Production method of black steel for 510L automobile frame

Abstract

The invention discloses a production method of black steel for a 510L automobile frame, belonging to the technical field of sheet rolling. Through control over components and a rolling process, the ratio of Fe3O4 in a surface iron scale structure of a coiled sheet is over 80 percent, and the thicknesses of the iron scales are less than 10 mum. The black steel comprises the following components in percentage by weight 0.06-0.14 percent of C, less than 0.2 percent of Si, 1.2-1.6 percent of Mn, less than 0.02 percent of P, less than 0.010 percent of S, 0.01-0.05 percent of Nb, 0.02-0.06 percent of Alt, less than 0.2 percent of Si and the balance of Fe. The rolling process is controlled as follows: the plate blank heating temperature is controlled at 1,230-1,270 DEG C, the heating time is 3-3.5 hours, the rough descaling temperature is over 1,173 DEG C, the pressure of a descaling system is controlled over 18 MPa, a double-row descaling process is adopted, the RT2 temperature is controlled at 1,040-1,080 DEG C, the final rolling temperature is controlled at 860-880 DEG C, a pre-cooling mode is adopted for laminar flow, and the coiling temperature is controlled at 540-580 DEG C.

Description

technical field [0001] The invention belongs to the technical field of thin plate rolling, and in particular relates to a production method of black steel for 510L automobile girders, which effectively controls the thickness and structure of the surface oxide scale of the black steel for 510L automobile girders. Background technique [0002] With the continuous development of the automobile industry, the requirements for steel materials are also getting higher and higher. While ensuring good comprehensive mechanical properties, the steel plate is required to have excellent surface quality. At present, some manufacturers such as Japan's Nippon Steel provide automobile girder plates to automobile factories, which are high-surface-quality steel plates with a strong surface oxide layer and are suitable for direct stamping of girders, and have been mass-produced stably. Automobile factories can avoid the pickling process, which is environmentally friendly and reduces costs. For...

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Problems solved by technology

At present, Baosteel is also conducting research in this area, but the effect is not satisfactory

Anshan Iron and Steel Co., Ltd. has carried out preliminary test work, but there is a large gap with the surface of Japanese steel plates.

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