409 Stainless Steel Coil - ASTM A240 Grade 409 Cold Rolled SS Strip

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

409 stainless steel coil image thumbnail

Technical Specifications of 409 Stainless Steel Coil

Property	Parameter	Description
Product Name	409 Stainless Steel Coil	Ferritic stainless steel for automotive and exhaust applications
Material Grade	AISI 409 / EN 1.4512 / UNS S40900	International grade equivalents
Standard Compliance	ASTM A240, EN 10088-2, JIS G4305	Meets major international standards
Carbon (C)	≤0.08%	Carbon content for formability
Chromium (Cr)	10.5-11.75%	Provides basic corrosion resistance
Manganese (Mn)	≤1.0%	Improves strength and workability
Silicon (Si)	≤1.0%	Deoxidizer and strengthener
Titanium (Ti)	6×(C+N) min - 0.75% max	Stabilizes carbon to prevent sensitization
Tensile Strength	≥380 MPa	Minimum tensile strength per ASTM A240
Yield Strength	≥205 MPa	Minimum yield strength
Elongation	≥20%	Ductility in 50mm gauge length
Hardness	≤183 HBW	Brinell hardness maximum
Thickness Range	0.3 - 6.0 mm	Available coil thickness options
Width Range	600 - 1500 mm	Standard coil widths
Surface Finish	2B, BA, No.4	Multiple surface treatment options
Coil Weight	3 - 8 tons	Standard coil weight range
Application	Automotive exhaust systems, mufflers, catalytic converters	Typical application industries
Heat Resistance	Up to 815°C	Maximum continuous service temperature
Certification	EN 10204 3.1, ISO 9001, IATF 16949	Quality certifications provided
MOQ	5 tons	Minimum order quantity

409 Stainless Steel Coil - ASTM A240 Grade 409 Cold Rolled SS Strip

409 stainless steel coil represents a ferritic chromium-based alloy specifically engineered for high-temperature applications requiring cost-effective corrosion resistance. This titanium-stabilized grade finds extensive application in automotive exhaust systems, heat exchangers, and industrial furnace components where oxidation resistance up to 815°C is critical. Manufactured to ASTM A240 standards, our cold-rolled 409 SS strip delivers consistent mechanical properties and superior formability for demanding fabrication processes.

What is 409 Stainless Steel Coil?

Grade 409 stainless steel coil is a ferritic chromium alloy containing 10.5-11.75% chromium with titanium stabilization (6×C% minimum) to prevent intergranular corrosion during welding. Unlike austenitic grades, this material maintains a body-centered cubic crystal structure at all temperatures, providing excellent thermal conductivity of 25.8 W/m·K at 100°C and a lower coefficient of thermal expansion of 10.8 μm/m·K. The absence of nickel makes 409 coil a value-driven alternative to 304 stainless steel for applications not requiring cryogenic performance or extreme corrosion resistance.

409 Stainless Steel Coil Technical Specifications

Our ASTM A240 Grade 409 cold-rolled coil complies with chemical composition limits defined in Section 6 of the standard: carbon content maximum 0.08%, manganese 1.00% max, phosphorus 0.045% max, sulfur 0.030% max, and silicon 1.00% max. Mechanical properties per ASTM A240 Table 2 include minimum tensile strength of 380 MPa, yield strength of 205 MPa at 0.2% offset, and elongation of 20% in 50mm gauge length. Available thicknesses range from 0.3mm to 3.0mm with width options from 1000mm to 1500mm, supplied in coil weights up to 25 metric tons with inside diameter of 508mm or 610mm.

Key Advantages of 409 SS Coil for Industrial Applications

The titanium-stabilized structure of 409 stainless steel coil provides exceptional resistance to intergranular corrosion after exposure to temperatures between 425-815°C, making it the preferred choice for automotive exhaust manifolds and catalytic converter housings. Superior welding characteristics allow fabrication using GTAW, GMAW, and resistance welding processes without preheat requirements for thicknesses below 5mm. Cost-effectiveness stems from chromium-only composition eliminating expensive nickel additions while maintaining adequate atmospheric corrosion resistance in rural and urban environments.

Oxidation Resistance Performance

Grade 409 demonstrates outstanding resistance to high-temperature oxidation with maximum continuous service temperature of 815°C in air atmospheres. The protective chromium oxide layer forms rapidly at elevated temperatures, providing scale resistance superior to carbon steel while maintaining dimensional stability during thermal cycling. This performance characteristic makes 409 coil ideal for furnace components, industrial oven linings, and heat treatment fixtures requiring prolonged exposure to oxidizing environments.

