Continuous annealing unit phosphorus-containing high-strength steel anti-deviation method

Abstract

The invention discloses a continuous annealing unit phosphorus-containing high-strength steel anti-deviation method. The method is characterized by comprising the steps of I, increasing the plate temperature of phosphorus-containing high-strength band steel in a continuous annealing furnace; and II, improving the comparison tension of a first heating section, and adjusting the composition tension of a second heating section and a third heating section, wherein in the step I, the process of increasing the plate temperature of phosphorus-containing high-strength band steel in the continuous annealing furnace comprises the steps of when the thickness of the hosphorus-containing high-strength band steel is smaller than or equal to 0.8 mm, enabling the plate temperature of phosphorus-containing high-strength band steel in the continuous annealing furnace to be 510 DEG C, when the thickness of the hosphorus-containing high-strength band steel is larger than 0.8 mm and smaller than or equal to 1.2 mm, enabling the plate temperature of phosphorus-containing high-strength band steel in the continuous annealing furnace to be 530 DEG C, and when the thickness of the hosphorus-containing high-strength band steel is larger than 1.2 mm, enabling the plate temperature of phosphorus-containing high-strength band steel in the continuous annealing furnace to be 550 DEG C or above. After the method is utilized, the situations that the phosphorus-containing high-strength band steel obviously deviates, speeds down, and scraps the furnace wall are avoided, the smooth production of the phosphorus-containing high-strength band steel is guaranteed, and the production quality and production efficiency of the phosphorus-containing high-strength band steel are improved.

Description

technical field [0001] The invention relates to a method for preventing running deviation of phosphorus-containing high-strength steel in a continuous annealing unit. Background technique [0002] Phosphorus-containing high-strength steel is generally used in automotive inner panel structural parts, and the market demand is relatively large. The monthly demand for H2D2 internal steel in WISCO is about 3,000 tons. Off-tracking will cause the unit to slow down (minimum to 30m / min), and even scrape the furnace wall to cause tension shutdown in the furnace, which seriously affects the production capacity and the smooth running of the unit. [0003] Phosphorus-containing high-strength steel mainly relies on the solid solution of alloying elements such as Mn and P in the base metal to cause a certain degree of lattice distortion to improve the strength and achieve the effect of solid solution strengthening. If the alloying element is a strong carbide forming element (such as Ti, ...

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Problems solved by technology

[0006] After a lot of practice, it has been proved that improving the quality of raw materials has no obvious improvement on the phenomenon of deviation; limiting the heating temperature for a period of time has no obvious improvement on the phenomenon of deviation

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