High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy
Basic Properties
Place of Origin:
China
Brand Name:
Torich
Certification:
ISO 9001 ISO14001 TS16949
Model Number:
DOM
Trading Properties
Minimum Order Quantity:
5 tons
Price:
800-1200USD/ton
Payment Terms:
L/C,T/T,D/A,D/P,T/T,Western Union,MoneyGram
Supply Ability:
60000tons per year
Product Summary
High Precision Cold Drawn DOM Welded Tubes With Good Mechanical Properties High precision cold drawn DOM welded tubes are ERW carbon steel mechanical tubes processed by cold drawing over a mandrel to improve OD/ID accuracy, wall uniformity, concentricity, surface finish, and mechanical stability. ...
Product Details
Highlight:
drawn over mandrel steel tube
,dom metal tubing
Material:
Low-carbon And Medium-carbon Unalloyed Steel For ERW And Cold Drawn DOM Tube Production
Standards:
ASTM A513/A513M Type 5, EN 10305-2, SAE J525, JIS G 3445, GOST 10707, GB/T 24187, GB/T 13793 By Agreement
Grades:
EN E155, E195, E235, E275, E355; ASTM/SAE Carbon Steel Grades By Order
Outside Diameter:
5.0–200 Mm; EN 10305-2 Precision Certified Range Normally Applies Up To D ≤ 150 Mm
Wall Thickness:
0.5–20 Mm; EN Preferred Precision Table Normally Covers 0.5–10 Mm, With Heavier Wall By Agreement
Length:
1–12 M, Fixed Length Or Random Length; Cut-to-length Service Available
Tolerance Range:
Typical OD Tolerance: ±0.08 To ±0.80 Mm Depending On Diameter; Wall Tolerance: ±7.5% Or ±0.10 Mm, Whichever Is Greater; Reduced Tolerance By Agreement
Heat Treatment:
+C Cold Drawn/hard, +LC Soft Cold Drawn, +SR Stress Relieved, +A Annealed, +N Normalized; Delivery Condition Must Be Stated In The Purchase Order
Product Description
High Precision Cold Drawn DOM Welded Tubes With Good Mechanical Properties
High precision cold drawn DOM welded tubes are ERW carbon steel mechanical tubes processed by cold drawing over a mandrel to improve OD/ID accuracy, wall uniformity, concentricity, surface finish, and mechanical stability. They are suitable when ordinary ERW tubing is not precise enough for machining, press-fitting, bearing support, or controlled assembly clearance. For international purchasing, the recommended baseline is ASTM A513/A513M Type 5 for DOM mechanical tubing or EN 10305-2 for welded cold drawn precision tubes.
Specifications
| Item | Standard Supply Description |
|---|---|
| Material | Low-carbon and medium-carbon unalloyed steel for ERW and cold drawn DOM tube production |
| Standards | ASTM A513/A513M Type 5, EN 10305-2, SAE J525, JIS G 3445, GOST 10707, GB/T 24187, GB/T 13793 by agreement |
| Grades | EN E155, E195, E235, E275, E355; ASTM/SAE carbon steel grades by order |
| Outside Diameter | 5.0-200 mm; EN 10305-2 precision certified range normally applies up to D ≤ 150 mm |
| Wall Thickness | 0.5-20 mm; EN preferred precision table normally covers 0.5-10 mm, with heavier wall by agreement |
| Length | 1-12 m, fixed length or random length; cut-to-length service available |
| Tolerance Range | Typical OD tolerance: ±0.08 to ±0.80 mm depending on diameter; wall tolerance: ±7.5% or ±0.10 mm, whichever is greater; reduced tolerance by agreement |
| Straightness | For D > 15 mm and L > 1000 mm: max. 0.0015L for ReH ≤ 500 MPa; max. 0.002L for ReH > 500 MPa; not more than 3 mm per 1 m unless tighter straightness is specified |
| Surface Condition | Smooth OD and ID, bright or oiled surface; EN 10305-2 reference roughness Ra ≤ 4 µm; improved roughness available by agreement |
| Heat Treatment | +C cold drawn/hard, +LC soft cold drawn, +SR stress relieved, +A annealed, +N normalized; delivery condition must be stated in the purchase order |
Main Characteristics
- Controlled OD, ID, and wall uniformity
Diameter tolerance can be controlled from ±0.08 mm on smaller precision sizes up to ±0.80 mm on larger EN preferred sizes. Wall thickness tolerance is normally ±7.5% or ±0.10 mm, whichever is greater. When both OD and ID are specified, eccentricity control can be applied to improve concentricity. - Stable straightness for machining and assembly
For tubes above 15 mm OD and longer than 1000 mm, straightness can be controlled to 0.0015L for yield strength up to 500 MPa, with a maximum deviation of 3 mm over any 1 m length unless tighter straightness is agreed. - Defined surface roughness
The OD and ID surfaces are smooth after cold drawing, with an EN 10305-2 reference roughness of Ra ≤ 4 µm. Lower roughness values can be specified when the tube is used for sliding, telescopic, sealing, or precision-fit components. - Selectable mechanical strength level
In normalized condition, EN 10305-2 grades cover tensile strength from 270-410 MPa for E155 up to 490-630 MPa for E355. In stress relieved condition, E355 can reach minimum Rm 590 MPa, ReH 435 MPa, and elongation 10%. - Weld seam quality verification
For critical use, NDT can be specified for longitudinal imperfections or leak-tightness. Eddy current, flux leakage, or ultrasonic methods can be used depending on the selected standard and acceptance level. - Practical end preparation
Tubes are supplied with square-cut ends free from harmful burrs. Deburring, chamfering, or special end finishing can be specified for automated assembly or machining lines.
