Application Focus

Forging Dies

Balancing core toughness with high surface hardness to combat heat checking, thermal cracking, and severe mechanical impact during hot forging operations.

The Challenge and Solutions

In forging, dies undergo massive mechanical impact and extreme temperature fluctuations. The primary cause of failure is the combined effect of thermal and mechanical stress, leading to "heat checking" (a network of micro-cracks) that quickly propagates into full thermal cracks.

Shital Plasma Nitriding addresses these issues by improving surface fatigue strength and thermal stability, ensuring your forging dies can withstand extreme manufacturing environments.

Forging Die 1 Forging Die 2 Forging Die 3

How We Solve Forging Die Challenges

Problem Faced Mechanism of Plasma Nitriding Solution
Heat Check Marks Induces high compressive residual stresses in the surface, which effectively counteracts the tensile stresses that cause surface micro-cracking.
Thermal Cracks Improves surface toughness and fatigue resistance, preventing small heat checks from expanding into deep, catastrophic structural failures.
Thermal Shocks Stabilizes the surface microstructure, allowing the die to handle the rapid temperature transitions between the hot workpiece and the cooling cycle without surface degradation.
Corrosion of Dies Provides a dense, metallic nitride barrier that protects the die surface against scaling and oxidation caused by high-temperature contact with forging lubricants and oxides.

Material Specifications for Forging Dies

Forging dies require materials that balance core toughness with the surface hardness provided by plasma nitriding. The following specifications focus on typical hot-work tool steels used in forging applications.

Material / Grade Application Area Target Surface Hardness Recommended Case Depth
H13 (1.2344) Standard Forging Inserts 950 – 1100 HV 0.15 – 0.30 mm
H11 (1.2343) High-Toughness Dies 950 – 1100 HV 0.15 – 0.30 mm
DIN 1.2714 (L6) Heavy-Duty Forging Blocks 850 – 1000 HV 0.20 – 0.40 mm
Dievar (or Premium Cr-Mo-V) High-Volume / Critical Dies 1000 – 1150 HV 0.15 – 0.25 mm
Note: Forging dies are prone to "spalling" if the nitride layer becomes too brittle. Our plasma nitriding process is specifically tuned for forging to ensure a high-hardness surface with a gradual transition to the core, minimizing the risk of brittle fracture under heavy impact.