what is S30408 N0.1 stainless steel plate？
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what is S30408 N0.1 stainless steel plate?
Standard Thickness Range: 3.0 mm to 30.0 mm
Standard Plate Sizes: 1500 mm × 6000 mm, 1800 mm × 6000 mm, and 2000 mm × 6000 mm
Customization: Tailored cutting services are available to meet specific engineering requirements.
What is S30408 material equivalent to?
S30408 (304) Stainless Steel Plate Specification
| Item | Specification |
| Standard | ASTM A240 / A240M (or GB/T 24511 / GB/T 3280) |
| Grade | S30408 (UNS S30400 / SUS 304) |
| Finish Type | No. 1 Finish (Hot Rolled, Annealed, and Pickled - HRAP) |
| Appearance | Dull, silver-white, non-reflective, and slightly rough texture |
| Common Thickness | Typically ≥ 3.0 mm (0.118") up to 100 mm+ |
| Main Application | Industrial tanks, chemical processing, pressure vessels, and heavy structural parts where aesthetics are not critical |
Chemical Composition (Mass Weight %)
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Nitrogen (N) |
| S30408 | ≤ 0.08 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 0.75 | 18.00 – 20.00 | 8.00 – 10.50 | ≤ 0.10 |
Mechanical Properties (At Room Temperature)
| Property | Metric Value | Imperial Value | Test Method |
| Tensile Strength (min) | 515 MPa | 75 ksi | ASTM E8 |
| Yield Strength (0.2% Offset, min) | 205 MPa | 30 ksi | ASTM E8 |
| Elongation (in 50mm, min) | 40% | 40% | ASTM E8 |
| Hardness (Rockwell B, max) | 92 HRB | 92 HRB | ASTM E18 |
| Hardness (Brinell, max) | 201 HBW | 201 HBW | ASTM E10 |
S30408 NO.1 vs.2B ：Key differences
| Item | S30408 NO.1 | S30408 2B |
|---|---|---|
| Production Process | Hot rolling + annealing & pickling (HRAP) | Cold rolling + annealing & pickling + skin pass bright finishing |
| Thickness Range | Heavy gauge plates, ≥ 3 mm | Mainly thin gauge sheets, 0.3 – 3.0 mm |
| Surface Finish | Rough matte surface, Ra 3.0 – 6.0 μm | Silver-gray semi-bright surface, Ra 0.1 – 0.5 μm |
| Typical Applications | Industrial structures, pressure vessels, chemical equipment | Decoration panels, stamping parts, kitchen & bathroom products, precision components |
What is the difference between S30408 and standard 304?
From a technical standpoint, the two are virtually identical. S30408 is the unified numerical designation used in Chinese standards GB/T 24511 (for pressure equipment) and GB/T 3280; it corresponds to UNS S30400 (i.e., ASTM 304).
The main difference is that S30408 typically has stricter requirements regarding trace elements; furthermore, if a pressure vessel (such as a boiler or storage tank) is manufactured in accordance with Chinese GB standards, the S30408 grade must be used.
Applications of S30408 No. 1 Stainless Steel Plate
Chemical storage tanks, reactor vessel shells, and heat exchanger base plates
Sewage treatment tanks and flue-gas desulfurization (FGD) tower linings
Boiler bodies and high-temperature piping shields
Food and pharmaceutical equipment frames and conveyor platforms
S30408 Stainless Steel Plate Price List
| Material Grade | Thickness (mm) | Uncut Plate Weighted Price (CNY/ton) | Cut Edge Plate Weighted Price (CNY/ton) |
|---|---|---|---|
| S30408 / NO.1 Hot Rolled | 3 | 14400 | 14480 |
| S30408 / NO.1 Hot Rolled | 4 | 14400 | 14480 |
| S30408 / NO.1 Hot Rolled | 5 | 14400 | 14480 |
| S30408 / NO.1 Hot Rolled | 6 | 14400 | 14480 |
| S30408 / NO.1 Hot Rolled | 8 | 14400 | 14480 |
| S30408 / NO.1 Hot Rolled | 10 | 14400 | 14480 |
| S30408 / NO.1 Hot Rolled | 12 | 14400 | 14480 |
| S30408 / NO.1 Hot Rolled | 14 | 14450 | 14530 |
| S30408 / NO.1 Hot Rolled | 16 | 14450 | 14680 |
S30408 Stainless Steel Plate Supplier
GNEE operates fully equipped processing centers to offer a comprehensive range of services:
- Cutting: Laser cutting, plasma cutting, and waterjet cutting (specifically optimized for No.1 heavy plates).
- Surface Treatment: In addition to the standard No.1 finish, we provide customized finishes including 2B, No.4, brushed/hairline, and mirror (8K) finishes.
- Forming: Bending and rolling (ideal for the pre-processing of pressure vessel tank bodies).
Bending and rolling
Surface Treatment
Standard Stock Items: Constant inventory is maintained for common specifications (e.g., thickness 3mm–20mm, width 1500mm/2000mm).
Delivery: Products can be dispatched from the warehouse and ready for shipment within 3 to 7 working days upon receipt of the advance payment or Letter of Credit (L/C).
Customized / Special Specifications: Production scheduling orders must be placed directly with the steel mills for plates requiring extra width, extra thickness, or specific tolerance standards.
Delivery: The lead time is typically around 15 to 30 working days.
- MTC (Material Test Certificate): Provides material test certificates compliant with EN 10204 3.1 or 3.2 standards, covering comprehensive chemical composition (Cr, Ni, C, N, etc.) and mechanical properties (yield strength, tensile strength, elongation, and hardness).
- Physical Testing:
- Ultrasonic Testing (UT): For heavy plates used in pressure vessels, UT can be performed upon request (in accordance with standards such as GB/T 2970 or ASTM A578) to ensure internal defect-free quality.
- Intergranular Corrosion (IGC) Test: Ensures the material maintains excellent corrosion resistance post-welding.
- GNEE Internal Inspection: Prior to dispatch, our quality inspectors conduct a rigorous final verification on each batch, checking flatness, diagonal tolerance, and edge burrs.
GNEE implements rigorous export seaworthy packaging standards to protect S30408 plates from scratches or corrosion during transit:
- No.1 Industrial Plate Packaging: Wrapped in waterproof paper and securely fastened to wooden pallets or steel skids with heavy-duty metal strapping. Protective corner guards are installed on all edges.
- Cold-Rolled Plate (2B/Brushed) Packaging: Surfaces are covered with protective PE film or specialized laser-cutting film to prevent scratching, and the entire consignment is packed into robust wooden cases or reinforced steel frames.
- Container Securing: For heavy plates, professional cargo lashing and bracing are performed inside the container to prevent any shifting caused by ocean transit movements.
