DOM Carbon Steel Tube for Precision Machinery 30-425mm OD
Dom Round Tubing Welded Carbon Round Steel Tube for Precision Machinery
Material Overview
Dom Round Tubing—commonly referred to as DOM (Drawn Over Mandrel)—is produced from electric-resistance-welded (ERW) steel (typically AISI 1020, 1026, or equivalent). It undergoes cold drawing over a mandrel to remove weld flash, enhancing dimensional accuracy, concentricity, strength, and surface quality. It is widely used in precision machinery due to these enhanced characteristics.
Specifications
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Standards: Conforms to ASTM A513 Type 5 (mechanical tubing), as well as international equivalents like EN DIN EN 10250‑2 (C22E), GOST 10704‑91, JIS G3445 STKM 13B, and GB/T 31315‑2014.
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Typical Grades: AISI 1020 is most common; 1026 is used for larger ODs or thicker walls. Some sources also list ST52.3.
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Size Range: OD from ~0.188″ to 12″ (4.8 mm–127 mm); wall thickness from 0.028″ to 0.625″ (0.7 mm–15.9 mm).
Chemical Composition Comparison
Here's a table comparing chemical composition among five common low‑carbon steel grades used in DOM/precision tubing:
| Grade | C (%) | Mn (%) | P (max %) | S (max %) |
|---|---|---|---|---|
| AISI 1008 | 0.08–0.10 | 0.30–0.50 | 0.040 | 0.050 |
| AISI 1010 | 0.08–0.13 | 0.30–0.60 | 0.040 | 0.050 |
| AISI 1015 | 0.13–0.18 | 0.30–0.60 | 0.040 | 0.050 |
| AISI 1018 | 0.15–0.20 | 0.60–0.90 | 0.040 | 0.050 |
| AISI 1020 | 0.18–0.23 | 0.30–0.60 | 0.040 | 0.050 |
Mechanical Properties Comparison
Mechanical properties for the same five grades are outlined below:
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| AISI 1008 | ~340 | ~285 | ~20 | ~95 |
| AISI 1010 | ~365 | ~305 | ~20 | ~105 |
| AISI 1015 | ~385 | ~325 | ~18 | ~111 |
| AISI 1018 | ~440 | ~370 | ~15 | ~126 |
| AISI 1020 | ~420 | ~350 | ~15 | ~121 |
Key Features
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Tight Dimensional Tolerances: Cold drawing yields excellent OD/ID accuracy and concentricity
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Surface Finish: Smooth, flash-free internal and external surfaces
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Enhanced Mechanical Performance: Improved tensile/yield strength from cold worked processing; still offers great machinability and weldability, especially in 1020
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Cost-Efficient: Offers high performance at lower cost relative to seamless options
International Standard Equivalents
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EN: DIN EN 10250‑2 (C22E)
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GOST: GOST 10704‑91
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JIS: JIS G3445 STKM 13B
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GB: GB/T 31315‑2014 (cold‑drawn/rolled precision welded tubes)
Application Fields
DOM tubing is favored in precision-sensitive mechanical applications. Typical usage includes:
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Hydraulic Systems: Cylinder barrels, piston rods
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Automotive: Axles, gears, bushings, steering components
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Industrial Machinery: Shafts, spindles, couplings, structural supports
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Agricultural Equipment: Drive shafts, rollers, frame members
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Consumer & Construction: Furniture frames, accurate support members
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