Gun Metal LG2 Bronze Pipe Fittings – Elbows, Tees, Hex Nipples | Brass & Copper Parts India

Gun metal (LG2 leaded gunmetal / BS 1400 LG2) bronze pipe fittings are cast and machined fittings manufactured from leaded gunmetal alloy for high-pressure, corrosion-resistant pipe systems in marine, power generation, water treatment, oil and gas, and industrial process applications. Brass & Copper Parts India manufactures LG2 bronze elbows, tees, and hex nipples to BS 143, ASME B16.15, and MSS SP-83 standards — supplying USA EPC contractors, power utilities, naval shipbuilders, fire protection engineers, and industrial process plant operators. LG2 gunmetal (BS 1400 LG2 / ASTM B61) offers superior pressure ratings, dezincification resistance, and corrosion performance compared to brass, making it the standard alloy for critical pipe systems.

Product Overview

Gun metal LG2 bronze pipe fittings are produced by sand casting or investment casting of leaded gunmetal alloy (Cu 85%, Sn 5%, Zn 5%, Pb 5% — the “85-5-5-5” or “4-ounce alloy”), followed by machining of all sealing faces, threads, and bores on CNC equipment. The cast structure provides LG2 with superior pressure retention compared to machined brass fittings, and the tin-copper matrix is inherently resistant to seawater corrosion, steam, and high-temperature water — properties that make it a preferred material for naval and marine applications (BS 1400 LG2 / ASTM B62), power plant auxiliary piping, and fire protection systems worldwide.

Key Features

• LG2 / BS 1400 Bronze Alloy: The 85-5-5-5 (Cu-Sn-Pb-Zn) gunmetal provides higher tensile strength (230 N/mm² min), superior pressure ratings, and better corrosion resistance than standard brass fittings — particularly in seawater, steam, and hot water service.
• Full BSP, NPT, and Flanged Options: Available with BSPP (ISO 228), BSPT (ISO 7/1), and NPT (ASME B1.20.1) thread forms, as well as flanged ends to ANSI 150, BS 10 Table D/E for process piping integration.
• Pressure Rating to Class 300: LG2 cast bronze fittings are rated to Class 150 and Class 300 per ASME B16.15, and BS 143 pressure ratings — suitable for steam, compressed air, hydraulic, and water service up to the class rating.
• Dezincification Resistant: The low zinc content of LG2 (5% max) makes it inherently resistant to dezincification corrosion that affects high-zinc brass fittings in hot or chloride-rich water service.
• Wide Configuration Range: Supplied as 90° elbows (equal and reducing), 45° elbows, equal tees, reducing tees, cross fittings, hex nipples, and bushings in ½” to 4″ sizes.
• Marine and Naval Grade: LG2 bronze meets ASTM B62, BS 1400 LG2, and Lloyds Register / DNV GL material approval requirements for shipboard and offshore piping systems.

Technical Specifications

LG2 Bronze / Gunmetal International Grade Equivalents

Product Types and Variants

LG2 Bronze 90° Equal Elbows (BSP and NPT)

LG2 gunmetal 90° equal elbows are cast bronze fittings used to change the flow direction by 90° in pressurized pipe systems. Manufactured by sand casting to BS 143 / ASME B16.15 dimensional standards, with internal pipe bores and thread forms machined after casting to ensure leak-free thread engagement. Available in BSP (BSPP and BSPT) and NPT thread forms in ½” to 3″ sizes, suitable for steam, compressed air, hydraulic oil, seawater, and hot water service. These are the most widely used LG2 bronze fittings in marine, naval, and industrial process plant installations.

LG2 Bronze Equal Tees (BSP and NPT)

LG2 bronze equal tees are three-way cast bronze fittings used to branch a flow line or combine two streams into one. The casting is produced from BS 1400 LG2 / ASTM B62 alloy and all three ports are bored and threaded to identical size in equal tee configuration, or to two sizes in reducing tee configuration. LG2 bronze tees are specified in steam and condensate pipe systems, fire protection water mains, compressed air distribution, and seawater piping on naval vessels and offshore platforms. Sizes range from ½” to 3″ BSP or NPT thread.

