ASTM A276 316/316L UNS S31600 S31603 round bar is a type of stainless steel that is widely used in various industries such as chemical processing, food processing, and pharmaceuticals. This type of 1.4401/1.4404 stainless steel is known for its durability, corrosion resistance, and strength.
Chemical Composition & Dual Certification Architecture
The integration of 2.0% to 3.0% Molybdenum (Mo) distinguishes 316/316L round bars from standard 304 grades, drastically improving resistance to localized chloride pitting and crevice corrosion.
Most premium commercial round bar stock is supplied with Dual Certification (316/316L). By maintaining carbon levels strictly below 0.030%, the material minimizes harmful carbide precipitation during welding while maintaining the baseline mechanical properties of Grade 316.
| Chemical Element | Grade 316 (UNS S31600) | Grade 316L (UNS S31603) |
| Carbon (C) | ≤ 0.080% | ≤ 0.030% |
| Molybdenum (Mo) | 2.00% – 3.00% | 2.00% – 3.00% |
| Chromium (Cr) | 16.00% – 18.00% | 16.00% – 18.00% |
| Nickel (Ni) | 10.00% – 14.00% | 10.00% – 14.00% |
| Manganese (Mn) | ≤ 2.00% | ≤ 2.00% |
| Silicon (Si) | ≤ 1.00% | ≤ 1.00% |
Technical Specifications Matrix
| Standard Specification | Grade | UNS Designation | Werkstoff Number |
| ASTM A276 / ASME SA276 | 316 | UNS S31600 | 1.4401 |
| ASTM A276 / ASME SA276 | 316L | UNS S31603 | 1.4404 |
Mechanical Performance Thresholds
ASTM A276 bars undergo rigorous testing to ensure structural structural integrity under heavy torque, tensile load, and pressure boundaries. The mechanical properties vary slightly depending on whether the bar is hot-finished or cold-finished (which introduces work hardening).
| Property Metric (Annealed Condition) | Metric Value (Min) | Imperial Value (Min) |
| Tensile Strength | ≥ 485 MPa | ≥ 70,000 psi |
| Yield Strength (0.2% Offset) | ≥ 170 MPa | ≥ 25,000 psi |
| Elongation (in 50mm / 2 inches) | ≥ 40% | ≥ 40% |
| Hardness Max (Brinell HBW) | ≤ 217 | ≤ 217 |
Common Uses for ASTM A276 UNS S31600 S31603 Round Bars:
1. Chemical Processing
The ASTM A276 316 UNS S31600 round bar is commonly used in chemical processing applications where it can withstand high temperatures and corrosive environments. Its corrosion resistance makes it ideal for handling chemicals, acids, and bases.
2. Food Processing
The ASME SA276 AISI 316 316L round bar is often used in food processing applications due to its non-contaminating properties. Alloy 316 316L high resistance to corrosion and staining makes it ideal for use in equipment that comes into contact with food.
3. Pharmaceuticals
The SS SUS UNS S31600 S31603 round bar is commonly used in the pharmaceutical industry due to its resistance to corrosion and ease of sterilization. It is also used in the manufacture of medical devices due to its biocompatibility.
4. Marine Applications
S31600 round bar rod is often used in marine applications due to its high resistance to saltwater corrosion. ASTM A276 S31600 is commonly used in the manufacture of boat fittings, marine hardware, and other components that are exposed to the saltwater environment.
5. Architecture
The ASTM A276 Grade UNS S31600 S31603 round bar is used in architecture due to its corrosion resistance and durability. It is commonly used in building facades, handrails, and other decorative features.
B2B Supply & Processing Capabilities from HT PIPE
Zhengzhou Huitong Pipeline Equipment Co., Ltd. (HT PIPE) maintains a comprehensive inventory of hot-rolled and cold-drawn ASTM A276 316/316L round bars across an extensive range of diameter sizes.
Processing Capabilities: Precision cut-to-length bandsaw cutting, centerless grinding, custom surface polishing, and thread cutting.
Quality Assurance: All shipments include full material traceability with original Mill Test Certificates (MTC) conforming strictly to EN 10204 3.1, detailing exact chemical heats and mechanical testing.
Global Export Logistics: Rapid ocean container or air freight packing, secure anti-corrosion bundling, and complete international customs clearance documentation.
Accelerate your industrial procurement cycle. Reach out to our technical sales team at market@htpipe.com to request an optimized commercial quotation or dimensional stock list.
