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Hastelloy B-2 (UNS N10665) nickel-molybdenum alloy
Hastelloy B-2 Features and Applications Overview:
Nickel-molybdenum alloy Hastelloy B-2 has very low carbon and low silicon content and lowers the precipitation of carbon and other impurity phases in the weld heat-affected zone, so that the weld is also sufficiently corrosion resistant. Hastelloy B-2 has good corrosion resistance in reducing media, such as hydrochloric acid solutions at various temperatures and concentrations. In the medium concentration of sulfuric acid solution (or contain a certain amount of chloride ion) also has good corrosion resistance. At the same time can also be used for acetic acid and phosphate environment. Alloy materials have the best corrosion resistance only in the proper metallurgical state and pure crystalline structure. In the chemical, petrochemical, energy manufacturing and pollution control has a wide range of applications, especially in sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid and other industries.
Hastelloy B-2 Similar Grades:
NS322 (China), NiMo28 (France), W.Nr.2.4617 (Germany)
Hastelloy B-2 Chemical composition:
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Alloy
Grade
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%
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Ni
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Cr
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Fe
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Mo
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Nb
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Co
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C
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Mn
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Si
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S
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Cu
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Al
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Ti
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Hastelloy B-2
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Min
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Margin
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0.4
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1.6
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26.0
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Maximum
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1.0
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2.0
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30.0
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1.0
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0.01
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1.0
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0.01
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0.5
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Hastelloy B-2 Physical Properties:
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Density
g/cm3
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Melting point
℃
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Thermal conductivity
λ/(W/m•℃)
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Specific heat capacity
J/kg•℃
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Elastic Modulus
GPa
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Shear modulus
GPa
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Resistivity
μΩ•m
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Poisson's ratio
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Linear expansion coefficient
a/10-6℃-1
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9.2
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1330
1380
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11.1(100℃)
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377
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217
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1.37
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10.3(20~100℃)
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Hastelloy B-2 mechanical properties: (at 20 ℃ to detect the minimum mechanical properties)
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Heat treatment methods
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Tensile strength σb / MPa
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Yield strength σp0.2 / MPa
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Elongation rate σ5 /%
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Brinell hardness HBS
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Solution treatment
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745
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325
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40
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≥250
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astelloy B-2 Production Executive Standard:
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Standard
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Bar
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Forgings
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Plate (with) material
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Wire
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Pipe
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American Society for Testing and Materials
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ASTM B335
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ASTM B335
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ASTM B333
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ASTM B622
ASTM B619
ASTM B626
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American Aerospace Materials Technical Specification
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American Society of Mechanical Engineers
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ASME SB335
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ASME SB335
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ASME SB333
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ASTM SB622
ASTM SB619
ASTM SB626
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Hastelloy B-2 microstructure:
Hastelloy B-2 is a face-centered cubic lattice structure. By controlling the iron and chromium content to a minimum, process brittleness is reduced, preventing precipitation of the Ni4Mo phase at 700-870 ° C.
Hastelloy B-2 process performance and requirements:
1, should be quickly heated to the required temperature. Hot working temperature range of 1160 ℃ ~ 900 ℃.
2, the average grain size of the alloy and forging deformation degree, the final forging temperature is closely related.
3, the alloy surface oxide, oxide color and weld around the welding slag adhesion stronger than stainless steel, it is recommended to use fine crystal belt or fine grinding wheel for grinding.
4, the alloy should be machined after annealing, due to the higher work-hardening rate of the material, it is appropriate to use lower than the standard machining of low-alloy austenitic stainless steel cutting speed and heavy knife for processing, in order to cut into the hardened surface the following.
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