Method for manufacturing SPA-H high-strength atmospheric corrosion resistance steel by using continuous annealing machine set

A high-strength, weather-resistant steel technology, applied in the direction of rolling mill control devices, furnace types, furnaces, etc., can solve the problems of not being able to produce extremely thin and narrow weather-resistant steel, and achieve the effect of expanding product specifications, high strength, and good extension

Active Publication Date: 2011-11-02
SHOUGANG CORPORATION
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for producing SPA-H high-strength weather-resistant steel by using a continuous annealing unit. When producing SPA-H high-strength weather-resistant s

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  • Method for manufacturing SPA-H high-strength atmospheric corrosion resistance steel by using continuous annealing machine set
  • Method for manufacturing SPA-H high-strength atmospheric corrosion resistance steel by using continuous annealing machine set
  • Method for manufacturing SPA-H high-strength atmospheric corrosion resistance steel by using continuous annealing machine set

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Embodiment Construction

[0023] 1. Hot rolling process: Shougang Qiangang first rolls the products ordered by customers with a thickness range of 1.5-1.6mm on the hot rolling mill to products with a thickness range of 2.3-4.5mm, and then sends them to Shougang Shunyi for cold rolling.

[0024] 2. Acid rolling process: The hot-rolled SPA-H high-strength weathering steel with a thickness of 2.3-4.5mm is rolled into the thickness range required by the customer through welding, pickling, rolling and other processes. The specific process parameters are controlled as follows:

[0025] 1) Tension leveler: The first function of the tension leveler is to remove the scale and break the scale, that is, to directly remove the iron oxide scale on the surface of the strip steel by bending and straightening, or to loosen and damage the iron oxide scale on the surface of the hot-rolled strip steel, which is beneficial to Clean the surface of the strip steel in the subsequent pickling process; the second is to improve...

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Abstract

The invention provides a method for manufacturing SPA-H high-strength atmospheric corrosion resistance steel by using a continuous annealing machine set, belonging to the field of rolling of cold rolled strips. Parameters of a hot rolling process are as follows: the heating temperature is 1180-1260 DEG C, the final rolling temperature is 860+/-20 DEG C, the rolling temperature is 610+/-20 DEG C, and the cold rolling screwdown rate is controlled within a range of 35-60% according to different specifications. The temperature of a continuous annealing heating section is 800+/-20 DEG C, the temperature of a soaking section is 800+/-20 DEG C, the temperature of a slow cooling section outlet is 680+/-20 DEG C, the temperature of a quick cooling section outlet is 430+/-20 DEG C, the temperature of an overageing section is 400+/-20 DEG C, the process speed is 150-200 mpm, the soaking time is 200-250 s, and the leveling elongation is 1.2+/-0.3 %. The method provided by the invention has the following advantages that: the SPA-H high-strength atmospheric corrosion resistance steel generally manufactured on a hot rolling production line in the prior art is successfully manufactured on the continuous annealing machine set by using the cold rolling process while the hot rolling production machine set is affected by factors like limit specifications and mechanical equipment capacities and the like; and the cold rolling process, continuous annealing process and other processes are optimized in such a way that the manufactured high-strength atmospheric corrosion resistance steel has high strength and good elongation.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled strip rolling, in particular to a method for producing SPA-H high-strength weather-resistant steel by using a continuous annealing unit. Background technique [0002] SPA-H high-strength weathering steel is mainly used in the field of container manufacturing, and is often produced by hot rolling process. With the smooth commissioning of hot rolling of Shougang Qiangang and the continuous advancement of product development, at the end of 2008, Shougang Qiangang successfully developed high-strength, high-weather-resistant SPA-H container steel, and soon won a large container customer in Tianjin. bulk orders. Among the large orders placed by customers, there are not only common specification products that are easy to produce, but also some extreme specification orders with a thickness of 1.5-1.6mm and a width of 940-1400mm. The unit, according to the requirements of the hot rolling process, if ...

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Application Information

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IPC IPC(8): C22C38/42C22C38/20C21D9/56C21D1/26B21B37/00
Inventor 陈波尹显东乔建军史静熊爱明张鹏程
Owner SHOUGANG CORPORATION
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