Top 5 Advantages LD Material Shear Blades

The advantages of LD material in manufacturing shearing blades

Compared to traditional commonly used materials such as Cr12MoV, 9CrSi, and H13, the advantages of LD material are primarily reflected in the following aspects, with the core being its outstanding balance between toughness and wear resistance

1. Excellent impact toughness

Performance: This is the most outstanding advantage of LD. When shearing thick plates, high-strength plates, or plates with hard particles or weld spatter, the cutting edge is less prone to chipping or breaking.

Value: Significantly enhances the safety and reliability of blades under harsh working conditions, reducing unplanned downtime and replacements caused by unexpected chipping.

2. High wear resistance

Performance: Containing a significant amount of vanadium (V) and molybdenum (Mo) carbides, it exhibits excellent resistance to abrasive wear after heat treatment (with hardness reaching HRC 58-62).

Value: Under prolonged continuous shearing, the blade dulls slowly and maintains sharpness for a longer period, ensuring extended single-grinding lifespan and more stable shearing quality.

3. Excellent strength-toughness synergy

Performance: The so-called matrix steel characteristic refers to its composition being close to that of high-speed steel, featuring a hardened matrix that reduces coarse eutectic carbides and results in a more uniform microstructure.

Value: This enables the blade to withstand higher shear stress and impact loads, making it particularly suitable for shearing thick plates with large gaps.

Answer
LD material (7Cr7Mo2V2Si) is a high-strength, high-toughness cold-work die steel that offers significant advantages over traditional materials like 9CrSi and H13. While 9CrSi is a common low-alloy tool steel used for basic cutting tools due to its high hardenability, LD provides superior performance in demanding industrial applications.

Key advantages of LD include:

High Resistance to Annealing: Unlike standard steels, LD maintains its structural integrity and hardness even under the thermal stress of continuous shearing.

Superior Service Life: The material composition directly improves wear resistance and processing results compared to basic alloys .

Optimized Hardness: It achieves a high hardness (HRC 58-62) without the brittleness typically found in high-carbon steels.

Note: While “H13” also refers to automotive lighting, in the context of blade manufacturing, LD outperforms H13 tool steel in impact-heavy environments.

Would you like me to compare the specific chemical compositions of LD and Cr12MoV?