IS 291 GR II

DESCRIPTION

IS 291 Gr II Naval Brass is mostly used for machine hardware, screw machine products and valve stems, IS 291 Gr ll Naval Brass is great for hot forging, pressing and machining. With high ductility, naval brass has excellent electrical and thermal conductivity. IS 291 Gr II naval brass has good creep resistance and high impact strength.

CHEMICAL COMPOSITION

Elements Min (%) Max (%)
Cu59.0062.00
Pb0.501.00
Sn0.501.00
Fe-0.10
Total -0.20
Zn Remainder

Mechanical Properties According To IS 291 Gr II (As Per Temper HB)

Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia)1.575390-15--
Hex (A/F)365390-15--
Square (A/F)360390-15--
Rectangle (Thickness)350390-15--
PHYSICAL PROPERTIES
Melting Point - Liquidus°F1650
Melting Point - Solidus°F1630
Density lb/cu in. at 68°F0.305
Specific Gravity8.44
Electrical Conductivity % IACS at 68°F26
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F67
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F)11.8
Specific Heat Capacity Btu/ lb /°F at 68°F0.09
Modulus of Elasticity in Tension ksi15000
Modulus of Rigidity ksi5600
FABRICATION PROPERTIES
TechniqueSuitability
SolderingExcellent
BrazingGood
Oxyacetylene WeldingNot Recommended
Gas Shielded Arc WeldingNot Recommended
Coated Metal Arc WeldingNot Recommended
Spot WeldNot Recommended
Seam WeldNot Recommended
Butt WeldFair
Capacity for Being Cold WorkedPoor
Capacity for Being Hot FormedGood
Forgeability Rating90
Machinability Rating70

Typical uses

  • Fasteners
  • Industrial
  • Marine