UNS C63200 Nickel Aluminum Bronze
Composition, mechanical and physical properties, international equivalents, heat treatment, and the forged product forms we manufacture to ASTM B150, ASTM B171 / ASME SB-171, ASTM B124 and ASTM B283.
UNS C63200 at a glance
- Alloy family
- Wrought nickel aluminum bronze (NAB), copper-base
- Nominal composition
- Cu bal. / Al 9% / Fe 4% / Ni 4.4% / Mn 1.6%
- Governing standards
- ASTM B150 (rod, bar, shapes), ASTM B171 and ASME SB-171 (plate and tube sheet), ASTM B124 (forging stock), ASTM B283 (die forgings), MIL-B-24059, QQ-C-465
- Tensile strength, min
- 620 MPa (90 ksi)
- Yield strength, min
- 205 to 345 MPa (30 to 50 ksi), depending on form and section size
- Elongation, min
- 10% for plate, 15% for rod, bar and shapes
- Density
- 7.64 g/cm³ (0.276 lb/in³)
- Nearest equivalents
- BS 2874 CA104, BS EN 12163 CW307G, ISO CuAl10Ni5Fe4, DIN/WL 2.0966, DTD 197A, GB/T QAl10-4-4
- Main strengths
- Seawater corrosion, cavitation and erosion resistance, non-sparking, effectively non-magnetic, holds toughness below 0 °C
- Typical uses
- Heat-exchanger and condenser tube sheets, pump casings and impellers, valve trim, propeller shafts, marine fasteners, weapons-handling hardware
- Supplied by
- Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory in Jiangyin, Jiangsu, China
What is UNS C63200?
UNS C63200 is a wrought nickel aluminum bronze (NAB) containing nominally 9% aluminum, 4% iron, 4.4% nickel and 1.6% manganese, with copper as the balance. It is specified in ASTM B150 for rod, bar and shapes, in ASTM B171 and ASME SB-171 for plate used in pressure vessels, condensers and heat exchangers, and in ASTM B124 and ASTM B283 for forgings. The alloy combines a minimum tensile strength of 620 MPa (90 ksi) with high resistance to seawater corrosion, cavitation and erosion, and it is non-sparking and effectively non-magnetic. Those properties make it the usual choice for naval and offshore tube sheets, pump and valve internals, and high-strength marine fasteners.
The behaviour comes from a duplex microstructure. Aluminum forms a tough, self-repairing alumina-rich surface film that survives flow velocities which would erode copper-nickel or brass. Nickel stabilises the structure and suppresses the brittle, corrosion-prone beta phase. Iron refines the grain and adds strength through kappa-phase precipitation. Both ASTM B150 and ASTM B171 therefore carry a hard rule: the iron content must not exceed the nickel content. Once the iron-to-nickel balance slips, the alloy becomes open to selective-phase de-aluminification in seawater, which is the most common failure mode for badly specified NAB.
C63200 is sometimes called an American naval bronze, since it was developed to US Navy requirements (MIL-B-24059, QQ-C-465). Its tighter aluminum window and the mandatory Fe ≤ Ni rule separate it from the higher-strength but less corrosion-stable C63000.
Chemical composition of UNS C63200
Per ASTM B150/B150M and ASTM B171/B171M, UNS C63200 is specified as aluminum 8.7 to 9.5%, iron 3.5 to 4.3%, nickel including cobalt 4.0 to 4.8%, manganese 1.2 to 2.0%, silicon 0.10% maximum, lead 0.02% maximum, and copper as the remainder. Both standards also require that the iron content does not exceed the nickel content.
| Element | Minimum | Maximum | Function in the alloy |
|---|---|---|---|
| Copper (Cu), incl. silver | - | Remainder | Matrix, biofouling resistance |
| Aluminum (Al) | 8.70 | 9.50 | Forms the self-repairing oxide film, principal strengthener |
| Iron (Fe) A | 3.50 | 4.30 | Grain refinement, kappa-phase strengthening |
| Nickel (Ni), incl. cobalt A | 4.00 | 4.80 | Suppresses beta phase, stabilises corrosion resistance |
| Manganese (Mn) | 1.20 | 2.00 | Deoxidiser, improves hot workability and weldability |
| Silicon (Si) | - | 0.10 | Residual, restricted to protect ductility |
| Lead (Pb) | - | 0.02 | Residual, restricted to protect weldability |
A Mandatory note: iron content shall not exceed nickel content (ASTM B150 Table 1, Note A; ASTM B171 Table 1, Note D). Where the product is intended for subsequent welding and the purchaser so specifies, ASTM B150 also limits chromium, cadmium, zirconium and zinc to 0.05% max each.
