Metinox Overseas is a renowned manufacturer, supplier, stockist, and exporter of ASTM A312 Stainless Steel 321/321H Welded Pipes. Our wide range of ASTM A312 TP 321/321H SS pipes complies with various national and international product quality standards. SS321 is a titanium-based austenitic SS known for its excellent resistance to general corrosion. These pipes, being chromium-nickel alloy with the addition of titanium, exhibit outstanding performance in elevated temperature environments.

The SS 321H Welded Pipes demonstrate equivalent properties to the Stainless Steel 321 Welded Pipes. They possess remarkable resistance against corrosion within the carbide precipitation temperature range from 427 to 816 degrees Celsius, while also maintaining oxidation resistance up to 816 degrees Celsius. Additionally, they offer excellent stress and creep-rupture properties. SS321H, a modification of SS321, is engineered to enhance creep resistance and provide greater strength at temperatures ranging from 537 degrees Celsius.

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Metinox Overseas Stainless Steel 321 Welded Pipes find applications in various industries such as petroleum, chemical, boiler superheater manufacturing, and heat exchanger fabrication. Their high-temperature resistance makes them ideal for fluid transmission in power stations and exhaust purification devices. They are also utilized in construction and for various purposes in the oil refinery, industrial boiler, and chemical processing sectors.

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Our Stainless Steel 321H Welded Pipes are extensively used in oil refinery equipment, industrial boilers, pressure vessel manufacturing, and various chemical processes involving heat exchange. Metinox Overseas Stainless Steel 321 EFW Pipes offer weldability similar to Stainless Steel 304 and 304L, with the added advantage of titanium to prevent carbide precipitation during welding.

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Type 321 pipes are primarily employed in applications requiring heating between 800-1650 Fahrenheit. The annealing process involves heating these Stainless Steel 321H Pipes to 1750°F – 2050°F (954°C – 1121°C), followed by water quenching or air cooling. They can be stress-relief annealed within the sensitization temperature range of 450°C – 800°C without carbide precipitation, thus preventing intergranular corrosion.

Metinox Overseas Stainless Steel 321 Welded Pipes find extensive use in industries such as petrochemicals, natural gas, papermaking, and water processing, among others. They can transport high-temperature liquids and high-pressure gases, offering high tolerance and dimensional stability. These pipes are particularly suitable for aircraft parts like exhaust systems, where operating temperatures exceed 800°F. Although slightly less corrosion-resistant than Alloy 302 or Alloy 304 in the annealed condition, our Stainless Steel 321 Round Pipes offer superior performance in demanding environments.

Metinox Overseas ensures the quality of our Stainless Steel 321 Welded Pipes through rigorous testing conducted by our quality controllers, including flaring tests, flattening tests, positive material tests, third-party inspections, chemical analyses, intergranular tests, Rockwell hardness tests, and mechanical tests. Packaging is carried out meticulously in wooden boxes and crates to safeguard the pipes from unauthorized access during transit. Due to the wide range of widths, thicknesses, and tempers available in our ASTM A312 Stainless Steel 321H Welded Pipes, no flatness tolerances are specified for cold-rolled stainless steel. Similarly, evenness in temper may vary, and it cannot be guaranteed.

Metinox Overseas Stainless Steel 321/321H Welded Pipes are a versatile grade, often supplied in the hardened yet machinable condition, suitable for applications requiring high strength and moderate heat and corrosion resistance.