Zirconium 702 (Reference)
Zirconium is a highly corrosion-resistant reactive metal. Because 'zirconium' is not a single grade, this page uses Zirconium 702 (UNS R60702) as the common engineering reference for plate, sheet and strip.
Zirconium 702 (Reference) Information
Zirconium is a highly corrosion-resistant reactive metal. Because 'zirconium' is not a single grade, this page uses Zirconium 702 (UNS R60702) as the common engineering reference for plate, sheet and strip.
Metallic winding and compatible ring components where service conditions are suitable.
| Reference Grade | UNS R60702 / Zirconium 702 |
|---|---|
| Common Product Specification | ASTM B551 |
| Material Type | Commercially pure zirconium |
| Common / Applicable Specification | ASTM B551 (reference grade R60702) |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
Zirconium 702 (Reference) Chemical Composition
Reference composition limits are shown below. Exact requirements should be confirmed against the applicable product specification and certified material documentation.
| Element / Constituent | Symbol | Composition / Information |
|---|---|---|
| Zirconium + Hafnium | Zr+Hf | 99.2 min. |
| Hafnium | Hf | 4.5 max. |
| Iron + Chromium | Fe+Cr | 0.20 max. |
| Carbon | C | 0.05 max. |
| Nitrogen | N | 0.025 max. |
| Hydrogen | H | 0.005 max. |
| Oxygen | O | 0.16 max. |
Zirconium 702 (Reference) Mechanical Properties
Reference room-temperature properties are shown for a commonly supplied condition. Exact requirements depend on product form, size, heat treatment and governing specification.
| Property | Reference Value | Unit / Basis |
|---|---|---|
| Tensile Strength | 379 min. | MPa |
| 0.2% Offset Yield Strength | 207 min. | MPa |
| Elongation | 16 min. | % |
Values shown are engineering reference data, not universal design allowables. Final procurement and design must use the governing specification, exact product form/condition and certified material test documentation.
Zirconium 702 (Reference) Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 6.51 g/cm³ |
|---|---|
| Structure | Hexagonal close-packed at room temperature |
| Corrosion Behaviour | Excellent resistance to many strong acids, alkalis and chloride solutions. |
| Service Limitation | Can be attacked by hydrofluoric acid and certain oxidizing chloride environments; application-specific review is essential. |
| Service Selection | Confirm grade, oxygen content and product specification for final design. |
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