Copper-Nickel-TinBeryllium-freeIn production
Hardiall Eco
CuNi9Sn6 · C72700
Hardiall Eco is a variant of Hardiall with less nickel and tin, supplied as bars. It serves pivot bushings, bearings and thrust washers in mining and construction vehicles, and powertrain parts in racing cars.
689–724 MPaYield strength
790–827 MPaTensile strength
5–6 %Elongation
12 %IACSEl. conductivity
Specify this grade
Qualification packs are released after a short form. Export control applies.
Properties
Guaranteed values, by temper.
- Alloy family
- Copper-Nickel-Tin
- Chemistry family
- CuNiSn
- Lead-free
- Yes
Forms
Forms & dimensions available
Bars6 variant(s)
Dimensional ranges and tolerances on request — machining and finishing are in house.
Standards
Standards & equivalences
- ASTM B929
- CW355H
- NACE MR0175
Product and process qualifications are listed above. Customer approvals are confidential and are not disclosed.
Applications
Markets & applications
Applications
- Pivot bushings and bearings for excavators, haul trucks and draglines
- Thrust washers for continuous miners and other heavy mining vehicles
- Valve guides, bearings and piston pins in racing car powertrains
- Brake caliper bushings and steering bushings
Why this grade
Less nickel and tin than Hardiall, while keeping a good balance for high-strength parts
Resists wear and galling, with excellent lubricity in bushings and thrust washers
Direct replacement for beryllium copper and leaded beryllium copper
Non-magnetic and non-sparking, with no hydrogen embrittlement
Alternatives
If this grade is not the right trade-off.
GradeChemistryYield strengthChoose it when
Hardiall EcoYou are hereCuNiSn724 MPaChoose it when a bushing or bearing machined from bar needs the wear behaviour of the Hardiall range and no aerospace specification applies to the part.
DeclaforCuNiSnTe850 MPaChoose it when a precision part is machined from rod and its finish matters, since Declafor is the grade of the family with a tellurium addition for machining and polishing.
HardiallCuNiSn1,250 MPaChoose it when a bearing or bushing machined from bar or hollow bar must be compliant with AMS 4596, AMS 4597 or AMS 4598. It also offers the widest choice of tempers in the family.
Niclafor 1000CuNiSn1,100 MPaChoose it when a contact, spring or shield is stamped or formed from strip or wire and needs more strength than Niclal 725 offers, compliant with ASTM B740.
Niclal 725CuNiSn600 MPaChoose it when a connector or sensor part is bent or deep drawn from strip, and a balance of elasticity and conductivity matters more than the strength of Niclafor 1000.