Products Description
| Parameter | Range |
| Product | ST52 Grade Seamless Pipe |
| Outer Diameter (OD) | 10–660 mm (up to over 630 mm for hot-rolled) |
| Wall Thickness (WT) | 1.6–75 mm, depending on application |
| Length | 6–12 meters (fixed or random) |
| Applicable Standards | DIN 1629, DIN 2391, EN 10297-1, GB/T 8162 |
| Production Process | Hot rolling, cold drawing, cold rolling |
Chemical Composition
| Element | Content (%) |
| Carbon (C) | ≤ 0.22 |
| Silicon (Si) | ≤ 0.55 |
| Manganese (Mn) | 1.40–1.60 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
Mechanical Properties
| Property | Value |
| Yield Strength (≤16 mm thickness) | ≥ 355 MPa |
| Tensile Strength | 490–630 MPa |
| Elongation | ≥ 18% |
| Impact Energy (0°C) | ≥ 23 J |
Why do we choose ST52 Grade Seamless Pipe
| Advantage | Explanation |
| High Strength | Offers a minimum yield strength of 355 MPa and tensile strength up to 630 MPa, making it suitable for heavy-load applications like construction, machinery, and pressure systems. |
| Good Weldability | With controlled carbon content (≤0.22%) and low sulfur/phosphorus levels, it ensures stable welding performance without cracking, ideal for fabrication and on-site assembly. |
| Seamless Structure | No welded joints mean higher pressure resistance, reduced risk of leakage, and uniform mechanical properties-critical for hydraulic, pneumatic, and boiler systems. |
| Durability & Toughness | High manganese content enhances toughness, while impact resistance (≥23 J at 0°C) ensures reliable performance in cold or dynamic conditions. |
| Broad Compatibility | Complies with international standards such as DIN 17100, EN 10025, and GB/T 8162, enabling global sourcing and engineering acceptance. |
| Versatile Applications | Used across industries including construction, automotive, energy, and mechanical engineering, from structural frames to high-pressure fluid transport. |
Main Applications of ST52 Grade Seamless Pipe
★Hydraulic & Pneumatic Systems: Preferred for cylinders and high-pressure fluid transmission due to smooth inner surface and structural integrity.
★Construction & Bridges: Used as load-bearing structural components in buildings, trusses, and bridge frameworks.
★Machinery & Equipment: Found in excavators, cranes, agricultural machinery, and railway systems.
★Energy & Petrochemicals: Applied in boilers, pressure vessels, and pipeline systems operating at temperatures up to 300°C.
★Automotive Industry: Utilized in chassis, axles, and fluid transport systems.
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