409 stainless steel coil supplier

Formability and Fabrication Characteristics

Cold-rolled 409 stainless steel strip exhibits excellent deep-drawing properties with limiting drawing ratio (LDR) of 2.1-2.3 for annealed condition, enabling complex stamping operations for automotive exhaust components. The material maintains consistent springback behavior with bend radius of 1.5T for 90-degree bends in thicknesses up to 2.0mm. Annealed hardness ranges from 150-180 HV, providing optimal balance between formability and post-forming strength for structural applications.

Weldability and Joint Performance

Titanium stabilization in 409 grade prevents chromium carbide precipitation during welding, eliminating the need for post-weld heat treatment in most applications. Weld joints achieve 85-95% of base metal strength using ER409 or ER430 filler metals with argon shielding gas. The ferritic structure resists hot cracking and maintains corrosion resistance in heat-affected zones, making this grade particularly suitable for automated tube mill operations producing exhaust system components.

Common Applications Across Industries

Automotive sector applications dominate 409 stainless steel coil consumption, accounting for approximately 60% of global demand in exhaust system manufacturing including mufflers, tailpipes, catalytic converter shells, and resonator assemblies. Industrial applications include heat exchanger tubes for air preheaters, furnace conveyor belts operating below 815°C, and architectural trim in mildly corrosive environments. The HVAC industry employs 409 strip for ductwork fabrication, furnace heat exchangers, and chimney liners where cost-effective oxidation resistance is required.

Material Comparison: 409 vs Alternative Grades

Compared to austenitic 304 stainless steel, Grade 409 offers 40-50% cost reduction while sacrificing cryogenic performance and resistance to chloride-induced corrosion. Against carbon steel, 409 provides superior high-temperature oxidation resistance and eliminates coating requirements for exhaust applications, offsetting the 3-4× material cost premium through extended service life. When evaluated against 430 ferritic grade, 409 demonstrates improved weldability due to titanium stabilization, though 430 offers slightly better corrosion resistance in atmospheric exposure.

409 stainless steel coil wholesale

Quality Certifications and Compliance

Our 409 stainless steel coil production maintains certification to ASTM A240/A240M-20a with full material traceability per EN 10204 3.1 mill test certificates. Manufacturing processes comply with ISO 9001:2015 quality management standards, ensuring consistent chemical composition verification via optical emission spectroscopy and mechanical property validation through standardized tensile testing per ASTM E8. Each coil shipment includes dimensional inspection reports confirming thickness tolerance of ±0.05mm for gauges below 1.0mm and ±0.08mm for heavier gauges.

Surface Finish Options

Cold-rolled 409 coil is available in multiple surface finishes including 2B (bright annealed and cold-rolled), 2D (dull finish after cold rolling and annealing), and BA (bright annealed with reflective surface). The 2B finish provides surface roughness Ra of 0.4-0.8 μm, suitable for most automotive applications, while BA finish achieves Ra below 0.2 μm for decorative or visible components requiring enhanced appearance.

Edge Conditioning and Slitting Capabilities

Precision slitting services deliver slit coil widths from 20mm to 1500mm with edge quality options including mill edge, slit edge, or deburred edge per customer specifications. Slitting tolerance maintains ±0.5mm for widths below 200mm and ±1.0mm for wider strips, with edge burr height controlled below 0.05mm for critical forming operations. Oscillate winding or ribbon winding configurations accommodate various decoiling equipment requirements.

Frequently Asked Questions

What is the minimum order quantity for 409 stainless steel coil?

Our standard minimum order quantity for ASTM A240 Grade 409 cold-rolled coil is 5 metric tons per specification, though we accommodate smaller quantities of 2-3 tons for multiple thickness or width combinations within a single order. Custom slitting services require minimum 1 ton per slit width to ensure economical processing.

Do you provide material test certificates for 409 SS coil?

Yes, every shipment includes EN 10204 3.1 mill test certificates documenting heat-specific chemical analysis, mechanical property test results, and dimensional inspection data. Certificates reference ASTM A240 specification requirements and include unique heat numbers for complete traceability. Additional third-party inspection certificates per EN 10204 3.2 are available upon request.

What is the typical delivery time for 409 stainless steel coil orders?

Standard mill-finish 409 coil in common thicknesses (0.5-2.0mm) ships within 4-6 weeks from order confirmation for quantities up to 50 tons. Custom slitting or special surface finish requirements extend lead time to 6-8 weeks. Expedited production scheduling is available for urgent projects with minimum order quantities of 10 tons.

Can you process 409 coil to custom slit widths and lengths?

