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Two welded tube mill lines side by side in a white-walled workshop

Before a line is specified, four things usually need settling: which standards the mill has to satisfy, how the process runs from coil to finished pipe, how the line types compare, and what drives output, yield and wear once the line is running.

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Standards and Specifications

What each standard requires of the mill and its inspection chain, explained against the line that has to meet it.

H-beam production line running from the uncoiler down the length of the workshopH Beam Welding Line GOSTReading the Russian welded H-beam standard: the beam sizes and steel grades it covers, and how the H-beam line is configured to satisfy it.Read the guide →Forming section of a spiral welded pipe mill with the steel coil behindGB/T 9711 for Spiral Welded Line PipeWhat the standard asks of a spiral welded line: grades and dimensions, and the X-ray, hydrostatic and ultrasonic tests that close the inspection chain.Read the guide →
API SPEC 5L Inspection ChainHow an API line pipe mill extends a welded line with annealing, NDT and hydrostatic testing to satisfy API 5L.

How the Process Works

From coil entry to finished pipe — forming, high-frequency welding, sizing and cut-off, explained in the order the steel passes through them.

Welded Pipe GuideThe full process, comparison and selection guide for pipe buyers and plant ownersWelded Pipe Manufacturing ProcessThe whole tube mill stage by stage, from uncoiling and accumulation to high-frequency welding, sizing and cut-off.What Is ERW PipeDefinition, grades and the typical uses that decide how a mill is specifiedWhat Is the Roll Forming ProcessHow driven rolls bend strip a little further at every pass, on lines that close the profile into a tube and on lines that leave it open.How the Weld Seam HeatsSkin effect and proximity effect, and why HF welding needs no filler metalWhat Is an ERW Tube MillEquipment list of a high-frequency welded pipe line, section by sectionLine Videos23 production lines filmed running, plus a company film.

Choosing Between Line Types

The comparisons that decide the quotation: which route suits your diameter range, your tonnage and your order pattern.

SSAW or HFWWhere the Φ219–630 mm overlap sits, and how target diameter and end use decide between the two routes.Seamless vs Welded PipeCost, standards and when each one is actually specifiedSlitting vs Cut-to-LengthWhich coil processing line you actually need: slit coil or cut sheet.Direct Forming vs Round-to-SquareTwo routes to square section, compared on roll cost and size-change timeConfiguration TiersWhat changes between tiers — scope, automation level and inspection train — and what keeps the cost down after purchase.Tube Mill for SaleNew lines from the manufacturer, and what to check before ordering one.

Output, Yield, Cost and Wear

The running numbers: how much finished pipe a shift actually produces, how much of it is scrapped, and which parts get replaced and how often.

Output, Yield and Roll-Change CostWhat a shift really produces once size changes and scrap are countedSlitting Running CostKnife life, knife change time, tooling cost per tonne and shift output on a coil slitting line.Cut-to-Length AccuracyHow to read a length tolerance figure against real shift outputWhat Wears and What Gets ReplacedConsumables and wear parts line by line — rolls, saw blades, welder parts — and which spares ship with the line.Slitting PrecisionThe four slitting tolerances, including width, camber and burr, and how each one is caused.Supply Scope and AcceptanceWhat is in the scope, what is commissioned on site, and what the acceptance test measures

Terminology

Short definitions of the process terms used across these guides, from forming angle and roll forming to slitting camber.

Tube & Pipe Mill GlossaryForming angle, roll forming, skin effect, pressure welding, sizing and slitting tolerances, defined for each type of line.

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From the Workshop

Tube mill line from the entry endTube mill forming and sizing stands down a green workshop aisleWelded tube mill line in the workshop

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