Tianjin Brisk Steel is one of the manufacturers of API 5L PSL1 ERW Steel Gas Pipe in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
Technical Overview: The Science Behind EN 10255 S195T
Understanding the exact engineering parameters of this product enables procurement teams to specify it with complete confidence:
- The EN 10255 Standard: This specification (formerly known as BS 1387) governs non-alloy steel tubes suitable for welding and threading. It outlines strict dimensional categories-traditionally classified as Heavy (H), Medium (M), and Light (Type L, L1, or L2) series-ensuring a precise fit across standard industrial hardware.
- S195T Steel Grade: The "S" identifies it as structural/utility steel, "195" guarantees a minimum yield strength of 195 MPa, and the "T" explicitly certifies that the material is metallurgically formulated and tested for threading applications.
- The HFI/ERW Process: Our tubes are cold-formed from premium steel strips and welded longitudinally using High-Frequency Induction (HFI) Electric Resistance Welding. This creates a solid, flush weld seam with uniform grain structures that match the burst pressure capacity of the parent steel body.
Technical Specifications & Product Matrix
We supply and export EN 10255 S195T tubes tailored to major international utility standards:
| Parameter | Specifications & Capabilities |
| Standard Compliance | EN 10255 (Formerly BS 1387), ISO 65 |
| Steel Grade | S195T (Minimum Yield: 195 MPa | Tensile: 320–520 MPa) |
| Series Categories | Heavy (H), Medium (M), Light (L, L1, L2) |
| Nominal Diameter (DN) | DN10 to DN150 (3/8" to 6" Nominal Size) |
| Wall Thickness (WT) | 2.0mm to 5.4mm (depending on series selection) |
| Length Profiles | 5.8m (for 20ft containers), 6.0m (Standard European length), or custom fixed sizes |
| End Execution | Plain Square Cut, Factory Beveled, or Threaded and Coupled (T&C) |
| Surface Treatments | Bare/Oiled, Black Protective Varnish, Hot-Dip Galvanized (HDG) |
Common Dimension
| DN | OD | M Series | H Series |
|---|---|---|---|
| 1/2" DN15 | 21.3mm | 2.6mm | 3.2mm |
| 3/4" DN20 | 26.9mm | 2.6mm | 3.2mm |
| 1" DN25 | 33.7mm | 2.9mm | 4.0mm |
| 1.5" DN40 | 48.3mm | 3.2mm | 4.0mm |
| 2" DN50 | 60.3mm | 3.6mm | 4.5mm |
| 3" DN80 | 88.9mm | 4.0mm | 5.0mm |
| 4" DN100 | 114.3mm | 4.5mm | 5.4mm |
Frequently Asked Questions (FAQ)
Q: What is the main operational difference between the "Medium" and "Heavy" series in EN 10255?
A: The primary difference lies in wall thickness and maximum working pressure. For example, a DN50 (2") Medium series pipe features a wall thickness of 3.6mm, while the Heavy series version has a wall thickness of 4.5mm. The Heavy series provides extra mechanical protection against physical impact, offers higher pressure thresholds, and is generally selected for high-demand industrial steam lines or exposed fire protection networks.
Q: Why is the "T" suffix in S195T important for my procurement team?
A: The "T" ensures that the steel melt has undergone specific metallurgical controls to guarantee its suitability for mechanical threading. Standard structural steels might be too hard or brittle, causing thread-cutting dies to tear the metal or wear down prematurely. S195T has the exact grain structure required for smooth, leak-free thread integration.
Q: How do you prevent internal and external rust damage during long sea freights?
A: For bare or black-varnished pipe orders, we apply a standardized exterior layer of light anti-rust oil or industrial primer. Pipe ends are fitted with heavy-duty plastic protectors to safeguard factory threads or bevels from impact and block salty sea air from gathering inside the bore. Galvanized versions are treated with an additional passivation solution to prevent "white rust" storage staining during transit.
Q: Can your mill handle independent third-party inspections (TPI) prior to shipment?
A: Yes, absolutely. We welcome independent pre-shipment inspections from globally recognized auditing agencies such as SGS, Bureau Veritas (BV), Intertek, and TÜV. Inspectors are fully accommodated to audit our raw steel certificates, monitor real-time welding parameters, witness mandated hydrostatic pressure runs, and verify final packing specifications.
BRISK STEEL
Keep your projects moving forward with fully certified materials and robust logistics. Contact our international sales engineering division today to check our live inventory, request specific custom wall thicknesses, or receive a competitive FOB or CIF quotation tailored directly to your preferred port.
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