Strip – HASTELLOY® B-3® alloy

Strip – HASTELLOY® B-3® alloy

HASTELLOY® B-3® alloy

UNS N10675
W.Nr 2.4600


Chemical processing, vacuum furnaces, mechanical components.


HASTELLOY® B-3® alloy is a nickel-molybdenum alloy with thermal stability greater than that of HASTELLOY® B-2 alloy. It has excellent resistance to pitting, corrosion, and stress corrosion cracking. It has excellent resistance to hydrochloric acid at all concentrations and temperatures. It also withstands sulfuric, acetic, formic, and phosphoric acids, and other non-oxidizing media.

Nominal Composition

C: 0.01 max
Mn: 3.00 max
Si: 0.10 max
P: 0.030 max
S: 0.010 max
Cr: 1.00 – 3.00
Co: 3.00 max
Mo: 27.00 – 32.00
V: 0.20 max
Fe: 1.00 – 3.00
Al: 0.50 max
W: 3.00 max
Ni: 65.00 min

Physical Properties

Density: 0.333 lb/in3, (9.22 g/cm3)

Modulus of Elasticity (E):
At 70°F (20°C): 31.4 x 103 ksi (216 GPa)

Modulus of Rigidity (G):
At 70°F (20°C): 12.0 x 103 ksi (83 GPa)

Coefficient of Expansion:
6.6 µin/in.-°F (70°F to 1000°F)
11.8 µm/m-°C (20°C to 538°C)

Electrical Resistivity: 53.8 µΩ.in, (137 µΩ.cm)

Thermal Conductivity: 78.0 Btu-in/ft2hr-°F, (11.2 W/m-K)

Applicable Specifications

Strip: ASTM B333

Typical Mechanical Properties

    • Annealed
      • Heat Treatment: 2100°F (1150°C)
      • Tensile Strength: 110 ksi (760 MPa) min 125 ksi (860 MPa) typ
      • Suggested Operating Conditions: -300°F to 1800°F (-184°C to 900°C)

HASTELLOY® is a registered trademark of Haynes International, Inc.

For further information Contact:

Contact Us
Phone: 1 888 843 2350
Elgiloy Specialty Metals – Strip Products
1565 Fleetwood Dr.
Elgin, IL 60123 USA

Limitation of Liability and Disclaimer of Warranty:

  • The content in these data sheets is provided primarily by third-party melting mills and is provided for reference only.  It is not intended for engineering or design.
  • Applications may be discussed, however, Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, does not recommend or endorse any material for any particular end use or application.
  • The data included in this data sheet are typical values and may vary.
  • Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, makes no representations or warranties, express or implied, as to the accuracy, completeness, condition, suitability, performance, fitness for a particular purpose, or merchantability of any information contained in any data sheet.

In no event will Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, be liable for any damages whatsoever arising from the use of the information included in the data sheets.

HASTELLOY® B-3® alloy – High-Performance NiMo Alloy

Spotlight on HASTELLOY® B-3® alloy

HASTELLOY® B-3® alloy 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® alloy 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 HASTELLOY®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® B-3® alloy 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® alloy maintains high ductility during thermal cycling operations such as heat treatment. This makes it less problematic to fabricate than HASTELLOY® B-2 alloy. HASTELLOY® B-3® alloy 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, HASTELLOY® B-2 alloy. This allows it to be worked into more complex component shapes.

HASTELLOY®B-2 alloy becomes embrittled very quickly during heat treatment. In comparison, HASTELLOY® B-3® alloy usually takes several hours to become brittle.  HASTELLOY® B-3® alloy also strongly resists pitting, stress-corrosion cracking, and knife-line and heat-affected zone attack.

Industrially, HASTELLOY® B-3® alloy is often used in the production and processing of many concentrated acids. HASTELLOY® B-3® alloy is also used to make mechanical components and vacuum furnaces. HASTELLOY® B-3® alloy 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® B-3® alloy.

HASTELLOY® B-3® 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® B-3® alloy 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® alloy 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® B-3® alloy has become a global market leader in high-performing nickel-molybdenum alloys.

HASTELLOY® is a registered trademark name of Haynes International, Inc.

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.