Tianjin hot rolled steel pipe
Cold rolled steel pipe is one common type of steel pipe in the current steel pipe market. Cold rolled steel is essentially the hot rolled steel that has had further processing. Hot rolling is a mill process which involves rolling the steel at a high temperature (typically at a temperature over 1700° F), which is above the steel’s recrystallization temperature. Tianjin hot rolled steel pipe is typically cheaper than cold rolled steel due to the fact that it is often manufactured without any delays in the process, and therefore the reheating of the steel is not required (as it is with cold rolled). When the steel cools off it will shrink slightly thus giving less control on the size and shape of the finished product when compared to cold rolled. Generally speaking, hot rolled steel pipe is widely used in applications where precise shapes and tolerances are not required.
Generally speaking, almost all the cold products provide a superior surface finish, and are superior in tolerance, concentricity, and straightness when compared to hot rolled one. However, the steel pipe price is relatively high in comparison with hot rolled steel pipe due to its high costs of manufacturing. Furthermore, the cold rolled process creates a finished product that is more precise dimensionally than a hot rolled product. This is because it is already closer to the finished dimension since it has already gone through the cooling process. As an old saying goes, every thing has two edges. Specifically speaking, cold rolled steel is limited to just a few shapes, such as round steel pipe, square steel pipe, flat and variations of those types of shapes. And larger sized materials that need to be in more distinct shapes should be created with the hot rolled steel process.
In the steel pipe market, hot dipped galvanized steel pipe is often considered as the top choice for scaffolding pipe in structural applications because of its good anti-corrosion in service over time. With the layer of protection, pipes can be used in outdoor areas, and can withstand the harm from some of the environmental effects. Unlike other structural steel materials, galvanized steel is immediately ready for use when it is delivered. No additional preparation of the surface is required, no time-consuming inspections, additional painting or coatings are needed. Once the structure is assembled, contractors can immediately begin the next stage of construction without having to worry about the galvanized steel materials.
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