TB/T 1979 09CuPTiRE-A 5 Weather Resistant Steel

TB/T 1979 09CuPTiRE-A 5 Weather Resistant Steel

This premium weathering steel grade represents the highest performance level in China's railway material standards, combining advanced alloy design with exceptional atmospheric corrosion resistance. As the top-grade material in TB/T 1979, it delivers superior mechanical properties and durability for critical railway infrastructure applications.
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Description
Technical Parameters

Key Technical Parameters

Minimum Yield Strength: ≥345 MPa

Tensile Strength Range: 490-630 MPa

Elongation: ≥22%

Impact Toughness: ≥27J at -50°C (-5 grade designation)

Corrosion Resistance: 6-8 times better than carbon steel

Advanced Alloy Composition

Cu (0.25-0.45%): Forms stable protective patina

P (0.07-0.12%): Enhances atmospheric resistance

Ti (≤0.03%): Grain refinement for improved toughness

RE (Rare Earth): Optimized addition for enhanced properties

Cr (0.30-0.65%): Additional corrosion protection

Performance Characteristics

Extreme low-temperature toughness (-50°C performance)

Outstanding weathering resistance in harsh environments

Excellent fatigue resistance for dynamic load applications

Superior weldability with proper procedures

Self-forming protective oxide layer

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