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Bearing steel high temperature heating protective coating and using method thereof

A technology for high-temperature heating and coating protection, applied in coating and other directions, can solve problems such as billet sticking to steel, billet oxidative burning problems, etc.

Inactive Publication Date: 2012-07-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steel billet treated with the patented coating still has the problem of sticking steel in the heating furnace
In Russia, a protective coating has been developed to prevent decarburization of rolling bearing steel during heating. For low-sulfur phosphorus content (0.006% S and 0.012% P by weight) ShKh15 steel is suitable for use at 500-1140°C. The type of coating has been studied, but it cannot solve the problem of bearing steel sticking to steel in the pusher type heating furnace, and the effect of this coating on the problem of oxidation and burning of steel billets is not obvious.

Method used

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  • Bearing steel high temperature heating protective coating and using method thereof
  • Bearing steel high temperature heating protective coating and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Divide the continuous casting high-carbon chromium bearing steel billet with the same batch number of 200×200 mm in section into two parts, one part of the billet is not treated with protective coating, and the other part of the billet is directly sprayed on the surface with the protective coating of the present invention, and the two parts of the billet are Send them together into a pusher-type heating furnace for heating. The heating time is 3 to 5 hours. The maximum temperature in the heating furnace is 1260 ° C, and the holding time of the high temperature section above 1200 ° C is 80 min. The specific operation method is:

[0018] 1) According to the weight percentage, the content is: MgO: 55%, CaO: 8%, TiO 2 : 30%, P 2 o 5 : 4%, Na 2 O: 3%, configure solid components;

[0019] 2) reconcile the solid component with water equivalent to 40% by weight of the solid component to make a slurry;

[0020] 3) Then, under the condition that the surface temperature of th...

Embodiment 2

[0023] Divide the continuous casting high-carbon chromium bearing steel billet with the cross-section specification of 200×200mm in the same batch number into two parts, one part of the billet is not treated with protective coating, and the other part of the billet is directly sprayed on the surface with the protective coating of the present invention, and then the two parts are The steel billets are sent together into the push steel heating furnace for heating. The heating time is 3 to 5 hours. The maximum temperature in the heating furnace is 1260°C, and the holding time of the high temperature section above 1200°C is 80 minutes. The specific operation method is:

[0024] 1) According to the weight percentage, the content is: MgO: 75%, CaO: 6%, TiO 2 : 11.5%, P 2 o 5 : 5%, Na 2 O: 2.5% configured solid components;

[0025] 2) reconcile the solid component with water equivalent to 30% by weight of the solid component to make a slurry;

[0026] 3) Then, under the conditio...

Embodiment 3

[0029] Divide the continuous casting high-carbon chromium bearing steel billet with the cross-section specification of 200×200mm in the same batch number into two parts, one part of the billet is not treated with protective coating, and the other part of the billet is directly sprayed on the surface with the protective coating of the present invention, and then the two parts are The steel billets are sent together into the push steel heating furnace for heating. The heating time is 3 to 5 hours. The maximum temperature in the heating furnace is 1260°C, and the holding time of the high temperature section above 1200°C is 80 minutes. The specific operation method is:

[0030] 1) According to the weight percentage, the content is: MgO: 63%, CaO: 9%, TiO 2 : 18%, P 2 o 5 : 5%, Na 2 O: 5%, configure solid components;

[0031] 2) reconcile the solid component with water equivalent to 25% by weight of the solid component to make a slurry;

[0032] 3) Then, under the condition th...

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Abstract

The invention discloses a bearing steel high temperature heating protective coating and a using method thereof. The protective coating comprises the following components in percentage by weight: 55 to 75 percent of MgO, 6 to 25 percent of CaO, 10 to 30 percent of TiO2, 4 to 10 percent of P2O5 and 2.5 to 7.5 percent of Na2O. The protective coating can effectively prevent bearing steel from being adhered to a pusher-type heating furnace or subjected to oxidation burning loss, and the using method of the protective coating is simple, easy to operate and good in effect.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and specifically refers to a high-temperature heating protective paint for bearing steel and its application method. Background technique [0002] Before the rolling mill produces bearing steel by hot rolling, the cast slab needs to be heated at high temperature for a long time, and the heating temperature even reaches 1200-1260 °C. When the bearing steel is heated by a pusher type heating furnace, the steel sticking problem is likely to occur, resulting in the billet sticking in the heating furnace and cannot be pushed out smoothly, which will disrupt the production order of the entire rolling mill and greatly reduce the production efficiency of the steel mill. At the same time, the bearing steel is heated at high temperature for a long time, the surface is oxidized seriously, and the oxide scale formed is thicker, and the oxidation burning loss is obvious, resulting in the los...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/00C21D1/70
Inventor 罗国华陈华圣范植金朱玉秀徐志东王瑞敏
Owner 武汉钢铁有限公司
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