Литьё из Бронзы Ганметаль LG2 & CDA 836 – Литейное Производство в Индии
Conex Casting is a leading manufacturer and exporter of LG2 Gunmetal Bronze Castings and CDA 836 Bronze Castings from our state-of-the-art sand casting foundry in Jamnagar, India. LG2 Gunmetal (also known as CDA 836 or C83600 in the ASTM/UNS system) is one of the most widely specified and trusted copper alloys in the world, prized for its outstanding corrosion resistance, machinability, pressure tightness, and versatility across marine, industrial, and engineering applications. We supply precision LG2 gunmetal castings to clients in the UK, USA, Europe, Australia, and across global markets — delivering consistent quality, competitive pricing, and fast lead times.
Что такое LG2 Ганметаль? Обзор сплава CDA 836 / C83600
LG2 Gunmetal is a leaded gunmetal alloy standardised under British Standard BS 1400 LG2. It is chemically equivalent to CDA 836 (C83600) under the American ASTM/UNS classification system. Often referred to as «85-5-5-5 bronze,» LG2 Gunmetal consists of approximately 85% copper, 5% tin, 5% lead, and 5% zinc — a composition that has been trusted in engineering since the age of steam.
Its combination of excellent castability, pressure tightness, low-friction bearing properties, and resistance to seawater, steam, and a wide range of chemicals makes LG2 Gunmetal the go-to alloy for valve bodies, pump housings, marine fittings, hydraulic components, and precision bearing housings. At Conex Casting, we cast LG2 Gunmetal parts weighing from 30 grams to over 10 kg using green sand and black sand casting processes.
Химический состав Ганметаль LG2 / CDA 836
| Element | LG2 (BS 1400) | CDA 836 / C83600 (ASTM) |
|---|---|---|
| Copper (Cu) | 84–86% | 84–86% |
| Tin (Sn) | 4–6% | 4–6% |
| Lead (Pb) | 4–6% | 4–6% |
| Zinc (Zn) | 4–6% | 4–6% |
| Nickel (Ni) | max 2% | max 1% |
| Iron (Fe) | max 0.25% | max 0.30% |
| Antimony (Sb) | max 0.25% | max 0.25% |
Механические Свойства Ганметаль LG2 / CDA 836
| Property | Value |
|---|---|
| Tensile Strength | 240 MPa (35,000 psi) min |
| Yield Strength (0.2% offset) | 120 MPa (17,000 psi) |
| Elongation | 18% min |
| Brinell Hardness (HB) | 60–70 HB |
| Density | 8.83 g/cm³ |
| Melting Range | 853–1000°C (1567–1832°F) |
| Machinability Rating | 84% (relative to free-cutting brass = 100%) |
Основные Свойства и Преимущества Литья из Бронзы Ганметаль LG2
- Outstanding Corrosion Resistance: LG2 Gunmetal exhibits excellent resistance to seawater, steam, potable water, brine, and a wide range of dilute acids and alkalis, making it ideal for marine and fluid-handling applications.
- Pressure Tightness: The leaded composition of CDA 836 promotes excellent pressure tightness, essential for valve bodies, pump housings, and hydraulic components operating under pressure.
- Superior Machinability: With a machinability rating of approximately 84%, LG2 Gunmetal machines cleanly and efficiently, reducing post-casting machining time and cost.
- Excellent Castability: LG2 flows freely in sand molds, faithfully reproducing complex geometries, thin walls, and intricate internal passages.
- Good Bearing Properties: The lead content provides inherent lubricity, making LG2 castings suitable for bushings, bearings, and wear pads operating under moderate loads.
- Dezincification Resistance: The low zinc content and balanced alloy composition make LG2 castings inherently resistant to dezincification, an important advantage over brass in potable water systems.
- Good Weldability and Brazeability: LG2 Gunmetal can be welded and brazed using standard copper alloy techniques when required.
- Wide Temperature Range: Suitable for continuous service from cryogenic temperatures up to approximately 260°C (500°F).
Типичное Применение Отливок из Ганметаль LG2 / CDA 836
LG2 Gunmetal castings are used extensively across a broad range of industries worldwide. The following are the most common application sectors served by Conex Casting:
Marine and Offshore
LG2 Gunmetal is a preferred alloy for seawater-wetted components due to its excellent resistance to saltwater corrosion. Typical marine applications include seacock bodies, through-hull fittings (thru hulls), strainers, sea strainer housings, propeller shaft brackets, stern tube bearings, rudder bearings, water inlet valves, bilge pump housings, and deck hardware.