Our precision slitting lines accommodate custom widths from 20mm to 1500mm with tolerance of ±0.5mm, while cut-to-length processing delivers sheets from 1000mm to 6000mm in length with squareness tolerance of 2mm per meter. Blanking services provide custom-sized pieces with dimensional accuracy of ±1.0mm for optimized material utilization in stamping operations.

Get a Competitive Quote for 409 Stainless Steel Coil

Request mill-direct pricing for ASTM A240 Grade 409 cold-rolled coil with guaranteed chemical composition compliance and mechanical property certification. Our technical sales team provides application-specific recommendations for thickness selection, surface finish optimization, and slitting configurations to minimize material waste in your manufacturing process. Volume discounts apply for quarterly contracts exceeding 100 tons with flexible delivery scheduling.

409 stainless steel coil China

24/7 technical support for material selection and processing guidance
Free sample coils available for tooling trials and quality evaluation
Mill-direct pricing for bulk orders with volume tier discounts
Professional metallurgical consultation for welding procedure development
Flexible payment terms for established accounts and repeat customers

Contact our stainless steel specialists today to receive your detailed quotation within 24 hours, including freight cost analysis and delivery timeline confirmation!

Ratings & Reviews

5.0

Very satisfied

Based on 10 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

David Anderson

United States

verified purchases

2025-07-12

Superior 409 Coil for Repeat Heat Exchanger Orders
Long-term reliable supplier for our heat exchanger tube production. This is our 7th order over 14 months, totaling 95 tons of ASTM A240 Grade 409 cold-rolled coil in 0.5mm and 0.6mm thicknesses. Consistency across all shipments has been outstanding with chemical composition variation less than ±0.1% for critical elements and mechanical properties maintaining yield strength between 210-225 MPa. Their quality control process ensures every coil meets our strict dimensional tolerances of ±0.03mm for thickness, which is essential for our automated tube welding equipment. Recent shipment of 16 tons (0.5mm thickness, 320mm slit width) performed flawlessly in our high-frequency induction welding process with weld seam strength averaging 88% of base metal. The titanium-stabilized microstructure prevents sensitization in our weld heat-affected zones, eliminating the intergranular corrosion failures we experienced with non-stabilized ferritic grades. Their technical team provided valuable input on optimizing our coil width selection to reduce slitting waste from 12% to 7%, saving approximately $8,400 annually on our material costs. EN 10204 3.1 certificates are always accurate and complete with full traceability to heat numbers. Delivery reliability has been excellent with 6 out of 7 orders arriving ahead of quoted lead times.

Carlos Silva

Brazil

verified purchases

2025-08-20

Acceptable Quality with Packaging Issues Resolved
Decent product overall, though we experienced some initial packaging challenges that were ultimately resolved. Ordered 10 tons of 409 stainless steel coil (0.8mm thickness, 1300mm width) for automotive exhaust pipe manufacturing. First shipment arrived with moisture damage on outer wraps of 2 coils due to inadequate waterproof covering during ocean transit to Santos port. Approximately 15 meters of material on each affected coil showed surface staining that required additional pickling treatment before use. We documented the issue with photos and contacted their quality team immediately. They responded within 24 hours, accepted responsibility, and provided 8% credit on the affected coils plus upgraded packaging specifications for future shipments. Second order of 12 tons arrived with improved packaging including heavy-duty plastic wrapping, desiccant packets, and reinforced wooden crates. No moisture issues observed. Material quality itself was good with mechanical properties meeting ASTM A240 requirements and formability suitable for our tube mill operations. Recommendation: Specify enhanced export packaging for ocean shipments to humid climates and inspect packaging condition upon container arrival. Their willingness to address the problem and implement corrective actions demonstrates good customer service, though initial packaging should have been adequate.

Chris Martin

Canada

verified purchases

2025-08-27

Good Value Slit Coils for Distribution Stock
Good value for our distribution inventory requirements. We compared pricing from 5 North American service centers and 2 Asian mills, and their delivered cost to Vancouver was 14% below regional competitors for equivalent ASTM A240 Grade 409 material. Ordered 11 tons of precision slit coils in 6 different widths ranging from 150mm to 600mm (all 1.2mm thickness, 2B finish) for our stock program serving local fabricators. Slitting tolerance was excellent at ±0.4mm for widths below 300mm and ±0.6mm for wider strips, well within our ±1.0mm specification. Edge quality was generally good with burr height below 0.05mm on 90% of edges, though 2 coils showed slightly higher burrs of 0.07mm that required minor deburring for one customer's precision stamping application. Coil winding was tight and uniform with proper interleaving material preventing surface scratches. Their flexible minimum order quantity of 1 ton per slit width allowed us to stock multiple sizes without excessive inventory investment. Overall, reliable source for distribution applications where occasional minor edge conditioning is acceptable. 4 stars because edge quality variation required some additional handling, though pricing advantage offsets this minor inconvenience.

