409 Stainless Steel Pipe - ASTM A268/A249 Welded & Seamless Tubing

Kuaima Steel Co., Ltd.

Verified Custom manufacturer · 7 yrs ·

China

Customizable Rock-bottom price

$1380 1-49 ton Base price

$1320 50-99 ton 4.3% off

$1290 ≥100 ton 6.5% off

Price validity: subject to market conditions

Supplier's customization ability

Drawing-based customization
Sample-based customization
Full customization

Quantity

Minimum order quantity: 1 ton

Shipping total: To be negotiated

Subtotal of goods US$ 1,380.00

Start order request

Payment and delivery

Payment:: by contract — deposit, balance after your inspection
Lead time:: confirmed with the quotation
Packaging:: standard export packing
Samples:: available on request

Product details

Technical Specifications of 409 Stainless Steel Pipe

Property	Parameter	Description
Product Name	409 Stainless Steel Pipe	Ferritic stainless steel pipe for automotive and industrial applications
Material Grade	AISI 409 / EN 1.4512 / UNS S40900	International grade equivalents
Standard Compliance	ASTM A268, ASTM A240, EN 10088-2	Meets major international standards
Carbon (C)	≤0.08%	Low carbon content for weldability
Chromium (Cr)	10.5-11.75%	Provides basic corrosion resistance
Manganese (Mn)	≤1.0%	Improves strength and hardenability
Silicon (Si)	≤1.0%	Deoxidizer and strengthener
Titanium (Ti)	6×(C+N) min - 0.75% max	Stabilizer to prevent intergranular corrosion
Tensile Strength	≥380 MPa	Minimum tensile strength per ASTM A268
Yield Strength	≥205 MPa	Minimum yield strength
Elongation	≥20%	Ductility in 50mm gauge length
OD Range	6mm - 630mm	Available outer diameter options
Wall Thickness	0.5mm - 25mm	Standard and custom thickness
Length	6m - 12m or custom	Standard and custom lengths
Surface Finish	Annealed, Pickled, Polished	Multiple surface treatment options
Application	Automotive exhaust systems, heat exchangers, industrial equipment	Typical application industries
Heat Resistance	Up to 815°C	Maximum continuous service temperature
Certification	EN 10204 3.1, ISO 9001, ASTM	Quality certifications provided
Packaging	Bundled with steel strips, plastic caps, wooden crates	Standard export packaging
MOQ	5 tons	Minimum order quantity

409 Stainless Steel Pipe - ASTM A268/A249 Welded & Seamless Tubing

409 stainless steel pipe represents a ferritic chromium alloy specifically engineered for high-temperature exhaust systems and structural applications requiring superior oxidation resistance. This cost-effective material finds extensive application in automotive exhaust components, catalytic converter housings, and industrial heat exchanger systems where temperatures reach 815°C (1500°F). Manufactured to comply with ASTM A268 for seamless and welded ferritic tubing and ASTM A249 for boiler applications, our 409 stainless steel pipe delivers exceptional value-driven pricing while maintaining robust structural integrity in demanding thermal environments.

What is 409 Stainless Steel Pipe?

409 stainless steel pipe is a ferritic chromium-based alloy containing 10.5-11.75% chromium with titanium stabilization, specifically designed for applications requiring oxidation resistance at elevated temperatures up to 815°C. Unlike austenitic grades, this ferritic structure exhibits magnetic properties and thermal expansion characteristics similar to carbon steel, making it the preferred choice for automotive exhaust systems, mufflers, and catalytic converter assemblies. The titanium addition (6x carbon content minimum) prevents carbide precipitation during welding, ensuring excellent weld performance without intergranular corrosion concerns in heat-affected zones.

409 Stainless Steel Pipe Technical Specifications

Our 409 stainless steel pipe is manufactured according to ASTM A268/A268M-19 for ferritic and martensitic stainless steel tubing and ASTM A249/A249M-18 for boiler, superheater, and heat exchanger applications. Chemical composition meets stringent requirements with chromium content of 10.50-11.75%, carbon limited to 0.08% maximum, and titanium stabilization at 6×(C+N) minimum to 0.75% maximum per ASTM A240 Section 6. Mechanical properties include minimum tensile strength of 380 MPa (55 ksi) and yield strength of 205 MPa (30 ksi) at room temperature, with elongation of 20% minimum in 50mm gauge length.

