SMO 254 Plates & Sheets Supplier USA

In demanding industrial settings where ordinary stainless steels reach their limits, you need materials engineered for resilience. USA Piping Solution stands as a premier manufacturer and supplier of SMO 254 Plates & Sheets, a superior choice designed to perform reliably under profoundly corrosive conditions. Officially known as UNS S31254, this super austenitic stainless steel, often called a "6Mo" alloy due to its high molybdenum content, provides exceptional durability. Industries facing tough challenges – think chemical processing, offshore platforms, marine environments, and desalination facilities – rely on SMO 254. We provide not only a deep inventory of SMO 254 Plates & Sheets but also the technical insight to ensure your projects benefit from the right material specification.

What are SMO 254 Plates & Sheets?

So, what exactly sets SMO 254 (UNS S31254 / W.Nr. 1.4547) apart? It's a high-alloy member of the super austenitic stainless steel family. Its carefully controlled chemistry is the key: generous amounts of chromium (around 20%) and nickel (about 18%), a significant portion of molybdenum (6% or more), and an important addition of nitrogen (roughly 0.2%). This formulation elevates its performance well beyond standard grades like 316L, particularly when battling aggressive substances like chlorides, acids, and harsh process chemicals.

The "6Mo" designation highlights that substantial molybdenum level. Why is that important? Molybdenum is the powerhouse element providing remarkable resistance to localized corrosion, specifically pitting and crevice corrosion. These are common failure modes for less capable alloys immersed in chloride-containing fluids, like seawater. The nitrogen content works in tandem with molybdenum, further boosting pitting resistance (quantified by a high Pitting Resistance Equivalent Number, PREN, typically hitting 42.5 or more). Nitrogen also contributes significantly to the material's strength – both yield and tensile – without sacrificing the toughness inherent to its austenitic structure.

SMO 254 was developed to bridge a performance gap, offering a step up from conventional stainless steels without the full cost jump to nickel-based alloys. It presents a practical, effective solution where top-tier corrosion resistance must pair with reasonable fabricability and weldability. Its austenitic nature ensures good ductility and toughness, properties it maintains even at very low temperatures. Furthermore, its increased strength can allow for designs using thinner material sections, potentially saving weight and cost compared to standard austenitic grades. This combination makes UNS S31254 Plates and sheets highly valued for long-term reliability in severe service environments.

SMO 254 Plates & Sheets Specifications

Ensuring SMO 254 meets the precise demands of your application starts with understanding its technical specifications. At USA Piping Solution, we supply materials that align with rigorous global standards.

Technical Specifications

Our SMO 254 Plates & Sheets generally adhere to the following specifications. However, we understand unique project needs arise, so don't hesitate to discuss custom requirements with us:

Primary Standard: You'll typically find our material certified to ASTM A240 / ASME SA240. This is the foundational specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip used in pressure vessels and general applications, making it critical for ASTM A240 SMO 254 Plate.
Grade Identification: SMO 254 / UNS S31254 / EN 1.4547
Thickness Dimensions:

Sheet (Usually Cold Rolled - CR): Ranging from thin gauges like 0.5mm (approx. 0.020") up to 6.35mm (approx. 0.250").
Plate (Usually Hot Rolled - HR): Typically starting from 4.0mm (approx. 0.157") and extending to 100mm (approx. 4"), sometimes thicker depending on mill capabilities.

Widths Available: Common stock widths include 1000mm (39.37"), 1219mm (48"), 1500mm (59.05"), and 2000mm (78.74"). We can often source or process non-standard widths if needed.
Lengths Available: Standard lengths often stocked are 2000mm (78.74"), 2440mm (96"), 3000mm (118.11"), and 6000mm (236.22"). Custom lengths are readily available through cutting services, while coils provide continuous length.
Surface Finish Options: The appearance and texture can vary. Common finishes include:

No. 1 (HRAP): The standard finish for hot-rolled plate – dull, slightly rough.
2B: The most widely used cold-rolled finish – smooth, moderately reflective.
2D: A less reflective cold-rolled finish, often chosen when further forming is planned.
BA (Bright Annealed): A highly reflective, mirror-like finish achieved through controlled atmosphere annealing.
No. 4 (Brushed/Satin): A popular polished finish with a distinct directional grain.
No. 8 (Mirror): The most reflective finish, achieved through extensive polishing.
Other possibilities include Chequered (tread plate for grip), Perforated sheets, or patterned Embossed finishes.

Forms We Supply: Look to us for SMO 254 in various forms: Coils, thin Foils, continuous Rolls, standard Plain Sheet, ultra-thin Shim Sheet, Perforated Sheet, slip-resistant Chequered Plate, narrow Strip, Flat bars, precisely cut Blanks (like Circles), and Rings (often used for making flanges).

