Gunmetal Sand Casting, LG2 Bronze Sand Casting & Red Brass Sand Casting from Indian casting Foundry
Overview – Gunmetal, LG2 Bronze & Red Brass Sand Castings for Global Applications
We are one of the leading manufacturers and exporters of Gunmetal Sand Castings, LG2 Bronze Sand Castings, and Red Brass Sand Castings from India. We have been supplying high-quality Bronze and Red Brass cast components to the world market for many decades, catering to customers across the USA, Canada, UK, Europe, and Australia. Our products are widely trusted for pressure integrity, corrosion resistance, dimensional stability, and long service life, particularly in waterworks, plumbing, marine, HVAC, and general engineering applications.
Backed by over three decades of international experience, our foundry blends proven metallurgical practices with modern sand casting process control, spectrometer-based melt chemistry, and CNC-ready casting design. We manufacture in compliance with ASTM, BS, IS, DIN, JIS, and EN standards, ensuring consistency and global acceptance. Our team works closely with OEMs and importers to refine designs, optimize wall sections, and reduce machining and rejection costs. The result is a dependable supply of Gunmetal, LG2 Bronze, and Red Brass sand castings that meet both technical and commercial expectations.
Gunmetal Sand Casting
Gunmetal Sand Casting remains one of the most reliable solutions for pressure-bearing and corrosion-resistant components. This traditional Bronze alloy, typically based on Copper, Tin, Zinc, and Lead, offers an excellent balance of castability, strength, and machinability. Sand casting allows flexibility in size and geometry, making Gunmetal ideal for valve bodies, bonnets, flanges, and pipe fittings. When properly melted and poured, Gunmetal produces dense, pressure-tight castings suitable for water, steam, and mild industrial media.
LG2 Bronze Sand Casting (BS 1400 LG2 / CC491K)
LG2 Bronze Sand Casting is a premium leaded tin Bronze alloy widely specified in the UK, Europe, and increasingly in the USA. Known for its excellent resistance to dezincification, erosion, and marine corrosion, LG2 is commonly used in potable water systems and marine environments. Its controlled Lead content improves machinability without compromising pressure integrity, making LG2 Bronze a preferred choice for high-reliability valve and pump components.
Red Brass Sand Casting
Red Brass Sand Casting refers to high-Copper Bronze alloys with minimal Zinc content, offering superior corrosion resistance and excellent longevity in water and plumbing applications. Commonly associated with alloys such as ASTM B584 C84400 and C83600 (in certain markets), Red Brass is widely used in the USA plumbing and waterworks industry. Red Brass sand castings are valued for their low dezincification risk, good pressure tightness, and smooth machinability, making them suitable for valves, fittings, meter bodies, and municipal hardware. Compared to Yellow Brass, Red Brass provides better long-term reliability in aggressive or potable water conditions.
CDA 836 Bronze Sand Casting (ASTM B584 C83600)
CDA 836 Bronze Sand Casting, also known as 85-5-5-5 Bronze, is one of the most commonly specified Gunmetal-type alloys in North America. Its balanced composition ensures excellent fluidity during casting, low shrinkage defects, and consistent mechanical properties. CDA 836 is widely used for valve bodies, pump housings, and bearing components where leak resistance and machinability are critical.
Cu85Zn5Pb5Sn5 Bronze Casting
Cu85Zn5Pb5Sn5 Bronze casting represents the classical Gunmetal formulation used globally for decades. Zinc enhances fluidity, Tin provides strength and corrosion resistance, and Lead improves machinability. This alloy performs reliably in sand casting and is often selected for complex geometries requiring secondary machining.
85-5-5-5 Gunmetal Bronze Alloy Casting
85-5-5-5 Gunmetal Bronze Alloy Casting is widely accepted across international standards and legacy specifications. When produced with controlled melting and feeding, it delivers uniform microstructure, good pressure retention, and predictable machining behavior, making it suitable for export-oriented and long-term supply programs.
Material Grades & International Equivalents
|
Standard |
Grade / Designation |
Common Name |
|
ASTM |
B584 C83600 |
CDA 836 / 85-5-5-5 |
|
ASTM |
B584 C84400 |
Red Brass |
|
BS |
BS 1400 LG2 / CC491K |
LG2 Gunmetal |
|
IS |
IS 318 LTB2 |
Gunmetal Bronze |
|
DIN |
DIN 1705 G-CuSn5ZnPb |
Gunmetal |
|
JIS |
BC6 |
Tin Bronze |
|
EN |
EN 1982 CC491K |
LG2 Equivalent |
|
China (GB) |
ZCuSn5Pb5Zn5 |
Gunmetal |
Manufacturing Process – Bronze & Red Brass Sand Casting
Our sand casting process uses high-quality molding sand, optimized gating systems, and controlled pouring temperatures to achieve sound, dense castings. All melts are verified using spectrometers to ensure compliance with specified chemistry. Post-casting operations include fettling, shot blasting, dimensional checks, and optional CNC machining.
Machinery & Infrastructure
We operate induction furnaces, sand mixers, core shooters, spectrometers, shot blasting machines, CNC machining centers, VMCs, and precision inspection equipment, enabling us to deliver as-cast or fully machined Bronze and Red Brass components.
