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Grade 439 Stainless Steel Sheet Thickness 0.8 - 10.0mm for Automotive Exhaust Systems
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x商品の詳細
| 製品 | ステンレス鋼板 | 学年 | 439 |
|---|---|---|---|
| 厚さ | 0.5～10.0 | 技術 | コールドロール |
| 幅 | 1219mm | 表面 | 2B 2D NO.1 |
| 標準 | ASTM GB JIS EN DIN | MOQ | 1トン |
製品の説明
Grade 439 Stainless Steel Sheet Thickness 0.8 - 10.0mm for Automotive Exhaust Systems
Stainless Steel Plate Specifications
| Name | 439 stainless steel Plate |
| Our Grade |
200 Series: 201 202 300 Series: 301 304,304L,304H,309S,310S,314,316L,316Ti,316H,316LN,317L,321,329,347 400 Series: 409L,410,410S,415,416,420,430,431,436L.439,441,443,444,445,446 Super Stainless Steel: 904L,926,254SMO,654SMO,15-5PH,17-4PH,17-7PH.etc Nickel Alloy: C276, C22,G35,Alloy X,Monel 400,K500,Inconel 600,601,617,625,718,Incoloy 800,800H,800HT,825.etc |
| Technique | Hot Rolled, Cold Rolled,Forged |
| Standard | JIS, AISI, ASTM, DIN, TUV, BV, SUS, etc |
| Thickness | 0.1 – 80.0mm |
| Width range | 10mm – 2000mm |
| Length | Customized |
| Finish | 2B,2D,NO.1, BA, No.4, 8k, Brushed,Hairline,PVD Coating,Sandblasted |
| Service | Laser Cutting, Bending |
| Sample | Available |
Grade 439 Stainless Steel Sheet – Thickness 0.8–10.0 mm for Automotive Exhaust Systems
Product Overview
Grade 439 stainless steel sheet is a high-performance, ferritic stainless steel specifically engineered for demanding applications in automotive exhaust systems. With its excellent corrosion resistance, superior high-temperature oxidation resistance, and outstanding formability, Grade 439 offers an ideal balance of cost-efficiency and durability—making it a preferred choice among global automotive manufacturers and Tier 1 suppliers.
Available in thicknesses ranging from 0.8 mm to 10.0 mm, this material meets stringent international standards including ASTM A240/A240M, EN 10088-2, and JIS G4305, ensuring consistent quality across diverse production environments. Whether used in mufflers, catalytic converters, manifolds, or tailpipes, Grade 439 delivers long service life under thermal cycling and aggressive exhaust gas conditions.
Why Choose Grade 439 for Automotive Exhaust?
Automotive exhaust components operate in harsh environments characterized by:
- Continuous exposure to high temperatures (up to 800°C / 1472°F)
- Condensation of acidic condensates (e.g., sulfuric and nitric acids)
- Thermal fatigue from repeated heating/cooling cycles
- Road salt and environmental pollutants
Grade 439 addresses these challenges through:
- Stabilization with Titanium (Ti): Prevents sensitization during welding and high-temperature exposure by binding carbon and nitrogen, minimizing chromium carbide precipitation.
- Low Carbon & Nitrogen Content: Enhances weldability and intergranular corrosion resistance.
- Chromium Content of 17–19%: Provides robust passive oxide layer formation for corrosion protection.
- Ferritic Structure: Offers good thermal conductivity and lower thermal expansion than austenitic grades (e.g., 304), reducing distortion.
Compared to standard 409 or 430 stainless steels, Grade 439 offers significantly improved high-temperature strength and oxidation resistance—bridging the performance gap toward more expensive grades like 321 or 347, but at a lower cost.
Key Specifications
| Property | Value / Range |
|---|---|
| Grade | UNS S43035 / ASTM 439 / EN 1.4510 |
| Thickness | 0.8 mm – 10.0 mm |
| Width | 600 mm – 2000 mm (customizable) |
| Length | As per customer requirement (cut-to-length coils or sheets) |
| Surface Finish | 2B, BA (Bright Annealed), No.1, Hairline, or Custom |
| Standards | ASTM A240, EN 10088-2, JIS G4305, GB/T 4237 |
| Delivery Condition | Annealed & Pickled, Cold Rolled |
| Certifications | ISO 9001, IATF 16949 (automotive quality management), RoHS, Material Test Reports (MTR) available |
Chemical Composition (Typical, wt%)
| Element | C | Si | Mn | P | S | Cr | Ni | N | Ti |
|---|---|---|---|---|---|---|---|---|---|
| Max/Range | ≤0.03 | ≤1.0 | ≤1.0 | ≤0.04 | ≤0.03 | 17.0–19.0 | ≤0.5 | ≤0.04 | ≥0.2 + 4(C+N); ≤1.10 |
Note: Titanium content is carefully controlled to ensure optimal stabilization without excessive grain growth.
