1996GOST 30311-1996 Sponge titanium. Method for determination of Brinell hardness
1979GOST 9853.8-1979 Sponge titanium. Method for the determination of Brinell hardness
0000 GOST 9853.8-1972
GOST 9853.8-1979 Sponge titanium. Method for the determination of Brinell hardness was changed to GOST 30311-1996 Sponge titanium. Method for determination of Brinell hardness.