ARK Stainless Inc. is a leading manufacturer and supplier of premium-quality Duplex & Super Duplex Stainless Steel Round Bars & Rods, engineered for high performance in demanding industrial applications. These bars and rods are manufactured using top-grade raw materials and advanced production techniques to ensure superior strength, corrosion resistance, and operational reliability.
Our product portfolio includes Duplex grades like UNS S31803 and S32205, and Super Duplex grades such as UNS S32750 and S32760. These bars and rods are manufactured in compliance with international standards including ASTM A276, ASTM A479, and conform to specifications from ASME, ANSI, and ASTM, ensuring consistent quality and performance across various industries.
The Duplex & Super Duplex Round Bars & Rods offer exceptional resistance to localized corrosion such as pitting, crevice, and stress corrosion cracking, especially in aggressive environments containing chlorides and acids. Their dual-phase microstructure (austenitic and ferritic) imparts excellent mechanical strength and toughness, making them ideal for critical applications in offshore oil & gas, chemical processing, marine, pulp & paper, desalination, and structural components.
Available in a wide range of diameters and lengths, our bars and rods can be supplied in hot-rolled, cold-drawn, and centerless ground finishes to meet diverse project specifications. Precision-engineered for tight dimensional tolerances, these products offer superior surface quality and machinability, facilitating easy fabrication and installation.
Renowned for their high tensile strength, excellent weldability, and durability, our Duplex & Super Duplex Stainless Steel Round Bars & Rods deliver long-lasting performance while reducing overall maintenance costs. At ARK Stainless Inc., we implement stringent quality control and thorough testing to ensure each product exceeds industry expectations in performance and reliability.
| Grade | Common Name | C% | Mn% | Si% | P% | S% | Cr% | Ni% | Mo% | N% | Others |
|---|---|---|---|---|---|---|---|---|---|---|---|
| UNS S31803 | Duplex 2205 | ≤ 0.030 | ≤ 2.00 | ≤ 1.00 | ≤ 0.030 | ≤ 0.020 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.14–0.20 | — |
| UNS S32205 | Duplex 2205 | ≤ 0.030 | ≤ 2.00 | ≤ 1.00 | ≤ 0.030 | ≤ 0.020 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 | — |
| UNS S32750 | Super Duplex 2507 | ≤ 0.030 | ≤ 1.20 | ≤ 0.80 | ≤ 0.035 | ≤ 0.020 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 | Cu ≤ 0.50 |
| UNS S32760 | Super Duplex Zeron 100 | ≤ 0.030 | 0.50–1.00 | ≤ 1.00 | ≤ 0.030 | ≤ 0.010 | 24.0–26.0 | 6.0–8.0 | 3.0–4.0 | 0.20–0.30 | W 0.5–1.0, Cu 0.5–1.0 |
| Grade | Common Name | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (%) | Hardness (HRB) |
|---|---|---|---|---|---|
| UNS S31803 | Duplex 2205 | 620 min | 450 min | 25 min | ≤ 100 |
| UNS S32205 | Duplex 2205 | 620 min | 450 min | 25 min | ≤ 100 |
| UNS S32750 | Super Duplex 2507 | 800 min | 550 min | 15 min | ≤ 100 |
| UNS S32760 | Super Duplex Zeron 100 | 750–930 | 550 min | 25 min | ≤ 97 |
Duplex Steel S31803/S32205 Round Bars & Rods are renowned for their high strength, excellent corrosion resistance, and outstanding performance in aggressive environments. Designed with a balanced ferritic-austenitic microstructure, these bars and rods are ideal for critical components used in industries such as oil & gas, chemical processing, marine engineering, desalination, pulp & paper, and structural applications.
Manufactured using state-of-the-art techniques and stringent quality controls, these round bars and rods undergo mechanical testing, chemical composition verification, ultrasonic examination, and surface integrity inspections. All products are supplied with full traceability and are accompanied by Mill Test Certificates (MTC) in accordance with EN 10204/3.1, Quality Assurance Plans (QAP), and third-party inspection documents, ensuring complete customer confidence and compliance.
| STANDARD | UNS | WNR. |
|---|---|---|
| Duplex S31803 / S32205 | S31803 / S32205 | 1.4462 |
Super Duplex Steel S32750/S32760 Round Bars & Rods are designed to deliver superior performance in the most demanding applications. With enhanced levels of chromium, molybdenum, and nitrogen, these grades provide exceptional resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking. Their high strength and toughness make them a preferred choice in critical sectors including offshore oil & gas, chemical processing, subsea equipment, marine environments, and desalination plants.
These round bars and rods are manufactured under strict supervision using the latest technologies and are tested for mechanical strength, corrosion resistance, and dimensional accuracy. Comprehensive inspection protocols ensure compliance with international quality standards. Each product is delivered with Mill Test Certificates (MTC) in line with EN 10204/3.1, alongside Quality Assurance Plans (QAP), and optional third-party inspections for complete traceability and assurance.
| STANDARD | UNS | WNR. |
|---|---|---|
| Super Duplex S32750 / S32760 | S32750 / S32760 | 1.4410 |
