The performance differences between 3Cr-H13 steel (with Chromium content reduced to 3%) and traditional H13 steel (with 5% Cr content) were compared. Microstructural and phase composition analyses were conducted using SEM, TEM, and XRD to investigate the influence of Chromium on the properties of H13 steel. The results indicate that reducing Cr content significantly improves the tempering stability and high-temperature strength of H13 steel. This improvement is primarily attributed to the degree of martensite recovery in the tempered structure and the specific types of secondary carbide precipitation.Traditional H13 Steel: When tempered at 650°C, the martensite undergoes nearly complete recovery, leading to a significant drop in matrix strength. Large quantities of near-spherical Cr7C3 and M6C carbides precipitate along the original martensitic lath and grain boundaries, weakening the secondary phase hardening effect.3Cr-H13 Steel: After tempering at 650°C, the matrix retains its lath martensite structure with a high dislocation density. Simultaneously, a large volume of fine, dispersed, short-rod-shaped VC (Vanadium Carbides) precipitates within the laths. These carbides provide dispersion strengthening and pin the dislocations, delaying martensite recovery and thereby enhancing high-temperature performance.These blades are ideally suited for hot shearing of medium-to-thick plates and billets in steel mills. Licheng knife: Tailor-made, cost-effective solutions with one-on-one specialized service for every client!

51CrV4 is an alloy spring steel commonly used to manufacture large-scale shear blades due to its high cost-effectiveness. However, oxidation and decarburization during hot forging and heat treatment can severely impact quenching hardness, lead to quenching cracks, and reduce durability. To mitigate these issues, it is recommended to: Increase machining allowance appropriately during blanking and forging. Utilize a lower softening temperature post-forging as a substitute for standard annealing. Extend preheating time while shortening the holding time at the quenching temperature for large-scale blades. Apply protective coatings prior to quenching to prevent surface damage. Licheng knife: Quality stems from every overlooked detail!

In 2026, Nanjing officially introduced a "Spring Break" policy for primary, secondary, and higher education, linking the first week of April into a six-day extended holiday. This is more than just a break from academics; it is an invitation from the ancient city of Jinling to witness the peak of spring. At this moment, the "Spring at Niushou Mountain" is a tapestry of lush greenery, and the cherry blossoms at Jiming Temple drift like fallen snow. Strolling along the banks of Xuanwu Lake, tender willow branches brush the water while the purple peaks of the Zhongshan Mountains reflect in the ripples. This rare spring break allows people to step away from the rigorous pulse of industry to touch the profound history of the Stone Elephant Road or savor the seasonal sweetness of a qingtuan (green rice ball) in the alleys of Laomendong. "To do a good job, one must first sharpen one's tools." While study and manufacturing require precise edges, life requires an occasional "blank canvas." These six days of spring break serve as the perfect whetstone for the soul, allowing us to recharge our strength amidst the fragrance of flowers and the wisdom of books.

The design of the hydraulic swing beam shear inherently possesses several structural deficiencies: Linearity & Deformation: The blade carrier itself is arc-shaped, relying on arc-point contact to maintain the straightness of the sheared material. However, the force application point on the carrier and the cutting force on the blade are not aligned and are separated by a significant distance. Over long-term operation, this makes the carrier susceptible to fatigue and deformation, leading to severe "blade deflection" and resulting in burred edges on the cut. Mechanical Play: The bearing connection between the swing arm and the frame body typically has excessive clearance, often exceeding 0.10mm. Efficiency & Versatility: The shearing angle is fixed and non-adjustable, meaning the machine operates the same way for both thick and thin plates, which is both time-consuming and energy-inefficient. Material Distortion: The diamond-shaped blade design tends to cause "twisting" or "spiraling" of the sheared material; the narrower the workpiece, the more severe the distortion. Conclusion: "To do a good job, one must first sharpen one's tools." Selecting a high-quality shearing machine is the only way to push the performance of premium shear blades to their absolute limit.

Gantry shear blades operate under severe conditions and endure significant stress, necessitating large design dimensions—typically with a thickness of ≥40mm.In the current market, where competitive bidding is often disorganized, some manufacturers attempt to reduce costs by using 55SiCr flat steel. However, as thickness increases, the rolling force struggles to penetrate the core of the flat steel. This results in minimal plastic deformation at the center, leaving metallurgical defects—such as gas pockets, inclusions, and porosity—unresolved. Consequently, the mechanical properties of the blades are substantially compromised.

A common question from our detail-oriented clients is: "Why do you apply this coating to the shear blades before quenching?" To put it simply: Because shear blades come in various sizes and are often produced in custom quantities, they are best suited for heating in a box-type furnace. However, the main drawback of these furnaces is that they cannot isolate the workpiece from the air. When a blade is heated while exposed to oxygen, oxidative decarburization occurs—meaning the carbon content on the blade's surface decreases. This negatively impacts the surface quality after quenching. If this decarburization layer is too deep to be fully removed during finishing, it can become a fatigue source, leading to cracks or failure. By applying this specialized anti-oxidation and anti-decarburization coating and drying it before heating, we create a protective barrier that effectively preserves the steel's integrity. Licheng knife: We care about every detail.

H13 Blade Material Variations 1.Non-standard H13 (Substandard/Scrap-based): Produced from scrap steel (Ditiao steel) without adhering to formal chemical or quality standards. 2.Standard H13 (Scrap-based): Scrap-based steel that claims to meet the basic GB (National Standard) chemical composition but lacks purity. 3.ESR H13 (Scrap-based): Scrap-based H13 that has undergone Electroslag Remelting (ESR) to improve cleanliness, though the base material remains inferior. 4.Standard GB H13 (National Standard): Conventional H13 tool steel manufactured by reputable mills following the Chinese National Standard (GB/T 1299). 5.ESR H13 (Electroslag Remelted): High-quality H13 produced via the ESR process, resulting in improved isotropic properties and reduced impurities. 6.Ultra-refined ESR H13: Premium ESR H13 that has undergone specialized processing (such as your mentioned forging and heat treatment) to achieve an ultra-fine grain structure. 7.PESR H13 (Pressure/Protective Atmosphere ESR): The highest tier; H13 produced via Electroslag Remelting under a Protective Atmosphere, preventing oxidation and ensuring maximum material purity and toughness. Our company specializes in the manufacture of high performance guillotine shear blades. We offer a wide range of premium materials tailored to your specific needs. Please feel free to contact us for inquiries.

510L shearing blade is currently a high-end steel product used for automotive longitudinal beams. Its chemical composition consists of C ≤ 0.20%, Mn 1%–1.6%, and Si ≤ 0.55%, with a tensile strength ranging from 510–630 MPa. Due to the material's properties, shearing blades must meet exceptionally high standards for both toughness and strength. Common failure modes for these blades include plastic deformation (slumping), abrasive wear, and cracking, leading to extremely high blade consumption rates. To address these challenges, our company utilizes custom-ordered low-carbon (C ≤ 0.38%) ESR (Electroslag Remelting) ultra-refined H13 raw materials from leading steel mills. Our specialized process includes: Precision Forging Spheroidizing Annealing Oil Quenching at 1040°C Four or more cycles of thorough tempering Field testing by end-users confirms that the steel-shearing volume per blade has more than doubled. This achievement has delivered significant economic benefits, contributing tangibly to cost reduction and efficiency for our customers.