IS 291 GR II

IS 291 Gr II Naval Brass finds prominent application in diverse sectors, primarily for machine hardware, screw machine products, and valve stems. This variant, IS 291 Gr II Naval Brass, stands out as an excellent option for operations involving hot forging, pressing, and machining. Boasting elevated ductility, this naval brass variant also excels in terms of both electrical and thermal conductivity. Moreover, IS 291 Gr II Naval Brass demonstrates commendable resistance to creep and impressive impact strength.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu59.0062.00
Pb0.501.00
Sn0.501.00
Fe0.10
Total0.20
ZnRemainder
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)1.57539015
Hex (A/F)36539015
Square (A/F)36039015
Rectangle (Thickness)35039015
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

IS 291 GR II

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