Zirconium 702 (R60702)

What is Zirconium 702 and its applications?

Zirconium 702 (UNS R60702) is commercially pure zirconium used in corrosion-resistant chemical equipment. Its value lies in compatibility with particular process media, not in a general claim that it resists every acid.

Chemical vessels: Wetted equipment components selected against process-specific corrosion data.
Heat exchangers: Corrosion-resistant heat-transfer equipment and associated connections.
Process piping: Components for chemical circuits with defined concentration, temperature and impurity limits.

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Engineering Application & Selection Guide

Zirconium forms a protective oxide film that underpins its corrosion resistance. For fasteners, distinguish this surface-dependent corrosion behavior from the mechanical acceptance requirements of the finished threaded part.

Zirconium 702 stud bolts — For wetted flange connections, state the full fluid composition, including contaminants and cleaning chemicals.
Zirconium 702 hex bolts — Show the bearing faces and any contact with dissimilar metals on the drawing so the complete joint can be assessed.
Zirconium 702 hex nuts — Define the mating thread, engagement length and assembly method together; a matching alloy label alone does not establish joint capacity.

Zirconium 705 adds niobium for greater strength. Select between them using the proposed material form and condition, then confirm process compatibility separately. Identify any welding or hot work in the manufacturing route so cleanliness and heat-treatment requirements can be reviewed.

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Zirconium 702 Composition

Composition limits · wt.%

ElementWeight %

Zr + Hf: ≥99.2%
Hf: ≤4.5%
Fe + Cr: ≤0.20%
H: ≤0.005%
N: ≤0.025%
C: ≤0.05%
O: ≤0.16%

ASTM / ASME specifications by product form

Finished-product requirements

Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.

Zirconium 702 hex bolt requirements ↗

Fasteners · dimensional references

Product	Reference
Hex bolts	ISO 4014 / ISO 4017 · ASME B18.2.1
Threaded studs	DIN 976-1 · ASME B18.31.2
Hex nuts	ISO 4032 · ASME B18.2.2
Socket head screws	ISO 4762 · ASME B18.3
Flat washers	ISO 7089 / ISO 7090 · ASME B18.21.1
Custom fasteners	Customer drawing

Raw-material specifications

Product form / scope	Reference
Bar & wire · Specify grade, condition and order requirements.	ASTM B550
Plate, sheet & strip	ASME SB551
Seamless & welded tube	ASME SB523
Forgings	ASME SB493
Bar	ASME SB550
Seamless & welded pipe	ASME SB658

Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.

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Zirconium 702 Mechanical Properties

Reference sample and condition

Data basis: Catalogue reference minimums
Gauge length: A5, as labelled in supplied table

Key properties	Value
Tensile strength	≥380 MPa
0.2% yield strength	≥205 MPa
Elongation	≥16%

Supplied technical reference · Scanned PDF page 10 · printed page 22

Procurement and application guide

Specify the material and final condition

Verify the medium, impurities and temperature; zirconium is not suitable for every acid.

Material forms in the technical reference: Bar · Wire · Sheet · Strip · Plate · Tube · Pipe · Forgings.

Define the finished-part acceptance

Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.

Start with the information you have

Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.

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