Mechanical Properties (Annealed Condition)
| Property | Typical Value |
|---|---|
| Tensile Strength | 450–600 MPa |
| Yield Strength (0.2% offset) | ≥280 MPa |
| Elongation | ≥25% (in 50 mm) |
| Hardness (HRB) | ≤88 |
| Density | 7.70 g/cm³ |
| Melting Range | ～1425–1510°C |
These properties ensure excellent deep-drawing and bending capabilities—critical for complex exhaust component geometries.
Applications in Automotive Exhaust Systems
Grade 439 stainless steel sheets are widely used in the following components:
- Exhaust Manifolds
Resists thermal fatigue and scaling at elevated temperatures. - Catalytic Converter Housings
Maintains structural integrity under continuous high heat and chemical exposure. - Mufflers & Resonators
Combats internal corrosion from condensate and external road salt. - Tailpipes & Intermediate Pipes
Offers aesthetic durability and long-term rust resistance.
Its performance allows automakers to extend vehicle warranty periods on exhaust systems while meeting emissions and fuel efficiency targets.
Advantages Over Competing Grades
| Feature | Grade 439 | Grade 409 | Grade 430 | Grade 304 |
|---|---|---|---|---|
| Chromium (%) | 17–19 | 10.5–11.75 | 16–18 | 18–20 |
| Stabilized (Ti/Nb) | Yes (Ti) | Yes (Ti) | No | No (unless 321) |
| Max Service Temp (°C) | ～800 | ～650 | ～700 | ～870 |
| Corrosion Resistance | Excellent | Moderate | Good | Excellent |
| Cost Efficiency | High | Very High | High | Low |
| Weldability | Good | Good | Fair | Excellent |
Grade 439 strikes the optimal balance—offering near-austenitic performance at ferritic pricing.
Manufacturing & Quality Assurance
Our Grade 439 stainless steel sheets are produced using advanced AOD (Argon Oxygen Decarburization) refining and continuous casting technologies to minimize inclusions and ensure ultra-low interstitial content. Each coil undergoes:
- Ultrasonic Testing (optional for critical applications)
- Surface Inspection via automated vision systems
- Dimensional Accuracy Control (±0.02 mm tolerance on thickness)
- Full Mill Test Reports (MTRs) with chemical and mechanical data
We maintain IATF 16949 certification, ensuring compliance with automotive industry quality protocols. All products are traceable from melt to delivery.
Packaging & Logistics
To prevent surface damage during transit:
- Sheets are interleaved with anti-scratch paper
- Coils are wrapped in waterproof VCI film and secured on iron pallets
- Export-ready packaging compliant with ISO and customer-specific requirements
- Global shipping via FOB, CIF, or EXW terms
Lead time: 7–15 days from stock; 30–45 days for custom orders.
Environmental & Sustainability Benefits
- 100% Recyclable: Stainless steel retains value at end-of-life
- Lightweight Potential: Thinner gauges (e.g., 0.8–1.2 mm) reduce vehicle weight, improving fuel economy
- Long Service Life: Reduces replacement frequency and resource consumption
Grade 439 supports OEMs in achieving sustainability goals without compromising performance.
Technical Support & Customization
We offer:
- Material selection consultation
- Prototype development support
- Custom thicknesses, widths, and surface finishes
- Laser cutting, slitting, and blanking services
Our engineering team collaborates with customers to optimize material usage and reduce fabrication costs.
Conclusion
Grade 439 stainless steel sheet (0.8–10.0 mm) represents the smart choice for modern automotive exhaust systems—delivering exceptional corrosion and heat resistance, excellent formability, and cost-effective lifecycle performance. Backed by rigorous quality control and global supply capabilities, it empowers automakers to build cleaner, quieter, and longer-lasting vehicles.
Ready to upgrade your exhaust system materials? Contact us today for samples, technical data sheets, or a customized quote.
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