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High-strength cold-roll phase-change plastic steel plate with good plasticity and preparation method thereof

A high-strength, plastic technology, applied in the direction of temperature control, etc., can solve the problem of deteriorating the surface quality of the slab, and achieve the effects of poor surface immersion plating, good plasticity, and improved welding performance

Inactive Publication Date: 2010-12-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the increase of Al and N content will deteriorate the surface quality of the slab

Method used

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  • High-strength cold-roll phase-change plastic steel plate with good plasticity and preparation method thereof
  • High-strength cold-roll phase-change plastic steel plate with good plasticity and preparation method thereof
  • High-strength cold-roll phase-change plastic steel plate with good plasticity and preparation method thereof

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Embodiment Construction

[0014] The preparation process of the high-strength cold-rolled phase-change plastic steel plate with good plasticity used in the embodiment of the present invention includes: converter smelting, LF furnace refining, continuous casting of slabs with a thickness of 135 mm or more, hot rolling at 1000-1250 ° C, and the final rolling temperature The temperature is 760-900°C, the coiling temperature is 560-700°C, and then cold-rolled at a cumulative reduction of 40%-80%, to make a steel plate with a thickness of 0.5-2.0mm. Then heat treatment: the cold-rolled steel plate is held at 710-850°C for 1-6 minutes, then rapidly cooled to 330-500°C at a rate of 10-50°C / s and held for 5-20 minutes, and finally heated at 5-20°C / s s rate air cooling to room temperature, you can get a high-strength cold-rolled phase-change plastic steel plate with good plasticity. The composition of the steel grades of the embodiments of the present invention is shown in Table 1, the annealing system is shown...

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Abstract

The invention provides a high-strength cold-roll phase-change plastic steel plate with good plasticity and a preparation method thereof. The plastic steel plate comprises the following chemical components: 0.05-0.3% of C, 0.1-0.6% of Si, 0.5-2.0% of Mn, 0.04-0.1% of P, 0.06-0.2% of RE, 0.01-0.03% of N, two or more than two of 0.01-0.5% of V, 0.01-0.5% of Ti and 0.01-0.5% of Nb and the balance of Fe and inevitable impurities. The preparation method comprises the following steps of: (1) smelting and casting blanks; (2) rolling: heating to 1100-1250 DEG C, maintaining the temperature for 2-4 h, starting rolling at 1100 DEG C, finishing rolling at 760-900 DEG C and coiling at 560-700 DEG C, wherein the accumulated rolling reduction for cold rolling is 40-80%; and (3) thermal treatment: isothermally treating at 710-850 DEG C for 0.5-6 min, quickly cooling to 330-500 DEG C with the rate of 10-50 DEG C / s, isothermally treating for 0.5-20 min and cooling to room temperature with the rate of 5-20 DEG C / s. The steel plate also has good weldability, thermal immersion plating property and surface quality.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy products, and in particular relates to a high-strength cold-rolled phase-change plastic steel and a preparation method thereof. Background technique [0002] As energy and environmental issues have caused changes in the automotive industry to reduce vehicle weight, people have begun to replace mild steel with high-strength steel (HSS), which can effectively reduce vehicle weight and fuel consumption without reducing safety and reliability. Among these high-strength steels, transformation-induced plasticity steel (TRIP steel) has attracted wide attention from major steel companies and automobile companies for its unique strengthening and toughening mechanism. The preparation principle of cold-rolled TRIP steel is: through alloy composition design and process control, a multi-phase steel containing ferrite, bainite and retained austenite is prepared, and the phase transformation of...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/12C21D8/02B21B37/74
Inventor 郭金宇刘仁东唐复平王义栋王越高毅史乃安黄大鹏王旭林利王科强
Owner ANGANG STEEL CO LTD