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Our Hydraulic Shock Absorber Tubes are manufactured using the Cold Drawn Welded (CDW) process from SPHC hot rolled steel, conforming to EN 10305-2 precision tube standards.
Our Hydraulic Shock Absorber Tubes are manufactured using the Cold Drawn Welded (CDW) process from SPHC hot rolled steel, conforming to EN 10305-2 precision tube standards.
These tubes feature excellent dimensional accuracy, weldability, and good surface finish, making them well-suited for heavy-duty hydraulic shock absorbers used in trucks, buses, industrial equipment, and agricultural machinery.
Key Features
·Standard: EN 10305-2 (Welded Precision Steel Tubes)
·Material: SPHC hot rolled steel
·Process:
Cold Drawn Welded (CDW) for accuracy & strength
Excellent weldability & formability
Suitable for large-diameter shock absorber cylinders
Consistent mechanical performance & straightness
Available with additional surface treatments: phosphated, oiled, or e-coated
Technical Specifications
|
Parameter |
Specification |
|
Standard |
EN 10305-2 |
|
Steel Grades |
SPHC, E215, E235, SAE 1010 / 1020 |
|
Outside Diameter (OD) |
Ø40 – Ø100 mm (example: Ø90.2 mm) |
|
Wall Thickness (WT) |
1.0 – 3.0 mm (example: 1.6 mm) |
|
Process |
Cold Drawn Welded (CDW) |
|
Straightness |
≤ 0.5 mm per meter |
|
Surface Finish |
As-drawn or phosphated / oiled / coated |
|
Applications |
Hydraulic shock absorbers for trucks, buses, off-road vehicles, and heavy machinery |
Common Sizes Available
|
OD (mm) |
WT (mm) |
Typical Steel Grade |
Process |
|
Ø40 |
1.5 |
E215 / SAE 1010 |
CDW |
|
Ø60 |
2.0 |
E235 / SAE 1020 |
CDW |
|
Ø76 |
2.5 |
SPHC |
CDW |
|
Ø90.2 |
1.6 |
SPHC |
CDW |
|
Ø100 |
3.0 |
SPHC / E235 |
CDW |
Manufacturing Process
1. Hot Rolled Strip Steel (SPHC) – base material selection
2. Tube Forming & Welding – electric resistance welded (ERW) into tube shape
3. Cold Drawing – improves dimensional accuracy and mechanical properties
4. Heat Treatment – stress relieving or normalizing for consistency
5. Finishing – cutting, straightening, end preparation
6. Optional Surface Treatments – phosphated, oiled, e-coated for corrosion resistance
7. Inspection & Testing – dimensional checks, weld integrity, straightness
Advantages
·Cost-effective compared to seamless tubes
·Excellent weldability for shock absorber assembly
·High dimensional accuracy from cold drawing
·Large diameter range for heavy-duty applications
·Flexible surface treatment options
Applications
Hydraulic shock absorbers for:
·Heavy trucks & buses
·Agricultural machinery
·Construction equipment
·Industrial dampers
·Also used in hydraulic cylinders where CDW precision tubing is suitable
Suao is a professional manufacturer of high-precision cold drawn steel tubes, hydraulic tubes, and mechanical structure tubes, integrating R&D, production, inspection, and global sales. We operate two major production facilities covering over 36,000 square meters, with more than 200 employees and an annual output of 50,000+ tons, supplying customers across major industrial markets worldwide. As Suppliers of Hydraulic Shock Absorber Tube – EN 10305-2, SPHC Steel, Cold Drawn Welded (CDW), Ø90.2 x 1.6 mm, our integrated manufacturing capabilities include cold drawing, heat treatment, straightening, finishing, cutting, chamfering, and surface treatment. These are supported by a full range of advanced equipment for non-destructive testing, chemical analysis, and online dimensional monitoring—ensuring every tube meets stringent quality standards. We invest continuously in automation and smart manufacturing systems to enable flexible, high-mix, low-volume production. Custom Hydraulic Shock Absorber Tube – EN 10305-2, SPHC Steel, Cold Drawn Welded (CDW), Ø90.2 x 1.6 mm. Our products are widely used in construction machinery, hydraulic systems, automotive parts, wind energy, shipbuilding, railways, and oil & gas sectors. Certified to ISO 9001, ISO 14001, CE, and RoHS standards, Hongli is more than a manufacturer—we are a trusted long-term partner for global industrial clients.
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