Chemical Composition and Mechanical Properties

The remarkable characteristics of SMO 254 are a direct result of its specific chemical balance and the mechanical strength it achieves. Understanding these is vital for matching the material to the right operating conditions.

Chemical Composition (Typical)

The table below details the typical target ranges for the elements in SMO 254 (UNS S31254), as defined by ASTM A240. While slight variations between production batches (heats) are normal, all material conforms strictly to the standard's required limits.

Element	Symbol	Target Content (%)	Role in Performance
Carbon	C	0.020 max	Keeping carbon low prevents issues during welding that could impair corrosion resistance.
Manganese	Mn	1.00 max	Aids in shaping the material at high temperatures (hot workability).
Silicon	Si	0.80 max	Used during steelmaking; provides some resistance to high-temp scaling.
Phosphorus	P	0.030 max	Considered an impurity; levels are tightly controlled.
Sulfur	S	0.010 max	Another impurity; minimizing sulfur improves corrosion resistance and welding.
Chromium	Cr	19.5 - 20.5	The cornerstone element providing fundamental corrosion and oxidation defense.
Nickel	Ni	17.5 - 18.5	Stabilizes the tough austenitic structure; boosts resistance to many acids.
Molybdenum	Mo	6.0 - 6.5	This is the key player resisting pitting and crevice attack, particularly in chloride environments.
Nitrogen	N	0.18 - 0.22	Works with Moly to fight pitting (high PREN); also adds strength and stability.
Copper	Cu	0.50 - 1.00	Offers improved resistance against specific acids, notably sulfuric acid.
Iron	Fe	Balance	The base metal forming the steel's fundamental austenitic matrix.

Regarding PREN (Pitting Resistance Equivalent Number): Calculated using the formula %Cr + 3.3 * %Mo + 16 * %N, a PREN of 42.5 or higher for SMO 254 signifies its outstanding resistance to pitting corrosion.

Mechanical Properties

Beyond its corrosion prowess, SMO 254 delivers mechanical properties noticeably higher than standard austenitic grades like 316L. This increased strength can be leveraged in design. Here are the typical minimum mechanical properties expected at room temperature per ASTM A240:

Property	Value (Metric)	Value (Imperial)	What This Tells You
Tensile Strength (UTS)	650 MPa (min)	94 ksi (min)	The ultimate pulling stress the material can withstand before failure.
Yield Strength (0.2% Offset)	300 MPa (min)	44 ksi (min)	The stress level where the material begins to deform permanently. Higher yield strength often allows for more efficient designs.
Elongation (% in 50mm/2in)	35% (min)	35% (min)	A measure of ductility – how much it can stretch before breaking.
Hardness (Brinell)	220 HBW (typical max)	-	Indicates resistance to indentation (Rockwell B is also commonly used).
Hardness (Rockwell B)	96 HRB (typical max)	96 HRB (typical max)	An alternative hardness measurement method often cited in standards.

Keep in mind: Actual properties can be influenced by the product's thickness, processing history, and the temperature during testing or service. The Material Test Certificate (MTC) provides the specific, verified values for your batch.

Types and Variations of SMO 254 Plates & Sheets

To support diverse fabrication methods and end uses, USA Piping Solution supplies SMO 254 (UNS S31254) across a spectrum of product forms:

SMO 254 Plates: Generally refers to flat material 4.76mm (3/16 inch) thick or heavier. These UNS S31254 Plates are typically hot-rolled (HR) and supplied with a standard No. 1 finish. Plates form the backbone of heavy-duty equipment like pressure vessels, robust tanks, structural members in corrosive zones, components for flue gas desulfurization units, and substantial tube sheets for heat exchangers. Their thickness lends structural rigidity.
SMO 254 Sheets: Covers the thinner flat-rolled material, usually below 4.76mm. SMO 254 Sheet is often cold-rolled (CR), yielding tighter thickness tolerances and smoother finishes like the versatile 2B. Sheets find use where excellent corrosion resistance is paramount but structural mass is less critical – applications include tank linings, vessel cladding, lighter fabrications, ducting systems, equipment housings, and certain heat exchanger elements. Alloy 254 Sheets provide fabrication flexibility.
SMO 254 Coils: Essentially, a long, continuous strip of sheet material wound into a large roll. Coils are highly efficient for manufacturers employing automated processes like stamping, roll forming, or continuous cutting lines, serving as the input material for cut-to-length sheets or narrower strips.
SMO 254 Shim Sheet: Very thin sheets, often down to foil thicknesses. These are used for creating precise alignment, filling tiny gaps (shimming), or forming specialized seals in critical assemblies where corrosion resistance cannot be compromised.
SMO 254 Strip: Narrower widths of material, usually slit from wider coils to meet specific dimensions. Strip is the starting point for products like welded tubing, custom-made gaskets, or other specialized formed components.
SMO 254 Chequered Plate (Tread Plate): Plate featuring a raised, repeating pattern (like diamonds or teardrops) rolled onto one surface. This texture dramatically improves grip, making it ideal for flooring, ramps, walkways, and platforms in industrial or marine areas where slips are a concern and corrosion is present.
SMO 254 Perforated Sheet: Standard sheet material that has had holes punched through it in various patterns and sizes. Applications range from filtration and screening media to protective guards, ventilation covers, architectural features, and even acoustic panels, anywhere combining corrosion resistance with permeability is necessary.
SMO 254 Circles / Blanks / Rings: Custom shapes precisely cut from either plate or sheet stock. These serve as intermediate forms, ready for further machining or fabrication into items like pipe flanges, vessel end caps, smaller tube sheets, or other bespoke parts.