Mechanical properties of UNS C63200
The minimum mechanical properties of UNS C63200 depend on product form, temper and section size. Across all covered forms the minimum tensile strength is 620 MPa (90 ksi). Minimum yield strength at 0.5% extension under load runs from 205 MPa (30 ksi) for the heaviest plate to 345 MPa (50 ksi) for bar up to 80 mm, and minimum elongation is 10% for plate and 15% for rod, bar and shapes.
Plate and tube sheet, ASTM B171 and ASME SB-171
| Thickness | Tensile strength, min | Yield strength, min (0.5% ext.) | Yield strength, min (0.2% offset) | Elongation in 50 mm, min |
|---|---|---|---|---|
| Up to 50.0 mm (2 in.) | 620 MPa / 90 ksi | 250 MPa / 36 ksi | 235 MPa / 34 ksi | 10% |
| Over 50.0 to 100.0 mm (2 to 3.5 in.) | 585 MPa / 85 ksi | 230 MPa / 33 ksi | 215 MPa / 31 ksi | 10% |
| Over 100.0 to 140.0 mm (3.5 to 5 in.) | 550 MPa / 80 ksi | 205 MPa / 30 ksi | 195 MPa / 28 ksi | 10% |
Source: ASTM B171/B171M, Table 3. Yield strength is determined as the stress producing 0.5% extension under load (0.254 mm in a 50 mm gauge length). For ASME Boiler and Pressure Vessel Code work, material must be certified in the hot rolled and annealed (O25) temper.
Rod, bar and shapes, ASTM B150
| Temper | Size | Tensile strength, min | Yield strength, min (0.5% ext.) | Elongation, min |
|---|---|---|---|---|
| TQ50 / TQ55quench hardened and temper annealed; TQ55 also drawn and stress relieved | Up to 80 mm (3 in.) | 620 MPa / 90 ksi | 345 MPa / 50 ksi | 15% |
| Over 80 to 125 mm (3 to 5 in.) | 620 MPa / 90 ksi | 310 MPa / 45 ksi | 15% | |
| Over 125 to 300 mm (5 to 12 in.) | 620 MPa / 90 ksi | 275 MPa / 40 ksi | 15% | |
| Shapes, all sizes | 620 MPa / 90 ksi | 275 MPa / 40 ksi | 15% | |
| O20 / O25hot forged and annealed / hot rolled and annealed | Bar and shapes, all sizes | 620 MPa / 90 ksi | 275 MPa / 40 ksi | 15% |
Source: ASTM B150/B150M, Table 4. Elongation is measured over four times the diameter or thickness of the specimen. For dimensions above 2.5 mm, values are based on 5.65 √A with a minimum 25 mm gauge length.
Typical delivered values for TQ50 bar
| Section size | Tensile strength | 0.5% yield strength | Elongation | Hardness |
|---|---|---|---|---|
| Up to 76 mm (3 in.) | 648 to 792 MPa 94 to 115 ksi | 345 to 496 MPa 50 to 72 ksi | 15 to 25% | 190 to 230 HB |
| 76 to 127 mm (3 to 5 in.) | 648 to 792 MPa 94 to 115 ksi | 310 to 400 MPa 45 to 58 ksi | 15 to 30% | 190 to 230 HB |
| 127 to 305 mm (5 to 12 in.) | 634 to 751 MPa 92 to 109 ksi | 276 to 379 MPa 40 to 55 ksi | 15 to 25% | 180 to 210 HB |
Typical industry delivery ranges for quench-hardened and temper-annealed bar. These are indicative values for design comparison, not specification requirements. Use Tables 2 and 3 as acceptance criteria and request a mill certificate for the actual heat.
Other typical mechanical values
| Property | Metric | Imperial |
|---|---|---|
| Hardness, Rockwell B | 92 to 97 | 92 to 97 |
| Compressive strength | 760 MPa | 110,000 psi |
| Charpy V-notch impact, -29 to 20 °C | 23 to 27 J | 17.0 to 19.9 ft-lb |
| Izod impact, -29 to 20 °C | 13 to 16 J | 9.6 to 11.8 ft-lb |
Typical published values for the alloy. Impact properties are not required by ASTM B150 or B171 and are tested only when the purchase order calls for them.
