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.

Using a reasonable heat treatment process for H13 medium-to-heavy plate shear blades can provide the necessary mechanical properties and significantly extend their service life. However, if heat treatment defects occur due to improper process design or operational errors, the blade's load-bearing capacity will be severely compromised. This leads to premature failure and a shortened lifespan. Common heat treatment defects include overheating, burning, decarburization, cracking, uneven hardened layers, and insufficient hardness. After H13 steel blades have been in service for a certain period and internal stresses have accumulated to a critical limit, a stress-relief tempering process should be performed. Failure to do so may result in cracking caused by these internal stresses during continued service.

The roughness of the shear blade has a great impact on the blade's precision and durability. The ground surface of the blade is actually formed by countless grooves engraved by numerous abrasive grains on the grinding wheel. The quenched HRC60° CCr12MoV cutting edge uses an 80-grit medium-soft K-grade white corundum grinding wheel. By maximizing the grinding wheel's linear speed and moderately reducing the blade workpiece's linear speed and longitudinal feed rate, a surface quality with better roughness can be achieved! Licheng knife, excellence comes from every detail!

Pre-Quenching Preparation for Shearing Blades: Cleaning: Thoroughly remove all residual cutting fluids and tapping oils from drilled and tapped holes. Coating: Air-dry the blades and apply a specialized anti-oxidation and anti-decarburization coating. Drying: Place in a drying oven at a constant temperature of 60°C for 2 hours. Plugging: After removal from the oven, use asbestos or refractory clay to plug all through-holes and blind-tapped holes. Lichen Blades: It is these meticulous details that forge the superior quality of our cutting edges!

9CrSi remains a dominant choice in the shearing machine market and among end-users due to its exceptional cost-performance ratio. However, 9CrSi is highly sensitive to overheating during the quenching process. If the surface carbon content drops to 0.6%–0.7% due to decarburization, the shearing blade may still achieve a surface hardness of HRC 60–62, but its flexural strength (bending strength) will plummet by 40%–50%. To address this, Licheng Knife has implemented a specialized "Zero-Holding Time Quenching & Toughening" process based on extensive experimental data. By minimizing the residence time of the blades in the heating furnace, we significantly reduce oxidation and surface decarburization.