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High-phosphorous weather-proof steel cast-rolling thin strip with negative phosphorous segregation on surface and preparation method thereof

A weathering steel, negative segregation technology, applied in the field of steel casting and rolling, can solve problems such as the difficulty of eliminating phosphorus segregation

Inactive Publication Date: 2010-03-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional process, it is very difficult to eliminate phosphorus segregation

Method used

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  • High-phosphorous weather-proof steel cast-rolling thin strip with negative phosphorous segregation on surface and preparation method thereof
  • High-phosphorous weather-proof steel cast-rolling thin strip with negative phosphorous segregation on surface and preparation method thereof
  • High-phosphorous weather-proof steel cast-rolling thin strip with negative phosphorous segregation on surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The steps of the preparation method of the high-phosphorus weathering steel thin strip with negative segregated phosphorus on the surface (i.e., the surface is rich in phosphorus) of the present embodiment are as follows:

[0041] 1. Smelting, refining

[0042] According to the ingredients of Table 2.

[0043] Preheat the raw material to 300°C, put it into the smelting furnace, and smelt it under the protection of inert gas; when the temperature of the molten steel in the smelting furnace is 1600°C, add a slag remover and refine it under the protection of inert gas. The refining time is 2 minutes; the molten steel after refining is left to stand for 2 minutes to obtain refined molten steel.

[0044] The above-mentioned inert gas is selected from helium, the pressure is 2.0MPa, and the slag remover is selected from perlite thermal insulation slag remover, and its consumption is 0.6% by weight of the molten steel.

[0045] 2. Preparation of cast-rolled strip

[0046] T...

Embodiment 2

[0057] The steps of the preparation method of the high-phosphorus weathering steel thin strip with negative segregated phosphorus on the surface (i.e., the surface is rich in phosphorus) of the present embodiment are as follows:

[0058] 1. Smelting, refining

[0059] According to the ingredients of Table 2.

[0060] Preheat the raw material to 100°C, put it into the smelting furnace, and smelt it under the protection of inert gas; when the temperature of the molten steel in the smelting furnace is 1540°C, add a slag remover, and refine it under the protection of inert gas. The refining time is 30 minutes; the molten steel after refining is left to stand for 20 minutes to obtain refined molten steel.

[0061] The above-mentioned inert gas is selected from argon, and the pressure is 0.3 MPa. The slag remover is selected from perlite thermal insulation slag remover, and its consumption is 0.4% by weight of the molten steel.

[0062] 2. Preparation of cast-rolled strip

[0063...

Embodiment 3

[0074] The steps of the preparation method of the high-phosphorus weathering steel thin strip with negative segregated phosphorus on the surface (i.e., the surface is rich in phosphorus) of the present embodiment are as follows:

[0075] 1. Smelting, refining

[0076] According to the ingredients of Table 2.

[0077] Preheat the raw materials to 200°C, put them into a smelting furnace, and smelt them under the protection of an inert gas; when the temperature of the molten steel in the smelting furnace is 1600°C, add a slag remover and refine them under the protection of an inert gas. The refining time is 15 minutes; the molten steel after refining is left to stand for 15 minutes to obtain refined molten steel.

[0078] The above-mentioned inert gas is selected from argon, and the pressure is 1.0 MPa. The slag remover is selected from perlite thermal insulation slag remover, and its consumption is 0.5% by weight of the molten steel.

[0079] 2. Preparation of cast-rolled stri...

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Abstract

The invention relates to a high-phosphorous weather-proof steel cast-rolling thin strip with negative phosphorous segregation on the surface and a preparation method thereof. The chemical components of the thin strip in terms of percentage by mass are as follows: 0.061-0.099% of C, 0.15-0.75% of SiO, 0.20-0.49% of Mn, 0.07-0.30% of P, 0.02% or less of S, 0.25-0.50% of Cu, 0.30-1.25% of Cr, 0.12-0.65% of NiO, and Fe as remainder. The preparation method of the thin strip comprises the following steps of: melting, refining, casting and rolling the refining liquid steel by a double-roller thin strip casting and rolling device, and controlling the cast-on temperature at 1540-1600 DEG C and the casting and rolling speed at 12-60m / min, and presetting the roll-gap as 1-4mm; obtaining the cast-rolling strip with negative phosphorous segregation on the surface, with a thickness of 1-5mm; and then cold-rolling and annealing. The negative phosphorous segregation on the surface guarantees the strength and the plasticity of the thin strip and also greatly improves the anti-corrosion performance of the thin strip; the ductile-to-brittle transition temperature of the high-phosphorous weather-proofsteel cast-rolling thin strip with negative phosphorous segregation on the surface is about 10 DEG C lower than that of the products produced by common processes, and the tenacity of steel is improved.

Description

technical field [0001] The invention belongs to the technical field of steel casting and rolling, and in particular relates to a high-phosphorus weather-resistant steel casting and rolling thin strip and a preparation method thereof. Background technique [0002] With the introduction of concepts such as ecological economy and circular economy, it is more urgent to effectively recycle scrap steel. Phosphorus is one of the most important inclusion elements in steel scrap, and it is easy to form segregation in the conventional slab production process, resulting in severe brittleness. Therefore, the effective recovery of scrap steel lies in how to increase the phosphorus content in steel without causing destructive effects. On the other hand, phosphorus does not always play a harmful role. As long as the adverse effects of phosphorus segregation can be eliminated, its solid solution strengthening and corrosion resistance can be exerted. However, it is very difficult to elimi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C33/04B22D11/06C21D8/02C21D1/26
Inventor 刘振宇周国平邱以清曹光明李成刚王国栋
Owner NORTHEASTERN UNIV
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