Excellent Din 1 2343 Steel Bar Thermal Fatigue Resistance - China

✅ Sources of DIN 1.2343 Steel Bar's Thermal Fatigue Resistance

Low vanadium content (0.3–0.5%): Compared to H13 (0.8–1.2% V), there are fewer grain-boundary carbides, resulting in higher toughness.

Optimized Cr-Mo-V ratio: 5% Cr + 1.3% Mo provides stable high-temperature strength and tempering stability.

Low thermal expansion coefficient: 11.8 × 10⁻⁶/°C; results in minimal dimensional changes and low thermal stress during thermal cycling.

Excellent thermal conductivity: Dissipates heat rapidly, reducing the temperature gradient between the mold surface and the core.

Deep hardenability: Suitable for air or oil quenching; ensures uniform cross-sectional hardness and reduces stress concentration.

Secondary hardening effect: Precipitation of M₂C/M₇C₃ carbides after tempering at 500–550°C strengthens the matrix.

⚠️ Impact of Oxidation on Thermal Fatigue (Research Data)

Based on a study of X38CrMoV5 thermal fatigue published on ScienceDirect (cycling between 100°C and 650°C):

Oxidation layers in an air environment accelerate crack initiation and propagation.

Fatigue life is significantly extended in inert atmospheres (Ar/N₂).

Surface nitriding can effectively inhibit oxidation-assisted cracking.

Combining with PVD coatings (TiAlN/CrN) is recommended to further extend service life.

???? Recommendations for Extending Service Life

DIN 1.2343 steel bar Utilizing a combined process of ESR (Electroslag Remelting), nitriding, and PVD coating can further increase thermal fatigue life by 30–40%.

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