Hastelloy® B-2

HASTELLOY B-2 is a nickel based alloy particularly suited for handling reducing acids at high concentrations and temperatures. The alloy resists formation of grain boundary carbides in the weld HAZ, making it suitable for most chemical process conditions in the as-welded condition.

Because this alloy contains no significant chromium addition it should NOT be used in oxidizing media or in presence of oxidizing salts, such as ferric or cupric salts. The latter may form when iron or copper is present in a system containing hydrochloric acid. Likewise HASTELLOY B-2 does not withstand wet chlorine gas or hypochlorite bleach.

HASTELLOY B-2 should not be exposed to temperatures in the 1000 - 1600°F range because of severe loss of ductility. In a vacuum HASTELLOY B-2 may be used from 1600°F to substantially higher temperatures.

Chemistry

 NiCrMoMnSiCSPCoFe
MIN -- -- 26.0 -- -- -- -- -- -- --
MAX balance 1.0 30.0 1.0 0.1 0.02 0.03 0.04 1.0 2.0

Specifications

ASME SB 333ASME SB 335ASME SB 366
ASME SB 619ASME SB 619 Class I or II
ASME SB 622ASME SB 626
ASTM B 333ASTM B 335
ASTM B 366ASTM B 619
ASTM B 619 Class I or IIIASTM B 622NACE MR0175UNS N10665
W. Nr./EN 2.4617

Inventory

Hastelloy® B-2 Weld Wire

Features

  • Resists hydrochloric acid at all concentrations and temperatures
  • Withstands wet HCl gas, sulfuric, acetic and phosphoric acids
  • Excellent resistance to pitting and to stress corrosion cracking

Applications

  • Acetic acid production, initial phase in presence of iodide catalyst
  • Methyl methacrylate production with hot 98% H2SO4
  • Production of herbicides, insecticides, ethylene glycol and ethyl benzene
  • Butane isomerization to produce high octane gasoline
  • Resists corrosion from antimony chloride

Physical Properties

Density: 0.333 lb/in3
Electrical Resistivity: 824 Ohm - circ mil/ft

Temperature, °F 32 212 392 572 752 932
Coefficient* of Thermal Expansion, in/in°F x 10-6 -- 6.0 6.0 6.2 6.4 6.5
Thermal Conductivity Btu • ft/ft2 • hr • °F 6.4 7.1 7.7 8.4 9.2 10.0

* 70°F to indicated temperature.

Mechanical Properties

Minimum Specified Properties, ASTM A 240

 TypicalMinimum Specified
Ultimate Tensile Strength, (ksi 130 110
0.2% Yield Strength, ksi 59 51
Elongation, % 60 40
Hardness MAX, Brinell 94-98 100 max