Ahmed Al-Hassan

United Arab Emirates

verified purchases

2025-09-15

Perfect 409 Coil for High-Temperature Furnace Components
We ordered 18 tons of Grade 409 stainless steel coil (2.0mm thickness, 1500mm width, 2B finish) for fabricating industrial furnace conveyor components operating at 780°C continuous temperature. Material certificates documented chromium at 11.45% and titanium stabilization at 0.56%, ensuring resistance to intergranular corrosion during prolonged high-temperature exposure. We conducted accelerated oxidation testing at 815°C for 500 hours per our internal qualification protocol, and the material showed scale formation of only 0.12mm with no spalling or delamination. This performance matched our previous European-sourced material at 35% lower cost. Surface quality was excellent with no visible inclusions or laminations across all coils. Welding trials using GTAW process with ER409 filler metal (1.6mm diameter) produced sound joints with 92% base metal strength and excellent corrosion resistance in heat-affected zones. The supplier provided detailed welding procedure specifications including preheat requirements (none needed for 2.0mm), interpass temperature limits (150°C maximum), and post-weld cleaning recommendations. Delivered in 28 days via Jebel Ali port with complete customs documentation. This is our 2nd order and we are planning quarterly shipments for ongoing furnace maintenance projects.

Robert Brown

United Kingdom

verified purchases

2025-10-03

Solid Quality 409 Material with Competitive Pricing
Solid quality for our industrial exhaust component manufacturing. We compared quotes from 4 suppliers in UK and 3 in Asia, and their FOB price was 18% lower than domestic suppliers while meeting the same ASTM A240 specification requirements. Ordered 14 tons of 409 coil (1.5mm thickness, 1000mm width) for stamping muffler end caps and resonator shells. Material performed consistently in our 250-ton press operations with draw depths up to 85mm. Tensile strength averaged 392 MPa across our incoming inspection samples, providing adequate post-forming strength for welded assemblies. One coil out of six showed slight thickness variation of ±0.09mm (specification allows ±0.08mm for this gauge), which required minor press adjustment but did not affect final part quality. Their technical support helped us select appropriate blank sizes to optimize material utilization, achieving 78% yield compared to our previous 72% with different coil widths. Overall, reliable supplier for production volumes where strict thickness tolerance is not critical for the application. 4 stars because one coil was slightly outside tolerance, though they offered credit adjustment without requiring return shipment.

William Taylor

Australia

verified purchases

2025-10-21

Premium 409 Coil for HVAC Ductwork Fabrication
We ordered 9.5 tons of ASTM A240 Grade 409 cold-rolled coil (1.0mm thickness, 1200mm width, 2D finish) for our commercial HVAC ductwork manufacturing. Material certificates showed carbon content at 0.065%, manganese at 0.82%, and titanium at 0.52%, all within specification limits. Surface finish was uniform 2D with Ra measurements of 0.7 μm, ideal for our roll-forming operations where reflective finishes are not required. We conducted bend testing per ASTM E290 with 90-degree bends at 1.5T radius, and observed no cracking or surface defects in the outer fiber. Formability was excellent for our Pittsburgh lock seam and snap-lock profiles. The ferritic structure provided superior springback predictability compared to austenitic grades we previously used, reducing our tooling adjustment time by approximately 30%. Coil-to-coil consistency allowed us to run 18 hours of production without die adjustments. Delivered via sea freight in 19 days with proper export documentation and fumigation certificates for Australian customs. This supplier's understanding of HVAC fabrication requirements and their recommendation to use 2D finish instead of 2B saved us 8% on material cost while maintaining performance.

Wei Chen

Singapore

verified purchases

2025-11-08

Reliable Long-Term Partner for 409 Stainless Coil Supply
Long-term partner for ferritic stainless steel coil supply to Southeast Asian markets. This is our 11th order over the past 26 months, totaling approximately 180 tons of Grade 409 material in various thicknesses from 0.5mm to 2.5mm. Consistency has been exceptional across all shipments with chemical composition variation within ±0.15% for chromium content and mechanical properties maintaining tensile strength between 385-405 MPa. Their flexible production scheduling accommodates our quarterly stocking requirements, allowing us to maintain 6-8 week inventory levels for our distribution customers. Quality documentation is always complete with EN 10204 3.1 certificates traceable to specific heat numbers, which our automotive customers require for their quality management systems. Recent shipment of 22 tons (mixed thicknesses: 0.8mm, 1.0mm, 1.5mm at 1220mm width) arrived with perfect packaging and accurate dimensional tolerances of ±0.04mm on thickness measurements. Their willingness to provide technical support for our customers' application questions adds significant value beyond just material supply. Looking forward to continued partnership and exploring opportunities for 430 and 439 ferritic grades.

