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High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy

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High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy

Brand Name : Torich

Model Number : DOM

Certification : ISO 9001 ISO14001 TS16949

Place of Origin : China

MOQ : 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

Delivery Time : 20-30days upon products

Packaging Details : In bundles or in wooden boxes.

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

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High Precision Cold Drawn DOM Welded Tubes With Good Mechanical Properties
High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy

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
High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy
High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy
High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy
High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy

High Precision Cold Drawn DOM Welded Tube with Good Mechanical Properties and Controlled OD/ID Accuracy
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.

Product Tags:

drawn over mandrel steel tube

      

dom metal tubing

      
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