Applications and Industries Served

The potent combination of extreme corrosion resistance (especially against chlorides), elevated strength, and dependable fabricability makes SMO 254 Plates & Sheets a vital material across several demanding sectors:

Offshore Oil & Gas: Indispensable for handling corrosive seawater in systems for cooling, water injection, and ballast. Used in process piping, structural components on platforms, subsea hardware, and heat exchangers exposed to harsh seawater and process fluids. Its resistance to localized corrosion is paramount.
Desalination Plants: A cornerstone material for equipment constantly battling hot, concentrated chloride solutions. Found in evaporators, brine heaters, pumps, piping networks, and tubing within Multi-Stage Flash (MSF), Multi-Effect Distillation (MED), and Reverse Osmosis (RO) facilities.
Chemical Processing: Well-suited for handling aggressive chemicals, including specific concentrations of phosphoric and sulfuric acids, and various chloride-containing process streams. Utilized in reactors, storage tanks, piping, heat exchangers, and emission control scrubbers.
Pulp and Paper Industry: Equipment within bleach plants (washers, vats, press rolls, pipelines) benefits greatly from SMO 254's ability to withstand highly corrosive bleaching chemicals like chlorine dioxide. It has become a standard upgrade from lower-grade stainless steels in many critical bleaching applications.
Marine Engineering: Chosen for shipbuilding components that demand superior resistance to saltwater corrosion. This includes seawater cooling pipework, exhaust gas scrubbers designed to meet environmental regulations, and structural elements constantly exposed to the marine atmosphere. 6Mo Plates offer a significant performance advantage over 316L in these settings.
Power Generation: A key material in Flue Gas Desulfurization (FGD) systems at power plants, especially within absorbers, ductwork, and stack liners where acidic condensation and chlorides pose major corrosion challenges. Also selected for high-reliability condenser tubing in coastal power stations using seawater cooling.
Pharmaceutical and Food Processing: While standard stainless grades are more common, SMO 254 is specified when processes involve exceptionally harsh cleaning agents or aggressive product chemistries where its superior resistance becomes necessary.
Pollution Control: Employed in equipment built to safely handle and treat corrosive industrial effluents and challenging waste streams.

SMO 254 Plates & Sheets Size Chart

USA Piping Solution works to maintain a ready supply of SMO 254 Plates & Sheets in common dimensions. This table offers a general overview, but we encourage you to contact us for real-time availability and to discuss any custom size requirements.

Form	Thickness Range (Metric)	Thickness Range (Imperial, approx.)	Standard Widths (Metric)	Standard Lengths (Metric)
Sheet (Cold Rolled)	0.5mm - 6.35mm	0.020" - 0.250"	1000mm, 1219mm, 1500mm	2000mm, 2440mm, 3000mm, Coil
Plate (Hot Rolled)	4.0mm - 100mm+	0.157" - 4.0"+	1219mm, 1500mm, 2000mm, 2500mm+	2440mm, 3000mm, 6000mm, Custom Cut
Coil	0.5mm - 6.35mm	0.020" - 0.250"	1000mm, 1219mm, 1500mm	Continuous
Strip / Shim / Foil	< 0.5mm up to 6.35mm	< 0.020" up to 0.250"	Slit precisely to width	Coil or Specific Cut Lengths
Chequered Plate	3.0mm - 10mm (base thickness)	1/8" - 3/8" (base thickness)	1219mm, 1500mm	2440mm, 3000mm, 6000mm
Perforated Sheet	Depends on base sheet	Depends on base sheet	Standard sheet widths	Standard sheet lengths
Circles / Blanks	Cut from stock plate/sheet	Cut from stock plate/sheet	Custom Diameter specified	N/A

Points to consider:

Inventory fluctuates; please confirm current stock levels with our sales team. Special orders for non-standard dimensions may involve minimum quantities or lead times.
Need exact sizes? Our processing services include precision plasma, laser, and waterjet cutting.
Thickness tolerances differ between hot-rolled plate and cold-rolled sheet products.

