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Compare verified materials with source-specific conditions, units, and property limits.

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Temper & Metallurgical Context Qualification:The selected records contain different or missing source contexts. Values shown in separate rows are not directly matched. Typical and estimated values are not guaranteed minima; matching context alone does not establish interchangeability.
1. Identity, Classification & Standards
ParameterC54400 Free-Machining Phosphor Bronze (B-2)C51000 Phosphor Bronze 5% A
Material FamilyCopper AlloysCopper Alloys
SubfamilyPhosphor BronzePhosphor Bronze
UNS DesignationC54400C51000
COMMERCIAL DesignationFree-Machining Phosphor BronzePhosphor Bronze Grade A
CDA DesignationAlloy 544Alloy 510
SPECIFICATION DesignationASTM B139/B139MASTM B139/B139M
2. Chemical Composition Limits (wt %)Source-specific limits and typical values
ElementC54400 Free-Machining Phosphor Bronze (B-2)C51000 Phosphor Bronze 5% A
Cu (Copper)Bal.Bal.
Pb (Lead)3 – 4%≤ 0.05%
Sn (Tin)3.5 – 4.5%4.2 – 5.8%
Zn (Zinc)1.5 – 4.5%≤ 0.3%
Fe (Iron)≤ 0.1%≤ 0.1%
P (Phosphorus)0.01 – 0.5%0.03 – 0.35%
3. Physical Properties
PropertyC54400 Free-Machining Phosphor Bronze (B-2)C51000 Phosphor Bronze 5% A
Density · TYPICAL · 20 °CUnit: g/cm³8.858 g/cm³8.858 g/cm³
4. Contextual Mechanical PropertiesUnit: SI
Mechanical ParameterC54400 Free-Machining Phosphor Bronze (B-2)1/2 Hard (H02)C51000 Phosphor Bronze 5% A1/2 Hard (H02)
Modulus of Elasticity (Tension) · TYPICALUnit: GPa103.4 GPa110.3 GPa
Modulus of Rigidity · TYPICALUnit: MPa38610.6 MPa41368.5 MPa
Machinability Rating · TYPICALUnit: %80 %20 %
Tensile Strength · Flat Products · 0.04 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa399.9 MPa— MPa
Tensile Strength · Flat Products · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa— MPa455.1 MPa
Tensile Strength · Rod · 1 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa— MPa482.6 MPa
Tensile Strength · Rod · 0.5 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa— MPa517.1 MPa
Tensile Strength · Wire · 0.08 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa— MPa586.1 MPa
Yield Strength (0.5% Ext) · Flat Products · 0.04 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa275.8 MPa— MPa
Yield Strength (0.5% Ext) · Flat Products · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa— MPa372.3 MPa
Yield Strength (0.5% Ext) · Rod · 0.5 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: MPa— MPa448.2 MPa
Elongation · Flat Products · 0.04 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: %24 %— %
Elongation · Flat Products · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: %— %24 %
Elongation · Rod · 1 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: %— %25 %
Elongation · Rod · 0.5 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: %— %25 %
Elongation · Wire · 0.08 · 1/2 Hard (H02) · TYPICAL · 20 °CUnit: %— %8 %
5. Electrical & Thermal Conductive Properties
PropertyC54400 Free-Machining Phosphor Bronze (B-2)C51000 Phosphor Bronze 5% A
Electrical Conductivity · TYPICAL · 20 °CCategory: ELECTRICAL • Unit: % IACS19 % IACS15 % IACS
Liquidus Temperature · TYPICALCategory: THERMAL • Unit: °C998.9 °C1048.9 °C
Solidus Temperature · TYPICALCategory: THERMAL • Unit: °C926.7 °C954.4 °C
Thermal Conductivity · TYPICAL · 20 °CCategory: THERMAL • Unit: W/(m·K)86.54 W/(m·K)69.23 W/(m·K)
Coefficient of Thermal Expansion (CTE) · TYPICALCategory: THERMAL • Unit: µm/(m·K)17.28 µm/(m·K)17.82 µm/(m·K)
Specific Heat Capacity · TYPICAL · 20 °CCategory: THERMAL • Unit: J/(kg·K)376.8 J/(kg·K)376.8 J/(kg·K)
Annealing Temperature Range · RANGECategory: THERMAL • Unit: °C482.2–676.7 °C482.2–676.7 °C
6. Hardness Evaluation (Discrete Scales Preserved)No cross-scale mathematical conversion
Hardness ScaleC54400 Free-Machining Phosphor Bronze (B-2)C51000 Phosphor Bronze 5% A
Rockwell B Hardness · Flat Products · 0.04 · 1/2 Hard (H02) · TYPICAL68 HRB—
Rockwell B Hardness · Flat Products · 1/2 Hard (H02) · TYPICAL—78 HRB
Rockwell B Hardness · Rod · 1 · 1/2 Hard (H02) · TYPICAL—78 HRB
Rockwell B Hardness · Rod · 0.5 · 1/2 Hard (H02) · TYPICAL—80 HRB
Rockwell 30T Hardness · Flat Products · 1/2 Hard (H02) · TYPICAL—69 HR30T
7. Fabrication & Processing Comparison
C54400 Free-Machining Phosphor Bronze (B-2) Characteristics:

Machinability: Machinability rating: 80% relative to free-cutting brass (C36000 = 100%).

Weldability: 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

Formability / Cold Working: Capacity for Being Cold Worked: Good.

Heat Treatment & Annealing: Annealing temperature range: 482.2°C to 676.7°C (900°F - 1250°F).

C51000 Phosphor Bronze 5% A Characteristics:

Machinability: Machinability rating: 20% relative to free-cutting brass (C36000 = 100%).

Weldability: Soldering: Excellent; Brazing: Excellent; Oxyacetylene Welding: Fair; Gas Shielded Arc Welding: Good; Coated Metal Arc Welding: Fair; Spot Weld: Good; Seam Weld: Fair; Butt Weld: Excellent

Formability / Cold Working: Capacity for Being Cold Worked: Excellent. Capacity for Being Hot Formed: Poor.

Heat Treatment & Annealing: Annealing temperature range: 482.2°C to 676.7°C (900°F - 1250°F).

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