SMO 254 Pipes & Tubes Manufacturer & Supplier - USA Piping Solution

When your operating environment pushes standard materials beyond their limits, you need a proven solution. USA Piping Solution is your dedicated manufacturer and supplier for SMO 254 Pipes & Tubes (UNS S31254 / EN 1.4547), a high-performance alloy built to withstand severe conditions. Particularly effective against the corrosive attack of chlorides found in seawater, brackish water, and aggressive chemical streams, SMO 254 delivers where others fail. Our focus on quality, backed by significant inventory and deep technical understanding, establishes USA Piping Solution as the reliable partner for industries demanding robust, long-lasting piping infrastructure. Discover our extensive range of SMO 254 products, all engineered to meet rigorous global standards and elevate your operational reliability.

We recognize that selecting materials for tough corrosive challenges directly impacts safety, operational uptime, and overall lifecycle costs. This understanding drives our commitment to the quality of every 904L Stainless Steel Tubing product we offer. Available in both seamless (904L Seamless Pipe) and welded forms (904L Welded Tube), these products are engineered for superior performance. Whether you require standard dimensions shipped quickly from our inventory or need custom sizes or specific processing, USA Piping Solution is equipped to assist. Expect fully certified, premium UNS N08904 Pipe and tube, backed by our knowledgeable team and efficient global logistics.

What are SMO 254 Pipes & Tubes?

So, what exactly sets SMO 254 apart? Known formally by designations like UNS S31254 or EN 1.4547, SMO 254 is a highly engineered austenitic stainless steel. Its development was driven by the need for maximum durability in aggressive, corrosive settings. As part of the "super austenitic" family, it often carries the "6Mo" label, pointing directly to its critical molybdenum content, which sits around a substantial 6.1%. This high molybdenum level, combined with robust chromium (approx. 20%) and nitrogen (approx. 0.20%) content, grants SMO 254 Pipes & Tubes truly outstanding defense against localized corrosion like pitting and crevice attack. In this arena, it significantly outperforms common grades like 316L stainless steel and frequently surpasses even duplex stainless steels under specific challenging scenarios.

A key indicator of this capability is the Pitting Resistance Equivalent Number (PREN). Calculated using the formula PRE = %Cr + 3.3 x %Mo + 16 x %N, SMO 254 consistently achieves a PREN of 42.5 or higher, marking it as a top performer against chloride-induced corrosion. But its advantages extend further. SMO 254 also offers considerable mechanical strength—well above standard austenitic grades—while maintaining excellent ductility and the ability to absorb impacts, performing reliably even at frigid cryogenic temperatures. Critically, its very low carbon content minimizes the risk of harmful carbide precipitation during welding, which is vital for preserving corrosion resistance in the finished fabrication, particularly around welds. This compelling package of properties makes UNS S31254 Pipes and 6Mo Stainless Steel Tubes essential materials for demanding systems in marine engineering, chemical production, oil and gas, and other sectors where failure is not an option.

SMO 254 Pipes & Tubes Specifications

Clarity and adherence to established benchmarks are vital when specifying high-performance alloys. At USA Piping Solution, we ensure our SMO 254 Pipes & Tubes meet precise specifications and align with stringent international standards. This commitment translates into consistent material quality, dependable performance in the field, and the full traceability demanded by critical industries.

Technical Specifications

Specification Attribute	Details
Grade Identification	SMO 254, UNS S31254, EN 1.4547, W.Nr. 1.4547
Common Industry Names	254 SMO®, 6Mo Stainless Steel
Governing Standards	ASTM A312, A213, A269, A249, A358, A409, A182, A276, A479, A473
	ASME SA312, SA213, SA269, SA249
	EN 10216-5, EN 10088-3
	NACE MR0175 (Compliance for sour service applications)
	NORSOK MDS R11/R18, IOGP S-563 (Key offshore specifications)
Production Forms	Seamless Pipes & Tubes; Welded Pipes & Tubes (ERW, EFW methods available)
Typical Size Range (OD)	Seamless: Often 1/8" (3.17mm) up to 10" (273mm)
	Welded: Commonly 1/2" (12.7mm) through 48" (1219mm), larger on request
Wall Thickness Coverage	Encompasses Schedules 5S, 10S, 40S, 80S, plus heavier walls (XXS, custom)
	Specific wall thicknesses from fine gauge (e.g., 0.020"/0.5mm) to robust (e.g., 1.5"/38mm+)
Standard Lengths	Typically 6 meters (~20 ft) or 12 meters (~40 ft); Custom cutting services offered
End Finishes Available	Plain End (PE), Bevelled End (BE) for welding ease, Threaded End (TE)
Surface Condition Options	Annealed & Pickled (standard industrial), Bright Annealed (BA), Mill Finish, Various Polished grades (#4, #8, etc.)
Dimensional Tolerances	As defined by the relevant ASTM, ASME, or EN standard
Manufacturing Routes	Seamless: Via hot extrusion or cold drawing processes
	Welded: Utilizes Electric Resistance Welding (ERW) or Electric Fusion Welding (EFW)
Quality Verification	Includes Hydrostatic Testing, NDT (Eddy Current/Ultrasonic), Chemical Analysis (PMI), Mechanical Property Tests (Tensile, Hardness), Intergranular Corrosion Test (if specified)

