Zirconium 705 (R60705)

What is Zirconium 705 and its applications?

Zirconium 705 (UNS R60705) is a niobium-alloyed zirconium grade offering higher strength than commercially pure Zirconium 702. It is considered for chemical-equipment components when both corrosion compatibility and mechanical loading influence the material choice.

Chemical-process equipment: Loaded components in equipment selected for zirconium-compatible fluids.
Pressure equipment: Vessel and connection components requiring a specified material form and design basis.
Heat-transfer systems: Associated hardware where the required load exceeds the chosen 702 condition.

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Engineering Application & Selection Guide

Niobium increases the strength of Zirconium 705, while a protective oxide remains central to its corrosion behavior. Its higher strength does not make 702 test results or design stresses transferable to 705 fasteners.

Zirconium 705 stud bolts — For pressure-joint review, provide the operating load, temperature and material specification instead of specifying only a zirconium grade.
Zirconium 705 hex bolts — On thick-section assemblies, identify the stock size and proposed processing route so condition-specific properties can be checked.
Zirconium 705 custom fasteners — For a welded or heated feature, include the process sequence and required post-process inspection in the drawing review.

Compare Zirconium 702 if the connection can meet its load requirement without the stronger grade. For either material, agree finished-part testing and lot traceability; mill-product data are not a substitute for acceptance of the actual fastener.

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Zirconium 705 Composition

Composition limits · wt.%

ElementWeight %

Zr + Hf: ≥95.5%
Hf: ≤4.5%
Fe + Cr: ≤0.20%
H: ≤0.005%
N: ≤0.025%
C: ≤0.05%
O: ≤0.18%
Nb: 2.0–3.0%

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 705 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 705 Mechanical Properties

Reference sample and condition

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

Key properties	Value
Tensile strength	≥550 MPa
0.2% yield strength	≥380 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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