SUH409L Hot Rolled NO.1 Finished Stainless Steel Plate
Equivalent Grade:JIS G4304 SUH409L
Product Form:Stainless Steel Plate / Sheet
Manufacturing Process:Hot Rolled
Surface Finish:No.1
Thickness:3.0–50 mm
Width:1000–2000 mm
Length:2000–6000 mm
Surface Treatment:Pickled and descaled
Heat Treatment:Annealing as required by applicable standard
Edge:Mill Edge (No.1) / Cut Edge
Certificate:EN 10204 3.1 Mill Test Certificate
Packing:Waterproof Paper + Steel Strapping + Wooden Pallet / Customized
What is SUH409L stainless steel sheet?
SUH409L Hot-Rolled No.1 Finish Stainless Steel Plate is a titanium-stabilized low-carbon ferritic stainless steel specifically engineered for applications requiring economic corrosion resistance, excellent weldability, superior formability, and reliable performance under thermal cycling conditions. Containing approximately 10.50%–11.75% chromium (Cr) with a strictly controlled low carbon content, this material provides suitable oxidation resistance and corrosion performance, making it widely applicable for automotive exhaust components, mufflers, tailpipes, catalytic converter parts, heat-resistant structural members, and other industrial fields.
SUH409L Stainless Steel plate manufacturer,supplier
Our SUH409L stainless steel plate is widely recognized as a highly cost-effective material for automotive exhaust systems, particularly suited for medium-temperature operating conditions. The No.1 hot-rolled finish is produced through hot rolling, heat treatment, and pickling/descaling processes, featuring a matte and relatively rough surface texture that is ideal for downstream fabrication rather than decorative applications.
GNEE supplies SUH409L hot-rolled No.1 stainless steel plates, sheets, coils, and strips, with customized thickness, width, and length tailored to project requirements. Typical hot-rolled plate specifications generally range in thickness from 2 mm to 35 mm, widths from 1000 mm to 2000 mm, and lengths up to 6000 mm (exact dimensions are subject to final production confirmation). To ensure premium quality, products are supplied with chemical composition analysis, mechanical property testing, dimensional inspection, surface inspection, and EN 10204 3.1 Material Test Certificates (MTC), with third-party inspection available upon request.
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SUH409L stainless steel Specification
SUH409L Equivalent Material
| Standard | Designation |
| JIS | SUH409L |
| UNS / AISI | S40910 / 409L |
| EN / DIN | 1.4512 / X2CrTi12 |
| GB (China) | 022Cr11Ti |
| ASTM (plate) | A240 Type 409L |
Chemical Composition (wt. %)
| Element | C | Si | Mn | P | S | Cr | Ti | N |
| Standard (JIS) | ≤ 0.030 | ≤ 1.00 | ≤ 1.00 | ≤ 0.040 | ≤ 0.030 | 10.50–11.70 | 6×(C+N) ~ 0.75 | ≤ 0.030 |
| Typical Value | 0.012 | 0.50 | 0.45 | 0.025 | 0.002 | 11.20 | 0.25 | 0.010 |
409L Stainless Steel Plate Properties
| Spec | Grade | Mechanical Property | Physical Property | ||||
|
Y.S (N/MM2) |
T.S (N/MM2) |
EL (%) |
HRB |
Specific Heat (J/gºC) |
Modulus of Elasticity (KN/mm2) | ||
| JIS | SUH409L | ≥175 | ≥360 | ≥25 | ≤80 | 0.46 | 200 |
JIS G4304 Dimensional Tolerances (Hot-Rolled)
Thickness Tolerances
Thickness tolerance varies based on both the nominal thickness and the width of the plate. Values are in millimeters (mm).
