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5CrNiMo
5CrNiMo is a classic hot work die steel belonging to the alloy tool steel category. With its excellent thermal strength, toughness, and hardenability, it is widely used in medium and high-temperature die manufacturing. This product is produced using high-quality scrap steel and alloy raw materials through processes including electric arc furnace smelting, electroslag remelting refinement, and forging. The precise chemical composition and strict control of impurity content ensure a uniform, dense internal structure and fine-grained morphology. Its core features are distinct: outstanding thermal stability and resistance to thermal fatigue, maintaining consistent hardness and strength even at 500-600°C, effectively resisting crack damage caused by thermal cycling; high hardenability enables uniform quenched structures in thicker sections, with minimal hardness variation between the core and surface of large dies; balanced toughness and plasticity allow it to withstand high-temperature impact loads, preventing die fractures; combined with good machinability and polishing properties, it meets the manufacturing requirements for complex-shaped hot work dies. Whether for hot forging, hot extrusion, die casting, or hot forming, 5CrNiMo delivers stable high-temperature performance, providing reliable assurance for hot processing production. It is an indispensable high-quality hot work die steel material in industrial manufacturing.
The 5CrNiMo products showcased here cover a wide range of specifications and models, designed to meet diverse processing and application requirements for hot working dies. The specific models and detailed parameters are as follows:
- Plate specifications: 5CrNiMo-δ (thickness) × W (width) × L (length), with thickness ranging from 5mm to 300mm, widths available in 1000mm, 1220mm, or 1500mm, and standard lengths of 2000mm or 2500mm, customizable as needed. The plates are formed through hot rolling or forging, with surface treatments including black skin, annealed state, or rough machining, meeting the processing requirements of various hot work dies.
- Round steel specifications: 5CrNiMo-Φ (diameter) × L (length), with diameters ranging from 10mm to 500mm and standard lengths of 6000mm. Customized cutting is available upon request. Precision grades include standard (±0.5mm) and high-precision (±0.1mm), meeting diverse requirements for precision hot work die components.
- Module/Forged Part Specifications: 5CrNiMo alloy, dimensions from 100×100×100mm to 800×800×800mm, with customization for large irregular forgings. The module features refined grain structure through forging, resulting in dense internal microstructure with enhanced thermal strength and toughness, making it ideal for processing large-scale hot forging dies, hot extrusion dies, and other integral molds.
- Material specifications: 5CrNiMo steel (including square and flat steel). Square steel available in sizes 50mm×50mm to 300mm×300mm, flat steel in 20mm×50mm to 50mm×300mm. Customizable length. The annealed surface meets requirements for manufacturing hot working die auxiliary components (e.g., die frames, guide columns).
- Compliance standard: GB/T 1299-2014 (National Standard), equivalent to the international standard ISO 4957 55NiCrMoV6, ensuring product quality meets industry specifications. Material certificates, heat treatment reports, and test reports are available upon request.
- Chemical composition (mass percentage,%): C 0.50-0.60, Si 0.25-0.60, Mn 0.50-0.80, P ≤0.030, S ≤0.030, Cr 0.50-0.80, Ni 1.40-1.80, Mo 0.20-0.30. The precise composition ratio endows the steel with excellent thermal strength, toughness, and thermal fatigue resistance, which is a key guarantee for its core high-temperature performance.
- Heat treatment parameters: Anneal at 780-820°C for 3-5 hours with furnace cooling, achieving hardness ≤241HBW. Quench at 830-860°C with oil or air cooling, reaching HRC52-56. Temper at 480-520°C for 2-4 hours with air cooling to room temperature, stabilizing hardness at HRC40-45 (suitable for high-temperature hot work dies). The process can be customized according to die dimensions and operational requirements.
The 5CrNiMo products feature a regular appearance with no visible defects: The surfaces of plates and modules are smooth, free from cracks, inclusions, porosity, shrinkage cavities, or other imperfections. The forging marks are uniform, edges are smooth without burrs, and cutting surfaces are well-aligned. Dimensional accuracy is strictly controlled, with deviations within industry-accepted limits. Round bars and profiles exhibit uniform surface coloration without oxide scale accumulation, demonstrating excellent consistency in diameter and cross-sectional dimensions without noticeable bending or deformation. The overall appearance showcases superior forging and refining quality, making them ready for direct use in subsequent mold processing.
