Copper Alloy C90300
UNS C90300 · AISI/SAE 622 · ASTM B584 C90300
C90300 is an 88Cu-8Sn-4Zn tin bronze casting alloy covered by ASTM B584 and SAE 622.
Reference datasheet — C90300 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
C90300 tempers and conditions
C90300 is supplied in 5 conditions, soft to hard. M01 is the default FabDigit quotes; the values on this page are for it.
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 |
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?
C90300 is an 88Cu-8Sn-4Zn tin bronze casting alloy covered by ASTM B584 and SAE 622. Castings deliver 145 MPa yield, 310 MPa tensile, 30% elongation and about 70 HB, with 75 W/m·K thermal conductivity, 12% IACS and service to 260 °C, which suits pressure-tight valve bodies, pump housings and fittings in sand, permanent-mold, centrifugal or continuous cast form. It is a foundry alloy only, fusion welds poorly, and lead is limited to 0.3% so chips stay stringy despite a machinability rating of 55. C90500 is the nearest alternative when higher hardness and wear resistance matter more than ductility. C90300 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). C90300 has a yield strength of 145 MPa (21 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 72% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 103 GPa (14.9 Msi).
What is C90300 used for?
- valve bodies
- pump housings
- fittings
- gears
- bearings
Advantages
- Ductile — tolerates forming and impact — 30%, better than 75% of copper alloy grades
- High service temperature — 260°C (500 °F), better than 75% of copper alloy grades
Limitations
- Limited formability — 15/100, worse than 79% of copper alloy grades
C90300 properties
Typical room-temperature values for C90300-M01; bars are the position among copper alloy grades.
Physical3
C90300 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 has a yield strength of 145 MPa (21 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 72% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C90300 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 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 C90300 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's machinability is good (55/100, better than 71% of copper alloy grades); weldability fair (35/100); formability poor (15/100).
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. C90300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C90300
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.
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 |
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.
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 C90300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- AISI / SAE
- 622
- ASTM
- B584 C90300
- Also called
- Alloy 1BNavy-G Bronze
How much does C90300 cost?
C90300 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.
C90300 — frequently asked
What is C90300 used for?
C90300 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?
C90300 has a typical yield strength of 145 MPa (21 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 72% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C90300 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 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?
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 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?
C90300 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.
How much does C90300 cost?
C90300 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 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; 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.