Physical properties of UNS C63200
UNS C63200 has a density of 7.64 g/cm³ (0.276 lb/in³), a liquidus of approximately 1046 °C (1915 °F), an elastic modulus of about 117 GPa (17,000 ksi) and an electrical conductivity near 7% IACS. Thermal conductivity of roughly 36 W/(m·K) is far below that of pure copper, which is a design point when the alloy is used for heat-exchanger tube sheets.
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.64 g/cm³ | 0.276 lb/in³ |
| Melting point (liquidus) | 1046 °C | 1915 °F |
| Modulus of elasticity, tension | 117 GPa | 17,000 ksi |
| Modulus of rigidity, shear | 44 GPa | 6,400 ksi |
| Poisson's ratio | 0.34 | 0.34 |
| Electrical conductivity | 7% IACS | 7% IACS |
| Electrical resistivity | 24.6 µΩ·cm | 148 Ω·circ mil/ft |
| Thermal conductivity | 36 W/(m·K) | 21 Btu·ft/(ft²·h·°F) |
| Coefficient of thermal expansion, 20 to 300 °C | 16.2 × 10⁻⁶ /K | 9.0 × 10⁻⁶ /°F |
| Specific heat capacity | 375 J/(kg·K) | 0.09 Btu/(lb·°F) |
| Relative magnetic permeability | below 1.05 | below 1.05 |
| Machinability rating | 30 | 30 |
Typical values compiled from published copper-alloy reference data. Machinability is rated against free-cutting brass C36000 = 100. Physical properties are not specification requirements under ASTM B150 or B171. For design-critical work, request measured values for the specific heat and condition.
Standards and specifications covering C63200
UNS C63200 is covered by four principal ASTM specifications: B150 for rod, bar and shapes, B171 for plate and sheet used in pressure vessels, condensers and heat exchangers, B124 for forging rod, bar and shapes, and B283 for hot-pressed die forgings. ASME SB-171 covers code work, and the US defence specifications MIL-B-24059 and QQ-C-465 apply to naval and government procurement.
| Specification | Scope | Applies to |
|---|---|---|
| ASTM B150 / B150M | Aluminum Bronze Rod, Bar, and Shapes | Round bar, hex bar, flats, shapes, forging stock |
| ASTM B171 / B171M | Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers, and Heat Exchangers | Tube sheets, tube plates, baffles, support plates, circles |
| ASME SB-171 | BPVC Section II Part B adoption of ASTM B171 | Code-stamped pressure vessels and heat exchangers |
| ASTM B124 / B124M | Copper and Copper Alloy Forging Rod, Bar, and Shapes | Open-die forging feedstock |
| ASTM B283 / B283M | Copper and Copper-Alloy Die Forgings (Hot-Pressed) | Closed-die forgings |
| MIL-B-24059 | US military specification, nickel aluminum bronze bar and forgings | Naval shipbuilding |
| QQ-C-465 | US federal specification, copper-aluminum alloy forgings | Government and defence procurement |
| DEF STAN 02-833 (NES 833) | UK MoD nickel aluminum bronze, near equivalent | Royal Navy hardware |
UNS C63200 equivalent grades
The closest international equivalents to UNS C63200 are BS 2874 CA104, BS EN 12163 CW307G, ISO CuAl10Ni5Fe4, DIN/WL material number 2.0966 and Chinese GB/T QAl10-4-4. These are near equivalents rather than exact substitutes. The European and ISO grades permit aluminum up to about 11% and wider iron and nickel bands than the 8.7 to 9.5% Al and Fe ≤ Ni limits that ASTM applies to C63200.
| Country or body | Standard | Designation | Closeness |
|---|---|---|---|
| USA | ASTM / UNS | C63200 | Reference grade |
| UK | BS 2874, BS B23, BS 2B23 | CA104 | Near equivalent |
| Europe | BS EN 12163, EN 12420 | CW307G (CuAl10Ni5Fe4) | Near equivalent |
| International | ISO 428 | CuAl10Ni5Fe4 | Near equivalent |
| Germany | DIN 17665 / WL | 2.0966 | Near equivalent |
| UK aerospace | DTD 197A | DTD 197A | Near equivalent |
| China | GB/T 4423, GB/T 1176 | QAl10-4-4; cast ZCuAl10Fe4Ni4 | Near equivalent |
| Cast counterpart | ASTM B148 | C95800 nickel aluminum bronze casting | Same family, cast form |
Heat treatment and temper designations
UNS C63200 is normally supplied in the TQ50 temper, quench hardened and temper annealed, or in an annealed temper such as O20 for hot-forged parts. The temper anneal, usually carried out in the 620 to 700 °C range with controlled cooling, transforms retained beta phase into a stable alpha plus kappa structure. Untempered beta is the constituent most open to selective-phase de-aluminification in seawater, so naval and offshore specifications almost always call for the treatment.
