AISI 309S Stainless Steel Plate Price Per kg 2026
Sep 20, 2026
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If you are looking for AISI 309S stainless steel plate price per kg in 2026, this guide provides updated price ranges, cost factors, material characteristics, and purchasing advice. AISI 309S (UNS S30908) is a low-carbon heat-resistant austenitic stainless steel containing approximately 22–24% chromium and 12–15% nickel, widely used in furnaces, heat exchangers, kilns, combustion equipment, and high-temperature industrial applications.
The actual price of 309S stainless steel plate depends on nickel and chromium market trends, plate thickness, surface finish, production method, order quantity, certification requirements, and supplier origin. For international buyers, FOB China pricing is usually more competitive than local distributor prices.
What Is AISI 309S Stainless Steel Plate?
AISI 309S stainless steel plate is a heat-resistant austenitic stainless steel plate designed for applications requiring better oxidation resistance and high-temperature strength than standard 304 stainless steel.
Compared with 304 stainless steel, 309S contains higher chromium and nickel content, providing improved resistance to oxidation, carburization, and thermal cycling. Compared with 310S stainless steel, 309S offers a more economical solution when extreme temperature performance is not required.
AISI 309S Stainless Steel Plate Manufacturing Process
Steel melting → Continuous casting → Hot rolling → Heat treatment → Pickling → Cold rolling → Surface finishing → Cutting → Inspection → Packaging
AISI 309S Stainless Steel Plate Price Per Kg 2026 (FOB China )
In 2026, the typical international price range for AISI 309S stainless steel plate is approximately:
| Product Type | Thickness | Surface | Estimated FOB Price |
|---|---|---|---|
| 309S Hot Rolled Plate | 4–60 mm | No.1 | $2.5–4.0/kg |
| 309S Cold Rolled Plate | 0.8–6 mm | 2B / BA | $3.0–4.8/kg |
| 309S Polished Plate | 1–6 mm | No.4 / HL / Mirror | $3.5–5.5/kg |
| 309S Custom Cut Plate | Customized | Various | $3.0–6.0/kg |
Market quotations vary depending on nickel prices, mill capacity, and regional demand. Some market references place 309S stainless steel plate around $2.5–4.5/kg, while specialized finishes or smaller quantities can reach higher levels.
Four Key Factors Affecting the Price of AISI 309S
Metal Alloy Costs:
309S contains up to 12.0%–15.0% nickel (Ni) and 22.0%–24.0% chromium (Cr). The unit price per kilogram is highly sensitive to LME Nickel market trends, with alloy surcharges accounting for 60%–70% of the base pricing.
Cold-Rolled vs. Hot-Rolled Processing Costs:
Due to the requirement for multiple passes of precision rolling, annealing, and pickling, the processing cost for cold-rolled sheet (2B finish) is $0.30–$0.50/kg higher than that for hot-rolled industrial-grade (No. 1 finish) medium-to-heavy plate.
Pricing Differences: "Theoretical Weight" vs. "Actual Scale Weight":
When calculating theoretical weight using the physical density of 309S (7.98 g/cm³), the presence of manufacturing tolerances (specifically negative tolerances or "undersize" allowances) means that the actual cost per kilogram-derived from the theoretical unit price-must be adjusted to account for the specific tolerance variance.
Procurement Scale and Logistics Consolidation:
Full Container Load (FCL) procurement (e.g., over 20 metric tons) results in lower allocated logistics costs, and suppliers can typically offer tiered volume discounts ranging from $0.15 to $0.25/kg.
309S Stainless Steel Plate Weight and Cost Estimation Chart (Calculated per Square Meter and per Kilogram)
To help procurement managers quickly estimate material weight, bidding costs, and logistics expenses, the following table calculates the theoretical weight of AISI 309S stainless steel plate based on a standard density of 7.98 g/cm³. The cost estimation is calculated using an average reference price of USD 3.50/kg.
| Plate Thickness | Theoretical Weight per m² (kg/m²) | Weight per Standard Plate (1.5m × 6.0m) | Estimated Cost per m² (USD/m²) |
|---|---|---|---|
| 2.0 mm | 15.96 kg/m² | 143.64 kg | ≈ $55.86 / m² |
| 5.0 mm | 39.90 kg/m² | 359.10 kg | ≈ $139.65 / m² |
| 10.0 mm | 79.80 kg/m² | 718.20 kg | ≈ $279.30 / m² |
| 20.0 mm | 159.60 kg/m² | 1,436.40 kg | ≈ $558.60 / m² |
309S Stainless Steel Plate Calculation Formula:
Weight (kg/m²) = Thickness (mm) × Density (kg/m³) × 0.001
Cost per m² = Weight per m² × Stainless Steel Price (USD/kg)
Example:
For a 5 mm thick 309S stainless steel plate:
Weight = 5 × 7.98 = 39.90 kg/m²
Material cost = 39.90 × $3.50/kg = $139.65/m²
This calculation helps buyers estimate total project material requirements, container loading weight, and approximate purchasing budgets before requesting a formal quotation.
