Heat-preserving time adjusting method for hot galvanizing unit alloying furnace

Abstract

The invention relates to the technical field of hot-galvanizing unit alloying, in particular to a heat-preserving time adjusting method for a hot galvanizing unit alloying furnace. A plurality of gas sealing spraying nozzles are arranged in a vertical heating chamber in the length direction in which a hot galvanizing steel plate is placed. Circulation of vertical gas of the gas sealing spraying nozzles is sealed through cold gas sprayed out of the gas sealing spraying nozzles; rising of hot air is cut off; and a cooling spraying pipe is arranged on the upper portion of each gas sealing spraying nozzle in a matched manner and used for jetting cold air so that the hot galvanizing steel plate cutting off hot air can be cooled. According to the heat-preserving time adjusting method, the length of a heating chamber is not changed, and the running speed of the hot galvanizing steel plate is not changed; and due to the fact that cooling gas is added in the soaking zone of the hot galvanizing unit alloying furnace and used for sealing, when alloying products are produced, the heat preserving time of the soaking zone can be shortened while the temperature of a unit is lowered.

Description

technical field [0001] The invention relates to the technical field of alloying of a hot-dip galvanizing unit, in particular to a method for adjusting the holding time of an alloying furnace of a hot-dip galvanizing unit. Background technique [0002] Hot-dip galvanized alloyed products refer to steel sheets whose surface coating is Zn-Fe alloy. The production process is to anneal and heat the steel plate after hot-dip galvanizing, so that the coating on the surface continues to undergo Zn-Fe diffusion reaction at 500-550 °C until the pure zinc layer on the surface of the coating disappears and is completely transformed into a Zn-Fe alloy. Floor. The structure of the coating is changed to improve its performance. [0003] Since the alloyed hot-dip galvanized product contains 8-12% Fe in the Zn-Fe alloy layer, it has good welding performance and has anti-rust ability after painting. The disadvantage is that due to the difference in the internal phase structure of the Zn-Fe...

AI Technical Summary

Problems solved by technology

[0006] Since the length of the soaking section of the alloying furnace of the hot-dip galvanizing unit is fixed, when producing hot-dip galvanized alloyed products, the holding time of the soaking section will be extended with the decrease of the group speed, and too long holding time will cause the alloy The г phase in the coating of the alloyed product grows too much, and the anti-powdering performance is weakened, which will lead to powdering of the alloyed product during molding

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