
| Property | Cold Rolled / Cold Finished | Hot Finished / Hot Rolled |
| Dimensional Tolerance | Extremely tight (typically 0.05 mm to 0.15 mm) | Broader (typically 0.5 mm or higher) |
| Surface Finish | Smooth, shiny, scale-free (Ra 0.41.6 m) | Rough, dark oxide mill scale |
| Mechanical Strength | Higher yield & tensile strength due to work hardening | Lower yield strength, higher ductility |
| Wall Thickness Uniformity | Superior wall concentricity | Standard eccentricity variation |
| Cost | Higher (requires extra processing steps & annealing) | Lower (direct hot extrusion/piercing) |
Cold Pilgering (Cold Rolling): A cold reduction method where multi-roll passes compress the pipe over a stationary tapered mandrel. Ideal for heavy wall reductions, high alloy steels (like AISI 4140, 4340, or stainless grades), and precise inner diameter (ID) control.
Cold Drawing (DOM / CDS): The pipe is pulled through a die and over an internal plug or mandrel. Used extensively for producing Drawn Over Mandrel (DOM) welded tubing and Cold Drawn Seamless (CDS) precision pipes.
Hydraulic & Pneumatic Cylinders: Requires honed internal surfaces and strict roundness.
Automotive & Aerospace: Drive shafts, steering columns, and high-strength structural tubing where weight-to-strength ratio is critical.
Precision Mechanical Components: Bushings, bearing sleeves, and machined tubular parts.
Common Standards:
ASTM A513 (Type 5 / Type 6): Electric-resistance-welded carbon and alloy steel tubing (DOM).
ASTM A519: Seamless carbon and alloy steel mechanical tubing.
EN 10305 (Parts 1 & 2): Steel tubes for precision applications (seamless cold drawn and welded cold drawn).
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