Note: Inventory for specific sizes fluctuates. Please contact USA Piping Solution directly to confirm availability for your project requirements.

Chemical Composition and Mechanical Properties

The impressive capabilities of Alloy 254 Pipes trace directly back to a tightly controlled chemical balance and the resulting robust mechanical characteristics.

Chemical Composition (Typical)

Understanding the contribution of each key element in SMO 254 (UNS S31254) illuminates its performance advantages:

Element	Symbol	Content (% by Weight)	Role in Performance
Carbon	C	≤ 0.020	Vital low level prevents issues like weld decay, preserving corrosion integrity.
Silicon	Si	≤ 0.80	Primarily aids during the melting process (deoxidation); minor strength boost.
Manganese	Mn	≤ 1.00	Improves the material's response to hot working and contributes to strength.
Phosphorus	P	≤ 0.030	Kept low as excess can lead to embrittlement.
Sulfur	S	≤ 0.010	Minimized to maximize corrosion resistance and ensure good weldability.
Chromium	Cr	19.5 - 20.5	Forms the fundamental passive oxide layer that shields the steel.
Nickel	Ni	17.5 - 18.5	Stabilizes the tough austenitic structure and enhances general corrosion defense.
Molybdenum	Mo	6.0 - 6.5	The critical addition for fighting localized pitting and crevice corrosion from chlorides.
Nitrogen	N	0.18 - 0.22	Significantly boosts pitting resistance (PREN) alongside Cr & Mo, and increases strength.
Copper	Cu	0.50 - 1.00	Adds an edge in resisting certain acids, particularly sulfuric acid.
Iron	Fe	Balance	The primary structural element, forming the base austenitic matrix.

Note: These values represent typical ranges under common specifications. Actual heat chemistry will conform to the specific standard's defined limits.

Mechanical Properties

This carefully engineered chemistry yields a desirable combination of strength, ductility, and toughness, making ASTM A312 SMO 254 Seamless Pipes highly suitable for pressure-bearing and structural roles.

Property	Metric Units (Typical at 20°C / Room Temp)	Imperial Units (Typical at 68°F / Room Temp)	What It Means for Performance
Tensile Strength (Rm)	650 - 850 MPa	94 - 123 ksi	The maximum load the material can sustain before fracture when pulled.
Yield Strength (Rp0.2)	≥ 300 MPa	≥ 43.5 ksi	The stress point where permanent (plastic) deformation begins.
Elongation (A)	≥ 35 %	≥ 35 %	Indicates good ductility – its ability to stretch or bend without breaking.
Hardness	≤ 96 HRB / Approx. 217 HB	≤ 96 HRB / Approx. 217 HB	Resistance to surface indentation or scratching.
Density	8.0 g/cm³	0.29 lb/in³	Typical density for this class of high-alloy stainless steel.
Melting Range	1320 - 1390 °C	2410 - 2530 °F	The temperature span over which the material transitions from solid to liquid.
Impact Strength (Charpy V)	Excellent; Maintains toughness well into cryogenic temperatures (-196°C / -320°F)	Resists brittle fracture upon sudden loading	Its ability to absorb energy during impact, crucial for safety and reliability.
Modulus of Elasticity	195 GPa	28.3 x 10³ ksi	A measure of stiffness – its resistance to elastic deformation under load.

Note: These properties are characteristic of the solution annealed condition. Actual test results can vary slightly based on product size, form, and the precise requirements of the governing standard.

