LIANYUNGANG DAPU METAL CO.LTD
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High Performance Alloys

Spring Steel: Engineered
for Resilience.

Designed for high yield strength and exceptional fatigue resistance. Our spring steel grades provide the reliability needed for automotive suspensions, industrial tools, and precision machinery.

600-1600 MPa Yield Strength
~210 GPa Elastic Modulus
40-55 HRC Typical Hardness
High performance spring steel coil
Material Performance

Critical Engineering Benefits

Spring steel is defined by its ability to withstand high stress levels and return to its original shape without permanent deformation.

01
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High Yield Strength

Engineered with an exceptional elastic limit, allowing components to endure heavy loads and return to their original profile with zero plastic deformation.

02
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Fatigue Life

Specifically alloyed to withstand cyclic loading. Through precise heat treatment, it maintains structural integrity over millions of compression and tension cycles.

03
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Uniform Hardness

Excellent hardenability ensures deep and consistent through-hardening, even in large sections, providing a perfect balance between surface rigidity and core toughness.

04
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Impact Toughness

The unique metallurgical structure provides superior shock absorption, making it ideal for high-impact mechanical parts, cutting tools, and heavy-duty springs.

Standard Specifications

Strategic Grade Matrix

Select the optimal alloy based on fatigue requirements and tensile strength.

65Mn AISI 1065 / GB
Tensile Strength ≥ 980 MPa
Hardness (HRC) 28 - 34 (Annealed)
Main Features High Machinability
● Best Value

Standard choice for saw blades, flat springs, and agricultural machinery parts.

60Si2Mn ASTM 9260 / DIN
Yield Strength ≥ 1175 MPa
Elastic Limit Excellent
Main Features Silicon-Manganese Alloy
● Performance

Engineered for heavy-duty coil springs and automotive suspension systems.

50CrV4 AISI 6150 / DIN 1.8159
Yield Strength ≥ 1300 MPa
Heat Resistance Up to 300°C
Main Features Chrome-Vanadium Alloy
● Premium

Ideal for high-stress valve springs and high-temperature industrial components.

Manufacturing Excellence

The Hardening & Tempering Cycle

Spring steel achieves its performance through a strictly controlled thermal transformation process.

01

Forming

Hot or cold coiling into shape. Internal stresses are introduced during this mechanical deformation stage.

02

Hardening

Heating above the critical temperature (Austenitizing) followed by rapid quenching to create a Martensitic structure.

03

Tempering

Reheating to a specific range to reduce brittleness while locking in the maximum elastic limit and toughness.

04

Shot Peening

Bombarding the surface with steel shot to create compressive residual stress, exponentially increasing fatigue life.

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The TTT Curve Importance

Precise control over the cooling rate ensures the avoidance of pearlite formation, securing a 100% martensitic transformation for uniform elasticity across the entire component.

Cross-Industry Usage

Proven Industrial Success

From high-speed precision instruments to heavy-duty machinery.

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Automotive

  • Suspension Coil Springs
  • Clutch Diaphragms
  • Engine Valve Springs
⚙️

Industrial

  • Conveyor Scrapers
  • Mechanical Fasteners
  • Vibration Dampers
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Tooling

  • High-Strength Saw Blades
  • Professional Pliers
  • Scrapers & Spatulas
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Specialized

  • Aerospace Elastic Links
  • Medical Surgical Clips
  • Precision Measuring Tapes
Engineering Support

Technical Insights

Generally, welding spring steel is not recommended. The high localized heat creates a Heat Affected Zone (HAZ) that destroys the tempered microstructure, leading to either extreme brittleness or permanent softening. If welding is mandatory, the component must undergo a full re-hardening and tempering cycle to restore its spring properties.
This phenomenon is known as stress relaxation. It occurs when a spring is held at high stress levels for extended periods, especially at elevated temperatures. Choosing the right alloy, like 50CrV4 (Chrome-Vanadium), and ensuring proper shot peening can significantly mitigate this loss of resilience.
While 65Mn is an excellent high-carbon steel for general tools, 60Si2Mn offers a much higher elastic limit and better hardenability due to the addition of Silicon and Manganese. This makes 60Si2Mn the superior choice for automotive suspensions and heavy-duty industrial springs that require greater fatigue resistance.
Carbon spring steels are prone to oxidation. Common protection methods include Electroplating (Zinc or Nickel), Phosphating, or Powder Coating. However, when electroplating, it is critical to perform a "Baking" process to prevent hydrogen embrittlement, which can cause the spring to snap under load.