Scrap Metal Shear Blades

Scrap Metal Shear Blades technical specifications

Alligator Shear Blade

Common Material Overview of Scrap Metal Shear Blades

The following table summarizes the type, core characteristics and main applicable shearing materials of common blade materials:

Detailed Characteristics of Various Blade Materials

H13 (4Cr5MoSiV1) Hot Work Die Steel

Characteristics: Excellent high temperature strength, impact toughness and thermal fatigue resistance, can maintain good hardness and shearing performance in high temperature environment, not easy to soften and deform;

Hardness: HRC 50-55 (after heat treatment);

Applicable to: Hot shearing strip steel, hot shearing thick plate, cold shearing high strength alloy steel and stainless steel thick plate.

H13K Modified H13 Hot Work Tool Steel

Performance: An upgraded and modified version of H13, retaining the excellent impact resistance of H13 while improving core toughness, high-temperature stability, and fatigue resistance.  Hardenability is superior to conventional H13;

Suitable for ≥180T ultra-large tonnage alligator shears, primarily for shearing extra-thick steel plates (≥40mm), heavy alloy steel materials, thick-walled seamless pipes, large structural steel, and other ultra-high pressure and high-impact materials, as well as ultra-heavy continuous shearing operations in scrap metal yards;

Advantages: More resistant to strong impact and fatigue than conventional H13, with a 20%-30% longer service life than H13 under ultra-heavy working conditions, making it the preferred material for ultra-large alligator shears.

LD (7Cr7Mo2V2Si) Cold Work Die Steel

Characteristics: A high-performance cold work die steel with high strength and excellent toughness. Its contained V (vanadium) and Mo (molybdenum) significantly refine the grain, giving it extremely high bending strength and toughness, better wear resistance, and extremely strong chipping resistance;

Hardness: HRC 58-62 (after heat treatment);

Applicable to: Shearing high strength steel, thick plate, stainless steel and various hard-to-shear metal materials, commonly used for blades of large hydraulic shearing machines and heavy CNC shearing machines.

Strengthening Process

The performance of the four materials depends on precise heat treatment and surface strengthening.  Differences in processing can lead to more than a 2-fold difference in blade service life for the same material.

Basic Heat Treatment Process

1. Vacuum heat treatment is used instead of ordinary air quenching to reduce surface oxidation and decarburization of the blade, ensuring overall hardness uniformity;

2. Low-temperature tempering at 180-220℃ is performed immediately after quenching to eliminate internal stress, prevent blade deformation and cracking, and stabilize the core hardness and toughness of the material.

Suggestions on blade material selection

Crocodile shear blades and scrap shear blades are typically made of H13 material. For complex scrap compositions, H13K is recommended. For even higher requirements, please contact the manufacturer to discuss upgrading the material.

Blade Metal Materials International Grade Corresponding Table

Mechanical blades are (special wearing parts) due to different cutting products, correct and reasonable selection of materials, heat treatment hardness, grinding accuracy, packaging requirements. Please contact us before purchase and confirm whether the blade specifications materials you need are available goods.

^{Our quality: All mechanical parts, tools, and molds are manufactured in-house. Upon arrival at our warehouse, products undergo rigorous inspection by a dedicated quality control department. The following is our production process:}        

<sup>1. Blanking-choose materials according to customer requirements.
2. Forging-Forging is mainly to increase the density of the material.
3 .Annealing-to lower the temperature for processing.
4 .Finishing ---- mainly processing materials.
5 .Inspection ---- Inspect whether the product is consistent with the drawing sample.
6.Quenching ---- Improve the hardness of molded products and materials.
7 .Annealing-In order to increase the wear resistance of the product, it must be annealed for a long time to prevent the blade from breaking
8 .Tempering-mainly the parallelism of the tempering products for processing.
9 .Rough grinding ---- rough grinding the surface of the product.
10.Precision grinding ---- Super-precision grinding and mirror grinding to improve the accuracy and parallelism of the product.
11. Inspection-Let unqualified products refuse to flow into the market.
12 .Packing ---- Pack differently according to different products.</sup>