Application of Vacuum Gas Quenching Furnaces for 1.2343

1. Introduction to 1.2343 (AISI H11) Hot-Work Tool Steel

1.2343 is a high-quality chromium-molybdenum-vanadium alloy hot-work tool steel, internationally equivalent to the American AISI H11 grade. As a representative hot-work tool steel, its core advantage lies in its ability to operate stably for extended periods under high-temperature conditions.Utilizing a professional vacuum gas quenching furnace for 1.2343 is crucial to fully realizing these superior material properties.

2. Material Characteristics

• 1.High toughness and impact strength: Provides molds with exceptional resistance to chipping.
• 2.Outstanding thermal fatigue resistance: Withstands temperature stresses from repeated heating and cooling cycles, effectively extending mold life.
• 3.Good high-temperature strength and hardenability.

3. Why Vacuum Heat Treatment Is Required for 1.2343？

To achieve the full potential of this high-performance mold steel, vacuum quenching and tempering are not just options—they are essential processes. Standard heat treatment often falls short because 1.2343 (AISI H11) is extremely sensitive to surface chemistry and thermal stress.

• Total Surface Protection: 1.2343 contains high levels of chromium and molybdenum. Conventional heating causes rapid decarburization and oxidation, creating a “soft skin” that leads to premature mold failure. Vacuum processing ensures the surface remains bright, clean, and at full hardness.
• Controlled 15-Bar Cooling: To transform the thick sections of a 1.2343 mold into tough martensite, a high cooling rate is mandatory. Modern vacuum furnaces allow for high-pressure gas quenching (up to 15 bar), which provides the necessary “deep hardening” without the risk of cracking associated with liquid oil quenching.
• Precision for Complex Geometries: 1.2343 is typically used for intricate die-casting molds. Vacuum heating is more uniform, and by precisely controlling the heating and cooling cycles, thermal distortion is minimized, saving significant costs on post-process grinding and CNC finishing.

4. Vacuum Gas Quenching Furnace for 1.2343

The following outlines the vacuum heat treatment procedure for 1.2343.

1.Primary Preheating: Heat to 600°C to 650°C and hold in vacuum or nitrogen atmosphere (stress relief).

2.Secondary preheating: Raise temperature to 800°C to 850°C and maintain holding time (for temperature homogenization).

3.Austenitizing heating: Raise temperature to 1000°C to 1040°C and hold for 30-60 minutes under high vacuum (approximately 10⁻³ Pa).

4.Vacuum Quenching: Rapidly cool while injecting high-purity nitrogen (N₂) at 2 bar to 10 bar.

5.Final Cooling: Must be continuously cooled to room temperature (below 50°C) to ensure complete martensitic transformation.

First tempering: Hold at 550°C to 620°C for over 1 hour (stress relief).

6.Intermediate cooling: Fully cool the workpiece to room temperature again (critical step to ensure residual austenite transformation).

7.Second tempering: Hold at the same temperature as the first tempering for over 1 hour (achieve final properties and toughness).

5. Technical Specifications

The following are the technical parameters for the vacuum gas quenching furnace used in the vacuum gas quenching and tempering of 1.2343 :

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