Aditya Stainless is a reputable manufacturer and supplier of Stainless Steel 321H Bolts, proudly based in Kolkata, India. These bolts are made from a high-carbon variant of titanium-stabilized austenitic stainless steel, specifically engineered for superior performance in high-temperature settings. SS 321H bolts are known for their remarkable resistance to oxidation, intergranular corrosion, and stress rupture, even at elevated temperatures. Produced in accordance with global standards like ASTM A193 and ASTM A194, our bolts come in various forms, including hex bolts, stud bolts, U-bolts, and anchor bolts, offering robust and dependable fastening solutions for applications in power plants, chemical processing, and thermal systems.
Stainless Steel 321H Bolts are made up of chromium (17–19%), nickel (9–12%), and titanium for stabilization, featuring a higher carbon content (up to 0.10%) to boost creep strength. These bolts showcase a tensile strength of about 515–620 MPa, a yield strength of 205 MPa, and an elongation of around 35%. They retain excellent mechanical strength and oxidation resistance at high temperatures, particularly in welded environments. Their unique composition provides outstanding resistance to sensitization, thermal fatigue, and intergranular corrosion, making them perfect for high-temperature fastening needs.
Material | Specification | Standards | Size | Length |
Stainless Steel 321H Bolts | ASTM, ASME and API | ASTM B 193 / ASME SB 193 | M02 to M30 | 3 mm To 200 mm |
| Element | SS 321H |
| Tensile Strength (MPa) min | 480 |
| Yield Strength 0.2% Proof (MPa) min | 275 |
| Elongation (% in 50mm) min | 16 |
| Rockwell B (HR B) max Hardness | 95 |
| Brinell (HB) max Hardness | 201 |
| Element | SS 321H |
| Ni | 0.75 |
| C | 0.15 |
| Mn | 1.00 max |
| P | 0.04 max |
| S | 0.03 max |
| Si | 1.00 max |
| Cr | 11.5 – 13.5 |
| Mo | – |
| N | – |
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Stainless Steel 321H bolts are high-performance fasteners designed for high-temperature environments, offering exceptional resistance to oxidation and corrosion. Ideal for aerospace, chemical processing, and industrial applications requiring durability and reliability.
Custom Stainless Steel 321H Hex Bolt is a custom designed fastener with a hexagonal head, designed for high temperature applications. It provides excellent corrosion resistance and strength, ideal for industrial, aerodynamic and aerospace applications.
Stainless Steel 321H leg bolt features a unique leg design for enhanced stability and support. It offers superior high-temperature and corrosion resistance, making it ideal for demanding industrial and aerospace applications.
Stainless Steel 321H expansion anchor bolt is designed for anchoring in concrete or masonry, providing exceptional high-temperature and corrosion resistance. It expands upon installation for secure, reliable holding in harsh environments.
Stainless Steel 321H Hex Flange Head Bolt connects the hexagonal head with an integrated flange, providing superior thermal corrosion resistance. Ideal for safe clamping in industrial and aerospace applications.
Stainless Steel 321H full threaded bolts feature continuous threading and excellent resistance to high temperatures and corrosion. They are ideal for securing components in demanding industrial, aerospace, and chemical processing environments.
We perform several tough tests to guarantee the reliability and performance of our products. Our Stainless Steel 321H Bolts are checked stringently for quality, and we also offer third-party inspection for added assurance. Our logistics are efficient enough to ensure that our delivery is prompt and on time to meet the demands of our clients without delay.
Stainless Steel 321H Bolts find extensive use in industries that require high-temperature and corrosion-resistant fastening solutions. They are especially ideal for refinery equipment, boiler and heat exchanger systems, thermal oxidizers, and superheater components. These bolts are also utilized in aerospace, chemical processing, oil & gas, and power generation sectors where high-temperature exposure is a norm. Their stabilized structure guarantees performance in welded assemblies, preventing weld decay and ensuring mechanical integrity. 321H bolts are a popular choice for pressure vessels, manifolds, and more.
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