BS EN 10025 S235JR steel is a very common and widely used material grade for manufacturing Longitudinal Submerged Arc Welded (LSAW) pipes . This combination is a standard product offered by numerous manufacturers globally and is frequently specified for a wide range of structural and general engineering applications [citation:2, citation:3, citation:4, citation:5].
It is important to understand that "BS EN 10025 S235JR" refers to the material grade of the steel plate. The finished LSAW pipe product is typically manufactured to a specific European product standard, most commonly EN 10219 for structural hollow sections, where the pipe grade is designated as S235JRH [citation:7, citation:9].
Here is the detailed specification for a BS EN 10025 S235JR LSAW pipe:
Key Specifications
| Attribute | Description |
|---|---|
| Material Standard | BS EN 10025-2: Hot-rolled products of structural steels. This standard specifies the technical delivery conditions for the steel plate [citation:8, citation:9]. |
| Steel Grade | S235JR: A common non-alloy structural steel grade. The "235" indicates the minimum yield strength in MPa. The suffix "JR" denotes a specified minimum impact energy of 27 Joules at room temperature (+20°C) [citation:8, citation:9]. |
| Product Standard | EN 10219-1 / -2: Cold-formed welded structural hollow sections of non-alloy and fine grain steels. This is the governing standard for the finished LSAW pipe product, with the hollow section grade designated as S235JRH [citation:7, citation:9]. Other product standards like EN 10217 (for pressure purposes) may also be applicable . |
| Process | LSAW (Longitudinal Submerged Arc Welding) : Pipes are manufactured by forming steel plates into a cylinder (using JCOE or UOE technology) and welding the longitudinal seam both internally and externally using a submerged arc process. This process is well-suited for producing large-diameter pipes with thick walls [citation:1, citation:2, citation:5, citation:8]. |
| Chemical Composition (max %) [citation:7, citation:9] | |
| Carbon (C): 0.17 | |
| Silicon (Si): 0.35 - 0.50 | |
| Manganese (Mn): 1.40 | |
| Phosphorus (P): 0.035 | |
| Sulfur (S): 0.030 - 0.035 | |
| Mechanical Properties (min) [citation:4, citation:7, citation:9] | |
| Yield Strength (t ≤ 16mm): 235 MPa | |
| Yield Strength (16mm < t ≤ 40mm): 225 MPa | |
| Tensile Strength: 360-510 MPa | |
| Elongation: ≥ 24% (for thickness > 3mm) | |
| Impact Properties [citation:4, citation:9] | Charpy V-notch Impact Energy: 27 J minimum at +20°C |
| Typical Size Range [citation:2, citation:3, citation:5, citation:7] | |
| Outside Diameter: 219 mm to 2500 mm (approx. 8" to 98") | |
| Wall Thickness: 5 mm to 75 mm | |
| Length: 3 m to 18.3 m (customizable, up to 32 m or more available) | |
| Manufacturing Steps [citation:1, citation:2, citation:5, citation:7] | 1. Steel plate selection and edge milling. 2. Edge crimping and forming using JCOE or UOE processes. 3. Internal and external submerged arc welding. 4. Mechanical expanding (for UOE/JCOE). 5. Non-destructive testing (Ultrasonic, X-ray). 6. Hydrostatic testing. 7. End facing and beveling. |
| Common Applications [citation:1, citation:5, citation:8, citation:9] | General structural engineering; building construction frames and columns; bridge components; piling foundations; machinery manufacturing; low-pressure fluid transmission (water, gas, oil); shipbuilding; infrastructure projects. |
| Certification | Mill Test Certificate typically to EN 10204 / 3.1 [citation:3, citation:5]. |
Understanding the Grade Designation
The designation S235JRH (for the finished pipe) follows a logical structure defined in EN 10219 and EN 10025 :
| Component | Meaning |
|---|---|
| S | Structural Steel |
| 235 | Minimum yield strength of 235 MPa (for thicknesses ≤ 16mm) |
| JR | Impact test requirement: 27 Joules minimum at room temperature (+20°C) |
| H | Hollow Section (conforms to EN 10219) |
Summary
In conclusion, BS EN 10025 S235JR LSAW pipe is a well-established, versatile product that combines the reliable properties of S235JR structural steel with the robust LSAW manufacturing process. It is primarily manufactured to the EN 10219 product standard as S235JRH and is widely used for a broad range of structural, construction, and general engineering applications [citation:2, citation:5, citation:9]. The LSAW process enables the production of large-diameter pipes with thick walls, making it suitable for major infrastructure projects [citation:1, citation:5]. When specifying, it is best practice to reference both the material grade and the applicable product standard (e.g., EN 10219 S235JRH LSAW pipe).