Manufacturing Standards and Quality Certifications

Every 409 stainless steel pipe undergoes rigorous quality control conforming to multiple international standards including ASTM A268-19, EN 10217-7:2014 for welded tubes, and JIS G3463 for boiler and heat exchanger applications. Our manufacturing facility maintains ISO 9001:2015 certification with full traceability documentation including mill test certificates (MTC 3.1 per EN 10204), chemical composition analysis via optical emission spectrometry, and mechanical property verification through tensile testing per ASTM E8/E8M.

Dimensional Range and Tolerances

Available in outer diameters from 6.35mm (1/4") to 914mm (36") with wall thickness ranging from 0.5mm to 50mm, our 409 stainless steel pipe meets dimensional tolerances specified in ASTM A999/A999M for general requirements. Standard lengths include random lengths of 6-12 meters, with custom cutting services available for specific project requirements maintaining straightness tolerance of 3mm per meter maximum.

Key Advantages of 409 Stainless Steel Pipe

Superior High-Temperature Oxidation Resistance

The chromium content of 10.5-11.75% forms a protective chromium oxide layer that maintains stability at continuous operating temperatures up to 815°C (1500°F), significantly outperforming carbon steel alternatives which oxidize rapidly above 540°C. This exceptional anti-corrosion property extends component service life in automotive exhaust systems by 300-500% compared to aluminized steel.

Excellent Welding Characteristics

Titanium stabilization prevents chromium carbide precipitation during welding operations, enabling optimal fusion properties without post-weld heat treatment requirements. Compatible with TIG, MIG, and resistance welding processes using ER409 filler metal per AWS A5.9, achieving weld joint efficiency of 85-90% of base metal strength.

409 stainless steel pipe supplier

Cost-Effective Alternative to Austenitic Grades

Offering mill-direct rates 40-50% lower than 304 or 316L stainless steel, 409 provides factory-competitive pricing for applications where high-temperature oxidation resistance is critical but corrosion from chlorides or acids is not a concern. The ferritic structure eliminates nickel content, reducing material costs while maintaining performance in exhaust gas environments.

409 stainless steel pipe wholesale

Thermal Expansion Compatibility

With a coefficient of thermal expansion of 11.0 × 10⁻⁶/°C (20-100°C), closely matching carbon steel at 11.7 × 10⁻⁶/°C, 409 stainless steel pipe minimizes thermal stress in assemblies combining dissimilar metals, reducing risk of joint failure in cyclic temperature applications.

Primary Applications and Industry Usage

Automotive Exhaust Systems

Serves critical roles in catalytic converter housings, muffler assemblies, exhaust manifolds, and tailpipe sections where exhaust gas temperatures range from 400-800°C. The material's resistance to sulfur-containing combustion products and thermal cycling makes it the industry standard for original equipment manufacturers (OEM) and aftermarket suppliers.

Industrial Heat Exchangers

Commonly employed for shell and tube heat exchangers in applications involving hot air, flue gas, or low-corrosivity process streams at temperatures below 815°C. Typical installations include waste heat recovery systems, air preheaters, and economizers in power generation facilities.

Architectural and Structural Components

Finds extensive application in building facades, roofing systems, and structural supports in moderate coastal environments where atmospheric corrosion resistance is required without the premium cost of austenitic stainless steels. The ferritic structure provides adequate durability for interior architectural elements and non-critical outdoor applications.

Surface Finishes and Processing Options

Our 409 stainless steel pipe is readily accessible in multiple surface conditions including mill finish (2B equivalent), bright annealed (BA), and mechanically polished finishes ranging from 180 to 320 grit. Specialized processing capabilities include pickling and passivation per ASTM A380 to remove heat tint and enhance surface oxide layer formation, as well as precision cutting, beveling, and threading services to meet specific installation requirements.

