阅读说明：本技术 低合金耐腐蚀钢 (Low alloy corrosion resistant steel ) 是由 赵小军 薛伟江 刘芳 于 2020-05-13 设计创作，主要内容包括：本发明提供了一种低合金耐腐蚀钢,涉及低合金钢制备领域,低合金耐腐蚀钢的化学成分的质量百分比为：C：0.09～0.25wt％、Cr：0.9～1.3wt％、Ni：0.2～2.0wt％、P：0.02～0.05wt％,并且其余部分为Fe和其它不可避免的杂质。该低合金耐腐蚀钢在钢的韧性和焊接性能方便比一般低合金耐腐蚀钢要高很多,从而满足了产品的使用性能,适合在大气环境下长期的工作,同时也克服了常规低合金耐腐蚀钢韧性和焊接性能差的问题,并且具有较长的寿命,其性价比高,适合工业制造领域的大面积推广应用。(The invention provides low-alloy corrosion-resistant steel, which relates to the field of low-alloy steel preparation, and comprises the following chemical components in percentage by mass: c: 0.09-0.25 wt%, Cr: 0.9 to 1.3 wt%, Ni: 0.2 to 2.0 wt%, P: 0.02 to 0.05 wt%, and the balance being Fe and other unavoidable impurities. The toughness and the welding performance of the low-alloy corrosion-resistant steel are much higher than those of common low-alloy corrosion-resistant steel, so that the low-alloy corrosion-resistant steel meets the service performance of products, is suitable for long-term work in an atmospheric environment, overcomes the problem that the toughness and the welding performance of the conventional low-alloy corrosion-resistant steel are poor, has a long service life, has high cost performance, and is suitable for large-area popularization and application in the field of industrial manufacturing.)

1. The low-alloy corrosion-resistant steel is characterized by comprising the following chemical components in percentage by mass: c: 0.09-0.25 wt%, Cr: 0.9 to 1.3 wt%, Ni: 0.2 to 2.0 wt%, P: 0.02 to 0.05 wt%, and the balance being Fe and other unavoidable impurities.

2. The low alloy corrosion-resistant steel according to claim 1, wherein the chemical composition of the low alloy corrosion-resistant steel is, in mass percent: c: 0.09 wt%, Cr: 0.9 wt%, Ni: 0.2 wt%, P: 0.02 wt%, and the balance being Fe and other unavoidable impurities.

3. The low alloy corrosion resistant steel according to claim 1, wherein the tensile strength of the low alloy corrosion resistant steel is greater than 550 MPa.

4. The low alloy corrosion-resistant steel according to claim 1, wherein the chemical composition of the low alloy corrosion-resistant steel is, in mass percent: c: 0.25 wt%, Cr: 1.3 wt%, Ni: 2.0 wt%, P: 0.05 wt%, and the balance of Fe and other unavoidable impurities.

5. The low alloy corrosion-resistant steel according to claim 1, wherein the chemical composition of the low alloy corrosion-resistant steel is, in mass percent: c: 0.2 wt%, Cr: 1.2 wt%, Ni: 0.2 wt%, P: 0.02 wt%, and the balance being Fe and other unavoidable impurities.

6. The low alloy corrosion-resistant steel according to claim 1, wherein the chemical composition of the low alloy corrosion-resistant steel is, in mass percent: c: 0.2 wt%, Cr: 1.2 wt%, Ni: 0.2 wt%, P: 0.05 wt%, and the balance of Fe and other unavoidable impurities.

Technical Field

The invention relates to the field of low alloy steel preparation, in particular to low alloy corrosion-resistant steel.

Background

The low-alloy corrosion-resistant steel is mainly characterized in that the corrosion resistance in different corrosion environments is obviously superior to that of carbon steel and other common low-alloy steels. But alloying elements are added to improve the corrosion resistance of the steel. The toughness and weldability tend to deteriorate while the strength of the steel is improved. This has created many difficulties in the development of low alloy corrosion resistant steels, and its development and application have been hindered, so that the development of low alloy corrosion resistant steels has been in the history for more than half a century, but has not yet formed a complete system and is still under development.

