Harsh Metalloys is a well-known manufacturer and supplier located in Mumbai, India, specializing in high-quality Stainless Steel 321H Pipes that are perfect for high-temperature and corrosive environments. SS 321H is essentially a high-carbon variant of the Titanium-stabilized austenitic stainless steel 321, crafted to enhance creep strength and provide outstanding resistance to intergranular corrosion. These pipes are produced following international standards like ASTM A312 and come in seamless, welded, and ERW options. Thanks to their durability, high-temperature stability, and excellent weldability, SS 321H pipes are commonly used in heat exchangers, boiler components, chemical processing, power plants, and refineries.
When it comes to composition and mechanical properties, Stainless Steel 321H Pipes consist of 17–19% Chromium, 9–12% Nickel, and Titanium for stabilization, featuring a higher carbon content (up to 0.10%) compared to SS 321. This boost in carbon significantly improves high-temperature strength and creep resistance. These pipes deliver tensile strength ranging from 515–750 MPa and yield strength around 205 MPa. They maintain their mechanical integrity at temperatures up to 870°C (1600°F) and show excellent resistance to oxidation, intergranular corrosion, and scaling. In their annealed state, SS 321H pipes are non-magnetic and are ideal for high-pressure, high-temperature applications that demand enhanced durability.
| ASTM Specification | ASME SA 312 /ASTM A312/ TP 321H |
| EFW Pipes Sizes |
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| Wall THK | Schedule 40, Schedule 5, Schedule10, Schedule 160, Schedule 80, Schedule XXS, Schedule 80S, Schedule XS |
| Seamless Pipes Sizes |
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| Welded Pipes Sizes |
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| Forms | ERW / Round, Rectangular |
| techniques | EFW/ Welded /ERW / Seamless / Fabricated / LSAW/ CDW/ Seam-Welded / Redrawn |
| Element | SS 321H |
| Nickel | 09 To 12 |
| sulfur | 00.03 Maximum |
| Nitrogen | 00.10 |
| Chromium | 17 To 19 |
| Silicon | 00.75 Maximum |
| Magnesium | 2 Maximum |
| Carbon | 00.04 To 0.08 |
| Phosphorus | 00.045 Maximum |
| Titanium | 00.70 Maximum |
| Element | SS 321H |
| Tensile Strength | 515 |
| Yield Strength | 205 |
| Elongation | 40 |
| Rockwell | 95 |
| Brinell | 217 |
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At Harsh Metalloys, we are proud to be the largest supplier, manufacturer, and exporter of Stainless Steel 321H Pipes in India, Mumbai. Our cutting-edge solutions cater to all your piping needs. With state-of-the-art production facilities strategically located in the Mumbai, we maintain a vast inventory of over 16,000 tons of premium-quality materials, ensuring we have the stock readily available to meet your demands.
The 321H square pipes are known for their impressive strength and heat resistance, making them a great choice for structural and mechanical uses in high-temperature settings like refineries and heat exchangers.
When it comes to seamless pipes, 321H stands out with its excellent corrosion and creep resistance, making it perfect for high-temperature and pressure situations in industries like petrochemical, power generation, and thermal processing.
The 321H ERW pipes are designed to provide reliable strength and corrosion resistance, making them suitable for low to medium-pressure systems in chemical, construction, and industrial applications.
With 321H LSAW (Longitudinal Submerged Arc Welded) pipes, you can count on strong weld integrity and heat resistance, which are essential for large-diameter, high-temperature applications such as oil and gas pipelines.
The 321H round pipes are celebrated for their outstanding oxidation resistance and mechanical strength, commonly utilized in thermal, automotive, and aerospace sectors for transporting fluids and gases.
Combining heat resistance with durability, 321H welded pipes are perfect for exhaust systems, furnace components, and chemical process piping in high-temperature environments.
Harsh Metalloys is a leading supplier, and stockist of high-quality Stainless Steel 321H Pipes in India, Mumbai. Our products are widely used in various applications, and we are committed to delivering excellent service, resulting in high customer satisfaction. Our unique finishing techniques further distinguish us in the stainless steel industry. We are dedicated to consistently providing superior products and effectively meeting our customer’s needs.
Stainless Steel 321H Pipes are extensively used in applications that demand high strength and corrosion resistance at elevated temperatures. Common uses include superheater and reheater tubes, heat exchangers, chemical processing lines, exhaust systems, and high-temperature boiler components. These pipes are particularly suited for oil and gas refineries, power generation plants, and thermal processing industries. The high carbon content ensures superior creep strength, while titanium stabilization prevents intergranular corrosion post-welding. SS 321H pipes are ideal for continuous and cyclic heating conditions, offering long service life, excellent mechanical performance, and dependable resistance to high-temperature oxidation.
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