Corrosion Resistance Characteristics

Oxidation Performance

Laboratory testing per ASTM G54 demonstrates oxidation rates below 0.5 mg/cm² after 1000 hours exposure at 815°C in air atmosphere, validating superior resistance to high-temperature scaling compared to carbon steel which exhibits rates exceeding 15 mg/cm² under identical conditions.

Environmental Limitations

While exhibiting outstanding anti-corrosion properties in dry, high-temperature oxidizing environments, 409 stainless steel shows limited resistance to chloride-containing atmospheres, acidic condensates, and marine splash zones. For such applications, austenitic grades like 316L or duplex stainless steels are recommended alternatives.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard minimum order quantity for 409 stainless steel pipe is 1 metric ton per specification, though we accommodate smaller quantities for sample evaluation or prototype development with applicable small-lot surcharges. Volume discounts apply for orders exceeding 10 metric tons with pricing reductions of 5-12% depending on total tonnage and delivery schedule flexibility.

Do you provide material test certificates?

Yes, every shipment includes comprehensive mill test certificates (MTC 3.1 per EN 10204) documenting chemical composition analysis, mechanical property test results, heat treatment records, and dimensional inspection data. Certificates are traceable to original melt numbers and comply with ASTM A268 Section 9 certification requirements. Third-party inspection services through SGS, TÜV, or Lloyd's Register can be arranged upon request.

What is the typical delivery time?

Standard stock sizes in mill finish are extensively stocked with delivery within 7-10 business days for quantities up to 5 metric tons. Custom dimensions, special surface finishes, or cut-to-length requirements typically require 4-6 weeks production lead time depending on mill scheduling and current order backlog. Expedited processing is available for critical projects with 15-20% premium pricing.

Can you cut to custom sizes?

Our precision cutting capabilities accommodate custom length requirements from 100mm to 12,000mm with tolerance of ±3mm using automated saw cutting equipment. Additional processing services include laser cutting for complex profiles, CNC beveling for weld preparation (30°, 37.5°, or custom angles), and threading per ASME B1.20.1 for NPT connections. All cut pieces undergo deburring and dimensional verification prior to shipment.

Get a Competitive Quote for 409 Stainless Steel Pipe

Partner with a trusted supplier offering two decades of expertise in ferritic stainless steel distribution and processing. Our technical sales team provides professional consultation on material selection, welding procedures, and application-specific recommendations to ensure optimal performance in your high-temperature projects. Request your detailed quotation today and experience the advantages of working with an ISO 9001:2015 certified supplier committed to quality, reliability, and customer satisfaction.

24/7 customer support available via phone, email, and live chat
Free samples for quality evaluation - up to 3 pieces per specification
Competitive pricing for bulk orders with volume discounts up to 12%
Professional technical consultation on welding procedures and material compatibility
Flexible payment terms including LC, TT, and approved credit accounts
Global logistics support with FOB, CIF, and DDP delivery options

Contact us today to get your free quote within 24 hours! Our experienced team is ready to support your project requirements with premium-grade 409 stainless steel pipe backed by complete certification documentation and reliable delivery performance.