| Code | Name | Where used |
|---|---|---|
| TQ50 | Quench hardened and temper annealed | Standard bar and forging temper for seawater service |
| TQ55 | Quench hardened, temper annealed, drawn and stress relieved | Precision bar where straightness and higher yield are needed |
| O20 | Hot forged and annealed | Forged tube sheets, discs, rings |
| O25 | Hot rolled and annealed | Plate for ASME code work |
| M10 | As hot forged, air cooled | Non-code forgings |
| M20 | As hot rolled | Non-code plate |
Typical cycle
- Solution treatment: heat uniformly to approximately 860 to 900 °C, soak to through-thickness temperature, then water quench.
- Temper anneal: reheat to approximately 620 to 700 °C, hold for a soak time proportional to section thickness, commonly about 1 hour per 25 mm with a minimum that many naval specifications set at 6 hours, then cool in still air.
- Stress relief after machining or welding: approximately 300 to 350 °C where dimensional stability matters.
Corrosion performance in seawater and process media
C63200 resists seawater corrosion by forming a tough, self-repairing aluminum-oxide surface film that withstands flow velocities which would erode copper-nickel alloys or brass. It is not susceptible to chloride stress corrosion cracking, it resists cavitation and impingement, and its copper content gives useful resistance to macro-biofouling. The main limitation is selective-phase attack where retained beta phase is present, which correct temper annealing and the ASTM Fe ≤ Ni rule are designed to prevent.
Where it performs well
- Seawater and brackish water, including high-velocity service in pumps, valves and firewater systems.
- Chloride environments, with no ductile-to-brittle transition and no chloride SCC susceptibility, unlike austenitic stainless steels.
- Dilute non-oxidising acids, neutral salts and most organic media.
- Cavitation and impingement zones such as propellers, impellers, valve seats and orifice plates.
Where care is needed
- Stagnant, polluted or sulphide-bearing seawater. Sulphides break down the protective film, so flush or cathodically protect idle systems.
- Oxidising acids and ammonia. Nitric acid, ferric and chromic salts, and ammoniacal solutions attack the alloy.
- Galvanic couples. C63200 is cathodic to steel and aluminum and anodic to titanium and most stainless steels, so isolate the joint or size the area ratio accordingly.
- Untempered or over-aluminum material. This is the classic de-aluminification failure mode. Insist on a temper-annealed condition and a certificate showing Fe ≤ Ni.
Machining, welding and forging C63200
Machining
C63200 has a machinability rating of about 30 where free-cutting brass C36000 equals 100, so it cuts more like a tough austenitic stainless steel than like brass. Use rigid setups and sharp positive-rake carbide inserts, moderate surface speeds with generous feed rates so the tool works beneath the work-hardened layer, and flood coolant. Avoid dwelling, light finishing passes and interrupted cuts, because the alloy work hardens fast and a rubbing tool will glaze the surface.
For drilled tube sheets, gun drilling or BTA drilling with through-tool coolant gives the straightest holes and the best ligament finish. Plan for slower cycle times than carbon steel or 300-series stainless. A realistic allowance is 2 to 3 times the drilling time of an equivalent carbon-steel tube sheet.
Welding
C63200 is welded by GTAW (TIG) and GMAW (MIG) with a matching nickel aluminum bronze filler such as AWS A5.7 ERCuNiAl. The step that decides the result is removal of the aluminum oxide film: clean the joint and the surrounding 25 mm to bright metal immediately before welding, and use argon or an argon-helium mix as shielding gas.
- Preheat heavy sections to approximately 150 to 200 °C and control interpass temperature to limit beta-phase retention.
- Use stringer beads and low heat input. Excessive weaving coarsens the heat-affected zone.
- Post-weld temper annealing restores the corrosion resistance of the heat-affected zone and is commonly mandatory for seawater service.
