Phone:
86-15852949220
NANJING ALAS INTERNATIONAL CO., LTD
Views: 55 Author: Site Editor Publish Time: 2025-02-12 Origin: Site
The cutting conditions of alligator shear blades & Scrap Metal Shear Blades involve both high impact loads and wear resistance. The core material selection must balance high surface hardness, wear resistance, and core impact toughness to prevent chipping, breakage, or premature wear of the blades.
The blade material requires vacuum quenching to ensure uniform overall hardness and guarantee resistance to abrasive wear; the core must possess excellent impact toughness to withstand the instantaneous strong loads during shearing; it must also have good hardenability to ensure uniform overall hardness of the blade, preventing premature failure due to localized soft areas, and be suitable for precision machining and subsequent edge strengthening of the blade.
The material must be matched to the equipment tonnage and the specifications of the material being sheared (thickness/hardness). The selection should be based on the material's performance characteristics and the specific shearing environment to avoid waste or blade damage due to improper material selection.
Performance: Hardness of HRC52-55 after quenching and tempering, outstanding resistance to impact loads, excellent high-temperature softening resistance, excellent core toughness, and good hardenability;
Suitable for alligator shears with a tonnage of ≥160T, primarily for shearing ultra-thick steel plates (≥30mm), high-hardness round steel, ordinary alloy steel materials, thick-walled welded pipes, and other heavy materials.
Advantages: A general choice for heavy-duty impact conditions, effectively resisting strong impacts during shearing, preventing blade chipping and breakage, strong adaptability, and mature process.
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.
Performance: Hardness of HRC60-64 after quenching and tempering, surface wear resistance far superior to conventional tool steel, high core toughness, good overall hardness uniformity of the blade, and outstanding resistance to abrasive wear;
Suitable for 100T-160T medium-to-large tonnage alligator shears, primarily for shearing 10-30mm thick steel plates, thick rebar, rusty scrap steel, angle steel/channel steel, and other highly abrasive conventional materials.
Advantages: The best wear resistance among the four materials, significantly reducing the frequency of blade replacement and improving the efficiency of large-scale production.
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.
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.
