Hot-rolled coil for wheel and preparation method thereof

Abstract

The invention provides a hot-rolled coil for a wheel. The hot-rolled coil is prepared from the following components in percentage by weight: 0.04 to 0.11 percent of C, 0 to 0.05 percent of Si, 0 to 0.5 percent of Mn, 0 to 0.025 percent of P, 0 to 0.015 percent of S, 0.02 to 0.04 percent of Al and the balance of Fe, wherein the ratio of the Mn to the Si is larger than or equal to 8; the ratio of the Mn to the S is larger than or equal to 15. The components of the hot-rolled coil for the wheel are controlled specially, and particularly the ratio of the Mn to the Si and the ratio of the Mn to theS are controlled, so that rolled steel prepared from the special components can be smelted directly through a rotary kiln to obtain a wheel with performance meeting the standard; the tapping temperature is low, LF external refining is avoided, the preparation process is simple, and the cost is low; moreover, sulfide inclusion in the provided hot-rolled coil is low, the problem of cracking occurring in a subsequent wheel preparing process is solved effectively, and the hot-rolled coil has high yield in the preparation of the wheel.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel coils, in particular to a hot-rolled steel coil for wheels and a preparation method thereof. Background technique [0002] HY330CL hot-rolled steel coils for wheel rims (equivalent to the 330CL wheel steel material in the metallurgical industry standard YB / T 4151-2015 hot-rolled steel sheets and steel strips for automobile wheels), after flattening, shearing batching, rolling and flaring, flashing Butt welding, welding joint treatment, roll forming, expansion and sizing, assembly, electrophoresis and other processes are used to make low-speed heavy-duty vehicle wheels. In order to ensure welding performance, the chemical composition design of conventional domestic HY330CL hot-rolled steel coils is usually Low-silicon, low-carbon and high-manganese design, in which carbon ≤ 0.11%, silicon ≤ 0.05%, manganese ≤ 0.50%, and the steelmaking process is treated by LF refining, and the process cos...

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Problems solved by technology

[0003] Although the performance of the hot-rolled steel coil for wheels prepared by the existing technology and production process can meet the requirements of normal use, it has obvious shortcomings. The cost is seriously high and affects production efficiency; the refractory material of the converter is seriously eroded. In order to ensure the full melting of the alloy and the temperature drop in the tapping process, the tapping temperature of the converter needs to be above 1680°C. Because the tapping temperature is too high, the refractory material of the converter is eroded The increase greatly affects the life of the converter; the sulfide inclusion is serious (level 2.5), the cold bending test is easy to crack, and the downstream customers have a high cracking rate of hole expansion, expansion sizing and flash butt welding (cracking rate is about 5%) , which seriously affects the success rate of customers

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