Bronze casting is one of the oldest and most reliable manufacturing processes in the world, and at Cable Glands India, we have mastered the full spectrum of bronze casting alloys and post-casting machining operations. We manufacture custom bronze castings, precision bronze machined castings, and finished bronze components for export to the USA, UK, Europe, Australia, and the Middle East. From sand casting and investment casting to CNC machining and surface finishing, we are your one-stop partner for all bronze casting requirements.

Bronze Casting Alloys We Work With

1. Phosphor Bronze (C51000, C52100, PB1, PB102)

Phosphor bronze (4–12% tin, 0.03–0.35% phosphorus) offers excellent spring properties, fatigue resistance, and low coefficient of friction — ideal for bearings, bushings, gears, springs, and electrical contacts. C51000 (5% Sn) and C52100 (8% Sn) are the most common grades.

2. Tin Bronze (C90300, C90500, Leaded Tin Bronze)

Tin bronze (88–90% Cu, 8–10% Sn) provides excellent bearing properties, corrosion resistance in seawater, and high strength. C90300 (“Navy G Bronze”) and C90500 (“Gun Metal”) are standard grades for marine valves, pump bodies, and bushing applications.

3. Aluminium Bronze (C95400, C95500, AB1, AB2)

Aluminium bronze (6–12% Al, ±Fe, ±Ni, ±Mn) delivers the highest strength of all bronze alloys (tensile strength up to 900 MPa), excellent corrosion and erosion resistance, and good weldability. Used for offshore valves, marine propellers, hydraulic pump components, and heavy-duty bearings.

4. Manganese Bronze (C86300, C86500, HTB1, HTB3)

High-tensile manganese bronze (55–60% Cu, 25–40% Zn, 1–4% Mn) is a high-strength, wear-resistant alloy used for bridge plates, heavy gears, worm wheels, marine shaft fittings, and heavy industrial castings.

5. Silicon Bronze (C87300, C87600)

Silicon bronze (94–96% Cu, 3–5% Si) is a lead-free, corrosion-resistant alloy with excellent castability and weldability. Used for artistic castings, marine hardware, fasteners, and plumbing fittings in NSF/ANSI 61 compliant applications.

6. Beryllium Bronze / Copper Beryllium (C17200, C17500)

The highest-strength copper alloy (1,400 MPa after precipitation hardening), beryllium bronze is used for non-sparking tools, aerospace components, precision springs, and critical electrical connectors. Manufactured to ASTM B197 and AMS 4533.

Bronze Casting Processes We Offer

• Sand Casting: For large, complex parts; lower tooling cost; suitable for medium-low volumes
• Investment Casting (Lost Wax): For intricate geometries, thin walls, and excellent surface finish (Ra 3.2–6.3)
• Centrifugal Casting: For cylinders, rings, bushings, and pipes — highest density and uniformity
• Die Casting: For high-volume, dimensionally consistent small parts
• Continuous Casting: For bronze bar, rod, tube, and plate to be machined

Machined Bronze Casting Products

Bronze Valve Bodies and Marine Fittings

Sand-cast C83600 (Leaded Red Brass / “Ounce Metal”) and C90500 (Gun Metal) valve bodies, gate valves, globe valves, and check valves for seawater, steam, and industrial fluid service — machined to ASME B16.24, MSS SP-80, and BS 5154 standards.

Bronze Bushing and Bearing Castings

Centrifugally cast C93200 (SAE 660 Bearing Bronze) and C93800 bushings for heavy machinery, agricultural equipment, construction machinery, and industrial gearboxes. Drilled and reamed to H7 tolerance.

Bronze Transformer Spades and Electrical Castings

Investment-cast and machined bronze transformer spade connectors, hotline clamps, rebar grounding clamps, and electrical bonding connectors for the power transmission and distribution industry.

Bronze Marine Hardware

Cast bronze cleats, fairleads, chocks, rope guides, boat hooks, anchor windlass components, and propeller shaft fittings manufactured to ABYC, DNV GL, and Lloyd’s Register specifications.

Aluminium Bronze Impellers and Pump Parts

Investment-cast C95400 aluminium bronze impellers, diffuser rings, pump casings, and wear rings for seawater desalination, fire pumps, offshore platform pumps, and chemical processing.

Bronze Alloy Grades – International Equivalents Table

Alloy Type	ASTM/UNS (USA)	BS (UK)	EN (Europe)	DIN (Germany)	IS (India)
Phosphor Bronze	C51000, C52100	PB1, PB102	CW451K, CW453K	2.1020, 2.1030	Grade PB1
Tin Bronze (Gun Metal)	C90300, C90500	LG2, G1	CC491K, CC493K	2.1050, 2.1052	LTB2
Aluminium Bronze	C95400, C95500	AB1, AB2	CC331G, CC333G	2.0960, 2.0966	Al-Br Grade 1
Manganese Bronze	C86300, C86500	HTB1, HTB3	CC765S, CC766S	2.0592, 2.0596	HTB Grade
Silicon Bronze	C87300, C87600	SB1	CC755S	2.1461	Si-Br Grade
Leaded Red Brass	C83600 (Ounce Metal)	LG4	CC493K	2.1090	LRB Grade
Bearing Bronze (SAE 660)	C93200	LB1	CC494K	2.1176	LB2

Why Choose Cable Glands India for Bronze Castings?

