Understanding the Mechanical Properties of ST35 Seamless Tubes
ST35 seamless tubes are widely used in industrial and engineering applications due to their excellent mechanical strength, machinability, and reliability. As a leading ST 52 Tubes Supplier and ST52 Carbon Steel Pipe distributor in India, ASC LLP brings you this detailed guide to help you understand how ST35 tubes compare with higher-grade materials like ST52 Seamless Tubes and why these mechanical properties matter for performance-critical applications.
What Are ST35 Seamless Tubes?
ST35 seamless tubes are low-carbon, non-alloy steel tubes manufactured to meet DIN 2391 specifications. These tubes are commonly used in hydraulic systems, boilers, and mechanical structures. Known for their good forming and welding capabilities, ST35 tubes offer a balanced mix of ductility and strength.
Chemical Composition of ST35:
| Element | Composition (%) |
| Carbon (C) | ≤ 0.17 |
| Manganese (Mn) | ≤ 1.13 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
Mechanical Properties of ST35 Seamless Tubes
The performance of ST35 seamless tubes is largely driven by their mechanical properties, which are critical in applications involving stress, pressure, and structural integrity.
Key Mechanical Properties:
| Property | Value |
| Tensile Strength | 480 – 630 MPa |
| Yield Strength | ≥ 235 MPa |
| Elongation | ≥ 25% |
| Impact Toughness | Good at low temperatures |
| Hardness | ~130 HB (Brinell) |
These properties make ST35 an excellent choice for components subjected to moderate pressure and dynamic loads.
ST35 vs. ST52 Seamless Tube: Key Differences
While ST35 Carbon steel tubes are ideal for low-pressure systems, ST52 Seamless Tubes (DIN 1.0570) are preferred for more demanding applications. Let’s look at how ST52 outperforms ST35:
| Feature | ST35 | ST52 (DIN 1.0570) |
| Yield Strength | ≥ 235 MPa | ≥ 355 MPa |
| Tensile Strength | 480–630 MPa | 490–630 MPa |
| Elongation | ≥ 25% | ≥ 21% |
| Applications | Light hydraulic systems | Heavy-duty machinery, bridges, automotive |
With higher tensile and yield strength, ST52 Steel Tube is better suited for high-load structures and is commonly supplied as ST52.3 Steel Cold Finished Tube or ST 52.3 Steel Welded Tube.
Applications of ST35 Seamless Tube
Thanks to their consistent dimensional accuracy and ductility, ST35 seamless tubes are used in:
- Hydraulic cylinder systems
- Automotive brake systems
- Boiler tubes and heat exchangers
- Mechanical and structural engineering
- General pipework in low-pressure applications
Why Choose ASC LLP?
As a trusted EN 1.0570 Precision Steel Tube supplier in Mumbai, ASC LLP offers a comprehensive range of seamless and welded carbon steel tubes tailored to industry standards. Whether you need ST52 Hot Finished Seamless Tubes or precision-drawn ST52.3 Steel Cold Finished Tubes, we provide:
✅ Certified quality assurance
✅ Competitive pricing
✅ Fast delivery across India and abroad
✅ Expert consultation on Carbon St52 Tube Material Properties
Conclusion
Understanding the mechanical properties of ST35 seamless tubes is essential for choosing the right material for your project. While ST35 offers great performance for medium-pressure applications, ST52 CS Tubes are the better choice when higher strength is needed.
If you’re looking for a reliable ST52 Carbon Steel Pipe distributor in India or a reputed EN 1.0570 Precision Steel Tube supplier in Mumbai, get in touch with ASC LLP. We deliver value, quality, and performance in every pipe we supply.
Explore the full range of ST35 CS tubes at Amardeep Steel Centre LLP, and let us help you elevate your projects to new heights. Follow us on LinkedIn, Facebook, and Instagram.
