Carbon steel and Carbon structural steel

Carbon steel, also called carbon steel, is an iron-carbon alloy with a carbon content (wc) of less than 2%. Carbon steel generally contains a small amount of silicon, manganese, sulfur, and phosphorus in addition to carbon.steel angle bar

According to the use, carbon steel can be divided into three types: carbon structural steel, carbon tool steel and free-cutting structural steel. Carbon structural steel can be divided into two types: building structural steel and machine-made structural steel.

Carbon  steel and Carbon structural steel

According to the carbon content, carbon steel can be divided into low carbon steel (wc ≤ 0.25%), medium carbon steel (wc 0.25% ~ 0.6%) and high carbon steel (wc > 0.6%). According to the phosphorus and sulfur content, carbon steel can be divided into ordinary carbon steel (high in phosphorus and sulfur), high-quality carbon steel (low in phosphorus and sulfur) and high-quality steel (low in phosphorus and sulfur).

Generally, the higher the carbon content in carbon steel, the higher the hardness and the higher the strength, but the plasticity is lowered.

Carbon structural steel:This kind of steel mainly guarantees the mechanical properties, so its grades reflect its mechanical properties, which are represented by Q+ numbers, where “Q” is the pinyin prefix of the yield point “Qu”, and the number indicates the yield point value. For example, Q275 indicates the yield point is 275 MPa. If the letters A, B, C, and D are marked after the grade, it means that the quality grade of the steel is different, and the amount of S and P is sequentially decreased, and the quality of the steel is sequentially increased. If the letter “F” is marked after the grade, it is boiling steel, the mark “b” is semi-killed steel, and the one without “F” or “b” is killed steel. For example, Q235-A·F represents a grade A boiling steel with a yield point of 235 MPa, and Q235-c represents a grade c killed steel with a yield point of 235 MPa.

Carbon structural steels are generally not heat treated and are used directly in the supply state. Generally, Q195, Q215, Q235 steel has low carbon mass fraction, good welding performance, good plasticity and toughness, and has certain strength. It is often rolled into thin plates, steel bars, welded steel pipes, etc., used for bridges, buildings and other structures and ordinary rivets. Screws, nuts and other parts. Q255 and Q275 steel have a slightly higher mass fraction, higher strength, better plasticity and toughness, and can be welded. Usually, steel, strip and steel plates are used as structural members, and simple mechanical connecting rods, gears and couplings are manufactured. Parts, pins and other parts.

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