Why is the price per kilogram of AISI 309S higher than that of 304L and 316L?
This is because the chromium and nickel content in 309S is significantly higher than in 304L (18% Cr/8% Ni) and 316L (16% Cr/10% Ni/2% Mo). This elevated chromium-to-nickel ratio ensures oxidation resistance at high temperatures of up to 1,000°C; since material costs rise with the content of these alloying elements, the price per kilogram is approximately 15%–25% higher than that of 316L.
Which is more cost-effective: purchasing by the kilogram or by the sheet?
For industrial bulk procurement, pricing by the kilogram (or ton) is the standard international practice and the fairest approach, given the thickness tolerances inherent in steel plate production. Pricing by the sheet often incorporates a risk premium factored in by the supplier, whereas settling based on actual weight (kg) ensures you pay only for the exact amount purchased, offering greater transparency.
Purchasing Recommendations
The 2026 price of AISI 309S stainless steel plate is primarily determined by raw material alloy costs, manufacturing processes, plate specifications, certification requirements, and order volume. When purchasing, buyers should look beyond the unit price (price per kilogram) and evaluate the supplier's overall capabilities, material traceability, inspection standards, and delivery reliability.
For industrial applications requiring operation at high temperatures of approximately 1000°C, 309S stainless steel plate offers an optimal balance between performance and cost compared to 304 and 310S grades.
To provide a more accurate quote, could you please let me know:
The required plate thickness and dimensions?
The target order quantity (in kilograms or tons)?
And the preferred surface finish (e.g., 2B, No.1)?
AISI 309S Stainless Steel Plate Suppliers and Manufacturers
GNEE provides AISI 309S stainless steel plates according to ASTM A240 / ASME SA240 standards, including UNS S30908, SUS309S, and EN 1.4833 equivalent grades. We supply hot-rolled and cold-rolled plates with thicknesses from 0.3–100 mm, widths up to 2000 mm, and surfaces including No.1, 2B, BA, No.4, HL, and customized finishes. Each batch can be provided with EN10204 3.1 MTC, chemical composition analysis, mechanical testing, PMI inspection, and full heat-number traceability. With professional cutting, polishing, and customized processing services, GNEE supports global customers in high-temperature industries such as furnaces, petrochemical equipment, heat exchangers, and thermal processing systems.
AISI 309S Stainless Steel Plate Specification
| Property | Description / Requirement |
| Standard | ASTM A240 / A240M, ASME SA-240 |
| Material Grade | AISI 309S (UNS S30908) |
| Product Form | Hot Rolled Plate / Cold Rolled Sheet |
| Surface Finish | No. 1 (Hot rolled, annealed, descaled) |
| Thickness Range | 3mm – 100mm+ (Customizable) |
| Width / Length | Standard (1500x6000mm, 2000x6000mm) or cut-to-size |
| Manufacturing Process | Electric Arc Furnace + AOD Refining |
| Heat Treatment | Solution Annealed (Min 1040°C, air cool or water quench) |
| Edge Condition | Mill Edge / Sheared Edge |
| Certification | Mill Test Certificate (MTC) EN 10204 3.1 |
Chemical Composition - ASTM A240
AISI 309S is a low-carbon version of AISI 309, with the carbon content limited to below 0.08% to minimize carbide precipitation at high temperatures.
| Element | Content (%) |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
(Mechanical Properties - Room Temp)
| Property | Minimum Requirement |
| Tensile Strength | 75 ksi (515 MPa) |
| Yield Strength (0.2% offset) | 30 ksi (205 MPa) |
| Elongation (in 2 in. / 50mm) | 40% |
| Hardness (Brinell) | 217 HBW max |
AISI 309S Stainless Steel Plate Inspection
GNEE performs strict quality inspections for AISI 309S stainless steel plates according to ASTM A240 / ASME SA240 standards. Each batch can be inspected through chemical composition analysis, PMI (Positive Material Identification), tensile strength testing, yield strength testing, hardness testing, thickness tolerance measurement, surface inspection, and ultrasonic testing for heavy plates. All products are supplied with EN10204 3.1 Material Test Certificates (MTC), including heat number traceability, ensuring that chemical and mechanical properties meet customer requirements for high-temperature applications such as furnaces, heat exchangers, and petrochemical equipment.
AISI 309S Stainless Steel Plate Packaging
For international shipment, GNEE uses export seaworthy packaging to protect 309S stainless steel plates during long-distance transportation. Plates are normally wrapped with waterproof paper, PVC protective film (if required), steel straps, and fumigated wooden pallets or reinforced wooden cases. Each package is marked with product grade, size, heat number, quantity, and shipping information for easy identification. The packing method is designed to prevent moisture, corrosion, surface scratches, and deformation during container loading and ocean transportation.
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