Copper Alloy C91300
UNS C91300
C91300 is a very high-tin cast bronze (approximately 20–23 % Sn) in the C90000–C95999 family, traditionally used for bell casting because of its resonant tone and 240 HB hardness.
Reference datasheet — C91300 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 M01 condition
C91300 tempers and conditions
C91300 is supplied in 4 conditions, soft to hard. M01 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 |
|---|---|---|---|---|---|---|
Cast and annealed / stress-relieved | Low-temperature anneal used by bell founders to relieve casting stresses and stabilise tone before tuning; slightly lower hardness. | 200 | 230 | 1 | 18 HRC | 5.5 % IACS |
M01Default As sand cast | Standard supply condition for bells, gongs and hard bearing blanks; ASTM B22 Alloy A castings. | 210 | 240 | 0.5 | 22 HRC | 5 % IACS |
As centrifugally cast | Choose for cylindrical bushings and rings needing denser, finer structure and slightly higher strength/hardness. | 240 | 270 | 0.5 | 24 HRC | 5 % IACS |
As continuous cast | Bar and tube stock with sound, directionally solidified structure for machined wear parts. | 245 | 275 | 1 | 23 HRC | 5 % IACS |
What is C91300?
C91300 is a very high-tin cast bronze (approximately 20–23 % Sn) in the C90000–C95999 family, traditionally used for bell casting because of its resonant tone and 240 HB hardness. It is chosen where acoustic response and surface hardness outweigh mechanical strength, and is produced by sand, centrifugal and continuous casting. With 0.5 % elongation at 240 MPa tensile the alloy is effectively brittle and not weldable, service is limited to 230 °C, thermal conductivity is 25 W/m·K and electrical conductivity 5 % IACS. C91100 is the nearest alternative where some ductility is required. C91300 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 798°C (1,468 °F). C91300 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 52% of copper alloy grades. Elongation at break is 0.5% and the elastic modulus is 103 GPa (14.9 Msi).
What is C91300 used for?
- bells
- cymbals
- decorative castings
Advantages
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
Limitations
- Limited ductility — 0.5%, worse than 100% of copper alloy grades
- Low fracture toughness — 10 MPa·√m (9.1 ksi·√in), worse than 100% of copper alloy grades
- Limited formability — 3/100, worse than 100% of copper alloy grades
- Poor heat conductor — 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 98% of copper alloy grades
- Difficult to weld — 10/100, worse than 98% of copper alloy grades
C91300 properties
Typical room-temperature values for C91300-M01; bars are the position among copper alloy grades.
Physical3
C91300 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 798°C (1,468 °F).
Mechanical17
C91300 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 52% of copper alloy grades. Elongation at break is 0.5% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C91300 is rated for continuous service to 230°C (446 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 98% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C91300 conducts electricity at 5 % IACS, worse than 95% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C91300 takes about 108 MJ of energy and emits 6.6 kg of CO₂ — more than 97% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C91300's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability not recommended (10/100); formability not recommended (3/100).
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. C91300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C91300
Is C91300 easy to machine?
Machine with sharp carbide tooling, positive rake, rigid setups and slow-to-moderate speeds; chips are short and powdery and the delta phase is abrasive — grinding is often preferred for finishing.
Can C91300 be welded?
Not weldable in practice; repair by low-temperature soft soldering or mechanical means, as fusion welding cracks the brittle delta-phase structure.
Can C91300 be formed, bent or molded?
Cast only — sand, centrifugal or continuous casting with careful gating, generous feeders and slow cooling; no cold or hot forming is possible.
C91300 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 |
|---|---|---|
| Sn | 18 – 20 | 19 |
| Pdeoxidiser; raises hardness | ≤ 1 | 0.3 |
| Niincluding Co | ≤ 0.5 | |
| Pb | ≤ 0.25 | |
| Zn | ≤ 0.25 | |
| Fe | ≤ 0.2 | |
| Sb | ≤ 0.2 | |
| S | ≤ 0.05 | |
| Al | ≤ 0.01 | |
| Si | ≤ 0.01 | |
| CuCu + named elements = 99.4 % min | ≥ 79 (balance) |
What surface finishes work on C91300?
Takes an excellent mirror polish and traditional chemical patinas (liver of sulphur, ammonium-chloride greens); lacquer or wax outdoor pieces, or electroplate for wear surfaces — anodising does not apply.
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 C91300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- Alloy A
- Also called
- Bell Metal
How much does C91300 cost?
C91300 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.
C91300 — frequently asked
What is C91300 used for?
C91300 is typically used for bells, cymbals and decorative castings. In short: traditional bell bronze; hardest high-tin casting; brittle, non-structural alloy.
What is the yield strength of C91300?
C91300 has a typical yield strength of 210 MPa (30.5 ksi) and a tensile strength of 240 MPa (34.8 ksi) — weaker than 52% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C91300 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Machine with sharp carbide tooling, positive rake, rigid setups and slow-to-moderate speeds; chips are short and powdery and the delta phase is abrasive — grinding is often preferred for finishing.
Can C91300 be welded?
Not readily — weldability is rated not recommended (10/100). Not weldable in practice; repair by low-temperature soft soldering or mechanical means, as fusion welding cracks the brittle delta-phase structure.
What surface finishes work on C91300?
Takes an excellent mirror polish and traditional chemical patinas (liver of sulphur, ammonium-chloride greens); lacquer or wax outdoor pieces, or electroplate for wear surfaces — anodising does not apply.
Can C91300 be formed, bent or molded?
Cast only — sand, centrifugal or continuous casting with careful gating, generous feeders and slow cooling; no cold or hot forming is possible.
What is the maximum service temperature of C91300?
C91300 is rated for continuous use to about 230°C (446 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C91300-M01 and C91300-M07?
M01 is the default condition — standard supply condition for bells, gongs and hard bearing blanks; ASTM B22 Alloy A castings. M07: bar and tube stock with sound, directionally solidified structure for machined wear parts. Yield strength is 210 MPa in M01 versus 245 MPa in M07.
How much does C91300 cost?
C91300 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 B22 — Bronze Castings for Bridges and Turntables (Alloy A / C91300) — ASTM International (2023)
- CDA Alloy Datasheet C91300 (high-tin bell metal) — Copper Development Association (2024)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper and Copper Alloy Castings — Foundry and Property Data — ASM International (2001)
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.