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How is coldcurved steel distinguished from hot-rolled steel?

Source:Shandong Tianyi|Date: 2019-05-22| Hits


  Cold-formed steel:

  Cold-formed steel refers to a finished steel product of various cross-sectional shapes bent by a steel plate or a strip steel in a cold state. Cold-formed steel is an economical thin-section thin-walled steel, also known as steel-refrigerated curved or cold-formed profiles. Cold-formed steel is the main material for making lightweight steel structures. It has a variety of extremely thin, well-shaped and complex sections that cannot be produced by hot rolling. Compared with hot-rolled steel, the radius of gyration can be increased by 50-60% and the moment of inertia of the section can be increased by 0.5-3.0 times in the same cross-sectional area, so that the material strength can be used reasonably; That is to say, the steel structure made of the traditional I-beam, channel steel, angle steel and steel plate can save about 30 to 50% of the steel.

  The difference between cold-formed steel and welded steel pipe is mainly: welded steel pipe is mainly used to transport fluids such as gas and tap water. Oil, liquefied gas, steam, etc. The steel pipe is required to withstand a certain pressure, and the cold-formed steel is used for manufacturing the structure, and has certain requirements on the cross-section, shape, size and mechanical properties of the steel under external force.

  Cold-formed steel is one of many steel grades. A certain width of strip steel passes through a set of longitudinally arranged rolls under normal temperature conditions, and is gradually deformed to meet the shape and size required by the use, and then cut to a corresponding size. length. This product is a cold-formed steel. Of course, cold-formed steel can also be obtained by deformation methods such as stamping, bending or drawing. However, the roll forming method is suitable for large-scale industrial production, and its product quality, processing cost, and production efficiency are incomparable to other methods, and it is the main production process of the current cold-formed steel. If the unit is equipped with welding equipment (such as high-frequency welding, argon arc welding, etc.), it can also produce cold-formed steel with closed sections.

  Hot rolled steel:

  Hot-rolled steel is a steel of various geometric cross-sections rolled by heating steel billets. According to the different sections of the section steel, it can be divided into angle steel, flat steel, channel steel and I-beam and hot-rolled L-shaped steel. According to the shape of the section steel, it can be divided into three types: simple section, complex section or profiled section and periodic section:

  1 The characteristic of a simple section is that the tangential line at any point around the cross section is generally not intersected in the section, such as round steel, square steel, hexagonal steel, flat steel, triangular steel, bow steel and elliptical steel.

  The 2-period section is periodically changed in shape and size along the length of the steel, such as reinforced bars, axles, and plough steel.

  3 complex sections include angle steel, I-beam, channel steel, T-beam, H-beam, Z-beam, rail, steel sheet pile, window frame steel and other miscellaneous section steel;

  According to the size of the section of the section steel, it is divided into three types: large section steel, medium section steel and small section steel.

  China's hot-rolled steel for construction, currently mainly used ordinary carbon steel grade A steel (carbon content 0.14 ~ 0.22%), which is characterized by easy smelting, low cost, moderate strength, good plasticity and weldability, suitable Construction works.

  Most of the low-alloy steel hot-rolled steel is hot-rolled reinforced bar and section steel rolled by 16Mn, and the profiled section steel is used less. Compared with ordinary I-beam, H-shaped steel has the advantages of large section modulus, light weight, steel saving, and easy combination and connection with other components.

  In China, hot-rolled steel has become one of the most widely used materials in basic construction, such as reinforced steel, axles and plough steel, according to the size of section steel sections. Various types of hot-rolled steel are used in the machinery, chemical, shipbuilding, mining, petroleum and railway sectors. In construction engineering, hot-rolled steel is mainly used for industrial and civil houses, load-bearing skeletons of bridges (beams, columns, trusses, etc.), tower structures, high-voltage power line supports, etc.

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