MetalX Nickel Alloys

254 SMO Round Bar

Specification 254 SMO Round Bar Details 
Product Name254 SMO Round Bar
Material Grade254 SMO / 6Mo Stainless Steel
UNS DesignationUNS S31254
Werkstoff NumberW.Nr. 1.4547
EN DesignationX1CrNiMoCuN20-18-7
Material TypeSuper-Austenitic Stainless Steel
Chemical CompositionChromium 19.5–20.5%, Nickel 17.5–18.5%, Molybdenum 6.0–6.5%, Nitrogen 0.18–0.22%, Copper 0.5–1.0%, Carbon 0.02% max, Manganese 1.0% max, Silicon 0.08% max, Phosphorus 0.03% max, Sulfur 0.01% max
Manufacturing TypeHot Rolled / Cold Drawn / Forged / Ground
Round Bar StandardASTM A276 / ASME SA276
Bar StandardASTM A479 / ASME SA479
Forging StandardASTM A473 / applicable forging specification
European StandardEN 10088-3
DiameterAs per Standard / Customer Requirement
Diameter RangeApproximately 3 mm to 500 mm, depending on manufacturing capability
LengthStandard 1–6 m / Fixed or Customized Length
Toleranceh8, h9, h10, h11, h12 or as required
Surface FinishBlack / Bright / Peeled / Ground / Polished / Machined
Heat TreatmentSolution Annealed
ConditionAnnealed / Cold Drawn / Hot Rolled / Forged / Ground
MTCEN 10204 3.1 / 3.2
TestingChemical, Mechanical, Dimensional, Visual, Hardness, Intergranular Corrosion and NDT as specified
Tensile StrengthMinimum approximately 650 MPa
Yield StrengthMinimum approximately 300 MPa
ElongationMinimum approximately 35%
DensityApproximately 8.0 g/cm³
Melting RangeApproximately 1320–1390°C
Corrosion ResistanceExcellent resistance to pitting, crevice corrosion, general corrosion and stress-corrosion cracking
Chloride ResistanceExceptional resistance to chloride-bearing seawater and aggressive marine environments
PRE ValuePREN ≥ 42.5, depending on specified chemistry
WeldingGood weldability with suitable 254 SMO-compatible filler metals
Filler MetalERNiCrMo-10 / suitable 6Mo-compatible filler, as specified
Available FormRound Bar / Rod / Precision Ground Bar
CustomizationDiameter, Length, Tolerance, Finish, Heat Treatment, Testing and Documentation
OriginEuropean / American / Japanese / Korean and other approved origins
Export SupplyWorldwide Export Supply
Exporter SupportTechnical specification, inspection, certification, export packing and international shipment coordination
ApplicationsMarine, Seawater Handling, Chemical Processing, Petrochemical, Oil & Gas, Desalination, Flue Gas Desulfurization, Pulp & Paper, Pharmaceutical and Process Industries

 

254 SMO Round Bar – Standard Dimensions

Diameter (mm)Diameter (in.)Weight (kg/m)Weight (lb/ft)
50.1970.1570.105
60.2360.2360.159
80.3150.4020.270
100.3940.6280.422
120.4720.9050.608
140.5511.2320.828
160.6301.6081.081
180.7092.0361.368
200.7872.5131.689
220.8663.0382.042
250.9843.9272.638
281.1024.9253.310
301.1815.6553.800
321.2606.4344.323
361.4178.1425.471
401.57510.0536.758
451.77212.7238.553
501.96915.70810.557
562.20519.71513.249
632.48024.95716.767
712.79531.70021.303
803.15040.21227.018
903.54350.89334.200
1003.93762.83242.208
1104.33176.02651.075
1254.92198.17565.963
1505.906141.37294.969
1756.890192.423129.306
2007.874251.327168.864

 

254 SMO Round Bar – Inch / US Bar Sizes

US Bar SizeDiameter (in.)Diameter (mm)Approx. Weight (kg/m)
#20.2506.350.253
#30.3759.530.570
#40.50012.701.013
#50.62515.881.582
#60.75019.052.278
#70.87522.233.099
#81.00025.404.053
#91.12528.585.132
#101.25031.756.329
#111.37534.937.659
#121.50038.109.115
#131.62541.2810.691
#141.75044.4512.665
#151.87547.6314.250
#162.00050.8016.212
#182.25057.1520.515
#202.50063.5025.330

 

254 SMO Round Bar – Size & Tolerance Chart

Diameter RangeAvailable FinishTypical ToleranceSupply Condition
3–10 mmBright / Cold Drawn / Groundh8 / h9 / h10 / h11Solution Annealed
10–25 mmBright / Cold Drawn / Polishedh8 / h9 / h10 / h11Solution Annealed
25–50 mmCold Drawn / Peeled / Groundh9 / h10 / h11Solution Annealed
50–75 mmPeeled / Ground / Polishedh10 / h11Solution Annealed
75–100 mmPeeled / Machined / Groundh11Solution Annealed
100–150 mmHot Rolled / Peeled / Machinedh11 / Customer RequirementSolution Annealed
150–250 mmHot Rolled / Forged / MachinedCustomer RequirementSolution Annealed
250–350 mmForged / Rough MachinedCustomer RequirementSolution Annealed
350–500 mmForged / Custom MachinedCustomer RequirementSolution Annealed

 

Why Should You Buy From MetalX Nickel & Alloys
    • Distributor of Renowned Mills of Nickel Alloys in Europe and USA
    • Experience of 2 Decades as a Supplier of High Temperature Alloys in Dubai ( UAE), Saudi Arabia and Africa.
    • Largest Stockist of Nickel Alloy Flat Products in Mumbai
    • Ready Stock of Sheets, Coils, Strips and Bars in Over 50 Sizes at Al Jubail, Abu Dhabi, Muscat and South Africa
    • Facility of Cut to Size at No Extra Cost.
    • Weekly Delivery to Nigeria, Qatar, Dammam, Sharjah and Singapore
    • NACE Certified Material at Dealer Price.
    • Resale Price for Traders, Wholesalers, Importers and Stockholders in Mena Countries
    • Data Sheets and MTC Along With Quote.
    • Free Sample, Latest Price List on Request
    • Renowned Supplier in Heat Exchangers, Instrumentation, and Oil and Gas Industry
    • Compare Weight Chart and Price Per Kg in China and India.

