Pure iron and carbon steel in air or oxygen (the effect of lead on carbon steel)

1. Carbon steel is an iron-carbon alloy with a carbon content of 0.0218%~2.11%. Also called carbon steel. Generally also contain 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 steel classification: 1) Carbon structural steel (Q235), which is cheap and has excellent process properties (such as weldability and cold formability). For general engineering structures and general mechanical parts. 2) High-quality carbon structural steel (45, 65Mn, 08F), non-alloy steel for manufacturing important mechanical parts, generally used after heat treatment. 3) Carbon tool steel (T12 steel), which belongs to eutectoid steel and hypereutectoid steel, has high strength, hardness and good wear resistance, and is suitable for manufacturing various low-speed cutting tools. 2. Stainless steel There are more than one hundred kinds of industrial stainless steel, and each developed stainless steel has good performance in its specific application field. The carbon content is low, the maximum does not exceed 1.2%, and the main alloying element is chromium (10.5%). 3. Q345 low-alloy steel, with a carbon content of less than 0.2% and a small manganese content

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