Metallographic analysis reveals that the annealed 5CrNiMo steel exhibits a microstructure of spherical pearlite with dispersed carbides, featuring uniformly fine grains averaging 7-8 microns, which facilitates machining. After quenching and tempering, the microstructure transforms into tempered sorbite with minimal carbide precipitation, demonstrating uniform and fine distribution without significant agglomeration. This significantly enhances the material's thermal stability and thermal fatigue resistance. Through electroslag remelting and forging processes, the steel achieves complete impurity removal, with defects like shrinkage cavities, porosity, and segregation occurring at extremely low rates. The density exceeds 99.8%, ensuring structural integrity under prolonged high-temperature thermal cycling without fracture failure, thereby guaranteeing stable operation and extended service life for hot working dies.
- Hardness: The annealed state hardness is ≤241 HBW, facilitating mechanical processing; after quenching and tempering, the hardness stabilizes at HRC40-45, and remains above HRC38 at 500-600°C, effectively resisting high-temperature friction and wear, thereby extending the service life of hot work dies.
- Mechanical properties (tempered): tensile strength ≥980MPa, yield strength ≥785MPa, elongation δ5≥10%, impact toughness αk≥60J/cm² (at room temperature). Even at high temperatures (550℃), the impact toughness remains above 30J/cm², demonstrating excellent strength-toughness balance. This enables the material to withstand high-temperature impact loads and prevents mold brittleness.
- Thermal fatigue resistance: After 500 thermal cycling cycles (20°C-600°C), the surface shows no visible thermal cracks. This performance surpasses conventional hot work die steel, effectively resisting repeated heating and cooling during hot processing to minimize thermal cracking failures.
- Hardening capability: The core maintains hardness above HRC45 after quenching at a 200mm thickness. Oil cooling alone suffices for quenching, eliminating complex cooling equipment. This simplifies heat treatment for large hot work dies, reduces production costs, and accommodates diverse die heat treatment requirements.
Using high-purity alloy materials and a dual-refining process combining electric arc furnace smelting with electroslag remelting, we rigorously control chemical composition and impurity levels to ensure stable and reliable steel quality. The steel is then forged to refine grain structure, enhancing internal density. This approach eliminates the risk of mold failure caused by material defects at the source, providing a solid foundation for the processing and long-term high-temperature operation of hot work dies.
This material demonstrates exceptional high-temperature performance with outstanding thermal stability and thermal fatigue resistance, enabling long-term stable operation at 500-600°C while resisting thermal cycling damage. It achieves a balanced combination of high-temperature strength and toughness, capable of withstanding both thermal shock loads and high-temperature friction wear, making it suitable for complex high-temperature applications such as hot forging and hot extrusion. Compared to conventional hot work die steels, it offers 40%-60% longer thermal fatigue life and superior die reliability.
The product range includes sheets, round bars, modules/forges, and profiles, with a wide selection of standard specifications available in all forms. Thicknesses range from 5mm to 300mm, and diameters from 10mm to 500mm. The company supports large-scale custom forgings and special-size customization, while also offering tailored heat treatment services. This eliminates the need for additional secondary processing by customers, enabling direct adaptation to the design and manufacturing requirements of various hot work dies, thereby saving processing time and costs.
As a mainstream hot work die steel, 5CrNiMo offers a competitive pricing with outstanding cost-performance ratio. Compared to high-end hot work die steels like H13, it reduces procurement costs by 20%-30%. Its mature heat treatment process and strong machining adaptability, combined with excellent thermal fatigue resistance, result in lower maintenance and replacement frequency. This effectively lowers the lifecycle costs of hot work die manufacturing and usage, thereby enhancing production efficiency for high-temperature processing.
Every batch undergoes rigorous quality control encompassing chemical composition analysis, metallographic examination, hardness measurement, tensile strength testing, impact toughness evaluation, and non-destructive testing (ultrasonic inspection). These comprehensive procedures ensure all specifications comply with national standards and client requirements. We provide complete test reports, material certifications, and heat treatment documentation, with third-party re-inspection capabilities to guarantee product reliability and customer confidence.
5CrNiMo, with its outstanding high-temperature performance, is widely used in hot work die manufacturing. It is suitable for working conditions such as impact loads and thermal cycling at medium-high temperatures. Specific applications include:
This equipment is designed for manufacturing various hot forging dies, including forging hammer dies, press forging dies, and tire film forging dies. It can forge metal components such as carbon steel and alloy steel parts (e.g., automotive connecting rods, crankshafts, gears, and valve forgings). The system withstands forging impact loads at 500-600°C, resists high-temperature friction between forgings and dies, ensures dimensional accuracy and surface quality of the products, and enhances the production efficiency of hot forging processes.
