Zr702 Zirconium Wire

The difference between Zr702 and Zr60702, both are the "industrial pure zirconium", the main difference between them is the content of Fe and Cr.

The chemical composition of Zr702(ASTM B551/B551M)

(Zr+Hf):>= 99.2%

(Hf):<= 4.5%

(Fe+Cr):0.2% max

Other elements: Separately stipulate the maximum content of H,N,C,O.

Zr60702 (GB/T 26314)

(Zr+Hf):>= 99.2%

(Hf):<= 4.5%

(Fe+Cr):0.15% - 0.25%

Here shows an important detail: The domestic standards(GB/T 26314) not only stipulate the maximum content of Fe and Cr, but also the minimum content of them.

Then why the content of Fe+Cr is so important?

Fe and Cr are the common impurity for the zirconium products, while the existence of them obviously impact the mechanical property(strength) and decay-resistance ability. Especially in some designated medium such as the concentrated nitric acid with high temperature. Zr60702 aims to pursuing the more stable and more accordance-able property by keeping the concentration of the Fe and Cr within a narrow range.

Both of zr60702 and zr702 possess the outstanding performance of industrial pure zirconium:

Magnificent decay-resistance: Far better than stainless steel and nickel-based alloy at the application environment of hydrochloric acid, vitriol,nitric acid and multiple kinds of organic acid and sulphites due to its excellent decay resistance.

Moderate mechanical property.

Nice processable property: Both hot-working and cold-working are supportive.

Except from the nuclear application: Both zr60702 and zr702 has highly content of Hf which is the strong absorption element in nuclear reactor and that's why they cannot be applied to nuclear reactor. Nuclear-level zirconium alloy(like zr704) must have the lowest content Hf(<0.01%).

Container with decay resistance and liner.

Zr60702 is a grade established by China's National Standards to align with international recognized zr702 standards. Zr60702 inherits all the advantages of zr702 and completes the elaborate regulate and control for getting command of key impurities(Fe+Cr).

The coordinate property: Theoretically speaking, zr60702 possesses the more stable and consistent mechanical property and corrosion resistance for the strictly composition control. While zr702 is sufficient for most of the industrial application in the practical application occasions.

Follow design specification to choose zr60702 or zr702 align with the ASTM and GB standard. Zr60702 for GB requirement and Zr702 for ASTM standard.

zr60702 probably easily to purchase and with cost advantage in Chinese market.

Strictly content control of zr60702 is an advantage for the stability highly-demanding materials for extremely harsh corrosion environment equipment(Vibration conditions etc.)

In a word, zr60702 and zr702 are the pure industrial zirconium with the same level and parallel property, can be substitutes for each other. The main distinction is the different standard system and the detail control of the content. The design requirements should be followed when making a choice.