17-4PH stainless steel (UNS S17400, W.Nr. 1.4542) is a type of martensitic stainless steel that contains chromium, nickel, copper, and niobium. It is known for its exceptional combination of strength, hardness, and corrosion resistance. This material is magnetic and exhibits excellent mechanical properties. It can be readily welded and processed using standard fabrication techniques. Additionally, 17-4PH stainless steel offers high resistance to crack propagation, favorable transverse properties, and proven durability against stress corrosion cracking in marine settings.

15-5PH stainless steel (also known as 15-5PH, UNS S51500, W.Nr. 1.4545) is a type of martensitic precipitation-hardening stainless steel. It possesses excellent strength, corrosion resistance, and mechanical properties at temperatures of up to 600°F (316°C). Furthermore, it exhibits remarkable toughness in both the longitudinal and transverse directions, making it suitable for various applications, including base metal and welds.

UNS N06022 (also known as Alloy C-22, W.Nr. 2.46022, Hastelloy® C-22) is an advanced corrosion-resistant alloy with a fully austenitic structure. This alloy provides excellent resistance to both aqueous corrosion and high-temperature attack, including general corrosion, pitting, crevice corrosion, intergranular attack, and stress corrosion cracking. Hastelloy C-22 typically consists of approximately 22% chromium, 14% molybdenum, and 3% tungsten. The high chromium content of the alloy contributes to its resistance against corrosion by oxidizing media. Additionally, the presence of molybdenum and tungsten provides the alloy with resistance to corrosion by reducing media.

Hastelloy C-276 (UNS N10276, Alloy C-276, W.Nr. 2.4819) is a nickel-molybdenum-chromium alloy that is strengthened by solid solution, with a small proportion of tungsten. It demonstrates exceptional resistance to corrosion in various challenging environments. Its high molybdenum content provides protection against localized corrosion, including pitting. Moreover, the low carbon content prevents the formation of carbides during welding, thereby preserving its resistance to intergranular attack in the heat-affected zones of welded joints. Additionally, Hastelloy C-276 possesses good ductility, making it easily formable and weldable.

UNS N06601 (Alloy 601, W.Nr. 2.4851, Inconel® 601) is a solid solution strengthened alloy primarily composed of nickel and chromium. It is widely recognized for its exceptional resistance to various corrosive media and high temperature environments. This alloy is commonly used in engineering applications that demand both heat and corrosion resistance. Additionally, it exhibits excellent resistance to aqueous corrosion, possesses high mechanical strength, and can be easily formed, machined, and welded.

UNS N08825 ( Alloy 825, W.Nr. 2.4858, Incoloy® 825) is an alloy composed of nickel, iron, and chromium, with additional elements such as molybdenum, copper, and titanium. This alloy exhibits exceptional resistance to various corrosive environments. Its high nickel content enables it to effectively withstand chloride-ion stress-corrosion cracking. The combination of nickel, molybdenum, and copper provides remarkable resistance to reducing environments, including those containing sulfuric and phosphoric acids. Moreover, the presence of molybdenum enhances its ability to resist pitting and crevice corrosion. Furthermore, the inclusion of titanium, along with suitable heat treatment, helps stabilize the alloy against intergranular corrosion sensitization.

The differences in carbon, aluminum, and titanium content among the three alloys, UNS N08810 and UNS N08811, do not vary significantly. However, their mechanical properties and resistance to high-temperature corrosion make them highly valuable for applications requiring prolonged exposure to elevated temperatures and corrosive environments. In comparison to Incoloy 800, both Incoloy 800H and Incoloy 800HT exhibit significantly higher creep and rupture strength. While the carbon content in Incoloy 800 has no lower limit and a maximum of 0.10%, Incoloy 800H has a carbon content ranging from 0.05 to 0.10%, and Incoloy 800HT has a more restricted range of 0.06 to 0.10%. Additionally, Incoloy 800H and Incoloy 800HT undergo a high-temperature annealing treatment, resulting in a coarser grain size. This annealing treatment, along with the controlled chemical composition, contributes to the enhanced creep and rupture strength exhibited by these alloys.

UNS N08800, also known as Alloy 800, W.Nr. 1.4876, or Incoloy® 800, is a nickel-based alloy specifically designed to withstand corrosive and high-temperature environments. Its composition, primarily consisting of nickel, enables it to resist stress corrosion cracking and maintain a ductile, austenitic structure. The presence of chromium in the alloy provides excellent resistance to both aqueous corrosion and high-temperature oxidation. Additionally, the iron content contributes to its ability to resist internal oxidation. Moreover, Incoloy 800 exhibits favorable formability, weldability, and machinability. These exceptional properties make it a widely utilized material for constructing equipment that requires resistance to corrosion, heat, strength, and stability in service conditions of up to 1500°F (816°C).

UNS N0660 (Alloy 600, W.Nr. 2.4816, Inconel® 600) is a nickel-chromium alloy renowned for its nonmagnetic properties. With its substantial nickel content, this alloy exhibits remarkable resistance to corrosion from both organic and inorganic compounds, making it highly resistant to chloride-ion stress-corrosion cracking. The inclusion of chromium imparts resistance to sulfur compounds and offers protection against oxidation in high-temperature or corrosive environments. Moreover, this alloy boasts exceptional mechanical properties, including high strength and excellent workability. However, it should be noted that Inconel 600 cannot be hardened through precipitation, but rather through cold work. Its remarkable versatility has made it a preferred choice in various applications that span a wide temperature range, from cryogenic conditions to temperatures exceeding 2000°F (1095°C).

Inconel 625 (UNS N06625, Alloy 625, W.Nr. 2.4856) is a highly popular nickel-chromium alloy known for its exceptional properties, including high strength, excellent fabricability, and remarkable corrosion resistance. The strength of Inconel 625 is attributed to the reinforcing effect of molybdenum and niobium on its nickel-chromium matrix. As a result, it does not require precipitation hardening treatments. This unique combination of elements also provides superior resistance to various highly corrosive environments and high-temperature effects such as oxidation and carburization. Inconel 625 can effectively perform within a wide temperature range, from cryogenic temperatures up to 1800°F (982°C).