7Cr7Mo2V2Si Tool Steel
7Cr7Mo2V2Si tool steel is a high-strength cold work tool steel with excellent toughness, wear resistance, fatigue strength, and stable heat treatment performance. It is widely used for cold extrusion dies, cold heading dies, cold stamping dies, and other tooling applications that require long service life, strong impact resistance, and reliable dimensional performance under heavy-load and high-frequency working conditions.
Product Description
Xiri Tool Steel is a leading supplier of 7Cr7Mo2V2Si tool steel in China. 7Cr7Mo2V2Si (designated as LD) is a high-strength and high-toughness cold working die steel independently developed by China. By optimizing the alloy ratio, it significantly enhances toughness while maintaining high hardness and wear resistance. Its performance is superior to that of traditional Cr12 type die steel. This steel type is particularly suitable for cold extrusion, cold heading and cold stamping dies that bear high impact loads. In practical applications, the service life of the molds can be increased by several times to over ten times compared to traditional materials (such as Cr12MoV).
Whether you need 7Cr7Mo2V2Si flat bars, steel plates, or forged rounds, we provide custom dimensions with machining or grinding services. Our materials are strictly tested to ensure premium metallurgical structure.
7Cr7Mo2V2Si steel represents the culmination of Chinese materials engineers’ expertise, being a high-strength, high-toughness, high-wear-resistance cold work tool steel.
Chemical Composition of 7Cr7Mo2V2Si tool steel
| C | Si | Mn | P | S | Cr | Mo | V |
| 0.70-0.80 | 0.70-1.20 | ≤0.50 | ≤0.030 | ≤0.030 | 6.70-7.50 | 2.00-2.50 | 1.70-2.20 |
Supply Form & Size Range of 7Cr7Mo2V2Si tool steel
We supply 7Cr7Mo2V2Si steel in various forms to meet your manufacturing needs:
Round bar: Diameter 16mm – 500mm
Steel Plate / Flat: Thickness 16mm – 450mm x Width 200mm – 810mm
Surface: Black, Peeled, Rough machined or Grinded.
Delivery Condition: Annealed (Hardness 255 HB max.)
Core Performance of 7Cr7Mo2V2Si Tool Steel
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Exceptional Strength-Toughness Combination – Eliminating the Pain of Unexpected Fractures
This stands as 7Cr7Mo2V2Si’s most celebrated characteristic. Compared to the more brittle Cr12MoV, its impact toughness is enhanced severalfold. In complex moulds subjected to high-intensity impacts, eccentric loading, or stress concentration (such as slender punches and precision blanking dies), it effectively prevents brittle fracture and chipping, significantly boosting production safety and stability.
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Exceptional Wear Resistance — Extended Service Life, Reduced Replacement Frequency
Benefiting from the uniformly dispersed hard carbides formed by vanadium, 7Cr7Mo2V2Si’s wear resistance rivals or even surpasses certain high-speed steels. After hundreds of thousands or even millions of continuous stamping, drawing, and forming operations, the mould cavities and cutting edges remain intact with minimal dimensional deviation, delivering extended mould life and consistent product quality.
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Superior Fatigue Strength — Withstands Cyclic Loading and Endures Long-Term Stress
Under alternating stresses, materials are prone to fatigue crack initiation and propagation. The pure matrix structure and refined grain size of 7Cr7Mo2V2Si confer exceptional fatigue resistance, effectively delaying the initiation and propagation of fatigue cracks. This makes it particularly suitable for high-frequency, long-cycle production conditions, serving as a reliable foundation for achieving automated, large-scale manufacturing.
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Superior Processability — Broad heat treatment tolerance and ease of machining
This steel grade offers a wide quenching temperature range with relatively low tendency for heat treatment distortion, providing greater convenience during mould fabrication and modification. Its excellent machinability and grindability also reduce manufacturing complexity and costs.
Application Domains of 7Cr7Mo2V2Si | Your Industry is Its Stage
Leveraging its comprehensive performance advantages, 7Cr7Mo2V2Si has become the preferred material across numerous industries to replace traditional cold work tool steels, particularly suited for:
Precision Stamping and Cutting Dies: Applications demanding exceptional edge sharpness, such as motor silicon steel sheets, electronic connectors, and lead frames.
Cold heading and cold extrusion dies: Forming punches and dies for standard fasteners (bolts, nuts, pins) and complex irregular components.
Drawing and forming dies: Deep drawing and bending dies for automotive components, appliance housings, and similar products.
Die-casting mould bases and accessories: Superior to conventional medium-carbon steels for high-toughness applications such as mould bases, slides, and ejector pins.
If you are troubled by premature mould failure, or if you pursue ultimate production efficiency and lower unit costs, then 7Cr7Mo2V2Si is the solution you seek.
Our advantages in Processing 7Cr7Mo2V2Si Tool Steel
We understand that exceptional steel relies not only on outstanding chemical composition design but also on comprehensive quality control throughout the entire process, from smelting to delivery. We pledge that every piece of 7Cr7Mo2V2Si steel you receive embodies our unwavering commitment and craftsmanship:
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Ultra-Pure Smelting Technology
Our advanced triple-process approach—Electric Arc Furnace (EAF) + Ladle Refining (LF) + Vacuum Degassing (VD)—minimises harmful gases (oxygen, hydrogen) and inclusions in the steel. Pure molten steel is the fundamental prerequisite for achieving high toughness and fatigue strength.
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Precision Forging and Rolling Control
Through computer-controlled high-speed forging presses and precision rolling mills, we ensure ingots undergo forging and rolling within the optimal temperature-deformation range. This thoroughly breaks down cast structures, refines carbides, forms dense, uniform flow lines, and eliminates internal defects.
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Uniform Spheroidising Annealing
Our rigorously optimised spheroidising annealing process guarantees delivered steel exhibits a uniform, fine-grained pearlite structure with moderate hardness (approximately HB 210-240). This provides an ideal foundation for subsequent machining and final heat treatment while ensuring exceptional mirror polishing performance.
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Comprehensive Non-Destructive Testing
Every steel component undergoes ultrasonic testing prior to dispatch to verify freedom from critical internal defects such as cracks, white spots, or shrinkage cavities. We additionally provide precise dimensional tolerance checks and rigorous surface quality inspections, enabling immediate production deployment without concern.
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Expert Technical Support and Service
We are not merely material suppliers but your technical partners. Our seasoned technical team provides heat treatment process recommendations for 7Cr7Mo2V2Si (including quenching temperatures and tempering curve design) alongside application support, helping you unlock the material’s full potential.
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Why Manufacturers Choose Huangshi Xiri
Huangshi Xiri combines international-standard steel grades, a complete tool steel portfolio, strict quality control and reliable global supply. We match DIN / JIS / AISI equivalents precisely, offer cutting and heat-treatment services, and control every step from smelting to inspection. With stable capacity, on-time delivery and responsive technical support, we help manufacturers reduce risk, save costs and run production with confidence.
Contact Us
Contact Huangshi Xiri today for quotations, grade selection and technical support on tool steel, mold steel and alloy steel. Whether you need samples, cutting-to-size service or long-term supply for your projects, our engineers and sales team are ready to respond quickly with professional advice and reliable solutions for your manufacturing needs.
