2011BS 3HR 401:2011 Specification for nickel-chromium-titanium-aluminium heat-resisting alloy seamless tubes (Nickel base, Cr 19.5, Ti 2.2, Al 1.4)
1973BS 2HR 401:1973 Specification for nickel-chromium-titanium-aluminium heat-resisting alloy cold worked and softened seamless tubes (nickel base, Cr 19.5, Ti 2.2, Al 1.4)