Cold-drawn
/glossary/cold-drawnSeamless pipe pulled through dies at room temperature for tight tolerances and smooth finish.
In detail
Cold-drawn seamless pipe is produced by pulling a hot-pierced mother hollow through dies and over a mandrel at room temperature. The process tightens dimensional tolerances to ±0.1 mm or better, improves surface finish to Ra 1.6 μm or less, and increases tensile strength through work hardening. Cold drawing is essential for precision hydraulic tubes, instrumentation tubing, and applications requiring tight assembly tolerances. Grades like SA179 and DIN 2391 ST52 are commonly cold-drawn.
Where you'll meet this in procurement
You will meet Cold-drawn in manufacturing notes, surface-finish call-outs, and precision-tube RFQs. Confirm that Cold-drawn is required for the duty (tolerance, bore finish, or coating), and that the quote states the same process the inspector will verify on receipt.