Copper Alloy C93700-CF (Centrifugal cast)
Reinforced grade
UNS C93700
Best for large-diameter thin-wall sleeves and thrust rings needing sound, porosity-free walls.
Values for the CF condition
Other C93700 tempers and conditions
C93700 is listed in 3 conditions; see the grade overview at C93700.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast, as-cast | Choose for large, complex or one-off bearing housings and pump parts where a pattern is cheaper than machining from bar. | 124 | 241 | 20 | 55 HB | 10 % IACS |
CFThis page Centrifugal cast | Best for large-diameter thin-wall sleeves and thrust rings needing sound, porosity-free walls. | 138 | 276 | 15 | 60 HB | 10 % IACS |
Permanent mold / chill cast | Medium-volume small bushings and washers; chilling refines the structure for slightly higher hardness than sand casting. | 145 | 255 | 14 | 62 HB | 10 % IACS |
What is C93700-CF?
C93700-CF is C93700 in the CF grade — best for large-diameter thin-wall sleeves and thrust rings needing sound, porosity-free walls. C93700-CF has a yield strength of 138 MPa (20 ksi) and a tensile strength of 276 MPa (40 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 77 GPa (11.2 Msi). C93700-CF has a density of 8.93 g/cm³ (0.323 lb/in³), heavier than 82% of copper alloy grades. It melts at 762°C (1,404 °F).
Advantages
- Easy to machine — 85/100, better than 93% of copper alloy grades
Limitations
- Limited formability — 5/100, worse than 98% of copper alloy grades
- Low stiffness — 77 GPa (11.2 Msi), worse than 97% of copper alloy grades
- Difficult to weld — 12/100, worse than 96% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Low strength — 138 MPa (20 ksi), worse than 76% of copper alloy grades
C93700-CF properties
Typical room-temperature values for C93700-CF; 19 are specific to this condition. Other listed values are C93700 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C93700-CF has a density of 8.93 g/cm³ (0.323 lb/in³), heavier than 82% of copper alloy grades. It melts at 762°C (1,404 °F).
Mechanical12
C93700-CF has a yield strength of 138 MPa (20 ksi) and a tensile strength of 276 MPa (40 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 77 GPa (11.2 Msi).
Thermal6
C93700-CF is rated for continuous service to 200°C (392 °F). It conducts heat at 47 W/m·K (27.2 BTU/hr·ft·°F), worse than 69% of copper alloy grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
C93700-CF conducts electricity at 10 % IACS, worse than 74% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C93700-CF takes about 58 MJ of energy and emits 3.8 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 60%.
Manufacturability8
C93700-CF's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability not recommended (12/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C93700-CF
Is C93700 easy to machine?
Free-machining with the lead phase acting as a chip breaker (≈80% of AISI 1212); use sharp positive-rake tools, high speed, light feed and flood coolant, and control lead dust/fume.
Can C93700 be welded?
Fusion welding is not recommended — lead causes hot cracking and porosity; join by soft soldering, mechanical press-fit or adhesive, and braze only with low-temperature filler when unavoidable.
Can C93700 be formed, bent or molded?
A casting alloy only: excellent fluidity for sand, permanent-mold, centrifugal and continuous casting; feed risers well as the long freezing range (762–930 °C) promotes interdendritic shrinkage. No cold forming.
What surface finishes work on C93700?
Turns and bores to fine surface finishes; lead smearing limits mirror polishing. Not anodizable — can be tin- or nickel-plated, chemically patinated, or left as-machined for bearing running surfaces.
C93700 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 |
|---|---|---|
| Cumatrix | 78 – 82 | 80 |
| Sn | 9 – 11 | 10 |
| Pbfree lead phase — lubricity/embeddability | 8 – 11 | 10 |
| Zn | ≤ 0.8 | 0.3 |
| Fe0.15 max for sand cast (ASTM B584); 0.7 max continuous cast (B505) | ≤ 0.7 | 0.15 |
| Sb | ≤ 0.5 | — |
| NiNi + Co | ≤ 0.5 | — |
| P0.10 max sand cast; up to 1.5 max continuous cast | ≤ 1.5 | 0.05 |
| S | ≤ 0.08 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
C93700-CF — frequently asked
What is C93700-CF used for?
C93700-CF is typically used for bushings, thrust bearings and high-load bearings. In short: high-load conformable bearing bronze; free-machining, ~80 % of 1212; 200 °C service ceiling.
What is the yield strength of C93700-CF?
C93700-CF has a typical yield strength of 138 MPa (20 ksi) and a tensile strength of 276 MPa (40 ksi) — weaker than 76% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C93700-CF easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Free-machining with the lead phase acting as a chip breaker (≈80% of AISI 1212); use sharp positive-rake tools, high speed, light feed and flood coolant, and control lead dust/fume.
Can C93700-CF be welded?
Not readily — weldability is rated not recommended (12/100). Fusion welding is not recommended — lead causes hot cracking and porosity; join by soft soldering, mechanical press-fit or adhesive, and braze only with low-temperature filler when unavoidable.
What surface finishes work on C93700-CF?
Turns and bores to fine surface finishes; lead smearing limits mirror polishing. Not anodizable — can be tin- or nickel-plated, chemically patinated, or left as-machined for bearing running surfaces.
Can C93700-CF be formed, bent or molded?
A casting alloy only: excellent fluidity for sand, permanent-mold, centrifugal and continuous casting; feed risers well as the long freezing range (762–930 °C) promotes interdendritic shrinkage. No cold forming.
What is the maximum service temperature of C93700-CF?
C93700-CF is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM B505/B505M — Continuous Cast Copper Alloys — ASTM International (2022)
- ASTM B584 — Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B271 — Copper-Base Alloy Centrifugal Castings — ASTM International (2020)
- CDA Alloy Datasheet C93700 (SAE 64 high-leaded tin bronze) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 1176 (ZCuPb15Sn8 ) (2013)
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.