The zirconium & zirconium alloy forgings shall be manufactured to ASTM B493 covering 3 grades: Grade R60702: unalloyed zirconium, Grade R60704: zirconium-zin alloy, Grade R60705: zirconium-niobium alloy. All forgings shall be furnished in annealed conditions.

Definition of zirconium & zirconium alloy forgings: parts, including semi-finished products, or complex shapes, produced by hot mechanical work using hammers, presses, or forging machines; a lot shall consist of a material of the same size, shape, condition, and finish produced from the same ingot or powder blend by the same reduction schedule and the same heat treatment parameters. The Zr or Zr alloy forgings shall be furnished with an 8 h period for final continuous anneal.

Chemical Composition of Zirconium & Zirconium Alloy Forging

Element	ASTM B493 Zr & Zr Alloy Forging 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

*Unit of all values: %.

Mechanical Properties of Zirconium & Zirconium Alloy Forging

ASTM B493	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	70	485	55	380	16

*The specimen shall be in annealed condition and tested at room temperature.

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