Direct Answer: When selecting copper-base casting alloys, C95400 (11% Al, 4% Fe aluminum bronze) and C95800 (nickel-aluminum bronze, NAB) deliver high tensile strength (515–585 MPa), cavitation resistance, and heavy-load galling protection for marine propellers, seawater valves, and worm gears; C83600 (85-5-5-5 leaded red brass / gunmetal) provides superior pressure tightness and solderability for low-to-medium pressure pump and plumbing bodies; and C93200 (SAE 660) high-leaded tin bronze is the industry benchmark for anti-friction bushings and sleeve bearings.
Direct Foundry & CNC Manufacturing — Pingdu, Qingdao
Qingdao Yucheng Machine (YCUMETAL) operates a 34,000 m² integrated casting and CNC machining facility in Pingdu, Qingdao (approx. 50 km from Qingdao Port). We pour and finish-machine stainless steel, carbon & alloy steel, ductile/grey iron, aluminum, and copper/bronze alloys across silica-sol investment casting, sand casting, lost foam, gravity, and low-pressure casting.
✓ IATF 16949 & ISO 9001 Certified | ✓ EN 10204 3.1 MTR + Spectrometer, Industrial CT & CMM Inspection | ✓ 24h Engineering DFM & Quote
1. Chemical Composition & Mechanical Properties: C95400 vs C95800 vs C83600 vs C93200
Below is the engineering specification matrix across ASTM B148 (sand/centrifugal aluminum bronze), ASTM B584 (sand cast copper alloys), and ASTM B271, cross-referenced with European EN 1982 equivalents:
| UNS / Common Grade | EN 1982 / DIN Equivalent | Nominal Chemistry (wt.%) | Min Tensile / Yield (MPa) | Elongation / Hardness (HB) | Primary Engineering Role |
|---|---|---|---|---|---|
| C95400 (9C Aluminum Bronze) |
CuAl10Fe3 (CC331G / G-CuAl10Fe) |
Cu ≥83%, Al 10.0–11.5%, Fe 3.0–5.0%, Ni ≤1.5% | 515 MPa / 205 MPa (HT C95400: 620 / 310 MPa) |
≥12% 150–190 HB |
High-load wear plates,landing gear bushings, pickling hooks, valve stems, worm gears |
| C95800 (Nickel-Aluminum Bronze / NAB) |
CuAl10Fe5Ni5-C (CC333G) |
Cu ≥79%, Al 8.5–9.5%, Ni 4.0–5.0%, Fe 3.5–4.5%, Mn 0.8–1.5% | 585 MPa / 240 MPa | ≥15% 150–180 HB |
Seawater pump impellers, subsea valve bodies, desalination hardware, marine propellers |
| C83600 (85-5-5-5 Leaded Red Brass / Gunmetal) |
CuSn5Zn5Pb5-C (CC491K / RG5) |
Cu 84–86%, Sn 4.0–6.0%, Pb 4.0–6.0%, Zn 4.0–6.0% | 205 MPa / 95 MPa | ≥15% 60–75 HB |
Pressure-tight water & steam valve bodies, meter housings, pipe fittings, low-pressure impellers |
| C93200 (SAE 660) (High-Leaded Tin Bronze) |
CuSn7Zn4Pb7-C (CC493K / RG7) |
Cu 81–85%, Sn 6.3–7.5%, Pb 6.0–8.0%, Zn 1.0–4.0% | 240 MPa / 125 MPa | ≥10% 65–80 HB |
Heavy-machinery journal bearings, thrust washers, spindle bushings, hydraulic wear rings |
2. Foundry Metallurgy: Why Aluminum Bronze Castings Require Bottom-Gated Non-Turbulent Pouring
Unlike leaded tin bronzes (C83600 and C93200), which have a wide freezing range and rely on dispersed lead globules to seal microporosity, C95400 and C95800 aluminum bronzes have a narrow freezing range (~15 °C) and rapidly form a tough, refractory Al2O3 oxide skin on the molten stream. If poured turbulently, folded oxide bifilms become entrained inside the casting wall and cause leakage under hydrostatic testing.
- Gating & Filtration at YCUMETAL: When casting C95400 and C95800 via resin sand, silica-sol investment casting, or permanent mold gravity casting, we use tranquil bottom-gating with ceramic foam filters and generous insulated risers to ensure directional solidification.
- Dealuminification Resistance (Ni ≥ Fe Rule in C95800): In marine and brackish water applications, C95800 requires Ni wt.% ≥ Fe wt.% plus a 675 °C temper anneal for 6 hours (air cooled) to transform continuous γ2 phase into corrosion-resistant κ phases.
- Precision CNC Machining: Leaded bronzes (C83600/C93200) have an 80–100% free-machining rating, whereas work-hardening C95400/C95800 (20–30% machinability rating) demands positive-rake carbide tooling and high-pressure flood coolant on our CNC turning and 4-axis milling centers.
3. Request a Custom Bronze or Copper Casting Quote
Whether you need precision silica-sol cast copper nozzles, C95800 seawater impellers, or CNC-turned C95400/C93200 bushings, YCUMETAL supplies complete chemical/mechanical certification (EN 10204 3.1) from our 34,000 m² Pingdu plant. See our international casting grade cross-reference chart or submit your drawings for a 24-hour engineering review.
Frequently Asked Questions (Engineering FAQ)
When should I specify C95800 instead of C95400 aluminum bronze?
Specify C95800 (Nickel-Aluminum Bronze with 4–5% Ni) whenever the casting operates in seawater, brackish water, or high-velocity cavitation environments (such as marine propellers, seawater valves, and desalination pumps). C95400 lacks high nickel additions and is best suited for heavy mechanical wear, sliding bearings, and non-marine structural bushings.
Is C83600 lead-free for potable water applications?
No. C83600 contains 4% to 6% lead for pressure tightness and machinability. For lead-free potable water regulations (such as NSF/ANSI 61 and 372), bismuth-modified EnviroBrass grades like C89833 or silicon bronzes like C87600 should be specified instead.
Which casting process is best for C95400 and C83600 components?
Small, complex bronze valves and nozzles (0.05 kg to 25 kg) achieve tightest tolerances and smoothness via silica-sol lost-wax investment casting or gravity permanent mold casting, while larger pump casings, bearings, and marine castings are poured via resin sand casting followed by precision CNC turning and milling.
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