• Multi-Process Foundry: Sand casting, investment casting, centrifugal casting, and die casting capabilities under one roof.
• Full Machining: Post-casting CNC turning, milling, drilling, grinding, and tapping to finished dimensions.
• Material Expertise: 15+ active bronze alloys; metallurgical consulting for alloy selection.
• Quality Assurance: Radiographic (X-ray) testing, UT (ultrasonic) inspection, spectroscopic chemical analysis, and mechanical property testing available.
• USA Export Experience: Compliance with ASTM, ASME, MSS, AWWA, ANSI, and API standards for US market acceptance.
• Competitive Pricing: India’s foundry cost advantages — 40–60% lower than equivalent US or UK casting suppliers.

Frequently Asked Questions – Bronze Castings

Q1: What is the strongest bronze alloy for industrial use?

A: Aluminium Bronze C95500 and Manganese Bronze C86300 are the strongest bronze alloys, achieving tensile strengths of 690–900 MPa. Beryllium Copper C17200 is even stronger (up to 1,400 MPa) but is typically classified separately as a copper-beryllium alloy.

Q2: What is the best bronze alloy for marine applications?

A: C90500 (Gun Metal / Navy G Bronze) and C95400 (Aluminium Bronze) are the preferred alloys for marine applications. Gun Metal resists seawater corrosion and de-alloying. Aluminium Bronze additionally offers superior erosion resistance for propellers, impellers, and high-velocity seawater service.

Q3: Can bronze castings be welded and repaired?

A: Yes. Aluminium Bronze and Silicon Bronze have excellent weldability using TIG or MIG welding with appropriate filler rods (ERCuAl-A2 for Aluminium Bronze, ERCuSi-A for Silicon Bronze). Tin Bronze and Phosphor Bronze require more care — pre-heating and post-weld treatment recommended.

Q4: What surface finishes are available for bronze castings?

A: As-cast (Ra 6.3–12.5), shot-blasted, vibratory tumbled, electropolished, chrome-plated, nickel-plated, tin-plated, powder-coated, and lacquered finishes available. Machined surfaces achieve Ra 0.8–3.2 as standard.

Q5: What NDT (non-destructive testing) do you offer for bronze castings?

A: We offer radiographic (X-ray) testing to ASTM E272, ultrasonic testing (UT), dye penetrant inspection (DPI), pressure testing, and spectroscopic chemical analysis. NDT certificates provided with casting lots.

Q6: What is the minimum order quantity for custom bronze castings?

A: MOQ varies by casting process: Sand casting: 10–50 pieces. Investment casting: 50–200 pieces. Centrifugal casting: 25–100 pieces. Prototypes (1–5 pieces) available for design validation at higher per-unit cost.

Q7: What ASTM standards cover bronze casting alloys?

A: Key ASTM standards: B505 (Continuous Cast Bronze), B271 (Centrifugal Castings), B584 (Sand Castings for General Applications), B30 (Bronze Ingot), and B148 (Aluminium Bronze Sand Castings). We manufacture to all applicable ASTM standards.

Q8: Do you manufacture bronze castings for the oil and gas industry?

A: Yes. We manufacture aluminium bronze and nickel aluminium bronze castings for subsea valves, offshore platform equipment, and downhole tools per API 6A, NACE MR0175/ISO 15156, and ASTM B148 requirements.

Q9: What is the lead time for bronze castings from Cable Glands India?

A: Prototype / first article: 4–6 weeks. Production castings (standard alloys): 6–10 weeks. Complex machined and finished castings: 8–12 weeks. Rush production available for urgent requirements.

Q10: Do you provide material test reports for bronze castings?

A: Yes. We provide EN 10204 Type 3.1 / Type 3.2 material test reports with chemical composition (OES analysis) and mechanical properties (tensile, hardness, elongation) from NABL-accredited laboratories.

Q11: Can you reverse-engineer worn bronze castings from samples?

A: Yes. We offer reverse engineering services using 3D scanning, CMM measurement, and alloy identification by spectroscopic analysis. We replicate obsolete or worn castings from physical samples without original drawings.

Q12: What industries use bronze castings from Cable Glands India?

A: Power utilities (transformer connectors), marine (valves, propeller fittings), oil and gas (subsea valves), water treatment (pump components), defense (non-sparking tools, ordnance), electrical (grounding clamps, hotline hardware), and heavy industry (bearings, gears) across the USA, UK, and worldwide.

Q13: Is aluminium bronze the same as bronze?

A: No. Traditional bronze is primarily copper-tin. Aluminium Bronze is a copper-aluminium alloy (6–12% Al with Fe, Ni, Mn additions) that is technically classified as bronze but has significantly higher strength, better erosion resistance, and different castability compared to tin bronze.

Request a quote for bronze castings from Cable Glands India. Send your drawings, alloy specifications, or samples to sales@cableglandsindia.com.

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