- Oxy-acetylene welding and brazing are not recommended, since the oxide film and the aluminum content make them unreliable.
Forging
C63200 forges in the range of approximately 750 to 900 °C. The hot-working window is narrow compared with carbon steel: too cold and the material cracks, too hot and grain growth plus incipient melting of low-melting constituents degrade properties. Uniform furnace soaking and a controlled finishing temperature are what separate a sound NAB forging from a rejected one.
Open-die forging with sufficient deformation ratio closes casting porosity and produces the fine, directional grain flow that gives forged tube sheets and rings their advantage over rolled plate, particularly in thick sections where through-thickness properties matter.
UNS C63200 forged product forms we manufacture
Jiangyin Jiangnan Metal Co., Ltd. manufactures UNS C63200 nickel aluminum bronze as open-die forged tube sheets and tube plates, baffles and support plates, discs and blanks, flanges, seamless rolled rings, sleeves and bushings, hollow bars, round bars and shafts, and weld-overlay clad tube sheets, all supplied to ASTM B150, ASTM B171 and ASME SB-171, ASTM B124 and ASTM B283 with EN 10204 3.1 certification.
Tube sheets and tubesheets
Front, rear, fixed, stationary and floating tube sheets and tube plates to ASTM B171 and ASME SB-171, solid C63200 or steel backed with C63200 weld overlay.
Baffles and support plates
Drilled baffles, segmental and double-segmental, tie rods and support plates matched to the tube sheet drilling.
Forged discs and blanks
Solid discs, blanks and blind flanges forged from ASTM B124 stock, rough or finish machined.
Seamless rolled rings
Ring-rolled and open-die forged rings for pump casings, wear rings, seal rings and valve bodies.
Flanges
Weld neck, slip-on, blind and custom flanges in C63200 to ASME B16.5, B16.47 or drawing.
Sleeves, bushes and bushings
Bearing sleeves, wear bushes, thrust washers and stern-tube components in the TQ50 temper.
Round and hollow bar
Forged and machined round bar, hollow bar and shafts to ASTM B150 in TQ50, TQ55 and O20 tempers.
Cladding and weld overlay
C63200 overlay on carbon-steel or low-alloy backing for large tube sheets, with dilution-controlled procedures.
Size range
Our open-die presses and ring mills cover the range normally required for heat-exchanger and marine components. Send a drawing or a dimensional sketch and we will confirm the capability, tolerances and lead time for the part. Contact sales@steelforgepieces.com or +86-189-2135-9659.
C63200 against C63000 and C95800: which nickel aluminum bronze?
Choose C63200 for wrought parts in seawater service where corrosion stability matters most, C63000 for wrought parts where higher strength matters more than seawater performance, and C95800 where the component is a casting rather than a forging or bar. C63000 carries more aluminum (9.0 to 11.0%) and reaches higher strength, while the tighter chemistry of C63200, with aluminum capped at 9.5% and iron held below the nickel level, gives the more stable microstructure for long-term seawater exposure.
| Criterion | C63200, wrought | C63000, wrought | C95800, cast |
|---|---|---|---|
| Primary standard | ASTM B150, B171, B124, B283 | ASTM B150, B171, B124 | ASTM B148 |
| Aluminum | 8.7 to 9.5% | 9.0 to 11.0% | 8.5 to 9.5% |
| Iron | 3.5 to 4.3%, not above Ni | 2.0 to 4.0% | 3.5 to 4.5% |
| Nickel | 4.0 to 4.8% | 4.0 to 5.5% | 4.0 to 5.0% |
| Manganese | 1.2 to 2.0% | 1.5% max | 0.8 to 1.5% |
| Tensile strength, min | 620 MPa / 90 ksi | 620 to 760 MPa / 90 to 110 ksi | 585 MPa / 85 ksi |
| Seawater stability | Best of the three | Good, higher Al raises de-aluminification risk | Very good when correctly heat treated |
| Best for | Tube sheets, naval hardware, seawater pump and valve parts, fasteners | High-strength shafts, gears, bearings, aerospace bushings | Pump casings, impellers, propellers, valve bodies |
Composition limits from ASTM B150, ASTM B171 and ASTM B148. Strength figures are specification minima and vary with temper and section size.
Testing, inspection and certification
Every C63200 order is supplied with an EN 10204 3.1 mill certificate carrying full heat-number traceability. Standard testing covers spectrographic chemical analysis, tensile testing to ASTM E8/E8M, Brinell hardness, ultrasonic examination and a dimensional report. EN 10204 3.2 third-party certification by a classification society or an independent inspection agency is available on request.
