Product introduction 

Die Steel Plate is a type of special steel plate used specifically for manufacturing various types of molds (such as stamping molds, injection molds, forging molds, etc.). Its core function is to meet the mold's key performance requirements such as hardness, wear resistance, toughness, and corrosion resistance during the forming process through specific composition design and heat treatment process, ensuring that the mold can stably produce high-precision, high-quality industrial parts or products in the long term.

Feature

1. High hardness and wear resistance: Mold cavities and cutting edges are subject to repeated contact with the industrial products. Insufficient wear resistance can lead to cavity wear and reduced dimensional accuracy (e.g., blunting of stamping mold cutting edges and scratching of injection mold cavities).

2. Sufficient toughness: This prevents mold cracking due to impact or uneven force (e.g., cold stamping molds subject to instantaneous impact, where insufficient toughness can lead to chipping of the cutting edge).

3. Good thermal stability: Hot-work molds (such as forging and die-casting molds) must maintain hardness and dimensional stability at temperatures between 200°C and 1000°C to avoid thermal deformation.

4. Excellent Processable: Mold manufacturing requires precision machining through milling, grinding, and electrical discharge machining (EDM). The steel must be easy to cut and polish, with low surface roughness after machining (especially for injection molds, which require a mirror-like surface finish).

5. Corrosion resistance (in some scenarios): When used in the manufacture of plastic molds, if processing plastics containing corrosive additives (such as PVC), the steel plate must be rust-resistant to prevent cavity corrosion from affecting product quality.

Divided by mold type

Processing and heat treatment of mold steel plates

1. Pretreatment (spheroidizing annealing): Reduces the hardness of the steel plate (for example, reducing the hardness of Cr12 from HB250 to below HB180) to facilitate subsequent milling, drilling, and other processes, while also preparing for subsequent quenching.

2. Precision Machining: Through processes such as CNC milling, electrical discharge machining (EDM), and wire cutting (WEDM), the steel plate is machined into complex shapes such as mold cavities and cutting edges, with an accuracy of up to 0.001mm.

3. Final Heat Treatment:

Cold work die steel: "Quenching + Low-Tempering" (e.g., Cr12MoV: quenching temperature 950-1050°C, tempering temperature 180-220°C) achieves high hardness and wear resistance.

Hot work die steel: "Quenching + Medium-Tempering" (e.g., H13: quenching temperature 1020-1050°C, tempering temperature 560-580°C) balances high-temperature hardness and toughness.

Plastic mold steel: "Pre-hardening" (e.g., P20: factory hardness reaches HRC 28-32), eliminating the need for subsequent quenching and preventing deformation after processing. Suitable for large molds.

4. Surface treatment (optional): such as nitriding (to improve surface hardness and wear resistance) and chrome plating (to enhance corrosion resistance and demoulding properties) to further extend the life of the mold.

Application areas

Automotive Industry: Body stampings (cold-work steel Cr12MoV molds), engine blocks (hot-work steel H13 die-casting molds), interior plastic parts (plastic steel P20 injection molds);

3C Industry: Mobile phone casings (S136 molds, mirror polish), circuit board stamping (DC53 molds, high-precision cutting edges);

Home Appliance Industry: Refrigerator door panel stamping (Cr12 molds), washing machine plastic parts (718H molds);

Hardware Industry: Screw and nut cold heading (cold-work steel molds), kitchenware forging (hot-work steel molds)