alloy project piano wire - weebly

1085 SteelPiano Wire

History of the Piano

Bartolomeo CristoforiEarly 1700s

History of the Piano

Harpsichord before the Piano

History of the Piano

Industrial Revolutionintroduced high

quality steel

History of the Piano

From 5 to 7 octaves

Tuning a Piano170 lbs tension

per string

Chemical Composition

Iron97.98-98.41%Base material

Chemical Composition

Carbon0.8-0.93%

Adds Strength

Chemical Composition

Manganese0.7-1.0%

Solid solubility hardening

Chemical Composition

Phosphorus0.04% max

Trace element

Chemical Composition

Sulfur0.05% max

Trace Material

Mechanical Properties

Tensile Strength393 ksi

Deals with tension

Mechanical Properties

Yield Strength78 ksi

Deals with Elasticity

Mechanical Properties

Hardness587-614 BHN80-83 Ra58-63 Rc

Mechanical Properties

StressApprox 228.6 lbs/mm

Mechanical Properties

Fatigue Resistance 10⁷ cycles

Other Properties

Elasticity190-210 GPa

Other PropertiesPhase Diagram

1085 steel

Manufacturing ProcessesPiano Wire Process

Manufacturing ProcessesPatenting

Manufacturing Processes

Piano Wire Process

Piano Action- Complex lever system- Hammer hits string- String vibrates- Vibrations is transferred to soundboard via bridge

Physics of SoundSound is a waveSound is produced by the string and soundboard vibrating

Higher sounds are caused by more frequencyLouder Sounds are produced by higher amplitude

Demonstration