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Nickel-free weather-resistant steel and method for preparing hot rolled plate thereof

A technology of weathering steel and manufacturing method, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of high cold crack index and poor welding performance, and achieve the effect of cost reduction

Active Publication Date: 2010-10-20
SHANGHAI MEISHAN IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It mainly solves technical problems such as the high content of C, Si and Mn in the existing nickel-free weathering steel, which will lead to high cold crack index and poor welding performance.

Method used

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  • Nickel-free weather-resistant steel and method for preparing hot rolled plate thereof
  • Nickel-free weather-resistant steel and method for preparing hot rolled plate thereof
  • Nickel-free weather-resistant steel and method for preparing hot rolled plate thereof

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Experimental program
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Effect test

preparation example Construction

[0022] The preparation method of the low-cost weather-resistant steel adopts electric furnace or converter conventional smelting, and controls the content of key alloy elements and the heating process. From the actual rolling results of hot rolling, the edge and surface quality of the example are better, and the mechanical properties of the example are equivalent to 09CuPCrNi.

[0023] Table 3 embodiment heating system

[0024]

Embodiment and 09

[0025] The mechanical property of table 4 embodiment and 09CuPCrNi

[0026]

[0027] figure 1 , 2 The analysis results of the polarization curves are shown in Table 5. It can be seen that by reducing the C, S elements and Si-increasing elements in the example, the corrosion resistance under the two corrosion times is significantly better than that of the comparative example 09CuPTiRe, and the corrosion rate drops by nearly 50%, which is basically similar to 09CuPCrNi, or even slightly higher .

[0028] The polarization curve calculation result of table 5 embodiment and comparative example

[0029]

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Abstract

The invention provides nickel-free weather-resistant steel and a method for preparing a hot rolled plate thereof, and mainly solves the technical problems of high cold crack index, not very good welding performance and the like due to high C, Si and Mn content of the conventional nickel-free weather-resistant steel. The technical scheme is that: the weather-resistant steel comprises the following alloying ingredients in percentage by weight: 0.05 to 0.10 percent of C, 0.35 to 0.50 percent of Si, 0.38 and 0.50 percent of Mn, 0.07 to 0.11 percent of P, less than 0.010 percent of S, 0.45 to 0.60 percent of Cr, 0.25 to 0.45 percent of Cu, 0 to 50ppm of B, and the balance of Fe. The nickel-free weather-resistant steel of the invention is mainly used for replacing high-grade 09CuPCrNi weather-resistant steel.

Description

Technical field: [0001] The invention belongs to the technical field of weathering steel, and in particular relates to a nickel-free weathering steel with comprehensive properties such as good mechanical properties, impact properties, welding performance and corrosion resistance and a hot-rolled sheet manufacturing technology thereof. Background technique: [0002] At present, there have been many invention patent reports on weathering steel at home and abroad. In addition to adding Cu and P elements that can improve corrosion resistance, the composition design idea mainly adopts two routes. A kind of precious metal alloy elements such as Cr, Ni, V, Ti, etc., wherein, the Cr element can improve the mechanical and corrosion resistance, and the Ni element can not only improve the corrosion resistance, but also effectively inhibit the selective oxidation of the copper element due to high temperature (selective oxidation) Iron in the steel, while copper is not oxidized), preven...

Claims

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Application Information

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IPC IPC(8): C22C38/20C22C38/32C22C33/04C21D8/02B21B37/28B21B45/04
Inventor 吴浩方何宜柱万兰凤张晖卞皓穆海玲
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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