DIN Standard 1.4401 1.4845 1.4404 1.4301 1.4571 Mirror Polished Stainless Steel Tube.video
DIN Standard 1.4401 1.4845 1.4404 1.4301 1.4571 Mirror Polished Stainless Steel Tube.video
| DIN Number | Equivalent Grade | Key Composition | Mirror Polishing Characteristics | Typical Application Scenarios |
|---|---|---|---|---|
| 1.4301 | 304 | Cr18–20%, Ni8–10% | General-purpose mirror polishing, resistant to atmospheric and fresh water corrosion, surface roughness Ra≤0.2μm, suitable for cost-effective applications. | Food machinery, architectural decoration, general industrial pipelines. |
| 1.4401 | 316 | Cr16–18%, Ni10–14%, Mo2–3% | Molybdenum-enhanced mirror polishing, chloride-resistant (e.g., seawater, hydrochloric acid), dense passivation film after polishing. | Coastal exhaust systems, chemical equipment, medical devices. |
| 1.4404 | 316L | Same as 316 (low-carbon) | Ultra-low carbon mirror polishing, no intergranular corrosion risk after welding, ideal for high-cleanliness requirements. | Pharmaceutical equipment, high-purity gas pipelines, marine engineering. |
| 1.4845 | 310S | Cr24–26%, Ni24–26% | High-temperature mirror polishing, resistant to oxidation at 1150℃ and sulfur-containing exhaust, prevents high-temperature scale spalling after polishing. | High-temperature furnace tubes, incinerator exhaust pipes, aeroengine components. |
| 1.4571 | 316Ti | Same as 316 (with Ti stabilization) | Titanium-stabilized mirror polishing, resistant to intergranular corrosion at high temperatures, surface withstands high-temperature sulfide corrosion after polishing. | Chemical reactors, geothermal pipelines, nuclear industry equipment. |
Mirror polishing process and standards
Polishing method
Mechanical polishing: grinding by cloth wheel or sand belt step by step (such as #500-#3000 mesh), the surface roughness can reach Ra0.1-0.2μm, suitable for simple shapes.
Electrolytic polishing (EP): electrochemical dissolution removes microscopic protrusions, the surface is more uniform, Ra≤0.05μm, suitable for complex pipe fittings.
Chemical polishing: acid corrosion leveling, low cost but poor brightness, ventilation treatment is required.
