CZ121PB4

DESCRIPTION

CZ121Pb4, Free cutting brass, is a significantly improved form of 60/40 brass, with excellent free cutting properties. It is used in the mass production of brass components where maximum output and longest tool life are required, and where no further cold forming after machining is required.

CHEMICAL COMPOSITION

Elements Min (%) Max (%)
Cu 56.50 58.50
Pb 3.50 4.50
Fe - 0.30
Total Others - 0.70
Zn Remainder

Mechanical Properties According To BS2874 (As Per Temper M)

Range (mm) From To UTS Min (N/mm²) PS Min Elongation (%) Hardness Min Hardness Max
Round (Dia) 2 18 425 - 15 - -
18 40 400 - 18 - -
40 75 380 - 20 - -
Hex (A/F) 3 18 425 - 15 - -
18 40 400 - 18 - -
40 70 380 - 20 - -
Square (A/F) 3 18 425 - 15 - -
18 40 400 - 18 - -
40 60 380 - 20 - -
Rectangle (Thickness) 3 18 425 - 15 - -
18 40 400 - 18 - -
40 50 380 - 20 - -
PHYSICAL PROPERTIES
Melting Point - Liquidus°F 1630
Melting Point - Solidus°F 1610
Densitylb/cu in. at 68°F 0.306
Specific Gravity 8.47
Electrical Conductivity% IACS at 68°F 28
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 71
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 11.6
Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tensionksi 14000
Modulus of Rigidityksi 5300
FABRICATION PROPERTIES
Technique Suitability
Soldering Excellent
Brazing Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Not Recommended
Coated Metal Arc Welding Not Recommended
Spot Weld Not Recommended
Seam Weld Not Recommended
Butt Weld Fair
Capacity for Being Cold Worked Poor
Capacity for Being Hot Formed Excellent
Machinability Rating 90

TYPICAL USES

  • Architecture
  • Builders Hardware
  • Consumer
  • Industrial
  • Ordnance