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Low-nickel-content atmospheric corrosion resistant steel and preparation method thereof

A technology of atmospheric corrosion-resistant steel and nickel content, applied in the direction of improving process efficiency, etc., can solve the problems of poor formability and weldability, high cost of corrosion-resistant steel, poor strength and toughness matching, etc., and achieve excellent formability, excellent Performance, the effect of meeting the needs of use

Inactive Publication Date: 2020-05-05
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a low-nickel-content atmospheric corrosion-resistant steel and its preparation method to solve the problems of high cost, poor formability and weldability, easy occurrence of "copper brittle" defects, strong Problems such as poor toughness matching

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preparation example Construction

[0059] The present invention also provides a method for preparing the above-mentioned low-nickel-content atmospheric corrosion-resistant steel, comprising the following steps:

[0060] 1) Hot metal pretreatment

[0061] Pretreat the molten iron to ensure that the mass ratio of S in the molten iron is ≤0.003%, and the slag is removed before entering the converter;

[0062] 2) Converter smelting

[0063] Refined steel scrap and molten iron are used for smelting; the converter pulls carbon once and hits to avoid spot blowing; the tapping adopts ferrosilicon, high manganese, ferrochrome and nickel-copper alloy, and the ladle is purged with argon gas before tapping to control the tapping port to avoid Scatter flow, the mass content of Al in the ladle is 0.015-0.030%; the mass content of N in the ladle is ≤0.0030%;

[0064] 3) LF refining

[0065] The LF treatment process maintains a slight positive pressure, and the amount of N increase is ≤10ppm; LF uses activated lime and fluo...

Embodiment 1

[0080] Atmospheric corrosion-resistant steel with low nickel content is prepared according to the following mass percentages: C: 0.06-0.12%, Si: 0.20-0.50%, Mn: 0.30-0.50%, S: 0.001-0.005%, P: 0.07-0.12%, Cu: 0.20~0.60%, Al: 0.015~0.06%, Ni: 0.03~0.10%, Cr: 0.30~0.70%, Ca: 0.0010~0.0050%, N: 0.0010~0.0060%, and the rest are Fe and other unavoidable impurities.

[0081] The preparation method is as follows:

[0082] 1) Hot metal pretreatment

[0083] Pre-treat the molten iron to ensure that the quality of S in the molten iron is ≤0.003%, and the slag is removed before entering the converter;

[0084] 2) Converter smelting

[0085]Refined steel scrap and molten iron are used for smelting; the converter pulls carbon once and hits to avoid spot blowing; the tapping adopts ferrosilicon, high manganese, ferrochrome and nickel-copper alloy, and the ladle is purged with argon gas before tapping to control the tapping port to avoid Scatter flow, the mass content of Al in the ladle i...

Embodiment 2

[0095] Atmospheric corrosion-resistant steel with low nickel content is prepared according to the following mass percentages: C: 0.06-0.12%, Si: 0.20-0.50%, Mn: 0.30-0.50%, S: 0.001-0.005%, P: 0.07-0.12%, Cu: 0.20~0.60%, Al: 0.015~0.06%, Ni: 0.03~0.10%, Cr: 0.30~0.70%, Ca: 0.0010~0.0050%, N: 0.0010~0.0060%, and the rest are Fe and other unavoidable impurities.

[0096] The difference between the preparation method and Example 1 is:

[0097] In step 5), the temperature out of the furnace is 1220° C., and the heating time is 180 minutes;

[0098] In step 6), the final rolling temperature: 900°C; the coiling temperature: 550°C.

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Abstract

The invention discloses low-nickel-content atmospheric corrosion resistant steel and a preparation method thereof. The low-nickel-content atmospheric corrosion resistant steel is composed of C, Si, Mn, S, P, Cu, Al, Ni, Cr, Ca, N, Fe and other inevitable impurities; low-nickel elements are added to be compositely strengthened with other microalloy elements, and meanwhile through reasonable proportioning, the purpose of improving corrosion resistance of the steel can be achieved; and meanwhile, the low-nickel-content atmospheric corrosion resistant steel further has excellent forming performance, cold bending performance, welding performance and the like, and the cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of steel preparation, and in particular provides an atmospheric corrosion-resistant steel with low nickel content and a preparation method thereof. The steel is mainly used for manufacturing containers, railway vehicles, bridges, ships, automobiles, boilers, buildings and the like. Background technique [0002] Generally speaking, the corrosion of metals under natural environmental conditions is called atmospheric corrosion, so steels that can resist corrosion under atmospheric natural environmental conditions are called atmospheric corrosion-resistant steels. The so-called atmospheric corrosion-resistant steel means that it has better corrosion resistance than ordinary carbon steel in the atmosphere, and only needs a few percent of alloy elements (Cu, P, Cr, Ni, Mo, Nb, RE, etc. ) low-cost low-alloy steel. For example, because the container is exposed to the atmosphere for a long time, atmospheric corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C33/06C21D8/02
CPCC21D8/0226C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42Y02P10/20
Inventor 吴刚文小明韩宇徐勇王全洲陈红远崔宏涛
Owner BENGANG STEEL PLATES
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