LG2 Bronze Hex Nipples

Bronze hex nipples are short double-male-threaded fittings with a center hex for spanner tightening, used to join two female-threaded fittings or extend a pipe run. Manufactured from centrifugally cast or sand-cast LG2 bronze bar and fully CNC-machined, hex nipples are available in BSP and NPT threads from ½” to 2″. The hex section provides a positive tool grip for assembly in confined spaces. They are widely used in marine pipe systems, industrial steam tracing, hydraulic manifolds, and compressed air distribution headers.

LG2 Bronze 45° Elbows

LG2 bronze 45° elbows are cast bronze directional fittings used where a 45° change in pipe direction is required with a lower pressure drop than a 90° elbow. They are manufactured to BS 143 and ASME B16.15 dimensional standards in BSP and NPT thread forms. Common applications include marine bilge pump suction lines, hydraulic return lines, and steam condensate drain lines where a gentle change of direction reduces turbulence and erosion. Available in ½” to 2″ sizes from stock; larger sizes and reducing configurations available on order.

LG2 Bronze Reducing Elbows and Reducing Tees

Reducing LG2 bronze elbows and tees combine directional change with a size reduction in a single casting, eliminating the need for a separate reducer — reducing fitting count, weight, and potential leak points in a pipe system. Available as reducing elbows (one large port, one small port at 90°) and reducing tees (large run, reduced branch or reduced run). Common reductions include 1″ x ¾”, 1¼” x 1″, 1½” x 1″, and 2″ x 1½” in BSP and NPT threads. Custom reducing configurations are produced to customer specifications for power plant and marine OEM projects.

Applications by Industry

• Marine and Naval Shipbuilding: Sea water cooling circuits, bilge systems, deck wash piping, and auxiliary machinery pipe systems on naval vessels, commercial ships, and offshore platforms — where LG2 bronze is specified by Lloyds, DNV GL, and ABS classification societies.
• Power Generation: Auxiliary steam, condensate return, cooling water, and compressed air distribution piping in thermal power plants, nuclear auxiliary systems, and industrial co-generation plants.
• Fire Protection Systems: Wet and dry pipe sprinkler systems, fire hydrant distribution, and fire suppression manifolds where dezincification-resistant bronze fittings are required per NFPA 13.
• Oil and Gas Processing: Instrument air, cooling water, and utility fluid distribution piping in upstream and downstream oil and gas facilities requiring corrosion resistance to sour water and chlorides.
• Water Treatment and Distribution: Potable water distribution, water treatment plant piping, and pumping station piping where brass dezincification risk is present in aggressive water chemistry.
• HVAC and Building Services: High-specification steam heating, chilled water, and compressed air distribution in commercial and industrial buildings where premium-grade fittings are specified.

Manufacturing Process

LG2 bronze pipe fittings are manufactured by sand casting using chemist-controlled LG2 alloy melt with spectrographic composition verification before each pour. Pattern tooling is maintained to BS 143 and ASME B16.15 dimensional standards. After casting and shot-blasting, all pipe threads are machined on CNC lathes and inspected with calibrated BSP and NPT thread gauges. Face-to-face and center-to-face dimensions are verified against BS 143 tables. Pressure-bearing castings are hydrostatically tested at 1.5× rated working pressure as per BS 143 / ASME B16.15 test requirements. Test records, material certs, and spectrographic reports are maintained per batch for full traceability.

Quality Standards and Certifications

• ISO 9001:2015 Certified Quality Management System
• Material conformance to BS 1400 LG2 and ASTM B62 with spectrographic test reports
• Dimensional conformance to BS 143 and ASME B16.15
• Hydrostatic pressure testing at 1.5× working pressure per BS 143 / ASME B16.15
• Third-party inspection available: Lloyds Register, DNV GL, Bureau Veritas, ABS
• EN 10204 3.1 / 3.2 material test certificates available for marine and power projects

