EN 58M Grade Steel Pipes are high-quality seamless carbon steel pipes manufactured according to the EN 10216-2 European standard. These pipes are designed for medium-pressure applications and provide excellent strength, durability, and corrosion resistance. They are widely used in pipelines, boilers, water and gas systems, and structural applications. EN 58M pipes are recognized for their precise dimensions, uniform wall thickness, and consistent mechanical properties. They offer a reliable solution for industrial, commercial, and construction projects. Their versatile nature makes them a preferred choice for engineers and contractors.
EN 58M pipes are made from low-carbon steel with a carefully controlled chemical composition. The carbon content ranges between 0.17–0.22%, ensuring good weldability and ductility. Manganese, silicon, phosphorus, and sulfur are present in regulated amounts to enhance strength and toughness. Trace elements like chromium and nitrogen improve hardness and corrosion resistance. This balanced chemical composition ensures that the pipes perform reliably under moderate pressure and temperature conditions. It also allows easy fabrication and forming for various industrial uses.
EN 58M pipes are manufactured using seamless pipe production techniques. The process involves piercing solid billets and elongating them into pipes with uniform wall thickness. The pipes may also undergo cold or hot working to improve surface finish and mechanical properties. Heat treatment such as normalizing is applied to relieve internal stresses. Quality control measures, including ultrasonic testing, hydrostatic testing, and dimensional inspections, are employed at every stage. This ensures that each pipe meets EN standards and is free of defects or inconsistencies.
EN 58M Grade Steel Pipes have excellent mechanical properties. They offer tensile strength between 450–600 MPa and yield strength of ≥ 250 MPa. Elongation is ≥ 20%, ensuring flexibility and resistance to cracking during installation. Impact strength at room temperature is typically 27 J (Charpy V-notch), which guarantees toughness. Hardness is usually ≤ 160 HB, and the modulus of elasticity is around 210 GPa. These mechanical properties make EN 58M pipes suitable for moderate-pressure fluid transport, structural applications, and welded connections.
While EN 58M is not stainless steel, it provides moderate resistance to corrosion. Low sulfur and phosphorus content reduces the risk of scaling and pitting. The pipes can be coated, painted, or galvanized for enhanced durability, especially in outdoor or humid environments. Proper maintenance and protective measures extend the service life of EN 58M pipes. They are suitable for water, oil, and gas transportation, as well as industrial fluid systems.
EN 58M pipes are manufactured in compliance with EN 10216-2 standards. They are available in a wide range of diameters from 21.3 mm to 610 mm and wall thicknesses from 2 mm to 40 mm. Standard pipe lengths are typically 6 m or 12 m, but custom lengths can also be supplied. Dimensional tolerances for diameter, wall thickness, and length are strictly controlled. This ensures compatibility with fittings, flanges, and other piping components. Uniform dimensions are essential for seamless installation in pipelines and industrial systems.
| Specification | Details |
|---|---|
| Standard | EN 10216-2 |
| Grade | EN 58M |
| Type | Seamless Carbon Steel Pipes |
| Material | Low Carbon Steel |
| End Type | Plain End / Beveled End / Threaded End |
| Diameter Range | 21.3 mm – 610 mm (Outer Diameter) |
| Wall Thickness | 2.0 mm – 40 mm (depends on schedule) |
| Length | 6 m / 12 m or as per requirement |
| Surface Finish | Black / Painted / Galvanized |
| Mechanical Properties |
Tensile Strength: 450 – 600 MPa Yield Strength: ≥ 250 MPa Elongation: ≥ 20% |
| Test & Certification | Hydrostatic Test, Ultrasonic Test, Chemical & Mechanical Test Certificates |
| Applications | Pipelines, Water & Gas Transport, Boilers, Heat Exchangers, Structural Applications |
EN 58M pipes are widely used in industries such as power generation, chemical processing, oil and gas, and water supply. They are suitable for transporting fluids, gases, and steam under moderate pressure. Additionally, they are used in boilers, heat exchangers, and structural frameworks. Their versatility and reliability make them a preferred choice for both industrial and construction applications. EN 58M pipes are also used in HVAC systems, fire protection systems, and manufacturing facilities.
Heat treatment improves the mechanical properties of EN 58M pipes. Normalizing is commonly applied to relieve internal stresses and ensure uniformity. Pipes may also undergo annealing or quenching depending on specific requirements. Heat treatment enhances ductility, toughness, and wear resistance. It also ensures that the pipes can handle moderate temperature variations without structural degradation. Proper heat treatment ensures consistent quality and performance across all batches.