The system produces hot extrusion dies for materials including aluminum, copper, and alloy steel, along with extrusion cylinders and rods. These components are specifically designed for manufacturing profiles, pipes, and bars (e.g., aluminum alloy window frames and seamless steel pipes). Featuring exceptional thermal strength and fatigue resistance, the dies withstand extreme high-temperature pressures and friction during extrusion, effectively preventing wear, deformation, or cracking. This ensures consistent dimensional accuracy and superior quality in extruded products.
Designed for manufacturing small and medium-sized die-casting molds, including cavities, cores, and frames for aluminum and zinc alloy die-casting molds, these molds are suitable for producing die-cast products such as automotive components, electronic parts, and hardware accessories. Their thermal fatigue resistance effectively withstands repeated high-temperature metal liquid erosion and thermal cycling during the die-casting process, reducing mold thermal cracking, extending the service life of die-casting molds, and ensuring the surface finish of die-cast parts.
This material is designed for manufacturing hot forming dies, including steel plate hot stamping dies, high-temperature bending dies, and hot pressing dies. It is particularly suitable for automotive high-strength steel plate hot forming and high-temperature metal material shaping applications. The material's stable hardness and strength at elevated temperatures ensure that the dies remain deformed-free during high-temperature forming processes, thereby maintaining dimensional accuracy and surface quality of the formed parts. This makes it ideal for mass production in hot forming applications.
Beyond its aforementioned applications, 5CrNiMo is also utilized in manufacturing high-temperature wear-resistant mechanical components, including high-temperature gears, cams, hot shear blades, and high-temperature fixtures. These components are extensively employed in industries such as machine tool manufacturing, metallurgy, and automotive production. Additionally, 5CrNiMo serves as auxiliary parts for large-scale hot working dies, such as die frames, guide columns, and ejectors, meeting the comprehensive assembly requirements of various hot working dies and providing all-around material support for hot working processes.
5CrNiMo is a classic hot work die steel belonging to the alloy tool steel category. With its excellent thermal strength, toughness, and hardenability, it is widely used in medium and high-temperature die manufacturing. This product is produced using high-quality scrap steel and alloy raw materials through processes including electric arc furnace smelting, electroslag remelting refinement, and forging. The precise chemical composition and strict control of impurity content ensure a uniform, dense internal structure and fine-grained morphology. Its core features are distinct: outstanding thermal stability and resistance to thermal fatigue, maintaining consistent hardness and strength even at 500-600°C, effectively resisting crack damage caused by thermal cycling; high hardenability enables uniform quenched structures in thicker sections, with minimal hardness variation between the core and surface of large dies; balanced toughness and plasticity allow it to withstand high-temperature impact loads, preventing die fractures; combined with good machinability and polishing properties, it meets the manufacturing requirements for complex-shaped hot work dies. Whether for hot forging, hot extrusion, die casting, or hot forming, 5CrNiMo delivers stable high-temperature performance, providing reliable assurance for hot processing production. It is an indispensable high-quality hot work die steel material in industrial manufacturing.
The 5CrNiMo products showcased here cover a wide range of specifications and models, designed to meet diverse processing and application requirements for hot working dies. The specific models and detailed parameters are as follows:
- Plate specifications: 5CrNiMo-δ (thickness) × W (width) × L (length), with thickness ranging from 5mm to 300mm, widths available in 1000mm, 1220mm, or 1500mm, and standard lengths of 2000mm or 2500mm, customizable as needed. The plates are formed through hot rolling or forging, with surface treatments including black skin, annealed state, or rough machining, meeting the processing requirements of various hot work dies.
- Round steel specifications: 5CrNiMo-Φ (diameter) × L (length), with diameters ranging from 10mm to 500mm and standard lengths of 6000mm. Customized cutting is available upon request. Precision grades include standard (±0.5mm) and high-precision (±0.1mm), meeting diverse requirements for precision hot work die components.
- Module/Forged Part Specifications: 5CrNiMo alloy, dimensions from 100×100×100mm to 800×800×800mm, with customization for large irregular forgings. The module features refined grain structure through forging, resulting in dense internal microstructure with enhanced thermal strength and toughness, making it ideal for processing large-scale hot forging dies, hot extrusion dies, and other integral molds.
