention relates to an anti-oxidation coating used on high-temperature steel slabs. Background technique

[0002] In the process of rolling steel, the steel billet is firstly transported into the heating furnace by means of steel pushing to heat it. For ordinary steel billet rolling, the temperature of the heating furnace is usually set between 1100-1180°C. After the billet is heated to a predetermined temperature, it is transported to the rolling mill for rolling. Because the steel billet can stimulate the activity of iron ions in it at this temperature, making it diffuse from the inside to the outside, and the oxygen atoms in the heating furnace will diffuse to the surface of the billet under the absorption of iron ions. The chemical reaction that occurs after the encounter will produce iron oxides, which include ferric oxide and ferric oxide, and iron oxide, and its chemical formula is: Fe 2 o 3 +Fe 3 o 4 +FeO, the greater the ...

Examples

Embodiment 1

[0016] Take 60Kg of magnesia brick powder, 10Kg of fused magnesia, 10Kg of quartz sand, 20Kg of high alumina powder, and 35Kg of glass water. When making coatings, first grind magnesia brick powder, fused magnesia, quartz sand, and high alumina powder into fine particles of 180 mesh or more, mix the separately ground aggregate particles, and then add Glass water promptly makes the coating proposed by the present invention.

Embodiment 2

[0018] Get 20Kg of magnesia brick powder, 30Kg of fused magnesia, 30Kg of quartz sand, 20Kg of high alumina powder, 60Kg of glass water, and prepare the coating according to the method in Example 1.

Embodiment 3

[0020] Get 30Kg of magnesia brick powder, 30Kg of fused magnesia, 30Kg of quartz sand, 10Kg of high alumina powder, 50Kg of glass water, and prepare the coating according to the method in Example 1.