EN 58M pipes exhibit excellent weldability due to their low carbon content. They can be welded using manual, semi-automatic, or automatic methods. The pipes are easy to bend, thread, and flange without compromising structural integrity. Proper welding procedures following EN standards ensure strong joints. The pipes’ consistent microstructure ensures reliable performance after fabrication. Their flexibility and workability make them ideal for custom piping layouts and industrial installations.
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.17 – 0.22 |
| Manganese (Mn) | 0.35 – 0.65 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Silicon (Si) | 0.10 – 0.35 |
| Chromium (Cr) | ≤ 0.30 |
| Nitrogen (N) | ≤ 0.012 |
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 450 – 600 MPa |
| Yield Strength (ReH) | ≥ 250 MPa |
| Elongation (A) | ≥ 20% |
| Impact Strength | 27 J at 20°C (Charpy V-notch) |
| Hardness | ≤ 160 HB |
| Modulus of Elasticity (E) | ≈ 210 GPa |
| Density | ≈ 7.85 g/cm³ |
| Nominal Diameter (DN) | Outer Diameter (OD) mm | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|
| 15 | 21.3 | 2.0 – 3.2 | 1.2 – 1.8 |
| 20 | 26.9 | 2.3 – 3.6 | 1.7 – 2.6 |
| 25 | 33.7 | 2.6 – 4.0 | 2.3 – 3.4 |
| 32 | 42.4 | 2.6 – 4.5 | 3.2 – 4.8 |
| 40 | 48.3 | 2.9 – 4.8 | 3.8 – 5.5 |
| 50 | 60.3 | 3.2 – 5.0 | 5.0 – 7.1 |
| 65 | 76.1 | 3.6 – 5.5 | 6.5 – 9.8 |
| 80 | 88.9 | 4.0 – 6.3 | 8.5 – 13.0 |
| 100 | 114.3 | 4.5 – 7.1 | 12.0 – 18.5 |
| 125 | 139.7 | 4.8 – 8.0 | 16.5 – 25.0 |
| 150 | 168.3 | 5.0 – 8.8 | 22.0 – 32.0 |
| 200 | 219.1 | 5.6 – 9.5 | 33.0 – 51.0 |
| 250 | 273.0 | 6.3 – 11.0 | 51.0 – 81.0 |
| 300 | 323.9 | 7.1 – 12.5 | 72.0 – 111.0 |
| 350 | 355.6 | 7.6 – 14.0 | 90.0 – 140.0 |
| 400 | 406.4 | 8.0 – 15.0 | 115.0 – 180.0 |
| Standard | Equivalent Grade / Material |
|---|---|
| EN 10216-2 (Europe) | EN 58M |
| DIN (Germany) | St 37.4 / 1.0308 |
| BS (UK) | BS 3605 Grade 43M |
| ASTM (USA) | ASTM A106 Grade B / ASTM A53 Grade B |
| JIS (Japan) | STB 41 |
| IS (India) | IS 1239 Medium Class / IS 3589 |
| EN (Other European) | GS-45, P265GH (similar mechanical properties) |
EN 58M Grade Steel Pipes are seamless carbon steel pipes manufactured as per EN 10216-2 standard. They are suitable for medium-pressure applications in industrial, structural, and pipeline systems.
The pipes contain carbon 0.17–0.22%, manganese 0.35–0.65%, silicon 0.10–0.35%, phosphorus ≤ 0.035%, sulfur ≤ 0.035%, and trace elements like chromium and nitrogen.
Tensile strength ranges from 450–600 MPa, yield strength ≥ 250 MPa, elongation ≥ 20%, impact strength 27 J at 20°C (Charpy V-notch), and hardness ≤ 160 HB.
EN 58M pipes come in diameters from 21.3 mm to 610 mm, with wall thicknesses from 2 mm to 40 mm depending on schedule. Standard lengths are 6 m or 12 m, with custom lengths available.
Yes, EN 58M pipes have excellent weldability due to their low carbon content. Both manual and automated welding methods can be used following proper EN-standard procedures.
They are used in pipelines, water and gas transport, boilers, heat exchangers, structural frameworks, HVAC systems, and fire protection systems.
They provide moderate corrosion resistance. Protective coatings, painting, or galvanization improve durability, especially for outdoor or humid environments.
Equivalent grades include ASTM A106 Grade B (USA), BS 3605 Grade 43M (UK), DIN St 37.4 (Germany), JIS STB 41 (Japan), and IS 1239 Medium Class (India).
They undergo hydrostatic testing, ultrasonic inspection, mechanical tests for tensile and yield strength, impact tests, and chemical composition verification to meet EN standards.
Pipes should be stored in dry, ventilated areas, stacked carefully to avoid deformation, and handled with cranes or forklifts. Protective coatings are recommended for long-term storage.
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