It is manufactured through cold drawing or hot rolling processes and available in both seamless and welded types.
| Element | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni | N ≤ |
|---|---|---|---|---|---|---|---|---|
| Content (%) | 0.03 | 1 | 2 | 0.035 | 0.03 | 18.0–20.0 | 8.0–12.0 | 0.1 |
Density: 7.93 g/cm³ (same as 304), convenient for structural weight calculation.
Melting Point: 1398–1454°C, stable for continuous service between –196°C and 800°C, suitable for cryogenic tanks and medium-temperature pipelines.
Thermal Conductivity: 16 W/(m·K) at 20°C; thermal expansion coefficient: 17.2×10⁻⁶/°C (0–100°C). Good thermal compatibility with carbon steel and concrete, minimizing thermal stress during installation.
Magnetism: Non-magnetic in the solution-annealed condition; slight magnetism may appear after cold working, without affecting use in food or electronics industries.
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength | ≥480 MPa | GB/T 228.1-2021 |
| Yield Strength | ≥175 MPa | GB/T 228.1-2021 |
| Elongation | ≥40% | GB/T 228.1-2021 |
| Brinell Hardness | ≤187 HB | GB/T 231.1-2009 |
Corrosion Resistance: In a 3.5% NaCl salt spray test, no rust spots after 500 hours. In 5% citric acid at 25°C, corrosion rate ≤0.01 mm/year. Suitable for food contact and drinking water pipelines (compliant with GB 4806.9-2016).
Intergranular Corrosion Resistance: Tested per GB/T 4334.5-2015 with no intergranular cracking, ideal for welded piping systems.
| Type | Outer Diameter (mm) | Wall Thickness (mm) | Tolerance | Length (m) |
|---|---|---|---|---|
| Cold Drawn Seamless Pipe | 6–219 | 1.0–20 | OD ±0.1 mm, WT ±10% | 3/6 (fixed length) |
| Hot Rolled Seamless Pipe | 219–630 | 5.0–30 | OD ±0.2 mm, WT ±12% | 5–7 (random length) |
| Type | Outer Diameter (mm) | Wall Thickness (mm) | Tolerance | Length (m) |
|---|---|---|---|---|
| Straight Seam Welded Pipe | 19–1220 | 1.0–10 | OD ±0.5 mm, WT ±15% | 6 (fixed length) |
| Spiral Welded Pipe | 219–2000 | 5.0–20 | OD ±1.0 mm, WT ±12% | 12 (fixed length) |
Stainless Steel Plate Bending/Stamping Process
Stainless Steel Plates on Storage Rack
Palletized Stainless Steel Plates
Stainless Steel Plate Rolling Line
Precision Thickness Inspection of Stainless Steel Plate
Forklift Loading Stainless Steel Plates for Shipment
Specification: Seamless Pipe Φ32×3 mm
Description: 304L cold drawn seamless pipes used in milk transfer pipelines at a dairy plant. Acid pickled and passivated for GMP compliance. Walmay delivered 6 m fixed-length pipes in 20 days.
Specification: Welded Pipe Φ50×2 mm
Description: 304L straight seam welded pipes with HL brushed finish used for façade support in a commercial complex. Walmay supplied 12 m pipes to minimize joints.
Specification: Seamless Pipe Φ89×5 mm
Description: Hot rolled 304L seamless pipes applied in solvent pipelines of a chemical plant. Pressure tested at 1.6 MPa with no leakage, with full traceability reports.
Specification: Welded Pipe Φ219×8 mm
Description: 304L spiral welded pipes used in secondary water supply projects. Superior corrosion resistance versus galvanized pipes. Walmay supplied 50 tons within 30 days.
Walmay will help match the right stainless product form and specification for your application, confirm quantities and packing needs, and provide requested documents based on order requirements.
