GB/T 3077 has clear regulations on the chemical composition of alloy structural steel. Specific chemical composition requirements will vary depending on the type of alloy structural steel. Taking 30CrMnSiA as an example, its chemical composition requirements are: carbon (C) content between 0.28~0.34%, silicon (Si) content between 0.90~1.20%, and manganese (Mn) content between 0.80~1.10% Among them, the allowable residual content of phosphorus (P) and sulfur (S) is both 0.025%, the content of chromium (Cr) is between 0.80~1.10%, and the allowable residual content of nickel (Ni) is 0.030%.
Generally speaking, the production methods of alloy structural steel may include the following: converter smelting, continuous casting, rolling, heat treatment,
Finishing.
The characteristics of GB/T 3077 "Alloy Structural Steel" are mainly reflected in the following aspects:
1. Diversity of chemical composition: Each type of steel has its specific chemical composition requirements. These chemical compositions are carefully designed and tuned to meet the performance requirements of steel in different application areas.
2. High strength and good toughness: Excellent performance in withstanding high stress and complex stress environments, making alloy structural steel widely used in manufacturing various important parts and structural parts.
3. Good processing performance: It has good processing performance, including cutting, welding, heat treatment, etc., allowing steel to be easily formed and processed during the production process, improving production efficiency.
4. Wide range of application fields: It is widely used in automobile, machinery, construction, chemical industry, electric power and other industries. Especially in high load, high stress or complex working environments, alloy structural steel plays an irreplaceable role.
5. Standardization and standardization: Provides unified and standardized guidance for the production and application of alloy structural steel.
GB/T 3077 "Alloy Structural Steel" has a wide range of applications, mainly reflected in the following aspects:
1. Widely used in manufacturing various mechanical parts and structural parts. It is often used to manufacture important carburized parts that require high surface hardness and good wear resistance, such as gears, camshaft connecting rods, crankshafts, etc.
2. Used to make nitrided parts with high wear resistance, high fatigue strength and considerable strength. These parts are processed with high precision, such as imitations, cylinder liners, gears, high-pressure valves, boring bars, worms, grinder spindles, etc.
