TAGS: corrosion | lowalloy | steel |
Chemical composition: The chemical composition of low alloy steel is one of the key factors affecting its corrosion resistance. Generally speaking, low-alloy steels containing elements such as chromium, nickel, and molybdenum have better corrosion resistance. In addition, other common alloying elements include manganese, silicon, phosphorus, copper, vanadium, etc. The content and types of these elements will also affect the chemical composition and properties of steel.
Alloying degree: The alloying degree of low alloy steel can be achieved by controlling the content of alloying elements. Generally speaking, the higher the degree of alloying, the less alloying elements it contains, but its grain refinement and phase transformation behavior will be enhanced, thereby improving its corrosion resistance. For example, the alloying degree of high-carbon low-alloy steel (C-N-Mn) is generally 0.5%~2.5%, the carbon content is between 0.3%~0.6%, and the manganese, phosphorus, and copper are relatively low.
Heat treatment process: The heat treatment process of low alloy steel can improve its structure and performance by normalizing and tempering, thereby improving its corrosion resistance. For example, normalizing can make the structure in the steel more uniform and improve its mechanical properties; while tempering can release the residual stress in the steel and improve the toughness and plasticity of the steel.
Processing method: High-strength plates are usually produced by rolling or forging processing methods, and these processing methods will also have a certain impact on the corrosion resistance of low-alloy steel. For example, rolling can form a layer of dense oxide skin on the surface of steel, thereby improving its corrosion resistance; while forging can improve the structure and grain size distribution of steel, further improving its mechanical properties and corrosion resistance.
The selection of suitable low-alloy steel materials requires comprehensive consideration of multiple parameters, including chemical composition, alloying degree, heat treatment process and processing method, etc. According to the specific use environment and requirements, different types and contents of alloying elements can be selected to manufacture low alloy steel materials to meet different corrosion resistance requirements.
16MnCr5MoV (carburized hardened structural steel):
Chemical composition: C≤0.22%, Si≤0.35%, Mn: 1.40-1.80%, P≤0.025%, S≤0.035%, Cr: 1.20-1.60%, Mo: 0.90-1.20%.
Alloying degree: Alloying degree is generally low carbon steel.
Heat treatment process: normalizing + tempering.
Processing method: rolling.
Main properties: high strength, high toughness, good welding performance and wear resistance.
Scope of application: suitable for manufacturing large mechanical parts, engineering machinery, auto parts, etc.
12Cr1MoV (quenched and tempered structural steel):
Chemical composition: C≤0.20%, Si≤0.35%, Mn: 1.20-1.60%, P≤0.025%, S≤0.035%, Cr: 1.20-1.60%, Mo: 0.90-1.20%.
Alloying degree: Alloying degree is generally low carbon steel.
Heat treatment process: normalizing + tempering.
Processing method: forging or rolling.
Main properties: high strength, high toughness, good welding performance and wear resistance.
Scope of application: suitable for manufacturing large mechanical parts, engineering machinery, auto parts, etc.
40Cr (quenched and tempered structural steel):
Chemical composition: C≤0.25%, Si≤0.35%, Mn: 1.40-1.80%, P≤0.025%, S≤0.035%, Cr: 1.40-1.80%, Mo: 0.75-1.25%.
Alloying degree: Alloying degree is generally medium carbon steel.
Heat treatment process: normalizing + tempering.
Processing method: forging or rolling.
Main properties: high strength, high toughness, good welding performance and wear resistance.
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