Copper Alloy C62300-TQ50
Supply condition
UNS C62300 · ASTM B150, B169
TQ50 = quench hardened and temper annealed
Heat-treated condition for maximum hardness and wear resistance in bearings, wear rings and forming dies; ductility is reduced.
Values for the TQ50 condition
Other C62300 tempers and conditions
C62300 is listed in 7 conditions; see the grade overview at C62300.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Less common softened condition used to recover some ductility before limited forming or as a starting point for redrawing. | 215 | 515 | 32 | 135 HB | 12 % IACS |
As hot forged and air cooled | Pick for forged flanges, valve bodies and near-net shapes where uniform properties through thick sections matter more than peak strength. | 255 | 565 | 25 | 150 HB | — |
As hot rolled | Standard condition for ASTM B169 plate and flat bar used for wear plates, gibs and machined structural parts. | 275 | 585 | 22 | 155 HB | — |
M30Default As hot extruded | The default stocked condition: hot-extruded rod and shapes with a good strength/ductility balance for general machining. | 290 | 585 | 25 | 160 HB | 12 % IACS |
Drawn and stress relieved | Choose when high yield strength must be combined with dimensional stability after machining (valve stems, pump shafts, studs). | 415 | 655 | 15 | 180 HB | — |
TQ50This page Quench hardened and temper annealed | Heat-treated condition for maximum hardness and wear resistance in bearings, wear rings and forming dies; ductility is reduced. | 415 | 690 | 14 | 17 HRC | — |
Full hard | Cold-drawn small-diameter bar for shafts and fasteners needing higher yield strength and better surface finish; residual stress remains. | 435 | 655 | 12 | 187 HB | — |
What is C62300-TQ50?
C62300-TQ50 is C62300 supplied in the TQ50 condition — heat-treated condition for maximum hardness and wear resistance in bearings, wear rings and forming dies; ductility is reduced. C62300-TQ50 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 82% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 117 GPa (17 Msi). C62300-TQ50 has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 91% of copper alloy grades. It melts at 1,040°C (1,904 °F). M30 is the default condition FabDigit quotes; TQ50 is available on request or by drawing note.
Advantages
- Lightweight — 7.65 g/cm³ (0.276 lb/in³), better than 91% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- Readily welded — 70/100, better than 85% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
- High strength — 415 MPa (60.2 ksi), better than 82% of copper alloy grades
Limitations
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Poor heat conductor — 39.8 W/m·K (23 BTU/hr·ft·°F), worse than 83% of copper alloy grades
C62300-TQ50 properties
Typical room-temperature values for C62300-TQ50; 12 are specific to this condition. Other listed values are C62300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C62300-TQ50 has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 91% of copper alloy grades. It melts at 1,040°C (1,904 °F).
Mechanical13
C62300-TQ50 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 82% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C62300-TQ50 is rated for continuous service to 300°C (572 °F). It conducts heat at 39.8 W/m·K (23 BTU/hr·ft·°F), worse than 83% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C62300-TQ50 conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 84% of copper alloy grades.
Sustainability4
Producing a kilogram of C62300-TQ50 takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C62300-TQ50's machinability is fair (38/100, better than 55% of copper alloy grades); weldability very good (70/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C62300-TQ50
Is C62300 easy to machine?
Machines like a tough medium-strength bronze at roughly half the rate of free-cutting brass: use rigid setups, sharp carbide, positive rake, moderate speed with high feed and flood coolant to avoid work-hardened glazing.
Can C62300 be welded?
GTAW/GMAW with aluminium-bronze filler (ERCuAl-A2) works well; keep interpass temperature low, remove the tenacious alumina film mechanically and avoid oxyacetylene welding and soft soldering.
Can C62300 be formed, bent or molded?
Hot work at 750–900 °C (forge, extrude, hot bend); cold formability is poor, so limit cold bending and stress-relieve at 400–500 °C after drawing or heavy machining.
What surface finishes work on C62300?
Not anodisable; takes a bright golden polish, can be buffed, shot-peened for fatigue life, or chemically darkened. Nickel/chrome plating requires careful activation of the oxide film.
C62300 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 |
|---|---|---|
| Al | 8.5 – 11 | 9.3 |
| Fegrain refinement, κ-phase former | 2 – 4 | 3 |
| NiNi + Co counted together | ≤ 1 | — |
| Mn | ≤ 0.5 | — |
| Sn | ≤ 0.6 | — |
| Si | ≤ 0.25 | — |
| Curemainder, Cu + named elements ≥ 99.5 % | ≥ 82.2 (balance) | — |
C62300-TQ50 — frequently asked
What is C62300-TQ50 used for?
C62300-TQ50 is typically used for gears, bearings, marine hardware, wear plates and valve stems. In short: best-machining aluminum bronze; gear and bearing bronze; highest conductivity in series.
What is the yield strength of C62300-TQ50?
C62300-TQ50 has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 82% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C62300-TQ50 easy to machine?
Not especially — machinability is rated fair (38/100, better than 55% of copper alloy grades). Machines like a tough medium-strength bronze at roughly half the rate of free-cutting brass: use rigid setups, sharp carbide, positive rake, moderate speed with high feed and flood coolant to avoid work-hardened glazing.
Can C62300-TQ50 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW with aluminium-bronze filler (ERCuAl-A2) works well; keep interpass temperature low, remove the tenacious alumina film mechanically and avoid oxyacetylene welding and soft soldering.
What surface finishes work on C62300-TQ50?
Not anodisable; takes a bright golden polish, can be buffed, shot-peened for fatigue life, or chemically darkened. Nickel/chrome plating requires careful activation of the oxide film.
Can C62300-TQ50 be formed, bent or molded?
Hot work at 750–900 °C (forge, extrude, hot bend); cold formability is poor, so limit cold bending and stress-relieve at 400–500 °C after drawing or heavy machining.
What is the maximum service temperature of C62300-TQ50?
C62300-TQ50 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C62300-M30 and C62300-H04?
M30 is the default condition — the default stocked condition: hot-extruded rod and shapes with a good strength/ductility balance for general machining. H04: cold-drawn small-diameter bar for shafts and fasteners needing higher yield strength and better surface finish; residual stress remains. Yield strength is 290 MPa in M30 versus 435 MPa in H04.
Sources
- ASTM B150/B150M — Aluminum Bronze Rod, Bar, and Shapes — ASTM International (2019)
- ASTM B169/B169M — Aluminum Bronze Plate, Sheet, Strip and Rolled Bar — ASTM International (2019)
- CDA Alloy Datasheet C62300 (copper.org) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 1176 / GB/T 4423 QAl9-4 — SAC (2020)
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.