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Help CenterStainless Steel Round Bar 316L for Marine Hardware, 20mm, 2B Finish, Corrosion Resistant
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Hemaokang Steel (Shandong) Co., Ltd. is proud to offer our premium Stainless Steel Round Bar 316L, specifically engineered for demanding marine hardware applications. With a diameter of 20mm and a 2B finish, this round bar delivers exceptional corrosion resistance against saltwater, humidity, and harsh offshore conditions. As a trusted supplier with ISO9001 certification and an annual export value exceeding US$50 million, we ensure every bar meets rigorous quality standards for long-lasting performance.
Our 316L round bar is the ideal choice for manufacturers of boat fittings, deck hardware, propeller shafts, and offshore structural components. The low carbon content of 316L minimizes carbide precipitation during welding, making it highly suitable for fabrication without compromising corrosion resistance. Combined with a smooth 2B surface finish, this product offers both aesthetic appeal and functional durability.
Key Features & Benefits
- Superior Corrosion Resistance: 316L contains molybdenum (2-3%) which provides excellent resistance to chlorides, making it ideal for marine environments.
- Low Carbon Content (≤0.03%): Reduces the risk of intergranular corrosion during welding, ensuring strong joints.
- 2B Finish: A smooth, bright surface achieved by cold rolling and annealing, followed by light polishing. This finish reduces friction and is easy to clean.
- Precise Dimensional Tolerance: Diameter tolerance meets ASTM A276 standards (±0.05mm for 20mm bar), ensuring consistency in machining.
- Excellent Weldability: Suitable for TIG, MIG, and resistance welding processes without preheating or post-weld heat treatment.
- High Strength & Durability: Tensile strength ≥ 485 MPa, yield strength ≥ 170 MPa, providing reliable mechanical performance under load.
- Wide Temperature Range: Maintains mechanical properties from cryogenic temperatures up to 800°C (intermittent) and 900°C (continuous).
Technical Specifications
| Parameter | Value |
|---|---|
| Material Grade | 316L (UNS S31603) |
| Diameter | 20mm (can be customized) |
| Surface Finish | 2B (Bright, smooth) |
| Length | Standard 6m, custom lengths available |
| Chemical Composition | C ≤0.03%, Si ≤0.75%, Mn ≤2.0%, P ≤0.045%, S ≤0.03%, Cr 16.0-18.0%, Ni 10.0-14.0%, Mo 2.0-3.0% |
| Mechanical Properties | Tensile: ≥485 MPa, Yield: ≥170 MPa, Elongation: ≥40% |
| Density | 8.0 g/cm³ |
| Applicable Standards | ASTM A276, AISI 316L, UNS S31603 |
Why Choose 316L for Marine Hardware?
Marine environments are notoriously aggressive due to high chloride levels, humidity, and UV exposure. 316L stainless steel outperforms 304 and other grades in pitting and crevice corrosion resistance. The 2B finish further reduces the adherence of barnacles and algae, simplifying maintenance. Our round bar is machined to tight tolerances, ensuring smooth fitting into bushings, bearings, and brackets.
Applications include: cleats, hinges, railing posts, propeller shafts, anchor chains, winch drums, and underwater camera housings. With its non-magnetic property (in annealed condition), 316L is also suitable for electronic enclosures near compasses.
As a reliable partner in the global steel industry, Hemaokang Steel (Shandong) Co., Ltd. has been serving clients since 2025 with an annual export turnover of US$50–100 million. Our team of 51–100 skilled professionals ensures strict quality control throughout production. We export to major markets including North America, Europe, Southeast Asia, and Oceania, and hold ISO9001 certification to guarantee consistent product quality.
We offer flexible packaging (bundle wrapping, wooden crates) and fast delivery via sea or air. Custom lengths, additional surface treatments (pickling, passivation), and special certifications (e.g., EN 10204 3.1) are available upon request. Contact us today for a quote or technical consultation.
Frequently Asked Questions
Q1: What is the difference between 316 and 316L stainless steel?
A: The main difference is carbon content. 316L has a maximum of 0.03% carbon, while 316 has up to 0.08%. Lower carbon in 316L reduces the risk of carbide precipitation during welding, making it the preferred choice for welded marine structures.
Q2: Is the 2B finish suitable for outdoor marine use?
A: Yes, the 2B finish is a standard cold-rolled, annealed, and lightly polished surface. It provides good corrosion resistance and is easy to clean. For applications requiring maximum reflectivity, a No. 4 or mirror finish (8K) can be customized.
Q3: Can you supply cut-to-length bars?
A: Absolutely. We can cut the 20mm round bar to any length you need, with tolerances as tight as ±1mm. Please specify your requirement when ordering.
Q4: What packaging do you use for export?
A: Bars are bundled with steel straps, wrapped in water-resistant paper, and then packed in wooden crates or pallets. Additional protection like plastic caps or VCI paper is available for sensitive shipments.
Q5: Do you provide a material test certificate?
A: Yes, we can issue a Mill Test Certificate (MTC) per EN 10204 3.1 or 2.2, showing chemical composition and mechanical properties. This is included with each batch upon request.
Q6: Is this product magnetic?
A: In the annealed condition, 316L is essentially non-magnetic (permeability ≤1.1). Cold working may slightly increase magnetism, but it remains suitable for most marine electronic applications.
Q7: How does this bar compare to 304 stainless steel for marine use?
A: 316L contains molybdenum, which greatly improves resistance to chloride pitting and crevice corrosion. For permanent immersion in seawater or high-chloride atmospheres, 316L is strongly recommended over 304.
Q8: What is the lead time for a standard order?
A: For standard sizes (20mm, 6m length), we typically ship within 7–15 days after order confirmation. Custom orders may take 15–25 days depending on quantity and specifications.
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