A kind of high chromium corrosion-resistant steel and its preparation method and application

A corrosion-resistant steel and high-chromium technology, applied in the field of high-chromium corrosion-resistant steel and its preparation, can solve the problems of high price, difficulty in popularizing construction steel, and increased cost.

Active Publication Date: 2021-05-25
SHOUGANG CORPORATION
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Problems solved by technology

With the different uses of steel, the corrosion degree and durability of ordinary steel show obvious disadvantages: First, the use of ordinary construction steel in coastal areas, marine engineering, marsh engineering and other natural environments with very harsh environmental conditions has already It cannot meet the requirements of its service life; second, the current domestic construction materials are all made of sea sand, which is rich in a large amount of chloride ions, and the long-term erosion of the steel matrix in the concrete can greatly reduce the service life of the steel; third , even if the addition of Cu and Ni alloys can play a role in delaying corrosion, but its price is relatively expensive, the cost is greatly increased, and it is difficult to promote it in the field of construction steel

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  • A kind of high chromium corrosion-resistant steel and its preparation method and application
  • A kind of high chromium corrosion-resistant steel and its preparation method and application
  • A kind of high chromium corrosion-resistant steel and its preparation method and application

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preparation example Construction

[0032] The embodiment of the present invention also provides a method for preparing high-chromium corrosion-resistant steel, which is used to prepare the above-mentioned high-chromium corrosion-resistant steel. The method includes:

[0033] The molten steel is adjusted according to the chemical composition of the mass fraction, and the adjusted molten steel is subjected to smelting, refining, continuous casting, billet heating, rough rolling, finish rolling and cooling to obtain high chromium corrosion-resistant steel.

[0034] Specifically, in the continuous casting, full-protection casting is adopted, and the inclusion control level is ≤1.5.

[0035] Specifically, during the heating of the slab, the heating temperature is 1185-1215°C.

[0036] Specifically, in the rough rolling, the rolling start temperature is 1035-1065°C.

[0037] Specifically, in the finish rolling, the finish rolling temperature is 845-875°C.

[0038] Specifically, in the cooling, the temperature is co...

Embodiment 1

[0044] The high-chromium corrosion-resistant steel provided in this embodiment includes the chemical composition of the following mass fractions:

[0045] C: 0.04%, Si: 0.66%, Mn: 0.66%, P: 0.009%, S: 0.003%, Cr: 7.45%, N: 0.0056%, and the rest are Fe and unavoidable impurities.

[0046] The present embodiment also provides the preparation method of the high-chromium corrosion-resistant steel, including:

[0047] Blending molten steel according to the chemical composition of the mass fraction, smelting, refining, continuous casting, casting slab heating, rough rolling, finish rolling and cooling the blended molten steel to obtain high chromium corrosion-resistant steel;

[0048] In continuous casting, full protection pouring is adopted, and the inclusion control level is ≤1.5;

[0049] During billet heating, the heating temperature is 1190°C;

[0050] During rough rolling, the rolling start temperature is 1040°C;

[0051]During finish rolling, the finish rolling temperature...

Embodiment 2

[0054] The high-chromium corrosion-resistant steel provided in this embodiment includes the chemical composition of the following mass fractions:

[0055] C: 0.03%, Si: 0.5%, Mn: 0.5%, P: 0.005%, S: 0.002%, Cr: 6.5%, N: 0.0040%, and the rest are Fe and unavoidable impurities.

[0056] The present embodiment also provides the preparation method of the high-chromium corrosion-resistant steel, including:

[0057] Blending molten steel according to the chemical composition of the mass fraction, smelting, refining, continuous casting, casting slab heating, rough rolling, finish rolling and cooling the blended molten steel to obtain high chromium corrosion-resistant steel;

[0058] In continuous casting, full protection pouring is adopted, and the inclusion control level is ≤1.5;

[0059] During billet heating, the heating temperature is 1185°C;

[0060] During rough rolling, the rolling start temperature is 1035°C;

[0061] During finish rolling, the finish rolling temperature i...

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Abstract

The invention relates to a high-chromium corrosion-resistant steel and its preparation method and application, and belongs to the technical field of corrosion-resistant steel. The high-chromium corrosion-resistant steel provided by the invention includes the following chemical components in mass fractions: C: 0.03-0.05%, Si : 0.5‑0.7%, Mn: 0.5‑0.7%, P: ≤0.02%, S: ≤0.01%, Cr: 6.5‑8.0%, N: 0.0040‑0.01%, and the rest are Fe and unavoidable impurities. The high chromium corrosion-resistant steel provided by the invention does not need to add expensive alloys, and has excellent corrosion performance, such as buildings and bridges with high strength and high plasticity and toughness. When chromium corrosion-resistant steel is tested for corrosion resistance, it is corroded in 1.5-2.5% NaCl alkaline solution for 70-74 hours by a periodic immersion tester. The experimental temperature is 40-50°C and the humidity is 65-75%.

Description

technical field [0001] The invention belongs to the technical field of corrosion-resistant steel, and in particular relates to a high-chromium corrosion-resistant steel and its preparation method and application. Background technique [0002] In recent years, with the development of the domestic economy and the improvement of people's requirements for the durability of buildings, major domestic steel mills and scientific research institutes have stepped up efforts to develop and promote corrosion-resistant steel products. There are steels resistant to industrial atmospheric corrosion and steels resistant to chloride ion corrosion. The former is used in the industrial atmospheric corrosion environment, adding a certain amount of Cu-P series or Cu-P-Cr series alloy can meet the corrosion resistance requirements, while the steel for chloride ion corrosion resistance is different, because the chloride ion penetrates the corrosion layer It has a strong ability to corrode the ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/02C22C38/04
CPCC22C38/001C22C38/02C22C38/04C22C38/18
Inventor 周玉丽晁月林邸全康王勇周洁刘洋洋王全礼程四华徐兵伟
Owner SHOUGANG CORPORATION
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