Steel Tube Network News: Essential Knowledge on Steel Reinforcement Engineering
Seamless steel tubes are manufactured by punching steel ingots or solid billets and then undergoing hot rolling, cold rolling, or cold drawing processes. These tubes are commonly specified by their outer diameter and wall thickness, expressed in millimeters (e.g., OD x WT). Seamless steel tubes are generally categorized into two main types: hot-rolled and cold-rolled (also known as cold-drawn) tubes.
Hot-rolled seamless steel tubes are further divided into several classifications, including general-purpose pipes, low- and medium-pressure boiler tubes, high-pressure boiler tubes, alloy steel tubes, stainless steel tubes, petroleum cracking tubes, geological tubes, and more. On the other hand, cold-rolled seamless tubes also include similar categories such as general pipes, low and medium-pressure boiler tubes, high-pressure boiler tubes, alloy and stainless steel tubes, and petroleum cracking pipes. Additionally, they may feature carbon or alloy thin-walled pipes, as well as special-shaped steel tubes.
In terms of dimensions, hot-rolled seamless pipes typically have an outer diameter larger than 32 mm with wall thicknesses ranging from 2.5 mm to 75 mm. Cold-rolled seamless pipes can be as small as 6 mm in diameter, with wall thicknesses as thin as 0.25 mm. Thin-walled pipes may have diameters up to 5 mm with wall thicknesses less than 0.25 mm. Compared to hot-rolling, cold-rolling offers better dimensional accuracy and surface finish.
Commonly used materials for seamless steel tubes include high-quality carbon steels like 10, 20, 30, 35, and 45, as well as low-alloy structural steels such as 16Mn and 5MnV. Other materials like 40Cr, 30CrMnSi, 45Mn2, and 40MnB are also used, either in hot-rolled or cold-rolled forms. Pipes made from low-carbon steels like 10 and 20 are primarily used for fluid transportation systems, while those made from medium-carbon steels such as 45 and 40Cr are often employed in mechanical components, including parts for cars and tractors.
To ensure quality, standard seamless steel pipes undergo strength tests and flattening tests. Hot-rolled pipes are usually delivered in a hot-rolled condition or after heat treatment, while cold-rolled pipes are typically supplied in a heat-treated state.
This knowledge is essential for engineers and professionals involved in construction, manufacturing, and pipeline design. Understanding the properties, classifications, and applications of seamless steel tubes helps in selecting the right material for specific industrial needs.
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