Semih Metals, based in Istanbul, Turkey, is a trusted name in the manufacturing and supply of Duplex Steel hollow bars, providing robust and corrosion-resistant solutions tailored for challenging engineering tasks. The company has built a reputation for delivering products that adhere to strict global standards, catering to a diverse array of industries such as oil and gas, chemical processing, marine, and offshore construction. With a focus on precision manufacturing and deep material knowledge, Semih Metals offers Duplex hollow bars that guarantee structural integrity, longevity, and dependable performance even under high pressure.
Duplex Steel is a unique blend of stainless steels that features roughly equal parts of austenite and ferrite phases, resulting in a well-rounded mix of strength and resistance to corrosion. Common grades like Duplex 2205 (UNS S32205) typically include about 22% chromium, 5–6% nickel, 3% molybdenum, and nitrogen, which enhances their resistance to pitting and crevice corrosion. The mechanical properties are impressive, showcasing high yield strength (usually around 450–550 MPa), tensile strength that surpasses 620 MPa, and elongation rates of 25–30%. Additionally, they exhibit excellent fatigue and stress corrosion resistance. The hollow bar design facilitates efficient machining of components with internal features, minimizing material waste and reducing machining time.
Standards : EN, DIN, JIS, ASTM, BS, ASME, AISI
Size : 10 mm To 100 mm Dia in
Length : 100 mm TO 6000 mm Length.
Specifications : ASTM A276, A479 / ASME SA276, SA479
Form : Hollow
Finish : Bright, Polish & Black
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 2.50 – 3.50 | 4.50 – 6.50 | 0.8 – 0.20 | 63.54 min |
| S31803 / S32205 | Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 80000 , MPa – 550 | Psi – 116000 , MPa – 800 | 15 % |
Yes, Duplex Steel Hollow Bars can be recycled after use. Their high metal content makes them suitable for reuse in various industrial processes, promoting sustainability and resource efficiency.
Yes, Duplex Steel Hollow Bars are suitable for cryogenic applications due to their excellent toughness, strength, and resistance to brittle fracture at extremely low temperatures.
Yes, Duplex Steel Hollow Bars can be used for underground applications due to their high corrosion resistance, strength, and durability, even in harsh and moisture-prone environments.
Duplex Steel hollow bars find extensive use in the production of machined components like shafts, bushings, valve bodies, and couplings, particularly in environments that are harsh and aggressive. Their remarkable resistance to chloride-induced corrosion, cracking, and erosion makes them perfect for applications in offshore platforms, desalination plants, pressure vessels, and chemical processing equipment. The combination of high mechanical strength and outstanding corrosion resistance allows for thinner wall designs, which not only saves material but also enhances overall efficiency.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Semih Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Istanbul, Turkey
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