NEWS CENTER
What is DOM tubing?
Specifically designed for use in mechanical machinery and buildings, mechanical tubing is a type of steel pipe. It has excellent mechanical qualities and strength, and it is commonly used to manufacture mechanical parts and construct mechanical structures. Mechanical tubings are classified into many varieties based on their manufacturing technique. DOM tubing is one of such. It is a high-end type of mechanical steel pipe that is ideal for applications requiring extreme dimensional accuracy and mechanical performance.
What is DOM tubing?
DOM is an abbreviation for Drawn Over Mandrel. As the name implies, DOM tubing is processed via a succession of drawing procedures to eliminate the internal weld and generate a smooth inner surface, resulting in a reduced diameter and improved precision. This technique improves the steel pipes strength and hardness while also improving its surface quality and dimensional correctness.
Process of Drawn Over Mandrel Tubing
Raw material: ERW steel pipes
↓
Surface treatment: cleaning and deburring
↓
Cold drawing: a mandrel is put within the tube to assure the dimensional precision of the inner diameter and to eliminate the influence of the weld.
↓
Annealing treatment: eliminate the internal stress during the cold drawing process and improve the mechanical properties of the material
↓
Straightening + cutting
↓
Dimension and performance testing
Performance of DOM Steel Tubing
⚑ Inner diameter accuracy: High
⚑ Inner and outer surfaces: Smooth
⚑ Strength: High, can withstand greater pressure and impact
⚑ Dimensional tolerance: Small
Electric-Resistance-Welded carbon steel tubing (DOM type)
✔ Standard: A513 type 5
✔ Material&Grade: Carbon steel; 1020 & 1026 steel
✔ Tubing shape: Round
Chemical Composition of 1020 and 1026 Steel DOM Tubing
|
Steel Grade |
C |
Mn |
P |
S |
|
1020 |
0.18-0.23 |
0.30-0.60 |
≤0.035 |
≤0.035 |
|
1026 |
0.22-0.28 |
0.60-0.90 |
≤0.035 |
≤0.035 |
DOM Tubing Sizes
★ Size range:
OD: 10mm-120mm
WT: 1.2mm-20mm
Length: Random & Fixed
DOM Tubing Size
★ Common Sizes (mm)
The table below shows the most common diameters of our DOM tubing. You can choose the outside diameter and wall thickness that best suit your needs. We may also customize DOM steel tube to meet specific customer needs.
|
|
WT |
|||||||||||||||||
|
OD |
1.2 |
1.3 |
1.4 |
1.5 |
1.6 |
1.8 |
2 |
2.1 |
2.3 |
2.5 |
2.6 |
2.8 |
3 |
3.2 |
3.3 |
3.5 |
3.6 |
8.6 |
|
16 |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
18 |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
23 |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
|
|
|
|
|
|
25 |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
|
|
|
|
|
27.4 |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
|
|
|
|
32.4 |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
|
|
|
37.4 |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
|
|
43 |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
|
45 |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
|
50.8 |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
54 |
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
56 |
|
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
|
60 |
|
|
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
|
63.5 |
|
|
|
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
65 |
|
|
|
|
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
|
68 |
|
|
|
|
|
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
|
|
70 |
|
|
|
|
|
|
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
73 |
|
|
|
|
|
|
|
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
|
75 |
|
|
|
|
|
|
|
|
|
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
√ |
★ OD&ID Tolerance
|
OD Range |
Tolerance |
||||
|
Outside Diameter |
Inside Diameter |
||||
|
in. |
mm |
in. |
mm |
in. |
mm |
|
0.394-0.499 |
10-12.67 |
+0.004/-0 |
+0.1/-0 |
- |
- |
|
0.500-1.699 |