Types and Variations of SMO 254 Pipes & Tubes

Recognizing that projects vary, USA Piping Solution provides SMO 254 Pipes & Tubes in the primary forms needed by industry:

1. Seamless SMO 254 Pipes & Tubes:
• Produced from solid billets, pierced and drawn without any weld seam.
• This process results in a uniform material structure, inherently strong and well-suited for high-pressure containment. Dimensional accuracy is also a key benefit.
• Seamless is often the specification of choice for the most demanding services – think extreme pressures, high heat, or highly corrosive fluids where eliminating a weld is preferred.
• Commonly made to specifications like ASTM A312 (pipe) and ASTM A213 (tube).
2. Welded SMO 254 Pipes & Tubes:
• These start as flat-rolled material (strip or plate), which is formed into a cylinder and the edges joined by a longitudinal weld, typically using ERW or EFW techniques.
• Welded construction generally offers cost advantages, particularly as pipe diameters increase.
• With modern manufacturing controls, the weld seam integrity and corrosion resistance are excellent, often closely matching the base material when proper procedures and post-weld heat treatment (if required) are applied.
• A versatile and widely used option for countless structural applications and fluid conveyance systems.
• Key standards include ASTM A312, A249 (welded tube), and A358 (EFW pipe).
3. Available Shapes:
• Round Pipes & Tubes: The most common profile for fluid transport and many structural elements.
• Square & Rectangular Tubes: Used for constructing frameworks, in architectural designs, and certain equipment where flat mounting surfaces or specific geometries are beneficial.
4. Surface Finish Choices:
• Annealed & Pickled (A&P): The standard industrial finish, offering a clean, descaled matte surface ready for service.
• Bright Annealed (BA): Results from heat treatment in a controlled atmosphere, producing a bright, reflective finish without pickling acids. Often chosen for visual appeal or sanitary needs.
• Polished Finishes: Mechanical polishing creates smoother, more reflective surfaces (e.g., #4 satin brush, #8 mirror). Common in architectural, food/pharma, or decorative applications.

Applications and Industries Served

The powerful combination of exceptional corrosion defense and reliable mechanical strength makes SMO 254 Pipes & Tubes critical components across industries facing tough conditions:

• Marine & Offshore: Indispensable for seawater handling systems (cooling, heat exchangers, ballast water treatment, fire mains), piping on offshore structures, and vital hydraulic/instrumentation lines battered by salt spray. Its resistance to chloride pitting and crevice corrosion is paramount.
• Chemical Processing: Reliably handles highly corrosive chemicals, particularly those containing chlorides, bromides, or challenging acid mixtures. Finds use in reactors, heat exchangers, storage tanks, scrubbers, and process piping throughout plants.
• Oil & Gas: Crucial for upstream and downstream operations dealing with sour gas (H₂S), high-chloride formation waters, and elevated pressures in downhole tools, process piping, subsea equipment, and topside facilities. Meets NACE MR0175 sour service standards.
• Pulp & Paper: Especially valuable in bleach plants resisting aggressive chemicals like chlorine dioxide. Used in washers, vats, press rolls, and piping within the bleaching circuit.
• Desalination: A workhorse material for components like heat exchanger tubing, high-pressure piping in reverse osmosis systems, and intake/discharge lines constantly exposed to seawater and concentrated brines.
• Power Generation: Commonly employed in Flue Gas Desulfurization (FGD) systems at power plants to combat acidic, chloride-containing flue gases. Also effective as condenser tubing in coastal plants using seawater cooling.
• Pharmaceuticals & Biotechnology: Specified for high-purity piping where resistance to aggressive cleaning agents or saline process streams is needed without compromising product integrity.
• Mining & Metals Processing: Suitable for demanding leaching circuits and solvent extraction processes involving acidic, chloride-rich solutions.

SMO 254 Pipes & Tubes Size Chart

USA Piping Solution aims to provide the SMO 254 Pipe and Tube sizes you need. Below is a representative overview of common Outside Diameters (OD) and Wall Thicknesses (WT). Refer to ANSI B36.19 and B36.10 for detailed pipe schedule dimensions.

Wall Thickness (inches)	Example ODs Frequently Stocked (inches)
0.020"	1/16", 1/8", 3/16", 1/4", 5/16", 3/8"
0.028"	1/8", 3/16", 1/4", 5/16", 3/8", 1/2", 3/4", 1"
0.035"	1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", 7/8", 1", 1-1/4", 1-1/2"
0.049"	3/16", 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/4", 1-1/2", 2"
0.065" (cf. Sch 5S/10S)	1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3"
0.083" (cf. Sch 10S)	1/4", 3/8", 1/2", 5/8", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 3-1/2", 4"
0.109" (cf. Sch 10S/40S)	1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 4", 5", 6", 8"
0.120"	1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 3-1/2", 4"
Common Sch 40S WTs	0.154" (2"), 0.203" (2.5"), 0.216" (3"), 0.237" (4"), 0.258" (5"), 0.280" (6"), 0.322" (8")
Common Sch 40/STD WTs	0.365" (10"), 0.375" (12" - 24")
Common Sch 80S/XS WTs	0.500" (8" - 24")
Heavier Walls	We supply material in Sch 80S, 160, XXS, and specific non-schedule heavy walls. Please inquire about availability for your required dimensions.

