Phone:
86-15852949220
NANJING ALAS INTERNATIONAL CO., LTD
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Nanjing, China
T/T, Money Gram
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Cut structural steel (channel steel, I-beam, H-beam)
Process end-of-life vehicles (dismantle frames, bearings, wheels)
Demolish steel structure workshops and bridge frames
Cut thick-walled steel pipes and waste cables
Cut large scrap into furnace-sized pieces to boost loading efficiency
Hardness: HRC50-55 after heat treatment
Good impact resistance and high-temperature stability
Strong core toughness and easy to harden
Alligator shears (≥160T)
Cutting thick steel plates , round steel, alloy steel, thick-walled welded pipes
Double-cylinder scrap shear blades, hydraulic excavator shear blades, mobile scrap shear knives
Steel plate cutting blades for recycling
Ideal for heavy-impact work
Prevents blade chipping and breaking
Versatile and easy to process
Upgraded from H13
Keeps H13’s impact resistance, better core toughness and fatigue resistance
Easier to harden than standard H13
Ultra-large alligator shears (≥180T)
Cutting extra-thick steel plates, heavy alloy steel, thick-walled seamless pipes
Double-cylinder scrap shear blades, hydraulic excavator shear blades (harsh conditions)
Mobile scrap shear knives (heavy continuous work), high-demand steel plate cutting blades
More impact and fatigue resistant than H13
20%-30% longer service life than H13 (heavy work)
Best choice for ultra-large shears and high-demand blades
Hardness: HRC60-64 after heat treatment
Much better wear resistance than regular tool steel
Uniform hardness and good core toughness
Medium-large alligator shears (100T-160T)
Cutting 10-30mm steel plates, rebar, rusty scrap, angle steel
Double-cylinder scrap shear blades, hydraulic excavator shear blades, mobile scrap shear knives (abrasive materials)
Steel plate cutting blades for recycling (abrasive conditions)
Best wear resistance among the three materials
Reduces blade replacement frequency
Cost-effective for abrasive work
Vacuum heat treatment (instead of air quenching): Reduces surface damage, ensures uniform hardness for all three materials.
Low-temperature tempering (180-220℃): Eliminates internal stress, prevents deformation/cracking, stabilizes hardness and toughness.
General use: H13 (most common and reliable)
Complex scrap/heavy work: H13K (longer life, better fatigue resistance)
Abrasive materials: LD steel (best wear resistance)
For higher needs: Contact the manufacturer for material upgrades
Hydraulic scrap shear knives
Hydraulic excavator shear blades, demolition shear blades, hydraulic scissors blades
Mobile scrap shear knives, steel plate cutting blades for recycling
Core components: Upper/lower primary/secondary blades, piercing tips, guide blade, cross blade
Scrap demolition has unpredictable forces.
H13/H13K have good fracture toughness: They bend slightly instead of shattering.
H13/H13K = better impact resistance; LD steel = better wear resistance (for low-impact, abrasive work).
Heat treatment balances hardness and toughness.
H13/H13K: HRC52-56; LD steel: HRC60-64.
Without proper heat treatment, blades may chip or fracture.
Double-cylinder shears need perfect jaw alignment.
CNC grinding ensures a tight fit, reducing bolt wear.
H13/H13K/LD steel have stable dimensions for consistent performance.
All blades have 4 usable edges.
Rotating blades quadruples their service life.
Saves cost per cut in recycling operations.
We use high-performance alloy steels: H13 (basic), H13K (upgraded), LD (wear-resistant).
Precise heat treatment balances hardness and toughness, preventing chipping and deformation.
Our blades withstand impact and abrasion, reducing maintenance costs.
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) |
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.
Nanjing Alas International Co., Ltd. is a professional industrial tooling manufacturer focused on shear blades, bending dies, shredder blades, and custom wear parts. We offer full application engineering, material selection, setup guidance, and after-sales support to global customers.
Tell us your requirements, and our engineering team will provide professional solutions for blade specification, tool life optimization, and cost-effective production.