1020 DOM Tubing Drawn Over Mandrel (DOM) Steel Round Tube For Mechanical
1020 DOM tubing is a cold-drawn, seamless steel tube produced by drawing a hot-finished tube over a mandrel, resulting in precise dimensions, smooth surface finish, and enhanced mechanical properties. Commonly manufactured from low-carbon grades such as AISI 1020, it offers excellent machinability, weldability, and uniform wall thickness, making it ideal for demanding mechanical applications. Key competing grades include AISI 1008, 1018, 1020, 1030, and 1045, each with distinct chemical and mechanical characteristics. DOM tubing typically conforms to standards such as ASTM A519/A513 (USA), EN 10305-1 (EU), GOST 8734-75 (Russia), JIS G3445 (Japan), and GB/T 4161 (China), and is widely used in automotive shafts, hydraulic cylinders, furniture components, and agricultural equipment.
Material
“Drawn Over Mandrel” (DOM) tubing is manufactured by cold drawing a seamless tube over a tight-fitting mandrel, which refines inner and outer diameters, improves surface finish, and enhances mechanical properties through work hardening . The base material is low-carbon steel, commonly AISI 1020, known for its ductility, weldability, and consistent grain structure .
Specifications
| Parameter |
Typical Range |
Source |
| Outside Diameter (OD) |
4 mm – 200 mm |
GOST 8734-75 tolerances |
| Wall Thickness (WT) |
1 mm – 20 mm |
GOST 8734-75 tolerances |
| Length |
3 m – 6 m |
Industry practice |
| Surface Finish |
Ra ≤ 1.6 µm |
ASTM A519 requirements |
| Straightness |
≤ 0.5% of length |
GOST 8734-75 requirements |
Chemical Composition
| Grade |
C (wt%) |
Mn (wt%) |
P (≤ wt%) |
S (≤ wt%) |
Other Highlights |
| AISI 1008 |
0.08–0.10 |
0.40–0.70 |
0.035 |
0.035 |
Si 0.15–0.30; minor Ni, Cr, Cu, Mo |
| AISI 1018 |
0.15–0.20 |
0.60–0.90 |
0.040 |
0.050 |
Fe balance |
| AISI 1020 |
0.17–0.23 |
0.30–0.60 |
0.040 |
0.050 |
Si ≤ 0.35; Cu ≤ 0.40; Ni ≤ 0.40 |
| AISI 1030 |
0.28–0.34 |
0.60–0.90 |
0.025 |
0.015 |
Si 0.15–0.35; trace Mo |
| AISI 1045 |
0.42–0.50 |
0.60–0.90 |
0.040 |
0.050 |
Fe balance |
Mechanical Performance
| Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (HB) |
| AISI 1008 |
340 |
285 |
20 |
95 |
| AISI 1018 |
440 |
370 |
15 |
126 |
| AISI 1020 |
395 |
295 |
36.5 |
111 |
| AISI 1030 |
650–880 |
350–550 |
8–25 |
– |
| AISI 1045 |
565 |
310 |
16 |
163 |
Main Characteristics
-
Dimensional Precision: Tight tolerances (< ± 0.13 mm on OD; ± 0.12 mm on WT) ensure interchangeability .
-
Enhanced Strength: Cold work increases yield and tensile strength versus hot-finished tubes .
-
Improved Surface: Smooth, machine-ready finish (Ra ≤ 1.6 µm) reduces post-machining labor .
-
Excellent Machinability & Weldability: Low-carbon steel matrix supports easy cutting and effective fusion welding .
-
Uniform Wall Thickness: Mandrel drawing achieves consistent wall thickness with minimal eccentricity .
Execution Standards
-
ASTM A519: Standard for seamless mechanical tubing, including DOM by cold drawing
-
ASTM A513: Standard for electric-resistance welded mechanical tubing
-
EN 10305-1: Cold drawn seamless steel tubes for pressure purposes, precision grade
-
GOST 8734-75: Cold-formed seamless steel pipes, defining OD, WT, and mass tolerances
-
JIS G3445: Cold drawn steel tubes for general mechanical and structural use
-
GB/T 4161: Cold drawn steel tubes for general engineering purposes (China)
Application Fields
General Field: Mechanical and structural engineering for movable components.
-
Automotive: Drive shafts, steering components, suspension parts where precision and fatigue strength are critical.
-
Hydraulics: Cylinder barrels and piston rods in hydraulic equipment requiring smooth bore and high straightness.
-
Furniture: Chair legs, railing spindles, connectors demanding aesthetic finish and uniformity.
-
Agriculture: Gear shafts, linkage rods, pick-up tubes where durability and machinability are essential.
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