The difference between carbon steel wire and piano wire
- Carbon spring steel wire
Carbon spring steel wire is the selection of high-quality carbon steel coils, isothermal quenching by the lead bath and then cold-dialed to strengthen and become. There are three groups by purpose
Group B: for general springs and other uses
Group C: for low-stress springs
Group D: For high stress springs
- Piano wire
Piano wire is selected with piano wire disc, quenched in a lead bath at room temperature made of pulls, according to its use can be divided into three groups
Group C1: Springs for various critical applications
Group C2: For various types of high stress springs
Group F: for valve springs
High carbon steel spring wire (SWC) gin wire (SWP-B) chemical composition table
Chemical composition of high carbon steel (SWC) (%)
Carbon (C) Silicon (Si) Manganese (Mn) Phosphorus (P) Sulfur (S)
0.69-0.70 0.15-0.35 0.60-0.90 0.03 0.03
Chemical composition of piano wire (SWP-B) (%)
Carbon (C) Silicon (Si) Manganese (Mn) Phosphorus (P) Sulfur (S) Copper (Cu)
0.80-0.85 0.12-0.32 0.30-0.60 0.025 0.025 0.20
Piano wire is also known as piano wire, belongs to high carbon steel.
Chinese standard: GB4358
American Standard: ASTM A228
Japanese Standard: JIS G 3522
Material composition:C:0.80-0.85 Si:0.12-0.32 Mn:0.3-0.6 P:below 0.025 S:below 0.025 Cu:below 0.2
The hardness range is 41-60 and the allowable temperature is 120°.
Piano wire is quenched by the lead bath cold-drawn from a very high strength limit and elastic limit, is widely used small spring material. Wire quality, performance requirements are strict, in addition to the tensile test, but also for torsion, corrosion, sharp carbon and other tests. According to the use can be divided into the manufacture of a variety of important spring, a variety of high stress and mechanical spring and latching door spring piano wire used.
SWPA and SWPB are piano wire
Specification number: JIS G 3522
Material composition:C:0.80-0.85 Si:0.12-0.32 Mn:0.3-0.6 P:below 0.025 S:below 0.025 Cu:below 0.2
The hardness range is 41-60.
Allowable temperature is 120°.
Different toughness and tensile strength
SWPB is higher.
