Sulfuric acid dew point corrosion resisting steel capable of avoiding surface cracks and rolling technology of sulfuric acid dew point corrosion resisting steel capable of avoiding surface cracks

Abstract

The invention provides a sulfuric acid dew point corrosion resisting steel capable of avoiding surface cracks and a rolling technology of the sulfuric acid dew point corrosion resisting steel capableof avoiding the surface cracks. Compared with the prior art, according to the steel and the rolling technology thereof, a steel billet is heated in a heating furnace, and the heating furnace is divided into a preheating section, a first heating section, a second heating section, a first soaking section and a second soaking section in the length direction of the furnace; in the furnace, the temperature of the preheating section is lower than or equal to 750 DEG C, the temperature of the first heating section is 600-900 DEG C, the temperature of the second heating section is 850-1000 DEG C, thetemperature of the first soaking section is 1120-1160 DEG C, and the temperature of the second soaking section is 1100-1140 DEG C; and the quick temperature increasing heating time of the preheating section and the first heating section is 55-65 min, the heating time of the second heating section is 25-35 min, and the heat preservation time of the first soaking section and the second soaking section is 90-120 min. Formation of the surface cracks of the steel billet in the heating process is controlled by reasonably optimizing the heating temperature and the heat preservation time, and thus mesh cracks on the surface of rolled materials are avoided.

Description

technical field [0001] The invention belongs to the metallurgy field of steel, and in particular relates to a sulfuric acid dew point corrosion-resistant steel and a rolling process thereof which avoid surface cracks. Background technique [0002] Sulfuric acid dew point corrosion-resistant steel is widely used in the manufacture of economizers and air preheaters serving in high-sulfur flue gas to resist dew point corrosion of sulfur-containing flue gas. At present, the steel pipes used in petroleum refining and chemical enterprises and boiler economizers and air heat exchangers of various power stations are all made of sulfuric acid dew point corrosion resistant steel, and the market prospect is broad. [0003] However, the use environment of sulfuric acid dew point corrosion resistant steel pipe is quite harsh. In the steel pipes in the economizer and the air heat exchanger, the hot side is containing SO 2 and SO 3 The acidic gas, the cold side is air or water at low te...

AI Technical Summary

Problems solved by technology

If it cannot be effectively removed, it will affect the welding performance and service life of the sulfuric acid dew point corrosion resistant steel pipe

[0005] At present, manufacturers widely use nickel element for nickel-copper compounding, which can increase the liquefaction temperature of copper, thereby controlling the surface cracks of round steel, but adding nickel alloy will cause waste of resources and increase cost

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