Key Features of 254 SMO Sheets & Plates

  • Excellent Pitting Corrosion Resistance – 254 SMO provides exceptional resistance to localized pitting corrosion.
  • Excellent Crevice Corrosion Resistance – High molybdenum and nitrogen content contribute to strong resistance to crevice corrosion.
  • High Chloride Resistance – Particularly suitable for chloride-rich environments and seawater applications.
  • Excellent Resistance to Chloride Stress Corrosion Cracking – Provides strong resistance to chloride-induced stress corrosion cracking.
  • Superior Seawater Performance – Suitable for demanding seawater and marine environments.
  • High Molybdenum Content – Approximately 6.0–6.5% molybdenum supports enhanced localized corrosion resistance.
  • High Chromium Content – Approximately 19.5–20.5% chromium contributes to corrosion and oxidation resistance.
  • Low Carbon Content – Maximum carbon content of approximately 0.02% supports good resistance to sensitization.
  • Nitrogen Alloyed – Nitrogen contributes to strength and resistance to localized corrosion.
  • Excellent Acid Resistance – Suitable for selected acidic and aggressive chemical environments.
  • High Strength – Provides strong mechanical performance compared with conventional austenitic stainless steels.
  • Good Weldability – Can be welded using suitable procedures and qualified fabrication practices.
  • Good Fabrication Properties – Suitable for fabrication into industrial components and equipment.
  • Excellent Durability – Designed for demanding service environments with long operational life.
  • Wide Thickness Availability – Available from approximately 0.3 mm to 100 mm according to product requirements.
  • Large Width Availability – Widths can be supplied up to approximately 2500 mm where applicable.
  • Long Length Availability – Lengths can be supplied up to approximately 12000 mm according to requirements.
  • Multiple Surface Finishes – 2B, BA, hot rolled, cold rolled, polished and pickled finishes can be supplied.
  • Sheets, Plates & Coils – Available in multiple product forms and cut-to-size configurations.
  • Marine Applications – Suitable for seawater-handling equipment and marine systems.
  • Chemical Processing Applications – Used in selected aggressive chemical processing equipment.
  • Heat Exchanger Applications – Suitable for heat exchangers exposed to corrosive process fluids.
  • Pollution-Control Applications – Can be considered for selected environmental and pollution-control systems.
  • Offshore Applications – Useful for selected offshore equipment exposed to chloride-rich environments.
  • High-Pressure Applications – Suitable for selected high-pressure industrial equipment when the applicable design requirements are met.
  • Reliable Material Traceability – Material certificates and inspection documentation can be supplied according to order requirements.
  • Quality Testing Available – Chemical, mechanical, dimensional, hardness, visual and other specified inspections can be arranged.
  • Export-Ready Material – Sheets and plates can be suitably packed for handling, storage and international transportation.
  • Global 254 SMO Exporter – METALX NICKEL ALLOYS supplies 254 SMO Sheets & Plates to international buyers, distributors, traders, stockholders and industrial end users.
Specification254 SMO Sheets & Plates Details
Product Name254 SMO Sheets & Plates
Material Grade254 SMO
UNS DesignationS31254
EN Material Number1.4547
Material TypeHigh-Alloy Austenitic Stainless Steel
Applicable StandardASTM A240 / ASME SA240
Thickness Range0.3 mm to 100 mm
WidthUp to 2500 mm
LengthUp to 12000 mm
Product FormsSheets, Plates, Coils and Cut Sizes
Surface Finish2B, BA, Hot Rolled, Cold Rolled, Polished, Pickled
Chromium (Cr)19.5 – 20.5%
Nickel (Ni)17.5 – 18.5%
Molybdenum (Mo)6.0 – 6.5%
Nitrogen (N)0.18 – 0.22%
Carbon (C)Maximum 0.02%
Corrosion ResistanceExcellent resistance to pitting and crevice corrosion
Chloride ResistanceHigh resistance to chloride stress corrosion cracking
Seawater PerformanceExcellent resistance in seawater and chloride-rich environments
WeldabilityGood weldability and fabrication properties with suitable procedures
TestingChemical, mechanical, dimensional, hardness, visual and other specified tests
CustomizationThickness, width, length, finish, cut size, testing and documentation as required
PackingExport-worthy packing suitable for safe international transportation
ApplicationsMarine, seawater systems, chemical processing, pollution control, heat exchangers, offshore and industrial equipment
Export SupplyAvailable for international buyers, distributors, EPC contractors and industrial end users

 

1. What are 254 SMO Sheets & Plates?

254 SMO Sheets & Plates are manufactured from a highly alloyed austenitic stainless steel designed for excellent resistance to pitting, crevice corrosion and chloride-containing environments.

The UNS designation is S31254.

The EN material number is 1.4547.

A commonly applicable specification is ASTM A240 / ASME SA240.

Yes. 254 SMO is particularly valued for its excellent resistance to seawater, chlorides, pitting and crevice corrosion.

Yes. It provides high resistance to chloride stress corrosion cracking compared with many conventional stainless steel grades.

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