- Material specifications: 5CrNiMo steel (including square and flat steel). Square steel available in sizes 50mm×50mm to 300mm×300mm, flat steel in 20mm×50mm to 50mm×300mm. Customizable length. The annealed surface meets requirements for manufacturing hot working die auxiliary components (e.g., die frames, guide columns).
- Compliance standard: GB/T 1299-2014 (National Standard), equivalent to the international standard ISO 4957 55NiCrMoV6, ensuring product quality meets industry specifications. Material certificates, heat treatment reports, and test reports are available upon request.
- Chemical composition (mass percentage,%): C 0.50-0.60, Si 0.25-0.60, Mn 0.50-0.80, P ≤0.030, S ≤0.030, Cr 0.50-0.80, Ni 1.40-1.80, Mo 0.20-0.30. The precise composition ratio endows the steel with excellent thermal strength, toughness, and thermal fatigue resistance, which is a key guarantee for its core high-temperature performance.
- Heat treatment parameters: Anneal at 780-820°C for 3-5 hours with furnace cooling, achieving hardness ≤241HBW. Quench at 830-860°C with oil or air cooling, reaching HRC52-56. Temper at 480-520°C for 2-4 hours with air cooling to room temperature, stabilizing hardness at HRC40-45 (suitable for high-temperature hot work dies). The process can be customized according to die dimensions and operational requirements.
The 5CrNiMo products feature a regular appearance with no visible defects: The surfaces of plates and modules are smooth, free from cracks, inclusions, porosity, shrinkage cavities, or other imperfections. The forging marks are uniform, edges are smooth without burrs, and cutting surfaces are well-aligned. Dimensional accuracy is strictly controlled, with deviations within industry-accepted limits. Round bars and profiles exhibit uniform surface coloration without oxide scale accumulation, demonstrating excellent consistency in diameter and cross-sectional dimensions without noticeable bending or deformation. The overall appearance showcases superior forging and refining quality, making them ready for direct use in subsequent mold processing.
Metallographic analysis reveals that the annealed 5CrNiMo steel exhibits a microstructure of spherical pearlite with dispersed carbides, featuring uniformly fine grains averaging 7-8 microns, which facilitates machining. After quenching and tempering, the microstructure transforms into tempered sorbite with minimal carbide precipitation, demonstrating uniform and fine distribution without significant agglomeration. This significantly enhances the material's thermal stability and thermal fatigue resistance. Through electroslag remelting and forging processes, the steel achieves complete impurity removal, with defects like shrinkage cavities, porosity, and segregation occurring at extremely low rates. The density exceeds 99.8%, ensuring structural integrity under prolonged high-temperature thermal cycling without fracture failure, thereby guaranteeing stable operation and extended service life for hot working dies.
- Hardness: The annealed state hardness is ≤241 HBW, facilitating mechanical processing; after quenching and tempering, the hardness stabilizes at HRC40-45, and remains above HRC38 at 500-600°C, effectively resisting high-temperature friction and wear, thereby extending the service life of hot work dies.
- Mechanical properties (tempered): tensile strength ≥980MPa, yield strength ≥785MPa, elongation δ5≥10%, impact toughness αk≥60J/cm² (at room temperature). Even at high temperatures (550℃), the impact toughness remains above 30J/cm², demonstrating excellent strength-toughness balance. This enables the material to withstand high-temperature impact loads and prevents mold brittleness.
- Thermal fatigue resistance: After 500 thermal cycling cycles (20°C-600°C), the surface shows no visible thermal cracks. This performance surpasses conventional hot work die steel, effectively resisting repeated heating and cooling during hot processing to minimize thermal cracking failures.
- Hardening capability: The core maintains hardness above HRC45 after quenching at a 200mm thickness. Oil cooling alone suffices for quenching, eliminating complex cooling equipment. This simplifies heat treatment for large hot work dies, reduces production costs, and accommodates diverse die heat treatment requirements.
Using high-purity alloy materials and a dual-refining process combining electric arc furnace smelting with electroslag remelting, we rigorously control chemical composition and impurity levels to ensure stable and reliable steel quality. The steel is then forged to refine grain structure, enhancing internal density. This approach eliminates the risk of mold failure caused by material defects at the source, providing a solid foundation for the processing and long-term high-temperature operation of hot work dies.
