ISO 9330-3:1997 specifies technical delivery conditions for electric resistance welded (ERW) and induction welded circular steel tubes made from unalloyed and alloyed steels with specified low-temperature toughness properties. It covers tubes with wall thickness up to and including 16 mm and is intended for low-temperature piping systems. The current published edition remains ISO 9330-3:1997; ISO states that it was last reviewed and confirmed in 2012. Ladhani Metal Corporation is a manufacturer, supplier, and exporter of ISO 9330-3 Welded Steel Tubes, supplied in required grades, outside diameters, wall thicknesses, lengths, and delivery conditions. Products can be supplied with mill test certificates and strict quality inspection as per international standards. Available Grades PL 21 | PL 23 | PL 25 | PL 26 | 11MnNi5-3 | 13MnNi6-3 | 12Ni14 | X12Ni5 Forms of Supply • ERW Steel Tubes | Electric Resistance Welded Tubes | Induction Welded Tubes | Hot-Finished Tubes | Cold-Finished Tubes | Circular Steel Tubes | Low-Temperature Tubes | Pressure Tubes | Cut-to-Length Tubes Steel Types • Unalloyed Low-Temperature Steel | PL 21 | PL 23 | PL 25 | PL 26 • Manganese-Nickel Alloy Steel | 11MnNi5-3 | 13MnNi6-3 • Nickel Alloy Steel | 12Ni14 | X12Ni5 Chemical Composition – Example Grade PL 21 • Carbon (C): Max. 0.17% • Silicon (Si): Max. 0.35% • Manganese (Mn): 0.40–1.00% • Phosphorus (P): Max. 0.030% • Sulfur (S): Max. 0.025% • Aluminium (Al): Min. 0.015% The standard requires the steels covered by ISO 9330-3 to be fully killed. Mechanical Properties • PL 21: Tensile strength 360–480 MPa | Minimum yield strength 215 MPa | Elongation min. 24% • PL 23: Tensile strength 410–530 MPa | Minimum yield strength 235 MPa | Elongation min. 22% • PL 25: Tensile strength 360–490 MPa | Minimum yield strength 255 MPa | Elongation min. 21% • PL 26: Tensile strength 460–580 MPa | Minimum yield strength 265 MPa | Elongation min. 21% • 11MnNi5-3: Tensile strength 410–530 MPa | Minimum yield strength 285 MPa | Elongation min. 22% • 13MnNi6-3: Tensile strength 490–610 MPa | Minimum yield strength 355 MPa | Elongation min. 20% • 12Ni14: Tensile strength 440–590 MPa | Minimum yield strength 245 MPa | Elongation min. 16% • X12Ni5: Tensile strength 510–710 MPa | Minimum yield strength 390 MPa | Elongation min. 17% Manufacturing and Delivery Conditions ISO 9330-3 tubes are manufactured using electric resistance or induction welding without filler metal. They may be supplied hot-finished or cold-finished and are suitably heat treated over their full length. Depending on the grade, normalizing, normalizing and tempering, or quenching and tempering may be used. Key Features • ERW and induction welded construction • Specified low-temperature toughness • Good weldability • Suitable for pressure piping • Controlled chemical composition • Reliable mechanical properties • Suitable for low-temperature service • Hot-finished and cold-finished options • Smooth internal and external surfaces • Available in different diameters and wall thicknesses Material Characteristics ISO 9330-3 steels are specifically designed for applications where welded steel tubes must maintain suitable strength and impact toughness at low temperatures. The standard includes Charpy V-notch impact requirements at specified temperatures for the covered grades. Applications • Low-Temperature Piping • Pressure Piping Systems • Refrigeration Systems • Cryogenic-Related Equipment • Petrochemical Piping • Oil and Gas Equipment • Chemical Processing Systems • Cold-Temperature Process Lines • Industrial Piping Systems • General Pressure Applications Conclusion ISO 9330-3 Welded Steel Tubes provide reliable solutions for low-temperature piping systems requiring welded construction, controlled mechanical properties, and specified impact toughness. The standard covers unalloyed and alloyed grades including PL 21, PL 23, PL 25, PL 26, 11MnNi5-3, 13MnNi6-3, 12Ni14 and X12Ni5. To place an order or make an enquiry for ISO 9330-3 Welded Steel Tubes, contact Ladhani Metal Corporation for your required grade, outside diameter, wall thickness, length, delivery condition, and quantity. #ISO9330-3 #ISO9330 #ISO9330-3SteelTubes #ISO9330-3Steel #ISO9330-3Standard #WeldedSteelTubes #SteelTubes #WeldedSteelPipe #PressureSteelTubes #PressurePurposeSteel #CarbonSteelTubes #AlloySteelTubes #SteelTubeManufacturer #SteelTubeSupplier #SteelTubeExporter #WeldedTubeManufacturer #WeldedTubeSupplier #WeldedTubeExporter #IndustrialSteel #EngineeringSteel #SteelProducts #SteelStockist #SteelDistributor #SteelManufacturer #SteelSupplier #SteelExporter #IndustrialMaterials #InternationalSteelStandards #PressureVesselSteel #LadhaniMetalCorporation #Mumbai #Delhi #Chennai #Kolkata #Bengaluru #Hyderabad #Ahmedabad #Pune #Surat #Jaipur #Lucknow #Kanpur #Nagpur #Indore #Srinagar #Aurangabad #Dhanbad #Amritsar #NaviMumbai #Allahabad #Ranchi
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