409 stainless steel pipe China

Ratings & Reviews

4.5

Based on 10 reviews

5 6

4 3

3 1

2 0

1 0

John Smith

United States

2025-07-02

Acceptable Quality with Documentation Issues Resolved

Decent product overall with some initial documentation challenges that were ultimately resolved. We ordered 4 tons of 409 welded pipe (60.3mm OD, 2.0mm wall thickness) for our industrial oven exhaust ductwork project operating at 650°C. The material quality met ASTM A268 specifications with proper chemical composition and mechanical properties verified by our third-party testing laboratory. However, the initial MTC 3.1 certificates shipped with the material contained heat number discrepancies that didn't match the pipe identification markings, causing our quality department to place the entire shipment on hold pending clarification. This created a 5-day delay in our fabrication schedule while we worked with their documentation team to obtain corrected certificates with proper traceability. To their credit, their quality manager responded within 24 hours of our notification, conducted internal investigation, and provided revised certificates within 3 business days along with root cause analysis showing a clerical error in their certificate generation system. They also implemented corrective action to prevent recurrence and offered expedited shipping at no charge on our next order as compensation for the inconvenience. The pipe itself performed well in our welding trials using ER409 filler metal, achieving good fusion and no cracking in heat-affected zones. Surface condition was acceptable mill finish with minor scale that cleaned easily with wire brushing. Dimensional accuracy was within ASTM A999 tolerances. I would suggest they implement additional quality checks on documentation before shipment to prevent similar issues. Overall acceptable supplier once the paperwork issues were corrected, and their responsive problem-solving approach demonstrated commitment to customer satisfaction. 3 stars reflects the initial documentation problem, but their professional handling of the situation and quality of the actual material warrants consideration for future orders with expectation of improved administrative processes.

Wei Chen

Singapore

2025-07-15

Excellent 409 Pipe Stock Program for Distribution Business

Outstanding partnership supporting our Southeast Asian distribution network for industrial and automotive stainless steel products. This is our 6th order establishing a reliable stock replenishment program for 409 pipe serving customers across Singapore, Malaysia, Thailand, and Indonesia. We ordered 18 tons this quarter (comprehensive size range from 25.4mm to 114.3mm OD, wall thickness 1.0-3.0mm, mixed seamless and welded types) to maintain our warehouse inventory levels for quick customer fulfillment. Their ability to consolidate multiple specifications into single container shipments has reduced our logistics costs by approximately 25% versus ordering individual sizes from different mills. Quality documentation is comprehensive - every heat lot includes MTC 3.1 certificates with complete chemical composition analysis via optical emission spectrometry, mechanical property test results from accredited laboratories, and dimensional inspection reports with statistical process control data. This documentation level satisfies our most demanding customers in petrochemical and power generation sectors requiring full material traceability. The material quality has been consistent across all six orders spanning 20 months - we conduct incoming inspection on 10% random samples and have never identified non-conformances requiring rejection or material review board disposition. Their technical sales team provides valuable market intelligence on pricing trends, mill production schedules, and raw material availability that helps us optimize our purchasing timing and inventory investment. Delivery reliability is exceptional - 5 out of 6 shipments arrived within their quoted 12-14 day window to Singapore port, with proactive communication on the one delayed shipment due to typhoon-related port closures in China. Looking forward to continued growth of our partnership as we expand into Vietnam and Philippines markets where 409 demand is increasing for automotive and appliance manufacturing applications.

Chris Martin

Canada

2025-08-07

Superior 409 Tubing for Aftermarket Exhaust Manufacturing

Long-term partnership for automotive aftermarket exhaust components. This is our 9th order over 32 months supplying our North American distribution network with 409 pipe for custom exhaust fabrication shops and muffler manufacturers. We ordered 14 tons this shipment (multiple sizes: 50.8mm, 63.5mm, 76.2mm OD with 1.2mm and 1.5mm walls, all in 20-foot lengths for our cutting operations). The material consistency has been outstanding across all previous orders - chemical composition variation between heat lots stays within 0.3% for chromium content, ensuring uniform welding characteristics for our diverse customer base using various welding processes from MIG to TIG. The titanium stabilization prevents sensitization issues that plagued our previous supplier's material, eliminating customer complaints about weld zone corrosion in salt-exposed winter conditions. Surface finish quality in mill condition is excellent with minimal scale and no pitting, reducing our customers' pre-weld cleaning time by approximately 30% versus alternative suppliers. Dimensional accuracy is exceptional - we conduct random sampling on every shipment and consistently measure OD tolerance within ±0.2mm and wall thickness within ±0.06mm across 50-piece samples. This precision is critical for our customers' mandrel bending operations and slip-fit assembly designs. Delivered to our Toronto warehouse in 10 days via container to Vancouver port then rail freight, matching their quoted timeline. Their flexible payment terms (60-day NET for established customers) and willingness to accommodate our mixed-specification orders without minimum quantity penalties per size has been invaluable for our inventory management. Pricing remains competitive with 8% volume discount applied consistently as our order quantities have grown. Highly recommend for high-volume automotive exhaust applications requiring reliable material properties and dimensional consistency.

