ASTM B62 C83600 Fittings – Composition Bronze (85-5-5-5)
What is ASTM B62? ASTM B62 is the standard specification for composition bronze or ounce metal castings. It covers one alloy – UNS C83600, also called 85-5-5-5 or leaded red brass (about 85% copper and 5% each of tin, lead and zinc) – used for cast valves, flanges and pipe fittings.
ASC LLP supplies ASTM B62 C83600 fittings – threaded, socket (solder) and flanged – to ASME B16.15, B16.18 and B16.24 dimensions, with EN 10204 3.1 certificates. See also our copper alloy fittings range.
C83600 Chemical Composition (ASTM B62)
| Element | Composition (wt %) |
| Copper (Cu) | 84.0 – 86.0 |
| Tin (Sn) | 4.0 – 6.0 |
| Lead (Pb) | 4.0 – 6.0 |
| Zinc (Zn) | 4.0 – 6.0 |
| Iron (Fe) | 0.30 max |
| Antimony (Sb) | 0.25 max |
| Nickel (Ni, incl. Co) | 1.0 max |
| Sulphur (S) | 0.08 max |
| Phosphorus (P) | 0.05 max |
| Aluminium (Al) | 0.005 max |
| Silicon (Si) | 0.005 max |
The lead does not dissolve in the copper – it sits as fine particles that make C83600 easy to machine and help castings stay pressure-tight. Tin adds strength and corrosion resistance; zinc helps casting fluidity.
Key Properties & Advantages of C83600 Fittings
- Pressure-tight castings: 85-5-5-5 bronze casts well and gives sound, leak-tight valve and fitting bodies.
- Excellent machinability: the lead content makes threading and machining fast and clean.
- Good corrosion resistance: performs well in fresh water, low-pressure steam, oils and mildly corrosive industrial fluids; resists dezincification better than ordinary brass.
- Moderate strength: 205 MPa (30 ksi) minimum tensile – suited to low- and medium-pressure service.
- Easy to join: threaded, soldered or brazed connections (leaded bronze is not normally welded).
- Economical: lower cost than stainless steel or nickel-alloy fittings for water and general service.
C83600 Fitting Types, Sizes & Standards
| Item | Details |
| Fitting types | Elbows (45°/90°), tees, crosses, couplings, unions, reducers, caps, plugs, bushings, nipples, flanges |
| Threaded fittings | ASME B16.15 (cast copper-alloy threaded fittings, Class 125 / 250) |
| Solder-joint fittings | ASME B16.18 (cast copper-alloy solder-joint pressure fittings) |
| Flanges | ASME B16.24 (cast copper-alloy pipe flanges, Class 150 / 300) |
| Sizes | 1/4″ to 4″ NB typical; larger sizes on request |
| End connections | Threaded (NPT / BSP), solder (socket), flanged |
| Production | Sand or centrifugal cast, then machined |
Mechanical Properties of ASTM B62 C83600
| Property | ASTM B62 minimum |
| Tensile strength | 205 MPa (30 ksi) |
| Yield strength | 95 MPa (14 ksi) |
| Elongation in 50 mm | 20% |
| Hardness (typical) | ≈ 60 HB |
ASTM B62 C83600 Fittings – Specifications
| Item | Details |
| Material standard | ASTM B62 – composition bronze or ounce metal castings |
| Alloy | UNS C83600 (85-5-5-5, leaded red brass) |
| Related castings standards | ASTM B584 (sand castings), B271 (centrifugal), B505 (continuous) |
| Dimensional standards | ASME B16.15, B16.18, B16.24 |
| Product forms | Fittings, flanges, valve bodies and components |
| Test certificate | EN 10204 3.1; third-party inspection on request |
C83600 Equivalent Grades
| Standard | Equivalent designation |
| UNS | C83600 |
| Common name | 85-5-5-5, leaded red brass, ounce metal, composition bronze |
| EN 1982 | CuSn5Zn5Pb5-C (CC491K) |
| BS 1400 (old) | LG2 |
| JIS H5120 | CAC406 |
Equivalents are close but not identical – check chemistry and test requirements before substituting.
Physical Properties of C83600
| Property | Value (approx.) |
| Density | 8.80 g/cm³ (0.318 lb/in³) |
| Melting range | 854 – 1,010 °C (1,570 – 1,850 °F) |
| Thermal conductivity | ≈ 72 W/m·K |
| Electrical conductivity | ≈ 15% IACS |
| Coefficient of thermal expansion | ≈ 18 µm/m·°C (20–300 °C) |
| Modulus of elasticity | ≈ 90 GPa (13 × 10⁶ psi) |
Applications of ASTM B62 C83600 Fittings
| Industry | Typical uses |
| Water & utilities | Valves, fittings and flanges for water service (check local lead limits for drinking water) |
| Steam & HVAC | Low-pressure steam, heating and cooling lines, pump and valve bodies |
| Fire protection | Fire-hydrant and sprinkler-system valves and fittings |
| Marine | Fittings and valve parts for fresh-water and auxiliary systems |
| Oil & process | Fittings for oils, fuels and mildly corrosive fluids at low pressure |
Note: C83600 contains about 5% lead. For drinking-water systems where lead-free materials are required, ask us about lead-free bronze alternatives.
Why Buy ASTM B62 C83600 Fittings from ASC LLP?
- Certified material: ASTM B62 castings with EN 10204 3.1 certificates and heat traceability.
- Full range: threaded, solder and flanged fittings to ASME B16.15, B16.18 and B16.24.
- Matching products: C83600 flanges, ASTM B61 steam bronze fittings and other copper alloys.
- Inspection: PMI, pressure testing and third-party inspection on request.
- Export packing and regular shipments worldwide.
Send your size, type, class and quantity to sales@amardeepsteel.com or call 022-67439130.
Frequently Asked Questions – ASTM B62 C83600
What does ASTM B62 mean?
ASTM B62 is the standard specification for composition bronze or ounce metal castings. It covers copper alloy UNS C83600 (85-5-5-5 leaded red brass), used for cast valves, flanges and pipe fittings.
What is the chemical composition of C83600?
C83600 contains 84.0–86.0% copper and 4.0–6.0% each of tin, lead and zinc, with small limits on iron (0.30 max), antimony (0.25 max), nickel (1.0 max), sulphur (0.08 max) and phosphorus (0.05 max).
What are the mechanical properties of ASTM B62 C83600?
ASTM B62 requires a minimum tensile strength of 205 MPa (30 ksi), minimum yield strength of 95 MPa (14 ksi) and minimum elongation of 20%.
Is C83600 brass or bronze?
C83600 is a leaded tin bronze – often called leaded red brass, composition bronze, ounce metal or 85-5-5-5. It contains about 5% tin, which is why ASTM calls it composition bronze.
What is the difference between ASTM B62 and ASTM B61?
ASTM B62 covers C83600 composition bronze for general water and low-pressure service. ASTM B61 covers C92200 steam or valve bronze, which has higher tin and is rated for higher steam temperatures and pressures.
Can C83600 fittings be welded?
Leaded bronzes like C83600 are not normally welded. Fittings are joined by threading, soldering or brazing, or with flanges.
Global Reach
ASC LLP supplies copper-alloy fittings, flanges and pipes to water, HVAC, marine and process-industry customers worldwide, with prompt delivery and full documentation. Buyers in the USA, Europe, the Middle East and Asia rely on our ASTM B62 C83600 fittings for certified material and traceability.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
