The common carbon steel

1. Carbon structural steel

Grade: Example Q235-A·F, indicating σs ≥ 235MPa Grade note: Q is yield strength A quality grade (with ABCD four grades), F boiling steel Features: low price, excellent process performance (such as weldability and cold formability) . Application: general engineering structures and general mechanical parts. For example, Q235 can be used to make bolts, nuts, pins, hooks and less important mechanical parts, as well as screw steel, section steel, steel bars, etc. in building structures.

2. High quality carbon structural steel

Grades: Example 45, 65Mn, 08F Grade Notes: Directly represent the carbon content of the metal in ten thousand. Application: Non-alloy steels used to manufacture important mechanical parts are generally used after heat treatment. Commonly used steel grades and uses: 08F, low carbon mass fraction, good plasticity, low strength, used for stamping parts such as automobile and instrument shells; 20, good plasticity and weldability, used for parts and carburized parts that do not require high strength , such as machine covers, welding containers, small shafts, nuts, washers, and carburized gears, etc.; 45, 40Mn, after quenching and tempering, the comprehensive mechanical properties are good, and they are used for mechanical parts with large forces, such as gears, connecting rods, and machine tools. Main shaft, etc.; 60, 65Mn steel has high strength; used to manufacture various springs, motorcycle rims, and low-speed wheels.

3. carbon tool steel

Brand: For example, T12 steel means carbon tool steel with Wc=1.2%. Grade note: T plus the percentage of carbon content in the metal. Features: It belongs to eutectoid steel and hypereutectoid steel, with high strength and hardness and good wear resistance. It is suitable for manufacturing various low-speed cutting tools. Commonly used steel grades and uses: T7, T8: For making parts that withstand a certain impact and require toughness. Such as sledgehammers, punches, chisels, woodworking tools, scissors T9, T10, T11: Manufacturing tools that require high hardness and high wear resistance with low impact. Such as taps, small drills, dies, hand saw blades T12, T13: Make tools that are not impacted. Such as files, spatulas, razors, measuring tools

4. cast steel

Grade: For example, ZG200-400, which means cast steel with σs≥200MPa and σb≥400MPa. Performance: The casting performance is worse than cast iron, but the mechanical properties are better than cast iron; Application: It is mainly used to manufacture important mechanical parts with complex shapes, high mechanical performance requirements, and difficult to form by forging and other methods in the process, such as automobiles gearbox housings, couplers and couplings of rolling stock, etc.