Copper Alloy C96900-TX00
Supply condition · default condition
UNS C96900 · EN CC383H, CuNi30Fe1Mn1NbSi-C
TX00 = spinodal heat treated
Standard commercial hardened condition — best balance of ~650 MPa yield, wear/galling resistance and residual ductility for bearings, bushings and valve parts.
Values for the TX00 condition
Other C96900 tempers and conditions
C96900 is listed in 5 conditions; see the grade overview at C96900.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As sand cast | Soft as-cast sand castings, ordered when the part will be spinodally aged after rough machining or when maximum ductility is wanted. | 240 | 480 | 12 | 160 HB | 7 % IACS |
As centrifugally cast | Centrifugally cast sleeves/rings in the unhardened condition, normally a semi-finished stage before TX00 aging. | 260 | 520 | 15 | 170 HB | 7 % IACS |
As continuous cast | Continuous-cast bar/tube stock in the soft condition — the usual purchase form for shops that heat treat in-house. | 275 | 550 | 18 | 180 HB | 7.5 % IACS |
TX00DefaultThis page Spinodal heat treated | Standard commercial hardened condition — best balance of ~650 MPa yield, wear/galling resistance and residual ductility for bearings, bushings and valve parts. | 655 | 795 | 8 | 28 HRC | 11 % IACS |
TX00 high-strength age | Peak-aged producer temper for the highest yield and galling resistance in downhole and heavily loaded subsea bearings; accept lower elongation and impact. | 745 | 860 | 5 | 32 HRC | 12 % IACS |
What is C96900-TX00?
C96900-TX00 is C96900 supplied in the TX00 condition — standard commercial hardened condition — best balance of ~650 MPa yield, wear/galling resistance and residual ductility for bearings, bushings and valve parts. C96900-TX00 has a yield strength of 655 MPa (95 ksi) and a tensile strength of 795 MPa (115 ksi) — stronger than 96% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 138 GPa (20 Msi). C96900-TX00 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,010°C (1,850 °F).
Advantages
- High strength — 655 MPa (95 ksi), better than 96% of copper alloy grades
- Stiff — 138 GPa (20 Msi), better than 95% of copper alloy grades
- Good corrosion resistance — 78/100, better than 94% of copper alloy grades
- High service temperature — 260°C (500 °F), better than 75% of copper alloy grades
Limitations
- High embodied carbon — 6.5 kg CO₂/kg, worse than 94% of copper alloy grades
- Limited ductility — 8%, worse than 83% of copper alloy grades
- Poor heat conductor — 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 82% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
C96900-TX00 properties
Typical room-temperature values for C96900-TX00; 18 are specific to this condition. Other listed values are C96900 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C96900-TX00 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,010°C (1,850 °F).
Mechanical15
C96900-TX00 has a yield strength of 655 MPa (95 ksi) and a tensile strength of 795 MPa (115 ksi) — stronger than 96% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 138 GPa (20 Msi).
Thermal5
C96900-TX00 is rated for continuous service to 260°C (500 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 82% of copper alloy grades. Thermal expansion is 16.4 µm/m·K (9.11 µin/in·°F).
Electrical3
C96900-TX00 conducts electricity at 11 % IACS, worse than 68% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of copper alloy grades.
Sustainability4
Producing a kilogram of C96900-TX00 takes about 95 MJ of energy and emits 6.5 kg of CO₂ — more than 95% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C96900-TX00's machinability is good (58/100, better than 73% of copper alloy grades); weldability poor (25/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C96900-TX00
Is C96900 easy to machine?
Machines well in the aged TX00 temper with sharp carbide tooling, positive rake and modest speeds (60–120 m/min); chips break cleanly, no lead needed, and the soft as-cast temper is gummier than the hardened one.
Can C96900 be welded?
Not recommended for structural joints — fusion welding over-ages the spinodal structure and risks tin segregation cracking; use mechanical joints, or requalify with a full post-weld solution + aging cycle.
Can C96900 be formed, bent or molded?
Supplied as continuous, centrifugal or sand castings; control pour temperature and cooling to avoid tin inverse segregation, and rough-machine before the spinodal age for best dimensional stability.
What surface finishes work on C96900?
Takes a fine bearing-grade polish (Ra < 0.4 µm); tin, silver or chemical Ni plating is possible for anti-galling or electrical contact duty — anodizing does not apply.
C96900 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| NiNi + Co may be reported together | 14.5 – 15.5 | 15 |
| Snspinodal hardening element | 7.5 – 8.5 | 8 |
| Fe | ≤ 0.5 | 0.15 |
| Zn | ≤ 0.5 | 0.1 |
| Mndeoxidiser | ≤ 0.3 | 0.1 |
| Nbgrain refiner, optional | ≤ 0.1 | — |
| Pbkeep low for hot-tear resistance | ≤ 0.02 | — |
| Curemainder, nominally ~76.5 % | balance | — |
C96900-TX00 — frequently asked
What is C96900-TX00 used for?
C96900-TX00 is typically used for large ship propellers, high-load marine pump castings and offshore structural fittings. In short: strongest cast Cu-Ni; nb-microalloyed propeller grade; higher strength than C96400.
What is the yield strength of C96900-TX00?
C96900-TX00 has a typical yield strength of 655 MPa (95 ksi) and a tensile strength of 795 MPa (115 ksi) — stronger than 96% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C96900-TX00 easy to machine?
Reasonably — machinability is rated good (58/100, better than 73% of copper alloy grades). Machines well in the aged TX00 temper with sharp carbide tooling, positive rake and modest speeds (60–120 m/min); chips break cleanly, no lead needed, and the soft as-cast temper is gummier than the hardened one.
Can C96900-TX00 be welded?
Not readily — weldability is rated poor (25/100). Not recommended for structural joints — fusion welding over-ages the spinodal structure and risks tin segregation cracking; use mechanical joints, or requalify with a full post-weld solution + aging cycle.
What surface finishes work on C96900-TX00?
Takes a fine bearing-grade polish (Ra < 0.4 µm); tin, silver or chemical Ni plating is possible for anti-galling or electrical contact duty — anodizing does not apply.
Can C96900-TX00 be formed, bent or molded?
Supplied as continuous, centrifugal or sand castings; control pour temperature and cooling to avoid tin inverse segregation, and rough-machine before the spinodal age for best dimensional stability.
What is the maximum service temperature of C96900-TX00?
C96900-TX00 is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C96900-TX00 and C96900-M01?
TX00 is the default condition — standard commercial hardened condition — best balance of ~650 MPa yield, wear/galling resistance and residual ductility for bearings, bushings and valve parts. M01: soft as-cast sand castings, ordered when the part will be spinodally aged after rough machining or when maximum ductility is wanted. Yield strength is 655 MPa in TX00 versus 240 MPa in M01.
Sources
- ASTM B505/B505M — Continuous Cast Copper Alloy Castings — ASTM International (2018)
- ASTM B929 — Copper-Nickel-Tin Spinodal Alloy Castings — ASTM International (2020)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- ToughMet 3 CX (UNS C96900) cast alloy datasheet — Materion Brush Performance Alloys (2021)
- UNS C96900 alloy record / Copper Alloy Data — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.