This material demonstrates exceptional high-temperature performance with outstanding thermal stability and thermal fatigue resistance, enabling long-term stable operation at 500-600°C while resisting thermal cycling damage. It achieves a balanced combination of high-temperature strength and toughness, capable of withstanding both thermal shock loads and high-temperature friction wear, making it suitable for complex high-temperature applications such as hot forging and hot extrusion. Compared to conventional hot work die steels, it offers 40%-60% longer thermal fatigue life and superior die reliability.
The product range includes sheets, round bars, modules/forges, and profiles, with a wide selection of standard specifications available in all forms. Thicknesses range from 5mm to 300mm, and diameters from 10mm to 500mm. The company supports large-scale custom forgings and special-size customization, while also offering tailored heat treatment services. This eliminates the need for additional secondary processing by customers, enabling direct adaptation to the design and manufacturing requirements of various hot work dies, thereby saving processing time and costs.
As a mainstream hot work die steel, 5CrNiMo offers a competitive pricing with outstanding cost-performance ratio. Compared to high-end hot work die steels like H13, it reduces procurement costs by 20%-30%. Its mature heat treatment process and strong machining adaptability, combined with excellent thermal fatigue resistance, result in lower maintenance and replacement frequency. This effectively lowers the lifecycle costs of hot work die manufacturing and usage, thereby enhancing production efficiency for high-temperature processing.
Every batch undergoes rigorous quality control encompassing chemical composition analysis, metallographic examination, hardness measurement, tensile strength testing, impact toughness evaluation, and non-destructive testing (ultrasonic inspection). These comprehensive procedures ensure all specifications comply with national standards and client requirements. We provide complete test reports, material certifications, and heat treatment documentation, with third-party re-inspection capabilities to guarantee product reliability and customer confidence.
5CrNiMo, with its outstanding high-temperature performance, is widely used in hot work die manufacturing. It is suitable for working conditions such as impact loads and thermal cycling at medium-high temperatures. Specific applications include:
This equipment is designed for manufacturing various hot forging dies, including forging hammer dies, press forging dies, and tire film forging dies. It can forge metal components such as carbon steel and alloy steel parts (e.g., automotive connecting rods, crankshafts, gears, and valve forgings). The system withstands forging impact loads at 500-600°C, resists high-temperature friction between forgings and dies, ensures dimensional accuracy and surface quality of the products, and enhances the production efficiency of hot forging processes.
The system produces hot extrusion dies for materials including aluminum, copper, and alloy steel, along with extrusion cylinders and rods. These components are specifically designed for manufacturing profiles, pipes, and bars (e.g., aluminum alloy window frames and seamless steel pipes). Featuring exceptional thermal strength and fatigue resistance, the dies withstand extreme high-temperature pressures and friction during extrusion, effectively preventing wear, deformation, or cracking. This ensures consistent dimensional accuracy and superior quality in extruded products.
Designed for manufacturing small and medium-sized die-casting molds, including cavities, cores, and frames for aluminum and zinc alloy die-casting molds, these molds are suitable for producing die-cast products such as automotive components, electronic parts, and hardware accessories. Their thermal fatigue resistance effectively withstands repeated high-temperature metal liquid erosion and thermal cycling during the die-casting process, reducing mold thermal cracking, extending the service life of die-casting molds, and ensuring the surface finish of die-cast parts.
This material is designed for manufacturing hot forming dies, including steel plate hot stamping dies, high-temperature bending dies, and hot pressing dies. It is particularly suitable for automotive high-strength steel plate hot forming and high-temperature metal material shaping applications. The material's stable hardness and strength at elevated temperatures ensure that the dies remain deformed-free during high-temperature forming processes, thereby maintaining dimensional accuracy and surface quality of the formed parts. This makes it ideal for mass production in hot forming applications.
Beyond its aforementioned applications, 5CrNiMo is also utilized in manufacturing high-temperature wear-resistant mechanical components, including high-temperature gears, cams, hot shear blades, and high-temperature fixtures. These components are extensively employed in industries such as machine tool manufacturing, metallurgy, and automotive production. Additionally, 5CrNiMo serves as auxiliary parts for large-scale hot working dies, such as die frames, guide columns, and ejectors, meeting the comprehensive assembly requirements of various hot working dies and providing all-around material support for hot working processes.
