Hastelloy B-2

UNS N010665 | Alloy B2 | ASTM B619 | MEGA MEX | DIN 2.4615 | GE B50T38

Introduction

Super alloys are also known as high performance alloys. They contain many elements in a variety of combinations designed to provide unique material properties for specific applications. These alloys can function at very high temperatures and in severe mechanical stress environments, and also where high surface stability is required. They have high creep and oxidation resistance.

Strengthening of super alloys is performed by solid-solution hardening, work hardening, and precipitation hardening methods.

HASTELLOY(r) B-2 is a wrought nickel-molybdenum alloy that can be used in the ‘as welded’ condition. This alloy has excellent resistance to all temperatures and concentrations of hydrochloric acid. Additionally, it has good stress corrosion cracking and pitting resistance as well. However, due to the presence of high molybdenum content, this alloy is expensive.

The following datasheet will provide more details about HASTELLOY(r) B-2.

Chemical Composition

The following table shows the chemical composition of HASTELLOY(r) B-2.

Element Content (%)
Nickel, Ni 69
Molybdenum, Mo 28
Iron, Fe 2
Chromium, Cr 1
Cobalt, Co 1
Manganese, Mn 1
Silicon, Si 0.10
Carbon, C 0.01

Physical Properties

The physical properties of HASTELLOY(r) B-2 are outlined in the following table.

Properties Metric Imperial
Density 9.22 g/cm³ 0.333 lb/in³
Melting point 1427°C 2600°F

Mechanical Properties

The mechanical properties of HASTELLOY(r) B-2 are provided below.

Properties Metric Imperial
Tensile strength 914 MPa 133000 psi
Yield strength (@strain 0.200%) 396 MPa 57400 psi
Elastic modulus 217 GPa 31500 ksi
Elongation at break (in 50.8 mm) 55% 55%
Hardness, Brinell (converted from Rockwell B hardness) 168 168
Hardness, Knoop (converted from Rockwell B hardness) 186 186
Hardness, Rockwell B 98 98
Hardness, Vickers (converted from Rockwell B hardness) 241 241

Thermal Properties

The thermal properties of HASTELLOY(r) B-2 are given below.

Properties Metric Imperial
Thermal expansion co-efficient (@21-100°C/69.8-212°F) 10.3 µm/m°C 5.72 µin/in°F
Thermal conductivity 11.1 W/mK 77 BTU in/hr.ft².°F

Machinability

HASTELLOY(r) B-2 can be machined using all the traditional machining methods.

Forming

HASTELLOY(r) B-2 can be easily formed using all the conventional methods.

Welding

HASTELLOY(r) B-2 can be welded using the traditional welding methods.

Heat Treatment

HASTELLOY(r) B-2 can be solution treated at 1065°C (1950°F) and then rapidly quenched in normal conditions that require product forms to be furnished and used. In cases where bright annealed product forms such as sheet and strip are required, HASTELLOY(r) B-2 can be solution treated at 1149°C (2100°F) and then cooled in a hydrogen atmosphere so as to avoid oxidation of the bright surface.

Forging

HASTELLOY(r) B-2 can be easily forged in the temperature range of 1232-982°C (2250-1800°F).

Hot Working

HASTELLOY(r) B-2 can be hot worked.

Cold Working

HASTELLOY(r) B-2 can be cold worked.

Applications

HASTELLOY(r) B-2 is mainly used in chemical process equipment.

Specifications

  • ASTM B333
  • UNS N010665
  • Alloy B2
  • MEGA MEX
  • ASTM B335
  • ASTM B366
  • ASTM B564
  • ASTM B619
  • ASTM B622
  • ASTM B626
  • DIN 2.4615
  • DIN 2.4617
  • GE B50T38

 

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