What are the differences between 304 stainless steel and 316 stainless steel?
What are the differences between 304 stainless steel and 316 stainless steel?
The main difference lies in the fact that 316 stainless steel contains molybdenum, which gives it greater corrosion resistance, especially in chloride-rich environments such as marine environments. Therefore, 316 is a better choice for harsh environments, while 304 is suitable for general indoor and industrial applications and is also cheaper.
What are the uses of 316 stainless steel?
316 stainless steel is widely used in shipbuilding, food processing, chemical and pharmaceutical equipment, automobile manufacturing, and building components where high corrosion resistance and heat resistance are required.
What is 304 stainless steel?
304 stainless steel is an austenitic stainless steel alloy with a high nickel content (8-10.5%), a high chromium content (18-20%), and added manganese, silicon, and carbon. It is widely considered the most widely used austenitic stainless steel.
What is 316 stainless steel?
316 stainless steel, like 304 stainless steel, also has a high nickel and chromium content, and added manganese, silicon, and carbon. The main difference between the two lies in the molybdenum content of the alloy. 316 stainless steel contains 2-3% molybdenum, while 304 stainless steel contains only trace amounts of molybdenum.
304 stainless steel Vs 316 stainless steel Chemical composition
| Grade | C | Si | Mn | P | S | N | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|---|
| 304 | 0.07 | 1.00 | 2.00 | 0.045 | 0.015 | 0.10 | 17.5 - 19.5 | 8.0 - 10.5 | - |
| 316 | 0.07 | 1.00 | 2.00 | 0.045 | 0.015 | 0.10 | 16.5 - 18.5 | 10.0 - 13.0 | 2.0 - 2.5 |
304 vs. 316 stainless steel properties
| Property | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|
| Density | 8.00 g/cm³ | 8.00 g/cm³ |
| Melting Point | 1450 °C | 1370°C – 1450°C |
| Modulus of Elasticity | 193 GPa | 193 GPa |
| Electrical Resistivity | 0.74 x 10⁻⁶ Ω.m | 0.74 x 10⁻⁶ Ω.m |
| Thermal Conductivity | 16.3 W/m·K | 16.3 W/m·K |
| Shear Modulus | 74.0 GPa | 74.0 GPa |
304 vs. 316 stainless steel strength
| Mechanical properties | 304 stainless steel | 316 stainless steel |
|---|---|---|
| Ultimate Tensile Strength | 505 MPa | 550 MPa |
| Tensile Yield Strength | 215 MPa | 240 MPa |
| Hardness (Rockwell B) | 70 | 80 |
| Elongation at break | 70% | 60% |
304 vs. 316 stainless steel differences
| Characteristics | 304 stainless steel | 316 stainless steel |
|---|---|---|
| Corrosion resistance | Excellent | Even better |
| Magnetic | No | No |
| Weldability | High | Good |
| Hardens during cold forming | Yes | Yes |
| Formability | Very good | Good |
| Machinability (annealed) | Fair, but better than 316 | Fair |
| Resists elevated temperatures | High | High |
| Maximum intermittent service temperature | 850°C | 850°C |
Applications of 304 stainless steel
Most applications of 304 stainless steel are attributed to its high chromium content, which gives the alloy excellent corrosion resistance. These applications include:
• Manufacturing kitchen appliances such as refrigerators and dishwashers
• Manufacturing heat exchangers
• Manufacturing commercial food processing equipment and kitchen accessories, such as sinks and backsplashes
• Manufacturing pans, cutlery, and knives and forks
• Building paneling
• Manufacturing nuts, bolts, and screws
• Manufacturing equipment for brewing, food, and pharmaceutical production
Generally, stainless steel is used in applications where ordinary carbon steel would corrode.
Applications for 316 Stainless Steel
316 stainless steel was originally developed for paper mills. Now, it is widely used in a variety of fields, including:
· Manufacturing of equipment for food, chemical, and petroleum production and processing
· Manufacturing of laboratory workbenches and equipment
· Building paneling in coastal areas
· Marine fittings
· Mining screens
· Kitchenware, sanitary ware, and sinks
· Piping
· Medical implants
316 stainless steel has better corrosion resistance than ordinary stainless steel and typically exhibits higher strength at high temperatures.
Gnee Steel specializes in the production of a wide range of stainless steel products. Gnee Steel's product packaging includes: Steel Strapping: Pipes with an outer diameter of 3 inches or less are typically strapped together with polypropylene film to prevent rust during ocean shipping, and then secured with steel strapping. Wooden Cases/Crates: Pipes are typically packaged in wooden cases or crates to protect the pipes during transportation, especially those that are longer or have larger diameters. Seaworthy Export Packaging: Suppliers typically use standard seaworthy export packaging methods, which may include a variety of materials and techniques to protect the pipes during transportation. Tarpaulin Packaging: This prevents rain, seawater, and other external factors from penetrating the export crates during transportation. Gnee Steel specializes in the production and sale of alloy materials. Gnee Steel's products are widely used in the aerospace, chemical, power, automotive, and nuclear energy sectors, and we can provide customized alloy material solutions based on customer needs. For alloy material pricing or customized alloy material solutions, please contact us for a quote: ru@gneesteelgroup.com