The steel type has no unified classification standard, and can be divided into low alloy steel with atmospheric corrosion resistance, low alloy steel with seawater corrosion resistance, low alloy steel with salt and halogen corrosion resistance, low alloy steel with sulfide stress corrosion resistance, low alloy steel with hydrogen corrosion resistance and low alloy steel with sulfuric acid dew point corrosion resistance according to the corrosion resistance characteristics and the application field of the steel.

Among them, the low alloy steel resistant to atmospheric corrosion is also called weathering steel. The research on atmospheric corrosion of steel products begins in the early 20 th century, and atmospheric corrosion tests are carried out under different atmospheric environmental conditions. The first proved is the anti-atmospheric corrosion effect of the copper element in the steel. Thereafter, the corresponding effect of phosphorus in the steel on corrosion resistance was further confirmed.

The low alloy steel with seawater corrosion resistance has corrosion resistance in seawater and marine environment. This steel belongs to an important class of marine steels. It features that its corrosion resistance in sea and ocean environment is obviously superior to that of carbon steel, ordinary low-alloy steel and ordinary steel for ocean, and it is mainly suitable for seaport facilities and ocean engineering facilities in shallow sea. Ocean engineering facilities are subjected to the impact of huge wind waves in addition to seawater corrosion. Therefore, the material is required to have better comprehensive mechanical properties, weldability and manufacturing process performance besides corrosion resistance. However, alloying elements added to improve the corrosion resistance of the material have conventionally deteriorated the toughness and weldability of the steel as well as the strength.

The low alloy steel with sulfide stress corrosion resistance has corrosion resistance in an environment containing sulfide medium. The corrosion failure of steel in a sulfide medium under tensile stress is mainly stress corrosion cracking. Carbon steel is susceptible to Stress Corrosion Cracking (SCC) in a medium containing hydrogen sulfide (H2 s).

Disclosure of Invention

The invention mainly aims at low-alloy corrosion-resistant steel used in atmosphere, aims at the characteristic of poor toughness and weldability of the corrosion-resistant steel in the prior art, and improves the toughness and weldability of the steel by improving the components in the low-alloy steel.

The present invention achieves the above-described object by the following technical means.

The low-alloy corrosion-resistant steel comprises the following chemical components in percentage by mass: c: 0.09-0.25 wt%, Cr: 0.9 to 1.3 wt%, Ni: 0.2 to 2.0 wt%, P: 0.02 to 0.05 wt%, and the balance being Fe and other unavoidable impurities.

Further, the low-alloy corrosion-resistant steel comprises the following chemical components in percentage by mass: c: 0.09 wt%, Cr: 0.9 wt%, Ni: 0.2 wt%, P: 0.02 wt%, and the balance being Fe and other unavoidable impurities.

Further, the tensile strength of the low alloy corrosion resistant steel is more than 550 MPa.

Further, the low-alloy corrosion-resistant steel comprises the following chemical components in percentage by mass: c: 0.25 wt%, Cr: 1.3 wt%, Ni: 2.0 wt%, P: 0.05 wt%, and the balance of Fe and other unavoidable impurities.

Further, the low-alloy corrosion-resistant steel comprises the following chemical components in percentage by mass: c: 0.2 wt%, Cr: 1.2 wt%, Ni: 0.2 wt%, P: 0.02 wt%, and the balance being Fe and other unavoidable impurities.

Further, the low-alloy corrosion-resistant steel comprises the following chemical components in percentage by mass: c: 0.2 wt%, Cr: 1.2 wt%, Ni: 0.2 wt%, P: 0.05 wt%, and the balance of Fe and other unavoidable impurities.

Has the advantages that:

the toughness and the welding performance of the low-alloy corrosion-resistant steel are much higher than those of common low-alloy corrosion-resistant steel, so that the low-alloy corrosion-resistant steel meets the service performance of products, is suitable for long-term work in an atmospheric environment, overcomes the problem that the toughness and the welding performance of conventional low-alloy corrosion-resistant steel are poor, has a long service life, has high cost performance, and is suitable for large-area popularization and application in the field of industrial manufacturing.

Detailed Description