Robert Brown

United Kingdom

2025-08-30

Good Quality 409 Pipe with Competitive Lead Times

Good value proposition for our industrial heat exchanger fabrication business. We compared quotes from 5 European and Asian suppliers, and their pricing was 22% below UK-based stockists while maintaining ISO 9001:2015 certification and comprehensive MTC 3.1 documentation per EN 10204. Ordered 6 tons of 409 welded pipe (48.3mm OD, 2.3mm wall thickness, 6-meter random lengths) for air preheater tube bundles in our biomass power plant project operating at 580°C. The material quality was good with chemical composition meeting ASTM A268 requirements - chromium at 11.0%, titanium at 0.45%, carbon at 0.065%. Mechanical properties exceeded minimums with tensile strength at 395 MPa. However, approximately 12% of the tubes showed minor weld seam offset (0.3-0.5mm) that required additional grinding before our orbital welding operations, adding 4 hours of labor to our fabrication schedule. Their customer service responded quickly when we reported the issue and offered a 5% credit on our next order as goodwill gesture. Delivery was 13 days to our Birmingham facility, within their quoted 12-15 day window. The packaging was adequate with bundle strapping and plastic wrapping, though we recommend they add more protective separation between layers to prevent surface contact marking during transit. Overall, reliable supplier for industrial applications where minor cosmetic variations are acceptable. 4 stars because the weld seam quality variation required additional processing, but the responsive customer service and competitive pricing make them a viable option for our future heat exchanger projects.

William Taylor

Australia

2025-09-21

Perfect 409 Material for Marine Diesel Exhaust Systems

Long-term partner for ferritic stainless steel exhaust components. This is our 11th order over the past 4 years totaling approximately 95 tons of 409 pipe for our commercial vessel exhaust system manufacturing. Their consistency in material quality, dimensional accuracy, and delivery reliability has been exceptional across every shipment. We ordered 7.5 tons this time (various specifications: 63.5mm, 76.2mm, and 88.9mm OD with 1.5-2.0mm walls) for marine diesel exhaust installations on fishing trawlers and coastal ferries operating in Australian waters. The material's thermal expansion coefficient matching carbon steel components has proven critical in our welded assemblies, eliminating thermal stress failures we experienced with austenitic grades in cyclic temperature marine applications. Their technical support team provides valuable welding procedure specifications and post-weld treatment recommendations that have reduced our rejection rate to below 2%. The ASTM A268 certification documentation has passed every third-party inspection by Lloyd's Register and DNV without issues. Delivery consistency is remarkable - 9 out of 11 orders arrived within their quoted 10-12 day timeframe to our Perth facility, with the two exceptions communicated proactively with alternative solutions offered. Pricing remains competitive even as our order volumes have grown, with volume discounts applied transparently. Looking forward to continued partnership as we expand our marine exhaust product line into larger commercial vessels requiring 409's superior oxidation resistance at 650-800°C operating temperatures.

Ahmed Al-Hassan

United Arab Emirates

2025-10-14

Reliable 409 Pipe for Architectural Facade Project

Solid performance on our Dubai commercial building facade project. We compared quotes from 4 suppliers in UAE, India, and China, and their FOB pricing was competitive at 12% below local Dubai stockists while offering superior EN 10204 3.1 certification documentation. Ordered 9 tons of 409 welded pipe (101.6mm OD, 2.0mm wall, mechanically polished to 240 grit finish) for architectural column cladding and decorative structural elements. The polished surface finish was generally good with consistent grain pattern, though approximately 8% of pieces showed minor polishing lines requiring additional buffing by our fabrication team before installation. Material certificates confirmed compliance with required specifications. The ferritic magnetic properties were ideal for our magnetic mounting system design. Delivery took 16 days to Jebel Ali port versus quoted 12-14 days, causing minor coordination issues with our installation contractor's schedule. However, their logistics team arranged direct container delivery to our fabrication facility at no additional cost, which partially offset the delay inconvenience. The pipe straightness was excellent at 1.8mm per meter maximum deviation, well within our architectural tolerances. Overall, reliable supplier for non-critical architectural applications in moderate coastal environments. 4 stars due to the delivery delay and minor surface finish inconsistencies, but would order again for similar projects where slight schedule flexibility exists.

