ASTM B550 Zirconium Alloy Bar And Wire

The zirconium & zirconium alloy bar and wire are manufactured to ASTM B550 covering three grades: Grade R60702: unalloyed zirconium, Grade R60704: zirconium-tin, Grade R60705: zirconium-niobium. The material can be either hot finished or cold finished, often in annealed condition. The Zr & Zr alloy bar or wire may be furnished in round, square, octagon, hexagon or flat shapes. Generally, the delivery conditions include non-descaled, descaled, descaled & pickled, turned, ground or polished.

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Bar: a hot rolled, forged, or cold worked semi-finished solid section product whose cross sectional area is equal to or less than 16 inch2 [10323 mm2]; rectangular bar must be less than or equal to 10 inch [254 mm] in width and greater than 0.1875 inch [4.8 mm] in thickness.
Wire: rounds, flats, or special shapes less than or equal to 0.1875 inch [4.8 mm] in thickness or major dimension.

 

Chemical Composition Requirements

Element	ASTM B550 Zr & Zr Alloy Grades
	R60702	R60704	R60705
Zirconium(+Hf)	≥99.2	≥97.5	≥95.5
Hafnium	≤4.5	≤4.5	≤4.5
Iron+Chromium	≤0.2	0.2~0.4	≤0.2
Tin	-	1.0~2.0	-
Hydrogen	≤0.005	≤0.005	≤0.005
Nitrogen	≤0.025	≤0.025	≤0.025
Carbon	≤0.05	≤0.05	≤0.05
Niobium	-	-	2.0~3.0
Oxygen	≤0.16	≤0.18	≤0.18

 

Mechanical Properties of Zr & Zr Alloy Bar and Wire

ASTM B550	Tensile Strength, min.		Yield Strength, min.		Elongation
Grade	ksi	MPa	ksi	MPa	min. %
R60702	55	380	30	205	16
R60704	60	415	35	240	14
R60705	80	550	55	380	16

 

Our Equipment

Test Methods
Tension Tests-The tension test shall be conducted in accordance with Test Methods E8. Determine the yield strength by the offset (0.2 %) method. Determine the tensile properties using a strain rate of 0.003 to 0.007 in./in. [mm/mm]/min through the yield strength. After the yield strength has been exceeded, the cross-head speed may be increased to approximately 0.05 in./in. [mm/mm]/min to failure.
Chemical Tests-The chemical analyses shall be conducted by the standard techniques.

 

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