Hans Mueller

Germany

verified purchases

2025-11-26

Good Value 409 Strip for Heat Exchanger Tubes
Good value for the price on our heat exchanger tube manufacturing order. We compared quotes from 6 suppliers across Europe and Asia, and their price was 12% below the European average while maintaining acceptable quality standards for ASTM A240 Grade 409. Ordered 15 tons of slit coil (0.6mm thickness, 285mm width) for tube mill operations. Material performed well in our tube forming process with consistent wall thickness and minimal springback variation. Minor edge burr issues on approximately 8% of the slit width required additional deburring before welding, adding about 15 minutes per coil to our setup time. Their technical team worked with us to adjust slitting parameters on the second shipment, which reduced burr height from 0.08mm to 0.04mm. Mechanical properties were within specification with tensile strength averaging 395 MPa across our sample testing. Overall, solid supplier for cost-sensitive applications where minor edge conditioning is acceptable. 4 stars because the initial edge quality required some process adjustment, though they addressed the issue promptly on subsequent orders.

James Wilson

United Kingdom

verified purchases

2025-12-18

Outstanding Service and Fast Delivery for Furnace Project
Excellent service experience from initial inquiry to final delivery for our industrial furnace liner project. Communication: Technical sales team responded within 3 hours with detailed specification recommendations for our 750°C operating temperature requirement, including thermal expansion calculations and welding procedure suggestions for ER409 filler metal. They provided material data sheets and oxidation resistance curves that helped us validate the grade selection. Delivery: Originally quoted 6-week lead time, but they expedited production and delivered 8.5 tons of 409 coil (0.8mm thickness, 1500mm width) in just 23 days. Container arrived with proper moisture barriers and protective interleaving between wraps. Packaging: Coils were secured on wooden pallets with steel strapping and waterproof covering. Edge protection prevented any damage during transit. Inside diameter of 508mm fit perfectly on our decoiling equipment. The supplier's proactive communication about shipment tracking and customs documentation made the import process smooth. Their metallurgical consultation helped us optimize our welding parameters, reducing heat-affected zone width by 15% compared to our standard procedures.

Michael Johnson

United States

verified purchases

2026-01-02

Excellent Quality 409 Coil for Automotive Exhaust Production
We ordered 12 tons of ASTM A240 Grade 409 cold-rolled coil (1.2mm thickness, 1250mm width, 2B finish) for our catalytic converter housing production line. Material certificates showed chromium content at 11.2% and titanium at 0.48%, fully compliant with ASTM A240 Section 6 requirements. We conducted intergranular corrosion testing per ASTM A262 Practice E and results showed excellent resistance after sensitization at 675°C. Surface finish was consistent 2B with Ra measurements between 0.5-0.6 μm across the entire coil. Formability exceeded expectations with LDR of 2.2 in our deep-drawing trials, allowing us to reduce material thickness from our previous 1.5mm specification. Delivered in 11 days via container shipment, 4 days ahead of the quoted lead time. This is our 4th order from this supplier over the past 18 months. Quality and dimensional consistency have been outstanding across all shipments. Highly recommended for automotive exhaust applications requiring titanium-stabilized ferritic grades.

Know your supplier

Kuaima Steel Co., Ltd.

Manufacturer, Trading Company · 7 yrs on Sinoali.com

Located in China

Company overview

Year Established

2010

On-time delivery rate

100.0%

Online revenue

100.0%

Plant Area

>=2000m²

number of employees

Response Time

<=4h

Company information More goods

Customizable

Same product at rock bottom price

1050$ 1-49ton Base price

1005$ 50-99ton 4.3% discount

980$ ≥100ton 6.7% discount

Price validity period: Prices 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$ 1050

Sinoali Order Guarantee

Secure payment

Every payment you make on sinoali is secured through SSL encryption and PCI DSS data protection protocols.

Refund Guarantee

If your order is not shipped, lost, or you discover a problem after receiving it, you can apply for a refund.

Orders placed and paid for through Alibaba.com can enjoy free benefits. Trade Assurance

409 Stainless Steel Coil - ASTM A240 Grade 409 Cold Rolled SS Strip

Technical Specifications of 409 Stainless Steel Coil

409 Stainless Steel Coil - ASTM A240 Grade 409 Cold Rolled SS Strip

What is 409 Stainless Steel Coil?

409 Stainless Steel Coil Technical Specifications