1.4404 is a lower carbon grade of 1.4401 steel. It exhibits good acid resistance. It is not susceptible to grain boundary carbide precipitation and therefore is not affected by sensitization. It is primarily used for welded parts thicker than 0.2 inches. The austenitic structure also provides the solid toughness of these stainless grades, also at lower temperatures down to absolute zero (-273 degrees Celsius).
Also known as 316L stainless steel, 1.4404 has a lower carbon content than its family grade 1.4401 steel. Despite its lower carbon content, 1.4404 is very similar to 1.4401 in most commercial and industrial applications. Importantly, the two related grades also cost almost the same, have a long service life, excellent corrosion resistance, and are an excellent choice for stress center type applications.
Chemical composition and physical properties of 1.4401 and 1.4404 stainless steels:
| Property | 1.4401 (316) | 1.4404 (316L) |
|---|---|---|
| Chemical Composition (wt%) | ||
| Carbon (C) | Max 0.08 | Max 0.03 |
| Chromium (Cr) | 16.0 - 18.0 | 16.0 - 18.0 |
| Nickel (Ni) | 10.0 - 14.0 | 10.0 - 14.0 |
| Molybdenum (Mo) | 2.0 - 3.0 | 2.0 - 3.0 |
| Phosphorus (P) | Max 0.045 | Max 0.045 |
| Sulphur (S) | Max 0.030 | Max 0.030 |
| Silicon (Si) | Max 1.0 | Max 1.0 |
| Physical Properties | ||
| Density (g/cm³) | ~7.98 | ~7.98 |
| Melting Point (°C) | 1375-1400 | 1375-1400 |
| Thermal Conductivity (W/m·K) | ~16.3 | ~16.3 |
| Specific Heat Capacity (J/kg·K) | ~500 | ~500 |
| Electrical Resistivity (µΩ·m) | ~72 at 20°C | ~72 at 20°C |
GNEE specializes in the production of high temperature (nickel-based) alloys, austenitic, duplex steel, super austenitic stainless steel and other products.
GNEE is equipped with an annual production line of 45,000 tons of stainless steel seamless pipes (hot perforation, cold drawing, cold rolling), an annual production line of 55,000 tons of welded steel pipes, an annual production line of 30,000 tons of stainless steel heat exchange pipes and an annual production line of 10,000 tons of stainless steel precision coils.
According to customer needs, it can produce ¢6～¢762x 0.5~70mm stainless steel seamless pipes and ¢12~¢3000 x 0.5~80mm stainless steel welded pipes according to GB, ASTM, JIS, DIN and other standards.
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