ASTM B348 / B348M Grade 21

Chemical Properties

Elements	Composition %
Nitrogen, max	0.03
Carbon, max	0.05
Hydrogen,B,C max	0.015
Iron, max	0.40
Oxygen, max	0.17
Aluminum	2.5 - 4.5
Molybdenum	14.0 - 16.0
Niobium	2.2 - 3.2
Silicon	0.15 - 0.25
Residuals,D,E,F max each	0.1
Residuals,D,E,F max total	0.4
TitaniumG	balance

Note B: Lower hydrogen may be obtained by negotiation with the manufacturer. Note C: Final product analysis. Note D: Need not be reported. Note E: A residual is an element present in a metal or an alloy in small quantities and is inherent to the manufacturing process but not added intentionally. In titanium these elements include aluminum, vanadium, tin, chromium, molybdenum, niobium, zirconium, hafnium, bismuth, ruthenium, palladium, yttrium, copper, silicon, cobalt, tantalum, nickel, boron, manganese, and tungsten. Note F: The purchaser may, in his written purchase order, request analysis for specific residual elements not listed in this specification.

Mechanical Properties

Grade	Tensile Stength, min		Yield Stength (0.2 % Offset) min or range		Elongation in 4D, min, %	Reduction of Area min, %
	ksi	Mpa	ksi	Mpa
21E	115	793	110	759	15	35
21F	140	966	130 to 159	897 to 1096	10	30
21G	170	1172	160 to 185	1104 to 1276	8	30

Note E: Properties for solution treated condition. Note F: Properties for solution treated and aged condition–Moderate strength (determined by aging temperature). Note G: Properties for solution treated and aged condition–High strength (determined by aging temperature).