IS 6921 FNB

IS 6921 FNB, commonly recognized as Naval Brass, is frequently utilized across a diverse array of marine and subsea applications. Esteemed for its exceptional combination of superior strength and robust corrosion resistance, this brass alloy further boasts effective property retention even under cryogenic conditions. Notably, IS 6921 FNB demonstrates excellent hot formability and showcases a highly commendable level of corrosion resistance.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu61.0064.00
Pb0.20
Sn1.001.50
Fe0.10
Total0.50
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO IS 6921 (AS PER TEMPER HB)
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia)1.57534015
Hex (A/F)37034015
Square (A/F)36034015
Rectangle (Thickness)35034015
PHYSICAL PROPERTIES
Melting Points – Liquidus 0F1650
Melting Points – Solidus 0F1630
Density lb/cu in. at 68 0F0.304
Specific Gravity8.41
Electrical Conductivity % IACS at 68 0F26
Thermal conductivityBtu/ 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%
Forge ability Rating90%
Silver Alloy BrazingExcellent
Soft SolderingExcellent
Oxyacetylene WeldingGood

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