Cangzhou Zhongtuo Roll Forming Machinery Co., Ltd.+86 13166567923steven@zt-rfm.com
Category

Steel Pipe Machinery

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Steel pipe machinery for a complete welded tube line: coil handling, roll forming, high-frequency welding, sizing, straightening, cut-off and run-out, plus the end forming and coil processing equipment around it. Machines are grouped here by process and by the tube diameter and wall they are built for — from 10 mm light-wall tube to 168 mm structural pipe.

Datasheets for this group

How a welded tube line is put together

A tube line is five decisions, not one. Coil handling comes first: how heavy the coil is, how long a coil change takes, and whether strip is accumulated so the mill keeps running while a new coil is welded on. Then the forming and welding section, which sets the diameter and wall the line can make. Then sizing and straightening, which decide whether the tube is round enough to sell. Then the cut-off, which sets the cycle at short lengths. Then run-out and bundling.

Buyers often spend all their budget on the forming section and discover the binding constraint elsewhere — a saw that returns too slowly for short cut lengths, or a decoiler that needs a crane for every coil. Those two cost less than the mill and are much cheaper to specify up front than to change later.

Start from the tube you sell, not from the machine

The forming section is built for a diameter band and a wall range; asking it to run outside that band is a roll-load question, not a setting. So the specification should start with the finished tube: outside diameter, wall, round or square or rectangular, cut length, and how many tonnes a month. Everything else follows from those numbers.

Where a product range straddles two machines, the usual answer is the wider machine run slower on small sizes — unless the small sizes are high volume, in which case two lines are cheaper in the long run. A drawing or a section list is the fastest way to an accurate quotation; a model number alone is not.

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