Valves and Fluid Control
Gate valves, globe valves, ball valves, check valves, safety relief valves, pressure reducing valves, and all associated valve bodies, bonnets, and trim components are routinely manufactured in LG2 / CDA 836. The alloy meets the requirements of BS 5154, BS 5163, ASME B16.24, and other valve standards for water, steam, gas, and chemical service.
Pumps and Hydraulics
Pump casings, impellers, diffusers, stuffing box covers, bearing housings, hydraulic valve bodies, manifold blocks, and cylinder end caps are commonly produced in LG2 Gunmetal for water supply, fire-fighting, process, and hydraulic systems.
Plumbing and Water Fittings
LG2 / CDA 836 is widely used for potable water pipe fittings, tee pieces, elbows, couplings, flanges, unions, hose connectors, backflow prevention valves, meter bodies, and inline strainers in building services, commercial plumbing, and infrastructure projects.
Industrial Bearings and Bushings
The natural lubricity of LG2 Gunmetal makes it suitable for plain journal bearings, flanged bushings, thrust washers, wear pads, and bearing housings in general engineering, mining equipment, textile machinery, and agricultural machinery.
Electrical and Switchgear
LG2 Gunmetal is used for electrical connectors, transformer lugs, earth clamps, ground rod clamps, hotline clamps, conductor splices, busbar fittings, and switchgear components where corrosion resistance and electrical conductivity are both required.
Defence and Heritage
Historically, gunmetal was the material of choice for cannon and ordnance — hence the name. Today, LG2 castings continue to serve defence applications including naval fittings, weapon components, and heritage restoration projects.
Детали, Изготавливаемые из Ганметаль LG2 / CDA 836 на Conex Casting
Our foundry regularly produces the following cast parts in LG2 Gunmetal bronze:
- Gate valve bodies, bonnets, and handwheels
- Globe valve bodies and trim components
- Ball valve bodies and end caps
- Check valve bodies and covers
- Pump casings and impellers
- Stuffing box housings and gland covers
- Pipe flanges and flange adaptors
- Threaded pipe fittings (elbows, tees, couplings, reducers)
- Through-hull fittings (thru hulls) and sea cocks
- Marine strainer bodies and covers
- Propeller shaft stern tube liners and bearings
- Plain journal bearings and flanged bushings
- Thrust washers and wear pads
- Hydraulic manifold blocks and cylinder end caps
- Electrical earth clamps and hotline clamps
- Ground rod clamps and conductor fittings
- Meter bodies and inline strainer housings
- Backflow preventer bodies
- Architectural hardware and marine deck fittings
- Gearbox housings and end covers
Процесс Песчаного Литья Ганметаль LG2 на Conex Casting
Our proven sand casting process for LG2 Gunmetal / CDA 836 ensures dimensional accuracy, sound metallurgy, and consistent mechanical properties across every production run:
- Pattern Design and Manufacturing: Patterns are produced in wood, aluminium, or epoxy resin from customer drawings (2D/3D CAD, PDF, or sample). Draft angles and machining allowances are incorporated at the design stage.
- Mold Preparation: Green sand or black sand molds are prepared using high-quality silica sand blended with bentonite clay and additives for superior mold strength and surface finish.
- Core Making: Sand cores are produced for internal passages, ports, and hollow sections using cold-box or CO₂ core-making processes.
- Alloy Melting: LG2 Gunmetal ingots — sourced and manufactured in-house — are melted in induction furnaces under controlled conditions. Melt temperature is maintained between 1,050°C and 1,150°C. Chemical composition is verified by spectrometric analysis before pouring.
- Pouring: Molten LG2 Gunmetal is poured into prepared sand molds through engineered gating and riser systems that control metal flow, minimise turbulence, and prevent shrinkage defects.
- Cooling and Shake-Out: Castings are allowed to cool naturally. Molds are broken out and sand is reclaimed and recycled.
- Fettling and Cleaning: Gates, risers, and fins are removed. Castings are shot-blasted to a clean, uniform surface.
- Inspection and Testing: Dimensional inspection using vernier, CMM, or gauges. Visual inspection. Pressure testing (hydraulic or pneumatic) upon request. Chemical analysis certificates available.
- Machining (Optional): CNC turning, milling, drilling, tapping, and grinding available in-house on machined-to-print components.
- Packing and Export: Castings are packed in export-grade packaging and shipped worldwide via air freight, sea freight, or courier.
Варианты Отделки Поверхности для Отливок LG2 / CDA 836
Conex Casting offers a comprehensive range of surface finish and post-casting treatment options for LG2 Gunmetal castings:
- As-Cast (Shot Blasted): Standard finish after fettling and shot blasting. Surface roughness typically Ra 6.3–12.5 µm. Suitable for most industrial and sub-surface applications.