- Chemical analysis. Optical emission spectrometry on each heat, reported element by element against the ASTM B150 and B171 limits, including confirmation that Fe ≤ Ni.
- Mechanical testing. Tensile to ASTM E8/E8M, with Charpy V-notch impact on request for low-temperature service.
- Hardness. Brinell survey across the face for tube sheets and discs.
- Non-destructive examination. Ultrasonic examination to a purchaser-agreed acceptance standard, liquid penetrant to ASTM E165 on machined surfaces.
- Microstructure. Metallographic examination to verify the temper-annealed alpha plus kappa structure where the specification requires it.
- PMI. Positive material identification at despatch on request.
- Third-party inspection. We work routinely with LR, DNV, BV, ABS, TUV, SGS and BINE.
Frequently asked questions about UNS C63200
What is UNS C63200?
UNS C63200 is a wrought nickel aluminum bronze (NAB) containing nominally 9% aluminum, 4% iron, 4.4% nickel and 1.6% manganese, with copper as the balance. It is specified in ASTM B150 for rod, bar and shapes, in ASTM B171 and ASME SB-171 for plate used in pressure vessels, condensers and heat exchangers, and in ASTM B124 and B283 for forgings. C63200 has a minimum tensile strength of 620 MPa (90 ksi), high resistance to seawater corrosion, cavitation and erosion, and it is non-sparking and effectively non-magnetic.
What is the chemical composition of C63200?
Per ASTM B150 and ASTM B171, UNS C63200 contains aluminum 8.7 to 9.5%, iron 3.5 to 4.3%, nickel including cobalt 4.0 to 4.8%, manganese 1.2 to 2.0%, silicon 0.10% maximum, lead 0.02% maximum, and copper as the remainder. Both standards also require that the iron content does not exceed the nickel content, since excess iron relative to nickel lowers seawater corrosion resistance.
What is the difference between C63200 and C63000?
C63000 carries more aluminum (9.0 to 11.0% against 8.7 to 9.5%) and slightly more nickel (4.0 to 5.5%), so it reaches higher strength, up to 760 MPa in high-strength tempers. C63200 uses a tighter, lower-aluminum window with iron capped below the nickel level and manganese held at 1.2 to 2.0%, which gives a more stable microstructure and better resistance to selective-phase attack in seawater. C63000 is normally chosen for high-strength mechanical parts, while C63200 is the usual grade for naval and offshore seawater service, including heat-exchanger tube sheets.
Is C63200 the same as CA104 or CW307G?
They are near equivalents, not identical grades. BS 2874 CA104, BS EN 12163 CW307G and ISO CuAl10Ni5Fe4 describe nickel aluminum bronzes in the same family and are routinely cross-referenced to C63200, but the European grades allow aluminum up to about 11% and wider iron and nickel bands. Where a purchase order calls for C63200, the material should be certified to ASTM B150, B171, B124 or B283 rather than supplied as CA104 or CW307G without written concession.
What is the minimum tensile strength of C63200 tube sheet under ASTM B171?
ASTM B171/B171M requires a minimum tensile strength of 620 MPa (90 ksi) for C63200 plate up to 50 mm (2 in.) thick, 585 MPa (85 ksi) over 50 to 100 mm, and 550 MPa (80 ksi) over 100 to 140 mm. Minimum yield strength at 0.5% extension under load is 250, 230 and 205 MPa respectively, and minimum elongation in 50 mm is 10% for all three thickness ranges.
Can C63200 be welded?
Yes. C63200 is welded by GTAW (TIG) and GMAW (MIG) with a matching nickel aluminum bronze filler such as AWS A5.7 ERCuNiAl. Clean the joint to bright metal so the aluminum oxide film is removed, preheat heavy sections to roughly 150 to 200 °C, control interpass temperature, and run stringer beads at low heat input. A post-weld temper anneal restores corrosion resistance in the heat-affected zone and is commonly required for seawater service. Oxy-acetylene welding and brazing are not recommended.
Is C63200 suitable for seawater service?
Yes. Seawater is the service C63200 was developed for. The alloy forms a self-repairing aluminum-rich oxide film that resists erosion, cavitation and impingement at high flow velocities, it is not susceptible to chloride stress corrosion cracking, and its copper content gives useful biofouling resistance. It is used for naval and offshore tube sheets, pump casings and impellers, valve components, propeller shafts and marine fasteners. Correct temper annealing matters, so that retained beta phase does not become a site for selective-phase de-aluminification.
