Hastelloy® B-3 Strip Alloy – High-Performance NiMo Alloy
Spotlight on Hastelloy® B-3 Alloy
Hastelloy® B-3 is one of eight Hastelloy® alloys Elgiloy Specialty Metals produces as a precision-rolled alloy wire, bar, foil, or strip. It belongs to the family of nickel-molybdenum alloys and has an average composition of 65% nickel and 30% molybdenum. Manganese, chromium, cobalt, iron, and tungsten are also all present in small amounts. None of these elements exceed 3% of the total composition.
While the primary function of the Hastelloy® alloys is to survive under high-stress, high-temperature applications, the chief benefit of Hastelloy® B-3 is its ability to resist hydrochloric acid at all temperatures and concentrations. This alloy also resists other vigorously corrosive agents extremely well. These agents include sulfuric acid, phosphoric acid, formic acid, acetic acid, hydrobromic acid and other non-oxidizing agents. Corrosion resistance is effective under both uniform and localized attack of the alloy.
The Hastelloy® B-3 alloy has superior thermal stability to the B-2 alloy because of judicious use of minor elements and a shift in the molybdenum content. It has a low chromium content of around 2%. This makes it unsuitable for applications involving hypochlorite bleach or other strong oxidizing agents. Ferric and cupric salts may cause Hastelloy® B3 to fail prematurely. These oxidizing salts can be formed over time by the passage of hydrochloric acid through iron or copper piping. Although considered a super alloy, Hastelloy® alloys can experience deterioration due to fabricating and handling.
Uniquely, Hastelloy® B-3 maintains high ductility during thermal cycling operations such as heat treatment. This makes it less problematic to fabricate than B-2. Hastelloy® B-3 has a reduced tendency to form Ni4Mo instead of the desirable gamma phase. It withstands embrittlement at higher temperatures and for far longer than its predecessor, B-2. This allows it to be worked into more complex component shapes.
B-2 alloy becomes embrittled very quickly during heat treatment. In comparison, Hastelloy® B-3 usually takes several hours to become brittle. B3 alloy also strongly resists pitting, stress-corrosion cracking, and knife-line and heat-affected zone attack.
Industrially, Hastelloy® B-3 is often used in the production and processing of many concentrated acids. Hastelloy® B-3 is also used to make mechanical components and vacuum furnaces. Hastelloy® B-3 also has many applications in chemical processing. These include making plants for ethylbenzene, phenol, and acetic anhydride production. The pressure vessels used for chloroprene production, along with nuclear reactors, chemical reactors and distillation equipment are manufactured in Hastelloy® B3 alloy.
Hastelloy® B-3 strip alloy can be both forged and otherwise hot-worked. Before it is worked on, the alloy must be heated through at 2250°F (1230°C). This alloy welds well using gas metal arc, gas tungsten arc, and shielded metal arc welding processes. Oxyacetylene and submerged arc welding are best avoided, as they may deprecate corrosion resistance.
Forming components from Hastelloy® B-3 alloy through cold-working techniques is also possible. Hastelloy® B3 hardens rapidly during cold-working, which results in more stages of cold-working and annealing. Cold-working can potentially reduce resistance to stress corrosion cracking.
With a carbon content of less than 0.01%, Hastelloy® B-3 alloy can be used in the as-welded condition. Excessive heating of the alloy should be avoided during finishing to achieve required grain size. Preheating of the material before annealing is seldom necessary.
Hastelloy® B-3 has a tensile strength of 125 ksi (860 MPA) and operates at temperatures between -300°F and 1800°F (-184°C to 900°C). All wrought Hastelloy® B-3 alloys are solution heat-treated at 1950°F (1065°C) before rapid quenching. Annealed strip or coil products are solution heat-treated at 2100°F (1150°C) and cooled in hydrogen.
Extremely versatile, and with the ability to survive under high-stress, high-temperature applications, Hastelloy® B3 has become a global market leader in high-performing nickel-molybdenum alloys.
Hastelloy® is a registered trademark name of Haynes International. Hastelloy® is applied as a prefix for a range of 22 different metal alloys.
Elgiloy Specialty Metals for your Alloy Needs
Elgiloy Specialty Metals produces over 40 high-performance alloys for a diverse range of industries. These include Aerospace, Chemical Processing, Power Generation, Oil & Gas, Dental, and Medical. Most products are delivered to a global customer base as precision rolled strip or wire. They are used in many different applications and are capable of performing in all kinds of extreme environments.
ESM has a Strip Division based in Elgin, IL, and a Wire Division based in Sycamore. Alloy strip is precision rolled from varying grades of nickel, cobalt, titanium, and stainless steels. ESM's metal rolling machinery accommodates gauges between 0.0008” to 0.100”, and widths from 7” to 15”.
Our Strip Division manufactures nickel and titanium alloy products, as well as light gauge strip. Our titanium alloys cover a wide range of grades and are high-performing with a great surface finish. For nickel and nickel-cobalt alloys, ESM is an industry leader. We also offer precision slitting and quality coil-to-coil annealing on all our strip alloys.
Elgiloy’s technicians rigorously inspect and test the alloys to meet Nadcap standards. Our materials testing lab operates 24/7, ensuring a rapid project turnaround. Our alloys comply with AS9100C and ISO 9001:2008.