Cold Drawn ERW Steel Tube | Precision Welded Tubing Supplier from China
Model: Customizable
Brand: CHENGXIN
HS Code: 730630
Minimum Order: 1 Ton
Product Description
Our Cold Drawn ERW Steel Tube, also known as Drawn Over Mandrel (DOM) tubing, is a type of electric resistance welded (ERW) tube that undergoes a secondary cold drawing process to improve dimensional accuracy, concentricity, and surface finish. It offers superior mechanical properties compared to standard welded tubes and is widely used in high-performance applications such as automotive structures, machinery parts, furniture tubing, and hydraulic cylinders.
1. Product Features
Excellent Surface Condition — Smooth, clean finish with internal and external oil coating for corrosion protection
High Dimensional Precision — Tight OD/ID tolerances due to cold drawing over mandrel process
Superior Concentricity — Ideal for components requiring strict fit and alignment
Improved Tensile Strength — Suitable for structural and mechanical applications demanding load-bearing capacity
2. Product Specifications
Commodity: Cold Drawn ERW Steel Tube (DOM Tube)
Standard & Grades: ASTM A512: MT1010, MT1020; EN 10305-2: E195, E235, E355; DIN 2393-2: ST37.2, ST44.2, ST52.3
Size Range: OD: 70mm – 325mm; Wall Thickness: 2mm – 15mm
3. Manufacturing Process
Manufactured via hydraulic cold drawing from ERW mother tubes, followed by heat treatment to meet required mechanical properties
Delivery Conditions: BK (+C) Cold finished, BKW (+LC) Cold drawn, BKS (+SR) Stress relieved, GBK (+A) Annealed, NBK (+N) Normalized
End Finish: Plain ends, square cut, burr-free (optional beveling available)
Surface Protection: Internal and external oil coating
Marking: As per customer requirements
Packing: PVC bags + steel strip bundles + end plastic caps
4. Applications
Hydraulic cylinder shells and liners
Automotive axles and chassis components
Gym and fitness equipment
Machine structure and mechanical frame systems
Agricultural and construction equipment
5. Advantages
Manufactured in China with strict dimensional control
Seamless appearance despite being welded — ideal substitute for seamless steel in some cases
ISO 9001 certified production with full traceability
Competitive pricing for welded tube and cold drawn steel from China
One-stop service from production to surface finishing and export packaging
6. FAQ
Q1: What is the minimum order quantity (MOQ)?
A: Generally 1 ton per size.
Q2: What’s the lead time for delivery?
A: 20–35 days, depending on stock and raw material availability.
Q3: Can I request a third-party inspection before shipment?
A: Yes, we welcome inspections from customers or certified third parties.
Q4: What are your payment terms?
A: T/T, L/C, D/P — terms based on buyer credit evaluation.
Q5: How do you control quality?
A: We source mother tubes from premium mills and inspect every production stage. 100% of tubes are tested for dimensional and mechanical conformity before delivery.
Company Profile
With over 20 years of experience, CHENGXIN is a trusted manufacturer of cold drawn steel tubes, including seamless precision tubes (EN 10305-1), cold drawn welded tubes (EN 10305-2), mechanical tubing (ASTM A519), ERW welded tubes (ASTM A512), and hydraulic cylinder tubes and honed pipes. Located in a 32,000㎡ facility, our factory operates 12 workshops equipped with advanced cold drawing benches, ERW mills, inspection equipment, and in-house tooling production.
