ASTM B62

Covers — composition bronze (ounce metal, primarily alloy C83600, 85Cu-5Sn-5Pb-5Zn) sand castings for valve bodies, fittings, and pressure-containing components in general low-pressure service.

Does NOT cover (exclusions) — the following are governed elsewhere:

• Steel/alloy castings → ASTM A216 / A217 / A351.
• Bronze valve design/ratings → MSS SP-80.
• Higher-strength or dezincification-resistant bronzes → other ASTM B-series alloys.

B62 is the material behind small bronze valves; the valve rating and construction come from MSS SP-80.

B62 sets minimum requirements for the bronze casting:

• Chemistry — composition-bronze limits (Cu-Sn-Pb-Zn) for alloy C83600.
• Mechanical Properties — minimum tensile/yield and elongation.
• Soundness — casting quality suited to pressure-containing service.
• Testing — tension testing and, where specified, pressure/soundness checks.

ASTM B62 specifies composition bronze (ounce metal, alloy C83600) castings — the everyday material for small bronze valve bodies and fittings in water and general low-pressure service. It offers good machinability and corrosion resistance at modest cost.

It is the material behind MSS SP-80 bronze valves; the valve's ratings and construction come from that product standard. B62's modest strength and steep temperature derating keep it in mild, low-pressure applications.

Engineering Note: Bronze loses allowable pressure quickly with temperature — verify the derated rating at service temperature rather than the nominal cold-water class.