Piano Wire｜High Tensile Strength, Excellent Elastic Recovery – Ideal for Mold Springs

Key Challenges in the IndustryIn the manufacturing of springs, molds, and small mechanical parts that must endure repeated stress over long periods, common problems include wire breaking after forming, inconsistent hardness between batches, and deformation or poor recovery after use. These issues result in springs failing to return to their designed force values, causing deviations in compression, tension, or part movement directly affecting system precision and reducing equipment lifespan.

Root Cause of the Problem

General wire products in the market often lack proper cold drawing and annealing control, resulting in residual stress, coarse grain structure, and inconsistent tensile strength. In real-world applications, the wire may fatigue or fail to recover properly, especially in springs or molds that undergo continuous cyclic loading.

Solution: High-Quality Wire from Yamaichi

Yamaichi Special Steel (Thailand) imports and distributes high-grade wire manufactured to Japanese standard JIS G3522, widely used in spring and mold industries worldwide. Every wire undergoes multiple stages of cold drawing and controlled annealing, producing wires with high and uniform tensile strength, excellent elasticity, and a smooth, glossy surface free of scratches. This makes them ideal for high-precision applications such as mold springs, machine springs, and industrial springs.

Specifications of YAMAICHI Wire

1. SWP-A — Standard Grade High Carbon Wire

• Made from high carbon steel
• Tensile Strength: ~1960–2160 MPa
• Smooth and consistent surface
• Suitable for general-purpose springs: tension, compression, and medium mold springs
• Well-suited for molds, machinery, and automotive applications

2. SWP-B — High Grade High Carbon Wire

• Undergoes multiple cold drawing and annealing stages
• Tensile Strength: ~2060–2260 MPa
• High toughness, resists brittleness even under repeated forming
• Better fatigue resistance than SWP-A
• Ideal for heavy mold springs, machine springs, and high-load clamping devices

3. SWP-V — Premium Grade Piano Wire

• Produced with vacuum degassing technology to minimize impurities
• Tensile Strength: ~2160–2350 MPa (highest in the group)
• Extremely fine grain structure
• Superior precision in elastic recovery
• Polished wire surface reduces friction and wear
• Ideal for valve springs, precision mold springs, and electronic components

Key Advantages of Yamaichi Wire

• Manufactured to Japanese standard JIS G3522
• ISO 9001:2015 certified quality control
• Precisely controlled tensile strength and elasticity
• Glossy, scratch-free surface
• Available in sizes from 0.1–10 mm
• Custom cut-to-length service and packaging available in spool or coil format as per customer specifications

※ For more information, please contact us below or download our brochure.

Glossary

• Tensile Strength – The maximum stress a material can withstand while being stretched or pulled before breaking
• Elastic Recovery – The ability of wire to return to its original shape after bending or compressive forces
• Residual Stress – Internal stress remaining in metal from drawing or heat treatment processes
• Fatigue Resistance – The wire’s ability to resist failure under repeated stress cycles

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