Copper Alloy C91300-TQ50
Supply condition
UNS C91300
TQ50 = cast and annealed / stress-relieved
Low-temperature anneal used by bell founders to relieve casting stresses and stabilise tone before tuning; slightly lower hardness.
Values for the TQ50 condition
Other C91300 tempers and conditions
C91300 is listed in 4 conditions; see the grade overview at C91300.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
TQ50This page 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-TQ50?
C91300-TQ50 is C91300 supplied in the TQ50 condition — low-temperature anneal used by bell founders to relieve casting stresses and stabilise tone before tuning; slightly lower hardness. C91300-TQ50 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 54% of copper alloy grades. Elongation at break is 1% and the elastic modulus is 103 GPa (14.9 Msi). C91300-TQ50 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). M01 is the default condition FabDigit quotes; TQ50 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
Limitations
- Limited formability — 4/100, worse than 100% of copper alloy grades
- Limited ductility — 1%, worse than 99% of copper alloy grades
- Poor heat conductor — 26 W/m·K (15 BTU/hr·ft·°F), worse than 98% of copper alloy grades
- Difficult to weld — 10/100, worse than 98% of copper alloy grades
- Low fracture toughness — 11 MPa·√m (10 ksi·√in), worse than 97% of copper alloy grades
C91300-TQ50 properties
Typical room-temperature values for C91300-TQ50; 23 are specific to this condition. Other listed values are C91300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C91300-TQ50 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-TQ50 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 54% of copper alloy grades. Elongation at break is 1% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C91300-TQ50 is rated for continuous service to 230°C (446 °F). It conducts heat at 26 W/m·K (15 BTU/hr·ft·°F), worse than 98% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C91300-TQ50 conducts electricity at 5.5 % 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-TQ50 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-TQ50's machinability is poor (28/100, worse than 78% of copper alloy grades); weldability not recommended (10/100); formability not recommended (4/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C91300-TQ50
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.
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.
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) | — |
C91300-TQ50 — frequently asked
What is C91300-TQ50 used for?
C91300-TQ50 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-TQ50?
C91300-TQ50 has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 54% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C91300-TQ50 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 78% 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-TQ50 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-TQ50?
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-TQ50 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-TQ50?
C91300-TQ50 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.