SMO 254, chemically known as UNS S31254 or EN 1.4547 (X1CrNiMoCuN20-18-7), is a high-alloy stainless steel grade developed for superior resistance to pitting, crevice corrosion, and stress-corrosion cracking. It contains about 19.5–20.5% chromium, 17.5–18.5% nickel, 6.0–6.5% molybdenum, and 0.18–0.25% nitrogen, giving it exceptional corrosion tolerance. The alloy is often referred to as “6 Mo” because of its high molybdenum content. SMO 254 round bars are produced according to standards such as ASTM A276 and ASTM A479, and conform to ASME designations for bar products.

SMO 254 round bars offer multiple benefits for demanding applications High corrosion resistance Exceptional resistance to pitting, crevice corrosion and stress-corrosion cracking in chloride-bearing media.

Excellent mechanical strength Roughly double the strength of conventional 300-series stainless steels under similar conditions. Good weldability and fabricability Easily welded and worked, with minimal loss of corrosion performance. Superior durability and longevity High resistance to erosion, wear, oxidation and general corrosion extends operational life. Versatility in finish Available in bright, black, polished or turned finishes to suit different engineering needs.

The SMO 254 Round Bars are used extensively across industries due to their ability to withstand harsh environments.

• Marine applications: SMO 254 round bars provide unmatched resistance in seawater and chlorinated environments, making them ideal for desalination plants, offshore platforms, and seawater cooling systems.

• Chemical processing: In aggressive chemical media, the corrosion resistance and strength of SMO 254 make it suitable for reactors, pumps, valves, and process tanks.

• Oil & Gas industry: These round bars are used in drilling rigs, piping systems, and structural components where exposure to chlorides and high pressures is common.

• Heat exchangers: The combination of strength and corrosion resistance ensures reliable performance in condensers, evaporators, and heat transfer equipment.

• Pharmaceutical and food processing: SMO 254 maintains purity and strength in equipment like bleaching systems and storage vessels.

• Desalination systems: Its resistance to saltwater corrosion and longevity make it a preferred choice for plants converting seawater into potable water.

As one of the prominent SMO 254 Round Bars Stockists, SMM Industries LLP provides timely supply to all these industries with full traceability and testing certifications.

The strength of these bars is noteworthy — with a minimum tensile strength of around 650 MPa and 0.2% proof (yield) strength of about 300 MPa, along with at least 35% elongation in 50 mm. Their PRE (Pitting Resistance Equivalent) index is ≥ 42.5, which translates to outstanding resistance in chloride environments. These bars are solution-annealed (typically at 1150–1200 °C) and rapidly cooled to retain their corrosion-resistant microstructure. SMM Industries LLP’s control over material quality, finishing (bright, polished or black), and dimensional tolerances ensures that each bar meets customer specifications precisely.

SMO 254 is known by different names and standards around the world: UNS S31254 (USA), W.Nr. 1.4547 (Germany), EN designation X1CrNiMoCuN20-18-7 (Europe), SIS grade 2378 (Sweden), and AFNOR Z1 CNDU 20.18.06Az (France). These bars are available under ASTM A276 / A479 specifications and corresponding ASME SA276 / SA479 in many markets.

At SMM Industries LLP, we are recognized among the top SMO 254 Round Bars Manufacturers, driven by rigorous quality control, full certification, and consistent supply. We serve clients as reliable SMO 254 Round Bars Suppliers, maintaining stock and readily processing queries. As prominent SMO 254 Round Bars Stockists, we offer a wide range of sizes, finishes, and lengths. Our global reach also positions us as strong SMO 254 Round Bars Exporters, delivering world-class materials to clients across industries and geographies.

Our commitment goes beyond supplying material: we provide expert guidance on grade selection, industry-standard equivalencies, and application-specific advice. Every batch of SMO 254 round bars is traceable, tested for mechanical properties, and certified to conform to international standards like ASTM/ASME. With SMM Industries LLP, you get a partner who understands the technical demands, logistical challenges, and compliance needs of advanced stainless steel procurement.