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Hafnium Rod / Bar

hafnium rod

Application of Hafnium Rod / Bar

Hafnium is used as a control material in nuclear reactors. At present, almost all Marine water-cooled reactors use pure Hafnium atomic grade as control rods.
In addition, small and medium-sized power grids in remote areas, seawater desalination, industrial heating, residential heating and other small reactors also commonly use atomic Hafnium as control rods.

hafnium bar

Some high - flux research test reactors also use atomic - grade Hafnium as control rods.

Properties of Hafnium Rod / Bar

Mechanical properties of hot rolled and cold processed Hafnium Rod / Bar
Grade Status Temperature/℃ Tensile strength/MPa Yield strength/MPa Elongation/% Standard
R1 annealed room temperature 448 172 22 ASTM B737
316 275 110 32 ASTM B737
R2 annealed room temperature 517 241 20 ASTM B737
316 310 138 30 ASTM B737
Grades and chemical compositions of Hafnium Rod / Bar in hot rolling and cold processing
Grade Chemical composition (mass fraction)/%≤
Hf Zr Al C Cr Cu H Fe Mo Ni Nb
R1 Balance - 0.010 0.015 0.010 0.010 0.0025 0.050 0.0020 0.0050 0.010
R3 Balance - 0.050 0.025 0.050 - 0.0050 0.0750 - - -
Grade Chemical composition (mass fraction)/%≤ Standard
O Si Ti Ta Sn W U V N
R1 0.040 0.010 0.010 0.020 0.0050 0.0150 0.0010 0.0050 0.010 ASTM B737
R3 0.130 0.050 0.050 - - 0.0150 - - 0.0150 ASTM B737
Mechanical properties of Hafnium Rods for nuclear use
Grade Status Test temperature℃ Tensile strength Rm/MPa Specify plastic elongation
strength Rp0.2/MPa
Elongation after
break A50/%
R1 recrystallization annealing room temperature ≥400 ≥150 ≥22