Copper Alloy C93700
UNS C93700
C93700 is a high-leaded tin bronze (ZCuPb15Sn8) from the cast bronze family, in which about 15 % lead provides conformability, embedability and anti-seizure behaviour under heavy loads.
Reference datasheet — C93700 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
C93700 tempers and conditions
C93700 is supplied in 3 conditions, soft to hard.
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 |
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 |
Supply forms, finishes and certifications
Ways C93700 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CCDefault | Continuous cast | Surface finish |
What is C93700?
C93700 is a high-leaded tin bronze (ZCuPb15Sn8) from the cast bronze family, in which about 15 % lead provides conformability, embedability and anti-seizure behaviour under heavy loads. Engineers choose it for heavily loaded bushings and thrust bearings, supplied as sand, permanent-mold, centrifugal and continuous castings with 262 MPa tensile strength, 152 MPa yield, 12 % elongation and 65 HB. Service temperature is limited to about 200 °C, fusion welding is not recommended, and elongation is lower than lower-lead grades such as C93500. C93700 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). C93700 has a yield strength of 152 MPa (22 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 67% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 76 GPa (11 Msi).
What is C93700 used for?
- bushings
- thrust bearings
- high-load bearings
Advantages
- Easy to machine — 85/100, better than 93% of copper alloy grades
Limitations
- Low stiffness — 76 GPa (11 Msi), worse than 98% of copper alloy grades
- Limited formability — 5/100, worse than 98% 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
C93700 properties
Typical room-temperature values; bars are the position among copper alloy grades.
Physical3
C93700 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 has a yield strength of 152 MPa (22 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 67% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 76 GPa (11 Msi).
Thermal6
C93700 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 conducts electricity at 10 % IACS, worse than 74% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C93700 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's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability not recommended (12/100); formability not recommended (5/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C93700 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C93700
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.
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 |
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.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C93700 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Other
- CC495K
- Similar grades
- ZCuPb15Sn8
How much does C93700 cost?
C93700 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C93700 — frequently asked
What is C93700 used for?
C93700 is typically used for bushings, thrust bearings and high-load bearings. In short: high-load conformable bearing bronze; free-machining, ~80 % of 1212; 200 °C service ceiling.
What is the yield strength of C93700?
C93700 has a typical yield strength of 152 MPa (22 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 67% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C93700 easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Free-machining with the lead phase acting as a chip breaker (≈80% of AISI 1212); use sharp positive-rake tools, high speed, light feed and flood coolant, and control lead dust/fume.
Can C93700 be welded?
Not readily — weldability is rated not recommended (12/100). Fusion welding is not recommended — lead causes hot cracking and porosity; join by soft soldering, mechanical press-fit or adhesive, and braze only with low-temperature filler when unavoidable.
What surface finishes work on C93700?
Turns and bores to fine surface finishes; lead smearing limits mirror polishing. Not anodizable — can be tin- or nickel-plated, chemically patinated, or left as-machined for bearing running surfaces.
Can C93700 be formed, bent or molded?
A casting alloy only: excellent fluidity for sand, permanent-mold, centrifugal and continuous casting; feed risers well as the long freezing range (762–930 °C) promotes interdendritic shrinkage. No cold forming.
What is the maximum service temperature of C93700?
C93700 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does C93700 cost?
C93700 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.