Difference between SS304 and SS316 round bars
The main differences between SS304 and SS316 round bars lie in their corrosion resistance, cost, and composition. SS316 contains molybdenum, giving it excellent corrosion resistance, especially in chloride environments, making it ideal for marine or harsh applications. SS304 is more economical, offers excellent corrosion resistance in less demanding indoor or dry environments, and has better weldability.
Will 316 stainless steel rust?
Yes, 316 stainless steel can rust, but it is much more corrosion-resistant than other types of steel. Its excellent corrosion resistance is attributed to the addition of molybdenum, but it is not completely rust-proof; under certain conditions, such as prolonged exposure to salt water or acidic environments, corrosion will still occur.
What is a 304 stainless steel round bar?
A 304 stainless steel round bar is a long, cylindrical metal bar with a wide range of applications across various industrial and commercial sectors. Shafts are its most common application. 304 stainless steel round bars are made of stainless steel containing 18% chromium and 8% nickel. The tensile strength of a 304 stainless steel round bar is 75 Ksi, and its yield strength is 30 Ksi (0.2% yield strength). In terms of mechanical properties, the density of a 304 stainless steel round bar is 8.0 g/cm³, and its melting point is 1400 ℃ (2550 ℃F).
Common applications for 304 stainless steel round bars include: supports, decorative parts, shafts, brackets, pins, and locating pins. 304 stainless steel round bars are ideal when strength, electrical conductivity, corrosion resistance, and spark resistance are required. Polished 304 stainless steel round bars are easy to machine and have a good luster.
What is a 316 stainless steel round bar?
316 stainless steel round bars (SS 316 bars) are a molybdenum-containing austenitic stainless steel with superior resistance to pitting and crevice corrosion compared to ordinary chromium-nickel austenitic stainless steels (such as 304 stainless steel).
SS 316 round bars are primarily used in marine applications. The microstructure of 316 stainless steel round bars is similar to that of 304 stainless steel round bars. Adding 2-3% molybdenum can improve the steel's resistance to pitting and crevice corrosion, as well as its weldability.
SS 304 chemical composition
| 304 | 304N | 304LN | |
|---|---|---|---|
| 8 – 11 | 8 – 11 | 8 – 11 | |
| 18 – 20 | 18 – 20 | 18 – 20 | |
| C | 0.08 max | 0.08 max | 0.035 max |
| 0.75 max | 0.75 max | 0.75 max | |
| 2 max | 2 max | 2 max | |
| P | 0.040 max | 0.040 max | 0.040 max |
| S | 0.030 max | 0.030 max | 0.030 max |
| N | 0.10 – 0.16 | 0.10 – 0.16 | |
304 stainless steel mechanical properties
| Stainless Steel Gr. | 304 |
| Rockwell B (HR B) max. | 92 |
| Brinell (HB) max. | 201 |
| Tensile Strength min. (MPa) | 515 |
| Yield Strength 0.2% Proof min. (MPa) | 205 |
| Elongation min. (% in 50mm) | 40 |
| - |
316 stainless steel chemical composition
| ASTM A312 | C | P | S | N | ||||||
| 316 | min. | - | - | - | - | - | 16.0 | 2.0 | 10.0 | - |
| max. | 0.08 | 2.0 | 0.75 | 0.045 | 0.03 | 18.0 | 3.0 | 14.0 | 0.10 | |
316 stainless steel yield strength and mechanical properties
| 316 | Yield Strength 0.2% Proof minimum (MPa) | 205 | |
| 515 | Elongation minimum (% in 50mm) | 40 | |
| 95 | 217 |
✅ Large stock of 304/316 stainless steel strip/coil, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), Chemical Composition Certificate, and Mechanical Properties Certificate.
✅ Value-added services: Slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documentation.
Email: ru@gneesteelgroup.com
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
