Production and Applications of Hot Formed Bends, and Processing of Stainless Steel Bends
Hot formed bends, also known as hot induction bends, are primarily categorized into two types: hot induction bends and cold induction bends. For hot induction bends, they fall under the scope of hot expansion during the production process.
Let's discuss the production of hot induction bends. After cutting the straight pipe, the induction coil is directly placed around the section of the steel pipe to be bent using a pipe bending machine. It's essential to note that the pipe head is clamped with a mechanical rotating arm, and the steel pipe is heated using medium-frequency electric current within the induction coil. When the steel pipe's temperature reaches the plastic state, a mechanical thrust at the rear end of the pipe is used to push and bend the steel pipe, and it's rapidly cooled with a cooling agent. This process involves heating, pushing, bending, and cooling while continuously forming the bent pipe. Hot induction bends are primarily used in the construction of curved steel structures.
On the other hand, the production of cold induction bends involves bending processes at room temperature without changing the material's structural organization.
In various piping systems, various types of bends are inevitably used, including common applications in ship pipelines and automotive fuel pipelines. Among different types of bends, circular bends offer distinct advantages. First, materials flow more stably in circular bends due to their smaller and more uniform wall impact forces.
In the processing and manufacturing of stainless steel bends, it's crucial to start by welding a polygonal multisided casing or a two-end sealed multisided fan-shaped casing with a cross-sectional polygon. For the end, a groove will be formed, which must be considered when processing other components. Additionally, most bend manufacturers should pay significant attention to weighing and inspection. Bends and elbows should maintain the pipe's original cross-section to prevent bend failure.
We should also consider the bend's service life diagram, which directly describes its service life. The service life of bends can be determined under different motor speeds by continuously pumping water at different motor speeds at various Celsius temperatures and bar pressures. However, for the current situation, it's important to focus on bend manufacturers who propose yield accuracy, as they cannot fully describe the anisotropy of aluminum alloys. This can significantly limit a company's production efficiency.
Regarding bend production, it relies largely on medium-frequency induction current. On the other hand, bends' formation largely starts from the left end to avoid pressure marks on the flange cover. Even low-pressure pipelines should consider using wire-connected flanges.
It's essential to note that bend convexity has a significant impact. For U-shaped bends, only mechanical processing methods can successfully complete steel grade and width, allowing for more ideal fittings.
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