This table is intended as a general guide. USA Piping Solution works diligently to stock and source materials across all major schedules and specific wall requirements. Let us know what you need.

Certifications and Compliance Standards

With high-performance alloys, verifiable quality and clear traceability aren't optional – they're essential. USA Piping Solution ensures this through rigorous documentation and adherence to globally recognized standards for every SMO 254 Pipe & Tube order:

• Material Test Reports (MTRs): You will receive Mill Test Certificates (MTCs) fully compliant with EN 10204 3.1. These comprehensive reports detail the specific heat's chemical analysis, verified mechanical test results (tensile, yield, elongation, hardness), heat treatment confirmation, and outcomes of all required testing. This provides undeniable traceability from the finished product back to its origin. If needed, we can coordinate EN 10204 3.2 certification, involving validation by an independent inspection authority.
• ASTM / ASME Standard Conformance: Our inventory strictly meets the requirements laid out in key ASTM and ASME standards, such as A312/SA312 (seamless/welded pipe), A213/SA213 (seamless tube), A269/SA269 (general service tube), and A249/SA249 (welded tube). This ensures compliance regarding dimensions, material integrity, and expected performance benchmarks.
• NACE MR0175 / ISO 15156 Capability: For oil and gas projects operating in sour service conditions where H₂S is present, we supply SMO 254 certified to meet the demanding criteria of NACE MR0175 / ISO 15156.
• Third-Party Inspection (TPI) Ready: We routinely work with and facilitate inspections by respected third-party agencies (like Lloyds, DNV, BV, SGS, TÜV) as dictated by your project specifications or purchase orders.
• Quality Management System: USA Piping Solution operates under a robust quality management framework, incorporating principles aligned with ISO 9001. This systematic approach ensures consistent product quality, reliable processes, and your complete satisfaction.

Why Choose USA Piping Solution for SMO 254 Pipes & Tubes?

Selecting the right supplier for advanced materials like SMO 254 is a critical decision impacting project timelines, budgets, and long-term operational success. Partnering with USA Piping Solution delivers distinct advantages:

• Benefit from Specialized Knowledge: We offer more than just stock; we provide insight. Our team possesses extensive technical understanding of SMO 254 Pipes & Tubes and their real-world performance. We can help you navigate specifications and select the optimal choice for your specific challenge.
• Accelerate Your Project with Inventory: Our substantial stock of UNS S31254 Pipes and 6Mo Stainless Steel Tubes in common sizes and forms often means significantly faster delivery than waiting for mill production runs, keeping your project on track.
• Count on Verified Quality: Through meticulous QC procedures, strict adherence to global standards, and transparent MTR documentation, you gain confidence that the Alloy 254 Pipe you receive meets the highest quality and reliability standards.
• Secure a Reliable Supply: We've built strong, lasting relationships with leading mills known for producing top-tier SMO 254, giving you access to a dependable and consistent supply chain.
• Solutions Beyond the Standard: Need precise lengths, special finishes, or a dimension that's hard to find? We offer value-added services like cutting and can leverage our network to source non-standard requirements.
• Competitive Value Proposition: Our market understanding and efficient operations allow us to offer fair and competitive pricing on these premium alloys, ensuring you receive excellent value without compromising on material integrity.
• Experience Responsive Partnership: Expect prompt, knowledgeable communication from our team. We are committed to providing timely quotes, clear answers to your technical questions, and ensuring a seamless experience from your initial inquiry to final delivery.

Related Products

Our expertise extends beyond SMO 254. USA Piping Solution is also your source for a comprehensive range of other high-performance and corrosion-resistant piping materials. Consider us for:

Final Call to Action

When facing down aggressive corrosion, don't settle for less than proven performance. Equip your critical systems with the reliability of SMO 254 Pipes & Tubes from USA Piping Solution. Contact our experienced team today. We're ready to discuss your specific needs for UNS S31254 Pipes, 6Mo Stainless Steel Tubes, or ASTM A312 SMO 254 Seamless Pipes, provide insightful technical support, generate accurate quotations, and ensure you receive the premium materials vital for your project's success.

Partner with USA Piping Solution for dependable, high-performance SMO 254 piping solutions, delivered with expertise and efficiency.

Request Your SMO 254 Pipe Quote Today!