Why Choose Brass & Copper Parts India

• Classification Society Approval: We supply LG2 bronze fittings with Lloyds Register, DNV GL, and Bureau Veritas third-party inspection and material certification for marine and offshore projects.
• ASTM B62 and BS 1400 LG2 Dual Compliance: Full dual-standard capability for USA (ASTM/ASME) and UK/European (BS) markets from a single source.
• Hydrostatic Test Certificates: All pressure-rated fittings are hydrostatically tested and documented — essential for power plant, marine, and fire protection project specifications.
• Wide Size Range in Stock: ½” to 2″ standard sizes available from stock; 2½” to 4″ on 3–4 week production lead time.
• EPC Contractor Support: Bulk project supply with full documentation package (material certs, dimensional reports, test certs, packing lists) for power plant and marine EPC contractors.

Frequently Asked Questions

What is the difference between LG2 gunmetal and standard brass fittings?

LG2 gunmetal (BS 1400 LG2 / ASTM B62) contains approximately 85% copper, 5% tin, 5% lead, and 5% zinc — the “85-5-5-5” alloy. Compared to standard yellow brass (60-40 Cu-Zn), LG2 has higher tensile strength, superior resistance to dezincification, better performance in steam and seawater, and is rated for higher pressures. LG2 is the preferred alloy for naval, marine, and power generation applications where brass would be at risk of dezincification or insufficient pressure rating.

What is dezincification and why does LG2 bronze resist it?

Dezincification is a selective corrosion process where zinc is leached from brass alloys by aggressive water chemistry (soft water, chlorides, elevated temperature), leaving a porous copper-rich structure that has poor mechanical strength. LG2 gunmetal resists dezincification because its zinc content is only 5% (versus 35–40% in yellow brass), making it thermodynamically stable against selective zinc leaching.

Are LG2 bronze fittings approved by Lloyds Register and DNV GL for marine use?

LG2 bronze / ASTM B62 is an approved material under Lloyds Register Rules for Ships, DNV GL Rules, ABS Rules, and other major classification societies for seawater, steam, and fire protection piping. We can supply fittings with third-party inspection and type approval documentation on request for shipbuilding and offshore projects.

What pressure class are the LG2 bronze fittings rated to?

Our LG2 bronze threaded fittings are manufactured and tested to Class 125/150 and Class 250/300 ratings per ASME B16.15 and BS 143. Specific pressure-temperature ratings depend on fitting size and class — consult the BS 143 or ASME B16.15 tables for precise ratings at your service temperature.

Can you supply LG2 bronze fittings with NPT threads for the US market?

Yes. We produce all LG2 bronze elbow, tee, and nipple configurations with NPT threads per ASME B1.20.1 for the US market, as well as BSP threads for UK, European, Middle Eastern, and Australian markets. Dual-threaded (one end NPT, one end BSP) adapters are also available.

What is the maximum temperature for LG2 bronze steam fittings?

LG2 bronze fittings are rated for steam service up to approximately 260°C at reduced pressure per ASME B16.15 class ratings. Always consult the specific pressure-temperature table for the fitting size and class before use in steam service.

Do you supply LG2 bronze fittings for fire sprinkler systems?

Yes. LG2 bronze fittings are specified in fire sprinkler systems per NFPA 13 where dezincification-resistant materials are required (typically in water chemistry with aggressive chloride or pH conditions). We supply BS 143 and ASME B16.15 fittings for fire protection contractors.

What is the minimum order quantity?

Standard stock items (½” to 2″): MOQ 50–100 pieces per size. Larger sizes (2½” to 4″) or non-standard configurations: MOQ 25 pieces, 3–4 week production lead time. Project/bulk orders exceeding 500 pieces receive priority scheduling and project pricing.

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Request a Quote for LG2 Bronze Pipe Fittings

Brass & Copper Parts India supplies LG2 gunmetal bronze pipe fittings (elbows, tees, hex nipples) to USA EPC contractors, power utilities, naval shipbuilders, fire protection engineers, and industrial distributors. Contact us with your fitting type, size, thread standard (BSP or NPT), quantity, and certification requirements (Lloyds, DNV, Bureau Veritas) for a competitive project quotation. Request a quote now.