IS 291 GR l

IS 291 Gr I, commonly recognized as naval brass, garners frequent utilization across a diverse array of marine and subsea applications. Esteemed for its exceptional amalgamation of superior strength and robust corrosion resistance, this brass alloy further boasts effective property retention even under cryogenic conditions. Remarkably, IS 291 Gr I exhibits excellent hot formability and underscores a highly commendable level of corrosion resistance.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu61.0064.00
Pb0.20
Sn1.001.50
Fe0.10
Total0.20
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO IS 291 GR I (AS PER TEMPER HB)
Range (mm) From To UTS Min (MPa) PS Min Elongation Min (%) Hardness Min (HRB) Hardness Max (HRB)
Round (Dia)1.512.539018
12.55038018
507534518
Hex (A/F)312.539018
12.55038018
506534518
Square (A/F)312.539018
12.55038018
506034518
Rectangle (Thickness)312.539018
12.55038018
PHYSICAL PROPERTIES
Melting Point – Liquidus°F1650
Melting Points – Solidus 0F1630
Density lb/cu in. at 68 0F0.304
Specific Gravity8.41
Electrical Conductivity % IACS at 68 0F26
Thermal conductivity Btu/ Sq ft / ft hr / 0F at 680F67
Coefficient of Thermal Expansion 68-57210 -6 Per 0F (68-5720F)11.8
Specific Heat capacity Btu/ lb /0F at 680F0.09
Modulus of Elasticity in Tension ksi15000
Modulus of Rigidity ksi5600
FABRICATION PROPERTIES
TechniqueSuitability
Capacity for being Cold WorkedFair
Hot WorkedExcellent
Machinability Rating30%
Forgeability Rating90%
Silver Alloy BrazingExcellent
Soft SolderingExcellent
Oxyacetylene WeldingGood

IS 291 GR l

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