Certifications and Compliance Standards

At USA Piping Solution, ensuring quality and complete traceability is fundamental. All SMO 254 Plates & Sheets originate from carefully vetted, reputable mills and arrive with exhaustive documentation confirming compliance with recognized industry standards.

Governing Manufacturing Standard: All material is produced and certified to meet or exceed the stipulations of ASTM A240 / ASME SA240.
Material Test Certificates (MTC): Every shipment includes an MTC conforming to EN 10204 3.1. This essential document provides the specific heat number, a detailed chemical analysis breakdown, verified mechanical test results (tensile, yield, elongation, hardness), and explicit confirmation of compliance with the ordered standard.
Third-Party Verification (Optional): For projects demanding the highest level of assurance, we can facilitate EN 10204 3.2 certification. This involves inspection and verification by an accredited independent third-party agency.
Comprehensive Mill Testing: We mandate rigorous testing programs at the producing mills, typically encompassing:

Precise Chemical Analysis (often via Spectrometry)
Thorough Mechanical Testing (Tensile, Yield Strength, Elongation at ambient temperature)
Hardness Verification (Brinell or Rockwell methods)
Specific Corrosion Testing (like Pitting Resistance via ASTM G48 or Intergranular Corrosion susceptibility via ASTM A262) can be conducted upon request, if specified in your purchase order.
Positive Material Identification (PMI) testing can be performed either by us or a third party to confirm alloy identity.

NACE Compliance for Sour Service: If your application falls under NACE MR0175 / ISO 15156 requirements (for environments containing wet H2S, common in oil and gas), SMO 254 material can often be supplied accordingly. Please clearly state this requirement when ordering, as specific conditions may apply.
Unbroken Traceability: From the moment it's produced at the mill until it reaches you, every piece is tracked using unique heat numbers. These are physically marked on the material and meticulously recorded on the MTC, ensuring full material history.

Why Choose USA Piping Solution for SMO 254 Plates & Sheets?

When you select USA Piping Solution for your SMO 254 Plates & Sheets, you gain several key advantages that contribute directly to your project's success:

Focused Inventory, Faster Access: We concentrate on maintaining a robust stock of SMO 254 (UNS S31254) across various plates, sheets, and coils. This often translates to quicker availability, helping you meet demanding timelines.
Unwavering Commitment to Quality: Quality is non-negotiable. By sourcing exclusively from pre-qualified, globally respected mills and providing complete, verifiable certifications, we ensure the material you receive strictly adheres to ASTM/ASME standards.
Deep Technical Knowledge: Our team possesses extensive experience with super austenitic stainless steels like SMO 254. We're here to offer practical advice on material selection, fabrication techniques, and suitability for your specific operational challenges.
Tailored Processing Capabilities: Need something beyond off-the-shelf sizes? We provide valuable processing services, including high-precision cutting (plasma, laser, waterjet), shearing, and even surface conditioning like polishing, delivering material closer to your final requirements.
Reliable Nationwide Delivery: Our streamlined warehousing and established logistics network ensure your 6Mo Plates and sheets are delivered dependably and efficiently, wherever your project is located in the USA.
Competitive Sourcing Strategy: Thanks to strong, long-term relationships with our supplying mills, we consistently strive to offer competitive pricing on these high-performance Alloy 254 Sheets and plates, providing excellent value without cutting corners on quality.
A Partnership Approach: We prioritize understanding your specific project needs and operational constraints. Our goal is to collaborate with you, providing not just metal, but the optimal material solutions and ongoing support required for your critical applications.

Final Call to Action

For demanding applications in chemical processing, marine services, offshore exploration, or desalination that require the superior performance of SMO 254 Plates & Sheets, look no further than USA Piping Solution. Our dedication to quality, backed by extensive inventory and technical expertise, ensures you receive materials engineered for reliability and longevity.

Contact our team today. Let us provide you with a detailed quote, confirm current stock availability for UNS S31254 Plates or SMO 254 Sheet, discuss your project's specific needs, or offer expert material consultation. Make USA Piping Solution your trusted partner for success in your most critical ventures.

Request Your SMO 254 Plates & Sheets Quote Today!

SMO 254 Plates & Sheets Manufacturer & Supplier - USA Piping Solution

What are SMO 254 Plates & Sheets?