- sales@bosegapipes.co.za
- Cape Town, South Africa
Home > Stainless Steel > Stainless Steel 321 and 321H Instrumentation Tubing
Bosega Pipes and Tubes is a reputable manufacturer and supplier located in Cape Town, South Africa, specializing in top-notch Super Duplex Steel Tubing. Known for providing high-performance piping solutions, Bosega caters to a wide range of industries with products that are celebrated for their durability, corrosion resistance, and strength. With a strong focus on quality and customer satisfaction, Bosega Pipes and Tubes offers tailored Super Duplex Steel Tubing that complies with both international and local industry standards. Thanks to their advanced manufacturing techniques and strict quality control measures, they have become a go-to partner for critical applications in tough and demanding environments.
Stainless Steel 321 and 321H Instrumentation Tubing contain mainly chromium (18-20%) and nickel (9-12%), titanium is added to harden against carbide precipitation These alloys exhibit good mechanical properties, with high strength tensile strength (up to 750 MPa) along with good quality and ductility, making them suitable for high temperature applications The advantage of 321 and 321H tubing is excellent resistance to oxidation and corrosion, especially in acidic environments. The integrity of the structures is maintained at extreme temperatures, ensuring reliability and durability in equipment use, making them ideal for the aerospace, chemical and oil industries.
| Grade | Range | Ni | Cr | P | Fe | C | Mn | N | Si | S | Ti |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 321 | Min. | 9.0 | 17.0 | 0 | 65.045 | – | – | – | – | – | – |
| Max. | 12.0 | 19.0 | 0.045 | – | 0.08 | 2.0 | 0.10 | 1.0 | 0.030 | 5(C+N) -0.70 | |
| 321H | Min. | 9.0 | 17.0 | – | 65.25 | 0.04 | – | – | – | – | – |
| Max. | 12.0 | 19.0 | 0.045 | 0.010 | 2.00 | 0.10 | 1.00 | 0.030 | 4(C+N) -0.70 |
| Grade | Tensile Strength min (MPa) | Yield Strength 0.2% Proof min (MPa) | Hardness | Elongation (% in 50mm) min | |
|---|---|---|---|---|---|
| Brinell max (HB) | Rockwell B max (HR B) | ||||
| 321/321h | 515 | 205 | 217 | 95 | 40% |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Super Duplex Steel Tubing is mainly made up of about 25% chromium, 7% nickel, 4% molybdenum, along with trace amounts of nitrogen and manganese, resulting in a well-balanced austenitic-ferritic microstructure. This dual-phase design grants it impressive strength and outstanding resistance to stress corrosion cracking, pitting, and crevice corrosion. Its mechanical properties boast a high tensile strength of around 750 MPa and a yield strength of about 550 MPa, with elongation values typically exceeding 25%. The tubing also shows good weldability and toughness, even in sub-zero temperatures, making it perfect for challenging operational settings.
Bosega Pipes and Tubes, one of the largest suppliers of Stainless Steel 321 and 321H Instrumentation Tubing in Cape Town, South Africa, offers a comprehensive range of high-quality pipes and tubes suitable for various industrial applications. Their extensive inventory and commitment to exceptional service make them a go-to choice for stainless steel products in the region.
| Grade | UNS No | Old British | Euronorm | Japanese JIS | Swedish SS | GOST | ||
|---|---|---|---|---|---|---|---|---|
| BS | En | No | Name | |||||
| 321 | S32100 | 321S31 | X6CrNiTi18-10 | 1.4541 | – | SUS 321 | 2337 | – |
| 321h | S32109 | 321S51 | X10CrNiTi18-10 | 1.4878 | – | SUS 321h | – | – |
Yes, we offer custom sizes for Stainless Steel 321 and 321H Instrumentation Tubing to meet your specific requirements. Our team at Bosega Pipes and Tubes is committed to providing tailored solutions for all your Piping & tubing needs. For more details, contact us at sales@bosegapipes.co.za.
Bosega Pipes and Tubes’ Super Duplex Steel Tubing is widely utilized across various high-demand sectors due to its remarkable corrosion resistance and mechanical strength. It’s commonly found in offshore oil and gas platforms, desalination plants, chemical processing industries, and marine environments where resistance to chloride-induced corrosion is essential. Power generation plants, structural applications, heat exchangers, and pressure vessels also reap the benefits of its durability and performance under extreme conditions. The tubing’s versatility, long service life, and low maintenance needs make it a smart choice for modern infrastructure and critical engineering systems.
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