High-Performance Alligator Shear Blades: The Essential Guide for Metal Recyclers
In the scrap metal industry, your alligator shear blades are the frontline tools that define your processing speed and operational costs. Whether you are cutting steel bars, aluminum profiles, or copper pipes, the durability of your shear knives is the key to minimizing downtime.
Alligator shear blade technical specifications
Scrap metal shearing blades
Crocodile shear blades
| NO. | Product Name | Specification Dimensions (length x width x height/thickness) ） | Material | Remarks |
| 18 | Alligator Shear Blade dimensions
Scrap metal shearing blades dimensions | 600*80*30mm | H13,H13K | Customization services are available; we can manufacture according to your drawings, with a minimum order quantity of 1 piece. |
| 19 | 600*100*30mm |
| 20 | 800*120*40mm |
| 21 | 800*120*50mm |
| 22 | 1000*120*40mm |
| 23 | 1000*120*50 |
| 24 | 1200*120*40 |
| 25 | 1200*120*50 |
Common Material Overview of Alligator Shear Blades
The following table summarizes the type, core characteristics and main applicable shearing materials of common blade materials:
Blade Material | Material Type | Characteristics | Main Shearing Materials |
H13 (4Cr5MoSiV1) | Hot Work Die Steel | Excellent high temperature strength and thermal fatigue resistance | Hot-sheared hot rolled plate, iron plate, medium and thick plate, scrap metal, hot-sheared strip steel, cold-sheared high strength alloy steel, stainless steel thick plate |
LD (7Cr7Mo2V2Si) | Cold Work Die Steel | High strength, good toughness, wear resistance and chipping resistance, excellent comprehensive performance | High strength steel, stainless steel, thick plate and hard-to-shear metal materials (for large hydraulic shearing machines, heavy CNC shearing machines) |
Blade Material Selection Scheme
H13 (4Cr5MoSiV1) Hot Work Tool Steel
Performance
After heat treatment, its hardness reaches HRC52-55. It resists impact well. It also stands up to high temperatures without softening. It has strong core toughness and can be hardened evenly.
Suitable for
Alligator shears with a tonnage of ≥160T. It is mainly used to cut ultra-thick steel plates (≥30mm), high-hardness round steel, ordinary alloy steel, thick-walled welded pipes and other heavy materials.
Advantages
It is a common choice for heavy-impact work. It can effectively resist strong impacts during cutting. It prevents blades from chipping or breaking. It is adaptable and uses a mature production process.
H13K Modified H13 Hot Work Tool Steel
Performance
It is an upgraded version of H13. It keeps H13’s good impact resistance. It also improves core toughness, high-temperature stability and fatigue resistance. Its hardenability is better than ordinary H13.
Suitable for
Ultra-large alligator shears with a tonnage of ≥180T. It is mainly used to cut extra-thick steel plates (≥40mm), heavy alloy steel, thick-walled seamless pipes, large structural steel and other high-pressure, high-impact materials. It is also suitable for ultra-heavy continuous cutting in scrap yards.
Advantages
It resists strong impact and fatigue better than ordinary H13. Under ultra-heavy working conditions, its service life is 20%-30% longer than H13. It is the first choice for ultra-large alligator shears.
LD Steel (7Cr7Mo2V2Si) Cold Work Tool Steel
Performance
After heat treatment, its hardness reaches HRC60-64. Its surface wear resistance is much better than ordinary tool steel. It has high core toughness. The blade’s overall hardness is even. It resists abrasive wear very well.
Suitable for
Medium-to-large alligator shears with a tonnage of 100T-160T. It is mainly used to cut 10-30mm thick steel plates, thick rebar, rusty scrap steel, angle steel/channel steel and other highly abrasive common materials.
Advantages
It has the best wear resistance among the three materials. It greatly reduces how often blades need to be replaced. It improves the efficiency of large-scale production.
Strengthening Process
The performance of these three materials depends on precise heat treatment and surface strengthening. Even for the same material, different processing methods can make the blade’s service life differ by more than twice.
Basic Heat Treatment Process
1. Use vacuum heat treatment instead of ordinary air quenching. This reduces surface oxidation and decarburization of the blade. It ensures the blade’s overall hardness is even.
2. After quenching, immediately perform low-temperature tempering at 180-220℃. This eliminates internal stress. It prevents the blade from deforming or cracking. It also stabilizes the material’s core hardness and toughness.
Suggestions on Blade Material Selection
Alligator shear blades and scrap shear blades are usually made of H13 material. If the scrap composition is complex, we recommend H13K. If you have higher requirements, please contact the manufacturer to discuss material upgrading.
Blade Metal Materials International Grade Corresponding Table
China (GB) | USA(ASTM) | Japan (JIS) | Germany (DIN) | Germany (W-Nr) | France (NF) | Russia (ROCT) | U.K (BS) |
Cr12Mo1V1 | D2 | - | X155Cr12Mo12 | 1.2379 | X160CrMoV12 | - | BD |
4Cr5MoSiVI | H13 | SKD61 | X40CrMoV5-1 | 1.2344 | X40CrMoV5 | 4X5MO1C | BH13 |
LD | - | - | - | - | - | - | - |
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:
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.