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 “Quâ€, and the number indicates the yield point value. For example, Q275 indicates the yield point is 275MPa. 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 means the yield point is 235MPa. Class A boiling steel, Q235-c is 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. It is 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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