Steel grades with the air conditioner motor bearing 'C' indicate that their carbon content is higher than that of general steel grades without a 'C'. ②The product name, purpose, smelting and pouring method, etc. In addition to a wide variety of special steels, the specifications also show different characteristics from ordinary steels. Steel grades are referred to as steel grades, which are the names of each specific steel product and are a common language for people to understand steel. ③ Alloying elements such as vanadium V, titanium Ti, aluminum AL, boron B, and rare earth RE in steel are all microalloying elements. Low-alloy high-strength steel ① The steel number is basically the same as that of alloy structural steel. Free-cutting steel ①

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　(7) Chromium; can improve the hardenability and wear resistance of steel, and can improve the corrosion resistance and oxidation resistance of steel.001-0. But from another perspective, low carbon steel contains high sulfur and phosphorus, which can make it easy to cut, which is beneficial to improve the machinability of steel. (9) Molybdenum; can significantly improve the hardenability and thermal strength of steel, prevent temper brittleness, and improve remanence and coercivity. In high-quality steel, sulfur and phosphorus must be strictly controlled.005%) of boron, the hardenability of the steel can be doubled

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