Hans Mueller

Germany

2025-11-05

Premium 409 Seamless Pipe for Automotive OEM Production

We ordered 22 tons of 409 seamless stainless steel pipe (various sizes from 38mm to 89mm OD, wall thickness 1.2-2.5mm) for our automotive exhaust manifold manufacturing line supplying German OEM clients. Quality assessment revealed exceptional material consistency - chemical composition analysis showed chromium at 10.8-11.1% across all heat numbers, carbon content consistently below 0.06%, and titanium stabilization at 0.38-0.52%, all within tight EN 10217-7:2014 specifications. We conducted extensive mechanical testing including tensile tests per DIN EN ISO 6892-1, achieving yield strength of 215-242 MPa and elongation of 22-26% across random samples from different production lots. Surface quality was outstanding with bright annealed finish showing Ra values below 0.4μm, eliminating need for additional surface preparation before welding. The dimensional tolerances were remarkable - OD variance within ±0.15mm and wall thickness within ±0.08mm on our CMM measurements, far exceeding ASTM A999 standard tolerances. This precision significantly reduced our scrap rate during mandrel bending operations for complex exhaust geometries. Delivered to our Stuttgart facility in 8 days via dedicated truck with temperature-controlled storage. This is our 7th order over 3 years. Their consistency in quality, precision manufacturing, and reliable delivery performance has made them our preferred 409 pipe supplier for high-volume automotive production.

Carlos Silva

Brazil

2025-11-28

Good Value 409 Tubing for Industrial Furnace Applications

Good value for the price on our furnace component order. We compared quotes from 6 suppliers across South America, Asia, and Europe, and their mill-direct pricing was 18% lower than the nearest competitor while maintaining ASTM A268-19 certification and full traceability documentation. We ordered 5.5 tons of welded 409 pipe (50.8mm OD, 2.0mm wall) for our industrial furnace exhaust ductwork operating at 720°C continuous temperature. The material quality met our specifications with tensile strength at 412 MPa and yield strength at 238 MPa, both exceeding ASTM minimums. However, delivery took 19 days versus their quoted 14-day lead time due to customs clearance delays at São Paulo port, which caused minor project scheduling adjustments. The packaging could be improved - while adequate, some pieces showed minor surface scratches from transit handling, though none affected structural integrity or weld performance. Their customer service team proactively communicated the delay and provided daily shipment tracking updates, which we appreciated. Overall, solid supplier for cost-sensitive projects where slight delivery flexibility exists. 4 stars because the extended lead time required us to adjust our installation timeline, though the material quality and pricing justified the wait.

James Wilson

United Kingdom

2025-12-18

Outstanding Service and Technical Support for Heat Exchanger Project

Excellent service experience from inquiry to delivery for our waste heat recovery system project. Communication was exceptional - their technical team responded within 3 hours to our initial RFQ with detailed specifications on thermal expansion coefficients and welding procedure recommendations for ER409 filler metal. They provided professional consultation on material selection, confirming that 409 would outperform carbon steel alternatives in our 680°C flue gas environment while offering 45% cost savings versus 316L. Delivery was impressive - 12 tons of seamless pipe (60.3mm OD, 3.2mm wall, 6-meter lengths) arrived at our Manchester facility in 11 days, beating their 14-day commitment. Packaging was industrial-grade with wooden crates, plastic end caps, and individual piece identification tags matching MTC 3.1 certificates. Every pipe was protected against transit damage and moisture. The dimensional accuracy was outstanding with OD tolerance within ±0.3mm across all 240 pieces. Their after-sales support included follow-up calls to verify installation progress and welding parameter optimization. This level of customer care is rare in the steel supply industry. We've already placed our second order for an additional 15 tons for phase two of our project.