Is C63200 magnetic?
C63200 is effectively non-magnetic, with relative magnetic permeability typically below 1.05. It is also non-sparking, so it is specified for mine-clearance and minehunter hardware, weapons-handling equipment, and tools used in explosive atmospheres in petrochemical and mining plants.
Does C63200 require heat treatment?
For seawater service, yes. C63200 is normally supplied in the TQ50 temper, quench hardened and temper annealed, or in an annealed temper such as O20 for hot-forged parts. The temper anneal, typically in the 620 to 700 °C range with controlled cooling, transforms retained beta phase into a stable alpha plus kappa structure. Untempered beta phase is the constituent most open to selective-phase corrosion in seawater, so navy and offshore specifications almost always call for the treatment. Confirm the exact cycle against the governing specification for the project.
How machinable is C63200?
C63200 has a machinability rating of about 30 on the scale where free-cutting brass C36000 equals 100, so it cuts more like a tough stainless steel than like brass. Use rigid setups, sharp positive-rake carbide inserts, moderate surface speeds with heavy feeds so the tool stays under the work-hardened layer, and flood coolant. Avoid interrupted cuts and dwelling, because the alloy work hardens quickly.
Who manufactures UNS C63200 forged tube sheets and rings?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China that manufactures UNS C63200 nickel aluminum bronze tube sheets, tubesheets, baffles, support plates, discs, flanges, seamless rolled rings, sleeves, bushings, round bar and hollow bar to ASTM B150, B171 and ASME SB-171, B124 and B283. Enquiries: +86-189-2135-9659, sales@steelforgepieces.com.
What product forms and certification can be supplied in C63200?
C63200 is available as open-die forged tube sheets and tube plates (fixed, stationary and floating), baffles and support plates, forged discs and blanks, flanges, seamless rolled rings, sleeves, bushes, hollow bars, round bars, shafts and weld-overlay clad tube sheets. Standard documentation covers an EN 10204 3.1 mill certificate with heat-number traceability, spectrographic chemical analysis, tensile testing to ASTM E8/E8M, Brinell hardness, ultrasonic examination and a dimensional report. EN 10204 3.2 third-party certification is available on request.
References and data sources
Standards referenced on this page
ASTM B150/B150M, Standard Specification for Aluminum Bronze Rod, Bar, and Shapes (Tables 1 and 4).
ASTM B171/B171M, Standard Specification for Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers, and Heat Exchangers (Tables 1 and 3).
ASTM B124/B124M, Copper and Copper Alloy Forging Rod, Bar, and Shapes.
ASTM B283/B283M, Copper and Copper-Alloy Die Forgings (Hot-Pressed).
ASME Boiler and Pressure Vessel Code, Section II Part B, SB-171.
ASTM E8/E8M for tensile testing and ASTM B601 for temper designations.
Suggested citation
Jiangyin Jiangnan Metal Co., Ltd. (2026). UNS C63200 Nickel Aluminum Bronze: Composition, Properties, Standards and Forged Product Forms. https://www.steelforgepieces.com/Alloy-Steel/UNS-C63200.html
Chemical and mechanical requirements on this page are reproduced from the ASTM specifications named above. Physical properties are typical published values for the alloy and are not specification requirements. Page last reviewed 18 September 2026.
About the manufacturer
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. We manufacture forged tube sheets, tubesheets, baffles, support plates, discs, flanges, seamless rolled rings, sleeves, bushings, hollow bars and shafts in nickel aluminum bronze, nickel alloys, stainless steel, tool steel and alloy steel, supplied worldwide against ASTM, ASME, EN and DIN specifications with EN 10204 certification.
- Company
- Jiangyin Jiangnan Metal Co., Ltd., Open-Die Forging Factory
- Address
- No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- Telephone
- +86-189-2135-9659
- sales@steelforgepieces.com
- Website
- www.steelforgepieces.com
- Grades supplied
- UNS C63200, C63000, C95800, Inconel, Incoloy, Hastelloy, Monel, Nimonic, duplex and austenitic stainless, alloy and tool steels
- Serving
- Heat exchanger and pressure-vessel fabricators, shipyards, offshore and subsea, desalination, power generation, petrochemical and defence supply chains worldwide