Thin hot-rolled pickled steel with good formability and production method thereof

Abstract

The invention relates to a thin hot-rolled pickled steel with good formability, which comprises the following chemical components by weight percent (wt%): 0.04-0.07% of C, 0.10-0.30% of Si, 0.41-0.60% of Mn, 0.025% of P or less, 0.012% of S and 0.010-0.030% of Als. The preparation method of the thin hot-rolled pickled steel with good formability comprises the following steps: desulphurizing molten iron, smelting by a converter, alloying, treating by a ladle furnace, casting and rolling continuously, dephosphorizing high-pressure water, controlling rolling, cooling by laminar flow, curling, pickling by acid levelling and finishing adopting static oil removal. The produced hot-rolled pickled steel which has the tensile strength of 370MPa or higher and the thickness of 1.8 mm or lower, is low production difficulty and good in surface quality and is convenient to weld, oil and paint. In addition, the thin hot-rolled pickled steel has the advantages of good punch formability, high forming size accuracy, short production cycle, high yield and low cost.

Description

technical field [0001] The invention relates to steel for automobiles, in particular to a hot-rolled pickled steel for automobiles with a thickness of ≤1.8mm and a tensile strength of ≥370MPa and a production method thereof. Background technique [0002] Hot-rolled pickled steel refers to the steel plate (coil) obtained by using hot-rolled materials as raw materials to remove the surface oxide scale by pickling, and after trimming, smoothing and oiling. It has the following characteristics: [0003] 1. Cost reduction, replacing cold-rolled sheets with pickled sheets can save costs for enterprises. 2. The surface quality is good. Compared with ordinary hot-rolled sheets, hot-rolled pickled sheets have removed surface oxide scale, improved the surface quality of steel, and are convenient for welding, oiling and painting. 3. High dimensional accuracy and good plate shape. After smoothing and finishing, the width and thickness accuracy are greatly improved, and the plate sh...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems that the steel used for automotive structural parts with the thickness ≤ 1.8 millimeters is difficult to produce in a conventional hot rolling line, the equipment load is large, scrap steel is easily generated, and the cost is high. Provide a thin-gauge hot-rolled pickled steel with good formability, stable production of steel plates with a thickness of ≤1.8 mm, yield ratio not exceeding 0.8, excellent stamping performance, good surface quality, and no steel leakage during continuous casting, and its production method

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