Typical Parts Produced
Gunmetal, LG2 Bronze, and Red Brass sand castings are commonly supplied as valve bodies, bonnets, pump casings, impellers, plumbing fittings, elbows, tees, flanges, strainers, meter bodies, marine hardware, and custom engineered components.
Indicative Dimensional Capability
|
Parameter |
Typical Range |
|
Casting Weight |
0.5 kg to 250 kg |
|
Wall Thickness |
5 mm to 40 mm |
|
Maximum Length |
Up to 800 mm |
|
Surface Finish (As Cast) |
Ra 12.5–25 µm |
Tolerances, Finish & Quality
Typical sand casting tolerances meet ISO 8062 CT8–CT10. Surface finish options include natural, shot-blasted, or customer-specified coatings. Plating such as Tin or Nickel can be provided on request.
Industries Served
Our products serve Waterworks, Plumbing, Municipal infrastructure, Marine, HVAC, Fire protection systems, Oil & Gas (low pressure), Power plants, and General engineering industries, with strong demand from the USA market.
Turnaround Time, Packaging & Shipping
Standard turnaround time is 4–6 weeks. We provide export-grade packaging, customized cartons, customer labels, barcoding, and palletized shipments, ensuring safe global delivery.
Why Choose Us
Customers choose us for technical competence, responsive communication, flexible production planning, and over 30 years of global foundry experience. Our engineering team actively supports drawing optimization, alloy selection, and cost-effective casting design, helping customers improve overall value.
Customer Testimonials
John M., USA
“Reliable Red Brass and LG2 Bronze castings with consistent quality. Communication and documentation were excellent.”
David H., Australia
“Gunmetal sand castings met all specifications. The team’s technical input helped us reduce machining time.”
Glossary of Terms
Red Brass – High-Copper Bronze alloy with excellent corrosion resistance.
Gunmetal – Traditional Bronze alloy for pressure-bearing applications.
LG2 Bronze – British Standard leaded tin Bronze (CC491K).
Sand Casting – Casting method using sand molds for complex shapes.
Pressure Tightness – Ability of a casting to resist leakage under pressure.
Sand Casting – Manufacturing process creating metal components by pouring molten metal into expendable sand molds formed around patterns reproducing desired geometry.
Gunmetal – Copper-Tin-Zinc-Lead quaternary alloy originally developed for cannon manufacturing, now widely used for marine hardware, valves, and corrosion-resistant components.
LG2 Bronze – British Standard designation for leaded Gunmetal composition with approximately 85% Copper, 5% Tin, 5% Zinc, and 5% Lead per BS 1400-1985.
Dezincification – Selective corrosion mechanism removing Zinc from Copper alloys in certain environments, leaving porous Copper-rich residue with degraded mechanical properties.
Pattern – Replica of desired casting geometry used to form sand mold cavity, incorporating allowances for shrinkage, machining stock, and draft angles facilitating removal.
Core – Sand insert placed in mold cavity to form internal passages, cavities, or undercut features in finished casting.
Gating System – Channels including sprue, runner, and ingate controlling molten metal flow from pouring basin into mold cavity.
Riser – Reservoir of molten metal feeding solidification shrinkage in casting sections, preventing porosity in finished component.
Fettling – Removal of gating systems, risers, and excess material from castings after solidification and mold removal.
Green Sand – Molding material mixture of silica sand, bentonite clay, water, and additives used in reusable molding systems.
Draft Angle – Taper incorporated in pattern geometry facilitating removal from sand mold without damage to mold cavity surfaces.
Shrinkage Allowance – Dimensional increase in pattern geometry compensating for thermal contraction as molten metal solidifies and cools to room temperature.
Machinability – Material characteristic describing ease of chip formation, tool wear rates, and surface finish quality during machining operations.
Antimicrobial – Property of Copper-based alloys including Bronze inhibiting bacterial growth on component surfaces through oligodynamic effect.
Related Terms
Red Brass Sand Casting, Gunmetal Bronze Casting, LG2 Bronze Foundry India, CDA 836 Bronze Manufacturer, Bronze Valve Body Casting Exporter, Bronze Sand Casting Services, Gunmetal Casting Manufacturer, LG2 Bronze Components, Marine Bronze Castings, C83600 Bronze Casting, 85-5-5-5 Gunmetal Alloy, Leaded Bronze Castings, Copper Alloy Sand Casting, Bronze Valve Bodies, Marine Hardware Castings, Pump Housing Bronze Casting, Bearing Housing Gunmetal, Seawater Resistant Bronze, Corrosion Resistant Copper Alloy, Bronze Propeller Components, Ship Fitting Castings, Industrial Bronze Valves, Bronze Gear Blanks, Copper Tin Zinc Lead Alloy, BS 1400 LG2 Bronze, ASTM B584 C83600, EN 1982 CC491K Bronze, Pressure Tight Bronze Casting,
Call to Action
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Contact us today for a quote, request a technical brochure, or reach out via email, phone, or WhatsApp. Our team is ready to support your next project.