Copper Alloy C93400
UNS C93400
C93400 is a medium-leaded tin bronze casting alloy from the C90000–C95999 family, balancing strength, free-cutting behaviour and bearing performance.
Reference datasheet — C93400 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.
Values for the M07 condition
C93400 tempers and conditions
C93400 is supplied in 4 conditions, soft to hard. M07 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As sand cast | Choose for one-off or complex-shaped bearing housings, glands and pump parts; lowest cost tooling, slightly lower properties. | 103 | 207 | 20 | 55 HB | 12 % IACS |
As plaster cast | Medium-volume small parts needing tighter dimensions and a finer as-cast grain than sand casting. | 124 | 228 | 16 | 60 HB | 12 % IACS |
As centrifugally cast | Use for large-diameter sleeves and rings where a dense, inclusion-free wall is needed. | 128 | 234 | 16 | 62 HB | 12 % IACS |
M07Default As continuous cast | Standard stock form for bushings and thrust washers — densest structure and highest strength of the casting routes. | 138 | 241 | 15 | 65 HB | 12 % IACS |
What is C93400?
C93400 is a medium-leaded tin bronze casting alloy from the C90000–C95999 family, balancing strength, free-cutting behaviour and bearing performance. Default-condition values are 138 MPa yield, 241 MPa tensile, 15 % elongation and 65 HB, with service limited to 200 °C — the lowest of the leaded tin bronzes here. It is cast by sand, permanent-mold and centrifugal routes into bushings, bearings and wear-resistant parts. The high lead content rules out fusion welding and prevents a true mirror polish; C92700 is the nearest alternative when higher hardness is wanted. C93400 has a density of 8.95 g/cm³ (0.323 lb/in³), heavier than 98% of copper alloy grades. It melts at 854°C (1,569 °F). C93400 has a yield strength of 138 MPa (20 ksi) and a tensile strength of 241 MPa (35 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 97 GPa (14.1 Msi).
What is C93400 used for?
- bushings
- bearings
- wear-resistant castings
Advantages
- Easy to machine — 88/100, better than 96% of copper alloy grades
Limitations
- Hard to polish — 55/100, worse than 97% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Low stiffness — 97 GPa (14.1 Msi), worse than 88% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Low strength — 138 MPa (20 ksi), worse than 76% of copper alloy grades
C93400 properties
Typical room-temperature values for C93400-M07; bars are the position among copper alloy grades.
Physical3
C93400 has a density of 8.95 g/cm³ (0.323 lb/in³), heavier than 98% of copper alloy grades. It melts at 854°C (1,569 °F).
Mechanical14
C93400 has a yield strength of 138 MPa (20 ksi) and a tensile strength of 241 MPa (35 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C93400 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 µm/m·K (10 µin/in·°F).
Electrical3
C93400 conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 64% of copper alloy grades.
Sustainability4
Producing a kilogram of C93400 takes about 50 MJ of energy and emits 3.6 kg of CO₂ — less than 89% of copper alloy grades. Typical recycled content is 75%.
Manufacturability8
C93400's machinability is excellent (88/100, better than 96% of copper alloy grades); weldability poor (20/100); formability not recommended (10/100).
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. C93400 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C93400
Is C93400 easy to machine?
Excellent free-cutting behaviour (~80 % of C36000); use sharp positive-rake tools, light feeds and flood coolant to avoid smearing the lead phase, chips break short.
Can C93400 be welded?
Poor fusion weldability because of the high lead content; join by soldering or low-temperature brazing, or mechanically fit sleeves rather than welding.
Can C93400 be formed, bent or molded?
Casting alloy only — very fluid with a wide freezing range; needs directional solidification, generous risering and chills to avoid tin/lead inverse segregation and micro-shrinkage; not cold formable.
C93400 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 |
|---|---|---|
| Cu | 82 – 85 | 84 |
| Sn | 7 – 9 | 8 |
| Pbfree lead phase provides bearing/lubricity behaviour | 7 – 9 | 8 |
| Zn | ≤ 0.8 | |
| NiNi + Co | ≤ 1 | |
| Fe | ≤ 0.2 | |
| Sb | ≤ 0.5 | |
| S | ≤ 0.08 | |
| Phigher P (up to ~1.5 %) permitted for continuous-cast bearing product | ≤ 0.15 | |
| Al | ≤ 0.01 | |
| Si | ≤ 0.01 |
What surface finishes work on C93400?
Machined or ground finishes are usual; can be tin, nickel or chrome plated after careful cleaning, and takes a satin polish, but the lead phase prevents a true mirror finish.
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).
How much does C93400 cost?
C93400 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.
C93400 — frequently asked
What is C93400 used for?
C93400 is typically used for bushings, bearings and wear-resistant castings. In short: medium-leaded bearing bronze; excellent free-cutting behaviour; lower service temperature.
What is the yield strength of C93400?
C93400 has a typical yield strength of 138 MPa (20 ksi) and a tensile strength of 241 MPa (35 ksi) — weaker than 76% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C93400 easy to machine?
Yes — machinability is rated excellent (88/100, better than 96% of copper alloy grades). Excellent free-cutting behaviour (~80 % of C36000); use sharp positive-rake tools, light feeds and flood coolant to avoid smearing the lead phase, chips break short.
Can C93400 be welded?
Not readily — weldability is rated poor (20/100). Poor fusion weldability because of the high lead content; join by soldering or low-temperature brazing, or mechanically fit sleeves rather than welding.
What surface finishes work on C93400?
Machined or ground finishes are usual; can be tin, nickel or chrome plated after careful cleaning, and takes a satin polish, but the lead phase prevents a true mirror finish.
Can C93400 be formed, bent or molded?
Casting alloy only — very fluid with a wide freezing range; needs directional solidification, generous risering and chills to avoid tin/lead inverse segregation and micro-shrinkage; not cold formable.
What is the maximum service temperature of C93400?
C93400 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.
What is the difference between C93400-M07 and C93400-M01?
M07 is the default condition — standard stock form for bushings and thrust washers — densest structure and highest strength of the casting routes. M01: choose for one-off or complex-shaped bearing housings, glands and pump parts; lowest cost tooling, slightly lower properties. Yield strength is 138 MPa in M07 versus 103 MPa in M01.
How much does C93400 cost?
C93400 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 Alloy Castings — ASTM International (2018)
- ASTM B584 — Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- Copper Alloy C93400 property sheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 1176 (comparable ZCuSn5Pb5Zn5 / ZCuPb10Sn10 grades) (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.