Hastelloy C276 vs SS316
Hastelloy C276 vs SS316
Hastelloy C276 offers excellent corrosion and heat resistance (especially in highly corrosive chemicals/high-temperature environments) and strength, making it ideal for demanding conditions. 316 stainless steel (SS316), on the other hand, is more economical and offers good corrosion resistance (chlorides) sufficient for standard applications, but performs poorly in extreme high temperatures or corrosive media. C276, however, excels in resistance to pitting and cracking. C276 contains nickel, molybdenum, tungsten, and chromium; SS316 is an iron-based alloy containing chromium, nickel, and molybdenum.
What are the uses of Hastelloy C276?
Hastelloy C-276 is widely used in a variety of harsh environments, such as chemical processing, pollution control, pulp and paper production, industrial and municipal waste treatment, and acidic natural gas recovery.
Hastelloy C276 Alloy
C276 alloy is a nickel-molybdenum-chromium alloy renowned for its exceptional corrosion resistance, especially in acidic environments. Known for its strength and ductility, it is widely used in numerous fields, including chemical processes, nuclear fuel reprocessing systems, oil and gas processing equipment, pharmaceutical components, and electrical enclosures. Its prevalence in applications susceptible to extreme temperatures or corrosive solutions underscores its reliability and durability.
316 Stainless Steel
316 stainless steel is another versatile material with several advantages over other stainless steels. It exhibits excellent resistance to oxidation and sulfide corrosion and maintains superior mechanical properties over a wide temperature range. Its high-temperature resistance makes it an indispensable material for heat exchangers, boilers, condensers, and piping systems. Furthermore, its good resistance to chlorides gives it an advantage in marine environments, where rapid corrosion has been a long-standing challenge for other metallic materials.
Chemical Composition of Hastelloy C-276 vs Stainless Steel 316
| Element | Hastelloy C-276 (UNS N10276) Content (%) | Stainless Steel 316 (UNS S31600) Content (%) |
|---|---|---|
| Nickel | 57.0 min (Balance) | 10.0 – 14.0 |
| Chromium | 14.5 – 16.5 | 16.0 – 18.0 |
| Molybdenum | 15.0 – 17.0 | 2.0 – 3.0 |
| Iron | 4.0 – 7.0 | Balance |
| Tungsten | 3.0 – 4.5 | – |
| Cobalt | ≤ 2.5 | – |
| Manganese | ≤ 1.0 | ≤ 2.0 |
| Silicon | ≤ 0.08 | ≤ 1.0 |
| Carbon | ≤ 0.01 | ≤ 0.08 |
| Phosphorus | ≤ 0.04 | ≤ 0.045 |
| Sulfur | ≤ 0.03 | ≤ 0.030 |
| Vanadium | ≤ 0.35 | – |
| Copper | – | ≤ 0.75 (optional) |
| Nitrogen | – | ≤ 0.10 (optional) |
Mechanical Properties of Hastelloy C-276 vs Stainless Steel 316
| Property | Hastelloy C-276 (Annealed) | Stainless Steel 316 (Annealed) |
|---|---|---|
| Tensile Strength, Ultimate | 690 MPa (100 ksi) | 515 MPa (75 ksi) |
| Tensile Strength, Yield (0.2% Offset) | 283 MPa (41 ksi) | 205 MPa (30 ksi) |
| Elongation at Break | 40% | 40% |
| Reduction of Area | 50% | 50% |
| Hardness, Rockwell B | 87 HRB | 79 HRB |
| Hardness, Brinell | 190 HB | 160 HB |
| Modulus of Elasticity | 205 GPa (29.7 x 10⁶ psi) | 193 GPa (28.0 x 10⁶ psi) |
Differences between Hastelloy C276 and SS316
Durability and Corrosion Resistance
Compared to SS316, Hastelloy C276 offers superior durability and corrosion resistance. This makes it ideal for applications requiring extremely high corrosion resistance, such as chemical processing, pulp and paper manufacturing, and marine environments. It resists pitting and stress corrosion cracking even in high-temperature or acidic environments. On the other hand, SS316 has good corrosion resistance, but not as good as Hastelloy C276. It resists chlorides, weak acids, and solvents, but is susceptible to pitting and crevice corrosion in warm chloride environments.
Strength and Formability
Due to its higher chromium content (18% vs. 16%), SS316 has slightly higher strength than Hastelloy C276. However, both materials offer excellent strength-to-weight ratios, making them suitable for many engineering applications. In terms of formability, both materials can be easily formed into complex shapes without any loss of performance. They can also be processed using traditional techniques, achieving excellent surface finishes with minimal processing.
Cost and Supply
SS316's advantage lies in its lower production cost, making it significantly cheaper than Hastelloy C276. Furthermore, due to its widespread use among manufacturers globally, the supply of SS316 is more abundant than that of Hastelloy C276. This allows engineers and metalworking professionals to more easily procure this material at competitive prices.
Application Areas - Differences between Hastelloy C276 and 316L
Hastelloy C276 is suitable for highly corrosive and extreme environments, while 316L has a wide range of applications suitable for less corrosive environments.
Hastelloy C276:
Chemical Processing: Due to its strong corrosion resistance, it is commonly used in reactors, heat exchangers, and towers.
Pollution Control: Ideal for flue gas desulfurization systems.
Pulp and Paper: Suitable for bleaching plants and other corrosive environments.
Marine and Aerospace: Used for components exposed to seawater and high-temperature gas environments.
Specialty Equipment: Suitable for acid gas applications and the oil and gas industry.
316 Stainless Steel:
Food Processing: Used for equipment and surfaces with extremely high hygiene requirements.
Pharmaceuticals: Ideal for equipment and containers due to its corrosion resistance and cleanliness.
Marine Applications: Suitable for ship fittings, coastal construction, and other marine environments.
Medical Devices: Commonly used for surgical instruments and implants due to its good biocompatibility.
Architecture: Due to its aesthetic appeal and corrosion resistance, it is widely used in high-end buildings and structures.
Gnee Steel is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ru@gneesteelgroup.com for a quote.