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Carbon steel is an iron-carbon alloy with a carbon content of 0.5718% to 2.11%. Also called carbon steel. Generally contains a small amount of silicon, manganese, sulfur, phosphorus. Generally, the higher the carbon content in carbon steel, the greater the hardness and the higher the strength, but the lower the plasticity.
Carbon structural steel
Brand: Example Q235-A·F, which means σs=235MPa.
Brand notes: Q is the yield strength A quality grade (with ABCD grade 4), F boiling steel.
Features: low price and excellent process performance (such as weldability and cold formability).
Application: General engineering structure and general mechanical parts. For example, Q235 can produce bolts, nuts, pins, hooks and less important mechanical parts, as well as screw steel, section steel, steel bars in building structures.
High-quality carbon structural steel
Trademarks: Example 45, 65Mn, 08F.
Brand annotation: directly expresses the carbon content of the metal in tens of thousands.
Application: Non-alloy steels used to manufacture important mechanical parts are generally used after heat treatment.
Common steel grades and uses:
08F, low mass fraction of carbon, good plasticity, low strength, used for stamping parts such as automobile and instrument shell;
20, good plasticity and weldability, used for parts with low strength requirements and carburized parts, such as hoods, welded containers, small shafts, nuts, washers and carburized gears;
45, 40Mn, with good comprehensive mechanical properties after quenching and tempering, used for mechanical parts with greater stress, such as gears, connecting rods, machine tool spindles, etc.;
60, 65Mn steel has high strength; it is used to manufacture various springs, rims of locomotive wheels, and low-speed wheels.
Carbon tool steel
Brand: For example, T12 steel means carbon tool steel with Wc=1.2%.
Grade notes: T plus the metal carbon content in thousand.
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.
Common steel grades and uses:
T7, T8: Manufacture parts that require a certain impact and require toughness. Such as sledgehammer, punch, chisel, woodworking tools, scissors.
T9, T10, T11: Manufacture tools with low impact and high hardness and wear resistance. Such as taps, small drills, dies, and hand saw blades.
T12, T13: Make tools that are not impacted. Such as files, scrapers, razors, measuring tools.
Brand: For example, ZG200-400, means cast steel with σs=200MPa and σb=400MPa.
Performance: Casting performance is worse than cast iron, but mechanical properties are better than cast iron.
Application: It is mainly used to manufacture more important mechanical parts with complex shapes and high mechanical performance requirements, and it is difficult to form by forging and other methods in the process, such as automobile gearbox shells, couplers and couplings of rolling stock.
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