- Machined Finish: CNC-machined surfaces to customer-specified tolerances (IT7–IT9 typical). Mating faces, bores, threads, and ports can be fully machined to print. Typical machined surface finish Ra 1.6–3.2 µm.
- Vibratory Deburring / Linishing: Edge deburring and light surface smoothing for improved aesthetics and safe handling of fittings and hardware components.
- Polished Finish: Mechanical polishing (linish/buff) to achieve a bright, specular finish for architectural, decorative, and high-visibility applications. Typical finish Ra 0.4–0.8 µm.
- Barrel Polishing: Batch tumble-polishing to achieve a uniform satin or semi-bright finish on smaller fittings and hardware items.
- Electroplating: Nickel, chrome, tin, or silver electroplating available for enhanced corrosion resistance, electrical conductivity, or decorative appearance.
- Powder Coating: Epoxy or polyester powder coating for additional corrosion protection and colour coding of valve and pipework components.
- Chemical Patination / Antiquing: Traditional brown or black patination treatments available for heritage restoration, architectural, and decorative castings.
- Pressure Testing: Hydraulic pressure testing to specified test pressures (typically 1.5× working pressure) for valve bodies and pressure-containing parts.
Стандарты Качества и Сертификации
Conex Casting’s LG2 Gunmetal / CDA 836 castings conform to the following internationally recognised standards and specifications:
- BS 1400 LG2 (UK / British Standard)
- ASTM B584 C83600 (USA)
- EN 1982 CC491K (European Standard)
- BS EN 1982 (UK adoption of EN 1982)
- DIN 1709 GRG7 (Germany)
- AS 1565 C83600 (Australia)
- ISO 1338 (International)
Material test certificates (MTCs) with chemical analysis and mechanical properties are available with every order. Third-party inspection (SGS, Bureau Veritas, TÜV) can be arranged upon request.
Почему Выбрать Conex Casting для Отливок LG2 / CDA 836?
- In-House Ingot Manufacturing: We produce our own LG2 Gunmetal ingots, ensuring consistent alloy composition and enabling highly competitive pricing.
- 30+ Years of Experience: Decades of specialised expertise in non-ferrous sand casting including LG2 Gunmetal, aluminium bronze, tin bronze, and brass alloys.
- Small to Medium Production Runs: Economical production from prototypes (1–10 pieces) through to medium-volume runs of several thousand pieces per month.
- Wide Weight Range: Castings from 30 grams to 10 kg routinely produced; heavier castings available on enquiry.
- Full Machining Capability: Complete machined-to-print service in-house — one supplier, one invoice, zero coordination complexity.
- Fast Lead Times: Standard lead time 3–6 weeks from approved drawing. Expedited production available for urgent requirements.
- Global Export Experience: Exporting LG2 Gunmetal castings to the UK, USA, Europe, Australia, UAE, and globally for over two decades.
- ISO-Aligned Quality System: Documented quality procedures, incoming material inspection, in-process controls, and final inspection with full traceability.
- Responsive Sales Team: Detailed quotations typically returned within 24 hours of receiving drawings or samples.
Часто Задаваемые Вопросы — Литьё Бронзы Ганметаль LG2 & CDA 836
Q1: What is LG2 Gunmetal, and how does it differ from standard bronze?
LG2 Gunmetal (BS 1400 LG2) is a leaded gunmetal alloy containing approximately 85% copper, 5% tin, 5% lead, and 5% zinc. Unlike traditional tin bronze (which contains only copper and tin), LG2 includes zinc for improved castability and lead for enhanced machinability and bearing properties. The term «gunmetal» derives from its historical use in bronze cannons. LG2 is chemically equivalent to CDA 836 / C83600 in the ASTM/UNS system.
Q2: What is the difference between LG2 and LG4 Gunmetal?
LG4 (BS 1400 LG4) contains a higher lead content than LG2 — typically around 7% lead compared to 5% in LG2. The higher lead content of LG4 gives it superior machinability and even better bearing properties but slightly lower strength and pressure tightness. LG2 is the more widely used alloy for pressure-containing applications such as valves and pumps, while LG4 is preferred for plain bearings and bushings where maximum machinability is needed.
Q3: Is LG2 Gunmetal the same as CDA 836 or C83600?
Yes. LG2 Gunmetal (BS 1400), CDA 836, C83600 (ASTM B584), and CC491K (EN 1982) are all designations for essentially the same 85-5-5-5 copper-tin-lead-zinc alloy. The designation differs by country and standards body but the chemical composition and mechanical properties are virtually identical, making LG2 and CDA 836 directly interchangeable in most engineering applications.
Q4: What pressure rating is achievable with LG2 Gunmetal valve castings?