Our Advantages
| Professional Concern | How We Address It |
|---|---|
| Will the tube maintain ID accuracy after machining or press-fitting? | We recommend specifying OD + ID rather than OD + wall only for precision-fit parts. Eccentricity, ovality, and wall variation can be checked during production, and reduced tolerance can be agreed before mass production. |
| Will the weld seam survive expansion, bending, or mechanical loading? | For critical components, we can apply weld-area quality control through NDT, flattening, drift-expanding, or customer-specific validation tests. The delivery condition should be selected according to whether the tube requires forming, machining, or higher strength. |
| Will the supplied material match the drawing and certificate? | Tubes can be ordered by standard, grade, dimension, heat treatment, and inspection document type. For traceability, inspection certificates can include chemical composition, tensile results, dimensional records, surface condition, and batch identification. |
Applicable Standards
| Standard System | Relevant Standard | Scope Summary |
|---|---|---|
| ASTM | ASTM A513/A513M Type 5 | Electric-resistance-welded carbon and alloy steel mechanical tubing; Type 5 refers to drawn-over-mandrel tubing |
| SAE | SAE J525 | Welded and cold drawn low-carbon steel tubing for pressure lines requiring bending, flaring, forming, and brazing |
| EN | EN 10305-2 | Welded cold drawn precision steel tubes, typically for automotive, furniture, and general engineering use |
| GOST | GOST 10707 | Steel cold-deformed electrically welded tubes made from unalloyed carbon steel |
| JIS | JIS G 3445 | Carbon steel tubes for machine structure |
| GB | GB/T 24187 | Cold-drawn precision single welded steel tubes |
| GB | GB/T 13793 | Longitudinal electric-resistance-welded steel pipes |
Application Field
Automotive shock absorber cylinder tube -- used where the tube must provide controlled ID, stable straightness, good surface condition, and predictable mechanical performance for piston movement and assembly reliability.
Chemical Composition
| Grade | Steel No. | C Max | Si Max | Mn Max | P Max | S Max | Al Total Min |
|---|---|---|---|---|---|---|---|
| E155 | 1.0033 | 0.11 | 0.35 | 0.70 | 0.025 | 0.025 | 0.015 |
| E195 | 1.0034 | 0.15 | 0.35 | 0.70 | 0.025 | 0.025 | 0.015 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 | 0.015 |
| E275 | 1.0225 | 0.21 | 0.35 | 1.40 | 0.025 | 0.025 | 0.015 |
| E355 | 1.0580 | 0.22 | 0.55 | 1.60 | 0.025 | 0.025 | 0.020 |
Mechanical Properties
| Grade | Steel No. | +SR Rm Min MPa | +SR ReH Min MPa | +SR A Min % | +N Rm MPa | +N ReH Min MPa | +N A Min % |
|---|---|---|---|---|---|---|---|
| E155 | 1.0033 | 350 | 245 | 18 | 270-410 | 155 | 28 |
| E195 | 1.0034 | 370 | 260 | 18 | 300-440 | 195 | 28 |
| E235 | 1.0308 | 440 | 325 | 14 | 340-480 | 235 | 25 |
| E275 | 1.0225 | 510 | 375 | 12 | 410-550 | 275 | 22 |
| E355 | 1.0580 | 590 | 435 | 10 | 490-630 | 355 | 22 |
Product Image
Frequently Asked Questions
Q: Are you trading company or manufacturer?
A: Manufacturer, also can do trading.
Q: How long is your delivery time?
A: Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? Is it free or extra?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment?
A: Payment ≤ 2000USD, 100% in advance. Payment ≥ 2000USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.
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