ASTM B551 /B551M

This specification covers five grades of zirconium strip, sheet, and plate.The following precautionary caveat pertains only to the test method portions of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Chemical Properties

Alloy	Zirconium + hafnium, min	Hafnium, max	Iron + chromium	Tin	Hydrogen, max	Nitrogen, max	Carbon, max	Niobium	Oxygen, max
UNS R60700	99.2	4.5	0.2 max	-	0.005	0.025	0.05	-	0.10
UNS R60702	99.2	4.5	0.2 max	-	0.005	0.025	0.05	-	0.16
UNS R60704	97.5	4.5	0.2-0.4	1.0-2.0	0.005	0.025	0.05	-	0.18
UNS R60705	95.5	4.5	0.2 max	-	0.005	0.025	0.05	2.0-3.0	0.18
UNS R60706	95.5	4.5	0.2 max	-	0.005	0.025	0.05	2.0-3.0	0.16

Mechanical Properties

Alloy	Tensile strength		Yield strength		Elongation in 2 in. or 50 mm, min, %A	Bend test radiusB
	min, ksi [MPa]	max, ksi [MPa]	min, ksi [MPa]	max, ksi [MPa]
UNS R60700	-	55 [380]	-	44 [305]	20	5T
UNS R60702	55 [380]	-	30 [205]	-	16	5T
UNS R60704	60 [415]	-	35 [240]	-	14	5T
UNS R60705	80 [550]	-	55 [380]	-	16	3T
UNS R60706	74 [510]	-	50 [345]	-	14	2.5T

Note A: When a sub-size specimen is used, the gage length shall be as specified in Test Methods E 8 for that specimen. Note B: T equals the thickness of the bend test specimen. Bend tests are not applicable to material over 0.187 in. [4.8 mm] in thickness.

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