The difference between carbon steel wire and piano wire

The difference between carbon steel wire and piano wire

I. 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

II. 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.