| Nominal Thickness (t) | Width < 1000 | 1000 ≤ Width < 1250 | 1250 ≤ Width < 1600 | 1600 ≤ Width < 2000 | 2000 ≤ Width < 2500 |
| 2.00 ≤ t < 2.50 | ± 0.25 | ± 0.25 | ± 0.30 | - | - |
| 2.50 ≤ t < 3.15 | ± 0.30 | ± 0.30 | ± 0.35 | - | - |
| 3.15 ≤ t < 4.00 | ± 0.35 | ± 0.35 | ± 0.40 | ± 0.45 | - |
| 4.00 ≤ t < 5.00 | ± 0.45 | ± 0.45 | ± 0.50 | ± 0.55 | ± 0.60 |
| 5.00 ≤ t < 6.30 | ± 0.55 | ± 0.55 | ± 0.60 | ± 0.65 | ± 0.70 |
| 6.30 ≤ t < 10.0 | ± 0.60 | ± 0.60 | ± 0.65 | ± 0.70 | ± 0.75 |
| 10.0 ≤ t < 16.0 | ± 0.65 | ± 0.65 | ± 0.70 | ± 0.75 | ± 0.85 |
| 16.0 ≤ t < 25.0 | ± 0.75 | ± 0.75 | ± 0.80 | ± 0.90 | ± 1.00 |
| 25.0 ≤ t < 40.0 | ± 0.90 | ± 0.90 | ± 1.00 | ± 1.10 | ± 1.20 |
| 40.0 ≤ t < 63.0 | ± 1.10 | ± 1.10 | ± 1.20 | ± 1.30 | ± 1.40 |
| 63.0 ≤ t ≤ 100.0 | ± 1.40 | ± 1.40 | ± 1.50 | ± 1.60 | ± 1.70 |
Width Tolerances
Width tolerances depend on the edge condition (Mill Edge vs. Cut Edge).
| Edge Condition | Width (W) | Tolerance (mm) |
| Mill Edge | All Widths | Not specified (Usually +25mm / -0) |
| Cut Edge (Sheared/Gas Cut) | W ≤ 1250 | +10 / -0 |
| 1250 < W ≤ 2500 | +15 / -0 | |
| W > 2500 | +20 / -0 |
Length Tolerances
Applies to cut-to-length plates and sheets.
| Nominal Length (L) | Tolerance (mm) |
| L ≤ 3500 | +20 / -0 |
| 3500 < L ≤ 6000 | +30 / -0 |
| L > 6000 | +[0.5% × L] / -0 |
What is the difference between SUH409L and standard 409 or 409L?
SUH409L is produced according to the JIS G4312 standard (heat-resisting steel), whereas 409/409L typically follows the ASTM A240 standard (pressure vessels and general stainless steel).
The chemical compositions of the three are very similar. The suffix "L" stands for "Low Carbon," which gives it better weldability and formability compared to standard 409. In most automotive exhaust system applications, SUH409L and 409L are interchangeable.
SS SUH409L Sheet Applications
Automotive Exhaust Systems: Manifolds, exhaust pipes, catalytic converter shells, and mufflers.
Heat Exchangers: Tubes and furnace parts.
Agricultural Equipment: Spreaders and components exposed to mild heat/corrosion.
Industrial Silencers: For power generation or heavy machinery.
If you have requirements for SUH409L stainless steel plates, please contact us promptly; we can provide various surface finishes, including 1D, 2B, 2D, and more.
Quality Control
All plates undergo 100% PMI spectral re-inspection, ultrasonic non-destructive testing, and mechanical property verification prior to shipment. Standard orders can be dispatched within 3–7 days, while lead times for custom shapes or large-volume orders are reliably maintained at 15–20 days. We also provide advanced processing services, including high-precision plasma and flame cutting, waterjet circle cutting, bending, and bevelling.
GNEE PACKAGING AND SHIPPING
GNEE packages SUH409L Hot Rolled No.1 Stainless Steel Plates with waterproof paper, protective film and steel strapping, secured on fumigated wooden pallets for export. Plates are protected against moisture, scratches and deformation during transportation and can be customized for container or bulk shipment requirements.
FAQ
What is the maximum temperature SUH409L can withstand?
Oxidation resistance: SUH409L can withstand temperatures of approximately 600°C–650°C during continuous service.
Intermittent service: It can withstand oxidation at temperatures up to approximately 815°C during intermittent heating/cooling cycles.
Note: Exceeding this temperature reduces the material's resistance to oxide scale spalling, leading to material thinning and failure.
Is SUH409L magnetic?
Yes. SUH409L is a ferritic stainless steel and is strongly magnetic. This property allows for quick differentiation from the 300 series (which is non-magnetic).
What welding consumables should be used for SUH409L?
Welding like materials: Use 409 or 409Ti welding wire.
Dissimilar materials (e.g., welding 409L to 304): ER309L welding wire is typically used to compensate for differences in metal composition and ensure joint strength.
Which is better: SUH409L or 430 stainless steel?
430 (16–18% Cr): Offers better corrosion resistance than 409L but slightly inferior thermal fatigue resistance.
409L (11% Cr): Despite lower chromium content, titanium (Ti) stabilization ensures more stable performance in welding and thermal cycling environments.
Conclusion: Choose 430 for decorative applications or kitchenware; choose SUH409L for high-temperature exhaust components.
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