The Process of Hot Rolled Structure Tubes

Hot-rolled structural pipe with continuous casting slab or raw rolling slab as raw material, heated by step heating furnace, high pressure water descaling into the rough rolling mill. The rough rolling material is cut into the tail and tail, then into the finishing mill, and the computer controlled rolling is carried out. After the finish rolling through laminar cooling and coiling machine to take a straight hair volume. Straight hair volume of the head and tail are often tongue-shaped and fish-like, thickness, width accuracy is poor, the edge often exist wave shape, folding, tower and other defects. Its weight heavier, coil diameter 760mm. Will straight hair volume by cutting head, cut tail, trimming and multi-pass straightening, leveling and other finishing line treatment, and then cut or re-roll (the general pipe industry like to use). That is: hot-rolled steel, flat hot-rolled coil, longitudinal cutting and other products. Hot rolled finishing volume if the pickling to remove the scale and oil after the hot rolling pickling plate. The product has a local alternative to the trend of cold-rolled structural pipe, affordable, well received by the majority of users.

The Process of Cold Rolled Structure Pipe

Cold-drawn structural pipe with hot-rolled coil as raw material, pickling to remove the scale after the cold rolling, the finished product for the rolling hard roll. As a result of continuous cold deformation caused by cold hardening hard rolling strength, hardness, toughness index decreased, so the stamping performance will deteriorate, only for simple deformation of the parts. Rolling hard rolls can be used as raw materials for hot-dip galvanizing plants, since hot-dip galvanizing units are equipped with annealing lines. Rolling hard roll weight is generally 6 to 13.5 tons, coil diameter of 610mm.

General cold rolling plate, roll should be continuous annealing (CAPL unit) or hood furnace annealing to eliminate cold hardening and rolling stress, to meet the corresponding standard mechanical performance indicators.

The surface quality, appearance and dimensional accuracy of the cold-rolled structural pipe are better than those of the hot-rolled structural pipe, and the thickness of the product is about 0.18mm, so it is favored by the customers. To cold-rolled steel coil-based structure for the deep processing of products, a high value-added products. Such as electro-galvanized, hot-dip galvanized, fingerprint-resistant galvanized, color coated steel coil and vibration composite steel plate, PVC laminating steel plate, so that these products are beautiful, high corrosion resistance and other excellent quality, has been widely used. The cold rolled steel sheet must be finished after annealing, including cutting head, tail, trimming, leveling, leveling, rewinding, or slitting plate. Cold rolled products are widely used in automobile manufacturing, home appliances, instrument switches, construction, office furniture and other industries. The weight of each pack after the steel sheet is 3 to 5 tons. The flat weight is generally 3 to 10 tons / roll. Coil diameter 610mm.

Types of Structural Pipe

In general, structural pipe is a type of steel construction pipe that meets certain standards of chemical composition and mechanical properties. This pipe can be used for a wide variety of structural applications and there are variety of types of structural pipe available. Common types of structural pipe include:

  • Seamless Steel Pipe: Seamless steel structural pipe is a durable pipe product that is commonly used for dock piling, pipe piling, caissons, and bollards.
  • ERW Steel Pipe: This structural pipe is typically known to the construction industry as high quality line pipe and it is commonly used by the oil and utility companies. This steel pipe can be used for sign pole, column, dock, and tunnel construction.
  • Spiral Steel Pipe: This is an economical and durable type of structural pipe that offers long lasting durability for things like road casing, piling and trenches.
  • DSAW Carbon Steel Pipe: This structural pipe is welded on both the OD and the ID. It is available in many different grades and is used for road casing, road boring, culverts, and more.
  • Fence Pipe: This is a type of structural pipe that is becoming popular for building fences because of its high durability and strength. This structural pipe is used for enclosing parks, parking lots, and more.
  • Culvert Pipe: This type of pipe is not necessary a high quality or extremely durable structural pipe, but rather a construction pipe used for diverting water under and around driveways, water and sewer systems, drainage systems, and temporary bridges.

(This article comes from Crestwood Tubulars editor released)