12.7-43.15 |
+0.005/-0 |
+0.13/-0 |
+0/-0.005 |
+0/-0.13 |
|
1.700-2.099 |
43.18-53.31 |
+0.006/-0 |
+0.15/-0 |
+0/-0.006 |
+0/-0.15 |
|
2.100-2.499 |
53.34-63.47 |
+0.007/-0 |
+0.18/-0 |
+0/-0.007 |
+0/-0.18 |
|
2.500-2.899 |
63.5-73.63 |
+0.008/-0 |
+0.2/-0 |
+0/-0.008 |
+0/-0.2 |
|
2.900-3.299 |
73.66-83.79 |
+0.009/-0 |
+0.23/-0 |
+0/-0.009 |
+0/-0.23 |
|
3.300-3.699 |
83.82-93.95 |
+0.010/-0 |
+0.25/-0 |
+0/-0.010 |
+0/-0.25 |
|
3.700-4.099 |
93.98-104.11 |
+0.011/-0 |
+0.28/-0 |
+0/-0.011 |
+0/-0.28 |
|
4.100-4.499 |
104.14-114.27 |
+0.012/-0 |
+0.3/-0 |
+0/-0.012 |
+0/-0.3 |
|
4.500-4.899 |
114.30-124.43 |
+0.013/-0 |
+0.33/-0 |
+0/-0.013 |
+0/-0.33 |
★ Wall Thickness Tolerance
|
Wall Thickness (mm) |
OD Size (mm) |
|||
|
10≤OD≤20 |
20<OD≤50 |
50<OD≤100 |
100<OD≤120 |
|
|
1.24 |
+0.05/-0.05 |
+0.05/-0.08 |
+0.05/-0.08 |
- |
|
1.65 |
+0.05/-0.05 |
+0.05/-0.08 |
+0.05/-0.08 |
+0.1/-0.1 |
|
2.11 |
+0.05/-0.05 |
+0.05/-0.08 |
+0.08/-0.08 |
+0.1/-0.13 |
|
2.41 |
+0.05/-0.05 |
+0.05/-0.08 |
+0.08/-0.08 |
+0.1/-0.13 |
|
2.77 |
+0.05/-0.08 |
+0.05/-0.1 |
+0.08/-0.08 |
+0.13/-0.13 |
|
3.05 |
+0.08/-0.08 |
+0.05/-0.1 |
+0.08/-0.08 |
+0.13/-0.13 |
|
3.4 |
- |
+0.05/-0.1 |
+0.08/-0.08 |
+0.13/-0.13 |
|
3.76 |
- |
+0.05/-0.1 |
+0.08/-0.08 |
+0.13/-0.13 |
|
4.19 |
- |
+0.08/-0.1 |
+0.08/-0.1 |
+0.13/-0.15 |
|
4.57 |
- |
+0.1/-0.1 |
+0.08/-0.13 |
+0.15/-0.15 |
|
5.16 |
- |
+0.1/-0.13 |
+0.1/-0.13 |
+0.15/-0.18 |
|
5.59 |
- |
+0.1/-0.15 |
+0.1/-0.15 |
+0.18/-0.18 |
|
6.05 |
- |
+0.13/-0.15 |
+0.13/-0.15 |
+0.18/-0.18 |
|
6.58 |
- |
+0.13/-0.15 |
+0.13/-0.13 |
+0.18/-0.18 |
|
7.21 |
- |
+0.13/-0.15 |
+0.13/-0.15 |
+0.18/-0.18 |
|
7.62 |
- |
+0.15/-0.15 |
+0.15/-0.15 |
+0.2/-0.2 |
|
8.13 |
- |
+0.18/-0.18 |
+0.18/-0.18 |
+0.2/-0.2 |
|
8.74 |
- |
+0.2/-0.2 |
+0.2/-0.2 |
+0.23/-0.23 |
|
9.53 |
- |
- |
+0.23/-0.23 |
+0.23/-0.23 |
|
10.16 |
- |
- |
+0.25/-0.25 |
+0.25/-0.25 |
|
11.13 |
- |
- |
+0.28/-0.28 |
+0.28/-0.28 |
|
11.68 |
- |
- |
+0.3/-0.3 |
+0.3/-0.3 |
|
12.19 |
- |
- |
+0.3/-0.3 |
+0.3/-0.3 |
|
13.49 |
- |
- |
+0.33/-0.33 |
+0.33/-0.33 |
|
14.3 |
- |
- |
+0.33/-0.33 |
+0.33/-0.33 |
|
14.73 |
- |
- |
+0.36/-0.36 |
+0.36/-0.36 |
|
15.24 |
- |
- |
+0.38/-0.38 |
+0.38/-0.38 |
|
15.88 |
- |
- |
+0.41/-0.41 |
+0.41/-0.016 |
|
16.51 |
- |
- |
+0.43/-0.43 |
+0.43/-0.43 |
Applications of DOM Tubing
✔ Automotive industry: precision parts for drive shafts, shock absorbers, and suspension systems
✔ Hydraulic and pneumatic systems
✔ Precision components for mechanical machinery
✔ Structural parts
✔ Agriculture: Irrigation Systems and Machinery
✔ Energy: oil pipelines, renewable energy installations
✔ Machinery production, hydraulic systems, and conveyor components
FAQ
1.What is the difference between DOM tubing (mandrel drawn tubing) and standard ERW steel pipes?
✔ Tolerance: DOM steel tubing has stricter inner and outer diameter tolerances
✔ Appearance: DOM tubing is cold drawn by mandrel, and the surface weld is eliminated, whereas ERW steel pipe has an evident weld on its surface.
✔ Surface quality: The DOM tubes surface is smooth and free of visible flaws. ERW steel pipes surface is relatively rough.
✔ Performance: DOM tube has greater strength and toughness, and its performance is similar to seamless pipe; the ERW pipe weld is a weak point.
2.Whats the difference between DOM tubing and cold drawn seamless pipe?
✔ Raw Materials: The former is composed of ERW pipe, whereas the latter is further processed from hot-rolled seamless steel pipe.
✔ Weld seams: The weld seam of DOM tubing is nearly undetectable but still present, whereas cold drawn seamless pipe has no weld seam.
✔ Cost: DOM tubing typically undergoes only one cold drawing process, whereas cold drawn seamless pipe may experience numerous cold drawing procedures; hence, in theory, the price of DOM tubes is substantially lower.
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