TB/T 1979 is a standard for atmospheric corrosion-resistant steel for railway vehicles. It stipulates the dimensions and shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of atmospheric corrosion-resistant steel for railway vehicles. This standard applies to hot-rolled and cold-rolled steel plates, steel strips and sections for the manufacture of atmospheric corrosion-resistant steel for railway vehicles.
In the TB/T 1979 standard, the chemical compositions of atmospheric corrosion-resistant steel for railway vehicles of different materials are different. The following are the chemical composition ranges of some materials:
05CuPCrNi: The maximum C content is 0.09%, the Si content is 0.25%~0.50%, the Mn content is 0.20%~0.50%, the P content is 0.060%~0.12%, the maximum S content is 0.02%, and the Cr content is 0.25%~0.50 %, the Ni content is 0.30%~1.25%, and the Cu content is 0.12%~0.65%.
09CuPCrNi-A: The maximum C content is 0.12%, the Si content is 0.25%~0.75%, the Mn content is 0.20%~0.50%, the P content is 0.060%~0.12%, the maximum S content is 0.02%, and the Cr content is 0.25% ~0.50%, Ni content is 0.30%~1.25%, Cu content is 0.12%~0.65%.
09CuPCrNi-B: The maximum C content is 0.12%, the Si content is 0.10%~0.40%, the Mn content is 0.20%~0.50%, the P content is 0.060%~0.12%, the maximum S content is 0.02%, and the Cr content is 0.25% ~0.45%, Ni content is 0.30%~0.65%, Cu content is 0.25%~0.50%.
The proportion of these chemical components is crucial to the atmospheric corrosion resistance of steel, ensuring that the steel has good durability and stability in outdoor environments.
The production method of atmospheric corrosion-resistant steel for railway vehicles under the TB/T 1979 standard mainly involves key processes such as steelmaking, continuous casting and rolling. First of all, the steelmaking process ensures that the steel obtains the required chemical composition and basic mechanical properties by controlling the composition of raw materials and the smelting process. In the continuous casting process, the molten steel is continuously cast into billets through a continuous casting machine. In the rolling process, the steel billet is hot-rolled or cold-rolled and processed into steel plates, steel strips or steel sections that meet the standards.
Atmospheric corrosion-resistant steel for railway vehicles under the TB/T 1979 standard has several notable features:
1. Excellent atmospheric corrosion resistance: This is the most outstanding feature of TB/T 1979 steel. By adding specific alloy elements to steel and optimizing the smelting and rolling processes, steel can resist atmospheric corrosion and extend its service life in outdoor environments.
2. Good mechanical properties: TB/T 1979 steel not only has excellent corrosion resistance, but also has high strength and toughness, meeting the requirements for material strength and structural stability of railway vehicles.
3. Diversified product types: This standard covers a variety of product types such as hot-rolled and cold-rolled steel plates, steel strips, and shaped steel, providing a wealth of options for the manufacturing of railway vehicles.
4. Strict quality control: The TB/T 1979 standard has clear requirements for the chemical composition, mechanical properties, metallographic structure and corrosion resistance of steel, and strict quality control measures are adopted to ensure product quality.
5. Environmental protection: Due to its good corrosion resistance, TB/T 1979 steel can reduce reliance on anti-corrosion coatings during use, thereby reducing the impact on the environment during the coating process, and has a certain degree of environmental protection.
Specifically, TB/T 1979 steel can be used in the manufacturing and maintenance process of railway vehicles, such as the manufacturing of car bodies, frames, carriages and other parts. It is used to manufacture other railway equipment and components that have higher requirements on material performance, such as railway pidges, tunnel support structures, etc.