LG2 Gunmetal valve castings are routinely rated to PN16 (16 bar / 232 psi) for water service at ambient temperature and PN10 for steam service, in accordance with BS 5154 and related valve standards. Higher pressure ratings may be achievable depending on wall thickness and service conditions — please provide your specific requirements when enquiring, and our engineering team will advise on suitability.
Q5: Can LG2 Gunmetal castings be used in seawater and marine environments?
Yes — LG2 Gunmetal is one of the most widely used alloys for seawater-wetted components. Its excellent resistance to general corrosion, crevice corrosion, and biofouling in seawater makes it ideal for through-hull fittings, sea cocks, strainer bodies, propeller shaft bearings, stern tube liners, pump casings, and all marine hardware in direct contact with seawater or marine atmospheres.
Q6: What is the minimum and maximum casting weight you can produce in LG2 Gunmetal?
Conex Casting routinely produces LG2 Gunmetal sand castings from 30 grams (e.g., small fittings, clamps, and bushings) up to approximately 10 kilograms (e.g., large valve bodies, pump casings, and bearing housings) per individual casting. For requirements outside this range, please contact us to discuss feasibility, as heavier castings may be possible on a case-by-case basis.
Q7: What standards do your LG2 / CDA 836 castings conform to?
Our LG2 Gunmetal castings conform to BS 1400 LG2 (UK), ASTM B584 C83600 (USA), EN 1982 CC491K (Europe), and equivalent international standards including DIN 1709 GRG7 and AS 1565. Material test certificates showing chemical analysis and mechanical properties are available for all orders. Third-party inspection by SGS, Bureau Veritas, TÜV, or Lloyd’s Register can be arranged at the customer’s request.
Q8: Can you supply fully machined LG2 Gunmetal castings?
Yes. Conex Casting operates an in-house CNC machining facility capable of delivering fully machined LG2 Gunmetal components to customer-specified tolerances. Our machining services include CNC turning, milling, drilling, tapping, reaming, and grinding. We can supply components completely machined to drawing, including threaded ports, bored seats, flanged faces, and pressure-tested assemblies — eliminating the need for a separate machining supplier.
Q9: What surface finishes are available for LG2 Gunmetal castings?
We offer a broad range of finishes including as-cast shot-blasted, CNC-machined surfaces, vibratory deburring, mechanical polishing (satin and bright), barrel polishing for small parts, nickel or chrome electroplating, powder coating, and chemical patination for decorative and heritage applications. Please specify your required finish when requesting a quotation, and we will advise on feasibility and lead time.
Q10: What information do I need to provide to get a quotation for LG2 Gunmetal castings?
To prepare an accurate quotation, please provide: (1) Engineering drawing or 3D CAD file (STEP, IGES, DWG, or PDF format); (2) Alloy specification (LG2, CDA 836, C83600, or equivalent); (3) Annual or order quantity; (4) Required finish (as-cast, machined, plated, etc.); (5) Applicable standards or customer specifications; (6) Any pressure test or certification requirements. If you have a sample casting without a drawing, we can work from the sample — please contact us to discuss.
Q11: What is the typical lead time for LG2 Gunmetal sand castings?
For new tooling (new patterns), lead time is typically 3–5 weeks from receipt of approved drawings. For repeat orders using existing tooling, standard lead time is 3–4 weeks. Expedited production is available for urgent requirements — please contact our sales team to discuss. We ship globally via sea freight (for larger consignments) and air freight or courier (for samples and smaller urgent orders).
Q12: Do you accept small or sample orders for LG2 Gunmetal castings?
Yes. We regularly supply prototype samples (1–5 pieces) for customer evaluation and approval. Sample castings are produced from newly made patterns and are metallurgically identical to production castings. Once samples are approved, production orders of any size can follow. Minimum order quantities for repeat production are typically 50–100 kg of finished castings, though we are happy to discuss smaller requirements for specialised or heritage applications.
Запросите Коммерческое Предложение на Отливки LG2 / CDA 836 Сегодня
Conex Casting is ready to support your LG2 Gunmetal or CDA 836 Bronze Casting requirements — from single prototype samples to high-volume export orders. Our experienced foundry team will review your drawings, advise on alloy selection, suggest casting and machining solutions, and provide a competitive, fully detailed quotation within 24 hours.
Send us your drawings, specifications, or samples today and discover why leading manufacturers, engineering companies, and procurement teams across the UK, USA, Europe, and Australia trust Conex Casting for precision LG2 Gunmetal and CDA 836 Bronze Castings.
📧 Email: sales@conex-casting.com
📞 Phone: +91-22 43449300 / 23
🕐 Office Hours: IST 10:00 AM – 7:00 PM (Monday to Saturday)