Copper Alloy C96300-SR (Stress relieved)
Heat-treated state
UNS C96300
Use when machining distortion or residual-stress-driven cracking must be minimized before service.
Values for the SR condition
Other C96300 tempers and conditions
C96300 is listed in 5 conditions; see the grade overview at C96300.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRThis page Stress relieved | Use when machining distortion or residual-stress-driven cracking must be minimized before service. | 250 | 455 | 22 | 130 HB | 7 % IACS |
M01Default As sand cast | Standard as-cast sand casting condition for valve bodies, pump casings and marine fittings. | 275 | 470 | 18 | 140 HB | 6.5 % IACS |
As pressure die cast | For small, near-net-shape marine components where surface finish and dimensional accuracy matter. | 280 | 480 | 18 | 145 HB | 6.5 % IACS |
As continuous cast | Continuous-cast bar/tube stock for machined marine hardware; sound, uniform structure. | 285 | 490 | 20 | 145 HB | 6.5 % IACS |
As centrifugally cast | Pick for tubular/ring shapes needing denser, finer-grained metal and slightly higher strength. | 290 | 500 | 20 | 150 HB | 6.5 % IACS |
What is C96300-SR?
C96300-SR is C96300 heat treated to SR — use when machining distortion or residual-stress-driven cracking must be minimized before service. C96300-SR has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 54% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 145 GPa (21 Msi). C96300-SR has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,165°C (2,129 °F). M01 is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- Stiff — 145 GPa (21 Msi), better than 97% of copper alloy grades
- Good corrosion resistance — 80/100, better than 96% of copper alloy grades
- High service temperature — 315°C (599 °F), better than 92% of copper alloy grades
- Readily welded — 78/100, better than 91% of copper alloy grades
Limitations
- High embodied carbon — 6.5 kg CO₂/kg, worse than 94% of copper alloy grades
- Poor heat conductor — 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 88% of copper alloy grades
- Low electrical conductivity — 7 % IACS, worse than 86% of copper alloy grades
C96300-SR properties
Typical room-temperature values for C96300-SR; 21 are specific to this condition. Other listed values are C96300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C96300-SR has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,165°C (2,129 °F).
Mechanical15
C96300-SR has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 54% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 145 GPa (21 Msi).
Thermal6
C96300-SR is rated for continuous service to 315°C (599 °F). It conducts heat at 34 W/m·K (19.6 BTU/hr·ft·°F), worse than 88% of copper alloy grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
C96300-SR conducts electricity at 7 % IACS, worse than 86% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 96% of copper alloy grades.
Sustainability4
Producing a kilogram of C96300-SR takes about 78 MJ of energy and emits 6.5 kg of CO₂ — more than 90% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C96300-SR's machinability is poor (26/100, worse than 81% of copper alloy grades); weldability very good (78/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C96300-SR
Is C96300 easy to machine?
Gummy and work-hardening — use sharp, positive-rake carbide, heavy positive feed, rigid setups and generous coolant; avoid dwelling.
Can C96300 be welded?
Readily GTAW/GMAW welded with 70-30 type Cu-Ni filler (ERCuNi); keep surfaces free of sulfur/oil, use low heat input and no preheat.
Can C96300 be formed, bent or molded?
Cast product only — requires clean, deoxidized melt (Nb/Mn/Si control), high pouring temperature and heavy risering to avoid shrinkage porosity.
What surface finishes work on C96300?
Not anodizable; pickle/passivate, then leave bare for seawater (self-healing oxide) or apply epoxy/antifouling-compatible coatings; polishes to a bright, tarnish-resistant finish.
C96300 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 |
|---|---|---|
| Niincludes Co | 18 – 22 | 20 |
| Fe | 0.5 – 1.5 | 1 |
| Mn | 0.25 – 1.5 | 0.8 |
| Nbcolumbium, strengthener/deoxidizer | 0.5 – 1.5 | 1 |
| Si | ≤ 0.15 | 0.1 |
| C | ≤ 0.15 | 0.05 |
| S | ≤ 0.02 | — |
| P | ≤ 0.02 | — |
| Pb | ≤ 0.01 | — |
| Curemainder, nominally ~76% | balance | — |
C96300-SR — frequently asked
What is C96300-SR used for?
C96300-SR is typically used for marine valve trim, pump impellers and industrial seawater fittings. In short: mid-nickel cast Cu-Ni; weldable seawater castings; between 90-10 and 70-30.
What is the yield strength of C96300-SR?
C96300-SR has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 54% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C96300-SR easy to machine?
Not especially — machinability is rated poor (26/100, worse than 81% of copper alloy grades). Gummy and work-hardening — use sharp, positive-rake carbide, heavy positive feed, rigid setups and generous coolant; avoid dwelling.
Can C96300-SR be welded?
Yes — weldability is rated very good (78/100). Readily GTAW/GMAW welded with 70-30 type Cu-Ni filler (ERCuNi); keep surfaces free of sulfur/oil, use low heat input and no preheat.
What surface finishes work on C96300-SR?
Not anodizable; pickle/passivate, then leave bare for seawater (self-healing oxide) or apply epoxy/antifouling-compatible coatings; polishes to a bright, tarnish-resistant finish.
Can C96300-SR be formed, bent or molded?
Cast product only — requires clean, deoxidized melt (Nb/Mn/Si control), high pouring temperature and heavy risering to avoid shrinkage porosity.
What is the maximum service temperature of C96300-SR?
C96300-SR is rated for continuous use to about 315°C (599 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C96300-M01 and C96300-SR?
M01 is the default condition — standard as-cast sand casting condition for valve bodies, pump casings and marine fittings. SR: use when machining distortion or residual-stress-driven cracking must be minimized before service. Yield strength is 275 MPa in M01 versus 250 MPa in SR.
Sources
- ASTM B369 — Copper-Nickel Alloy Castings — ASTM International (2021)
- CDA Alloy Database — Cast Copper-Nickel Alloys (C96xxx) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Guide to the Use of Copper-Nickel Alloys in Marine Service — Nickel Institute / CDA (2018)
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.