Copper Alloy C90300-M02
Heat-treated state
UNS C90300 · AISI/SAE 622 · ASTM B584 C90300
M02 = as centrifugally cast
Choose for rings, sleeves, bushings and large bearing shells needing dense, porosity-free walls (ASTM B271).
Values for the M02 condition
Other C90300 tempers and conditions
C90300 is listed in 5 conditions; see the grade overview at C90300.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As investment cast | Investment casting for small, intricate near-net-shape parts where machining allowance must be minimal. | 140 | 295 | 25 | 70 HB | 12 % IACS |
M01Default As sand cast | Standard ASTM B584 sand casting condition for valve bodies, pump housings and general pressure castings. | 145 | 310 | 30 | 70 HB | 12 % IACS |
M02This page As centrifugally cast | Choose for rings, sleeves, bushings and large bearing shells needing dense, porosity-free walls (ASTM B271). | 155 | 330 | 25 | 75 HB | 12 % IACS |
As plaster cast | Permanent-mold castings for repeat parts with better surface and slightly higher strength than sand casting. | 160 | 325 | 20 | 75 HB | 12 % IACS |
As continuous cast | Continuous-cast bar/tube stock (ASTM B505) with the finest structure and highest yield strength — best for machined bushings and worm gears. | 172 | 330 | 16 | 80 HB | 12 % IACS |
What is C90300-M02?
C90300-M02 is C90300 heat treated to M02 — choose for rings, sleeves, bushings and large bearing shells needing dense, porosity-free walls (ASTM B271). C90300-M02 has a yield strength of 155 MPa (22.5 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 65% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 105 GPa (15.2 Msi). C90300-M02 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 854°C (1,569 °F). M01 is the default condition FabDigit quotes; M02 is available on request or by drawing note.
Advantages
- High service temperature — 260°C (500 °F), better than 75% of copper alloy grades
Limitations
- Limited formability — 12/100, worse than 85% of copper alloy grades
C90300-M02 properties
Typical room-temperature values for C90300-M02; 21 are specific to this condition. Other listed values are C90300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C90300-M02 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 854°C (1,569 °F).
Mechanical12
C90300-M02 has a yield strength of 155 MPa (22.5 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 65% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
C90300-M02 is rated for continuous service to 260°C (500 °F). It conducts heat at 75 W/m·K (43.3 BTU/hr·ft·°F), better than 50% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C90300-M02 conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 69% of copper alloy grades.
Sustainability4
Producing a kilogram of C90300-M02 takes about 60 MJ of energy and emits 4 kg of CO₂ — more than 69% of copper alloy grades. Typical recycled content is 75%.
Manufacturability7
C90300-M02's machinability is good (55/100, better than 71% of copper alloy grades); weldability fair (35/100); formability not recommended (12/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C90300-M02
Is C90300 easy to machine?
Machines readily (≈30 % of free-cutting brass) with sharp positive-rake carbide or HSS tools, high speed, light feed and soluble-oil coolant; chips are somewhat stringy because Pb is limited to 0.3 %.
Can C90300 be welded?
Soldering and brazing are excellent; GTAW/oxyfuel repair welding with phosphor-bronze filler needs 150–250 °C preheat and slow cooling to avoid hot cracking from tin segregation.
Can C90300 be formed, bent or molded?
Foundry alloy only — cast in sand, permanent mold, centrifugal or continuous form with generous risering because of the wide freezing range; not cold-formable.
What surface finishes work on C90300?
Takes a good buffed or satin finish and accepts chemical patina, tin, nickel or chrome plating; no anodizing — protect decorative surfaces with lacquer.
C90300 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 |
|---|---|---|
| CuCu + named elements ≥ 99.4 % | 86 – 89 | 88 |
| Sn | 7.5 – 9 | 8 |
| Zn | 3 – 5 | 4 |
| Pb | ≤ 0.3 | 0.15 |
| Niincluding Co | ≤ 1 | — |
| Fe | ≤ 0.2 | — |
| Sb | ≤ 0.2 | — |
| S | ≤ 0.05 | — |
| P | ≤ 0.05 | — |
| Si | ≤ 0.01 | — |
| Al | ≤ 0.01 | — |
C90300-M02 — frequently asked
What is C90300-M02 used for?
C90300-M02 is typically used for valve bodies, pump housings, fittings, gears and bearings. In short: pressure-tight tin bronze; good strength and ductility; standard valve casting alloy.
What is the yield strength of C90300-M02?
C90300-M02 has a typical yield strength of 155 MPa (22.5 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 65% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C90300-M02 easy to machine?
Reasonably — machinability is rated good (55/100, better than 71% of copper alloy grades). Machines readily (≈30 % of free-cutting brass) with sharp positive-rake carbide or HSS tools, high speed, light feed and soluble-oil coolant; chips are somewhat stringy because Pb is limited to 0.3 %.
Can C90300-M02 be welded?
With care — weldability is rated fair (35/100). Soldering and brazing are excellent; GTAW/oxyfuel repair welding with phosphor-bronze filler needs 150–250 °C preheat and slow cooling to avoid hot cracking from tin segregation.
What surface finishes work on C90300-M02?
Takes a good buffed or satin finish and accepts chemical patina, tin, nickel or chrome plating; no anodizing — protect decorative surfaces with lacquer.
Can C90300-M02 be formed, bent or molded?
Foundry alloy only — cast in sand, permanent mold, centrifugal or continuous form with generous risering because of the wide freezing range; not cold-formable.
What is the maximum service temperature of C90300-M02?
C90300-M02 is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C90300-M01 and C90300-M07?
M01 is the default condition — standard ASTM B584 sand casting condition for valve bodies, pump housings and general pressure castings. M07: continuous-cast bar/tube stock (ASTM B505) with the finest structure and highest yield strength — best for machined bushings and worm gears. Yield strength is 145 MPa in M01 versus 172 MPa in M07.
Sources
- ASTM B584 — Standard Specification for Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- ASTM B271/B271M — Copper-Base Alloy Centrifugal Castings — ASTM International (2019)
- CDA Alloy C90300 property datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.