Aço para Moldes

Selecting the correct mold steel is the foundational engineering choice that dictates tool life, thermal cycle times, surface polishability, and corrosion resistance during plastic injection molding. Tool steel choices range from pre-hardened P20 and 718H for cost-effective medium-volume production to fully hardened S136 stainless steel and H13 tool steel (52+ HRC) for 1,000,000+ shot Class 101 molds. At Jucheng Precision, a certified ISO 9001 and IATF 16949 contract manufacturer, we specialize in high-hardness steel mold building. Utilizing 25+ in-house 5-axis CNC machining centers, vacuum heat treatment, and SPI A-1 diamond mirror polishing, we machine steel cavities to ±0.005mm tolerances verified by Zeiss CMM inspection.

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Nossos materiais disponíveis

Aço para Molde P20

Eliminar a distorção do tratamento térmico pós-usinagem, garantindo uma solução de ferramentaria econômica para produção em médio volume, exige uma liga pré-endurecida projetada, que o aço para molde AISI P20 (DIN 1.2311) oferece. Pré-endurecido uniformemente a 28–34 HRC, o aço P20 proporciona excelente usinabilidade, dureza uniforme no núcleo e boa polibilidade até um acabamento SPI B-2. Na Jucheng Precision, fabricante contratado certificado ISO 9001 e IATF 16949, somos especializados em usinagem CNC de 5 eixos de insertos de cavidade de molde em aço P20. Entregando vida útil de ferramenta de até 500.000 ciclos, nossos moldes de injeção em P20 processam termoplásticos de commodities e de engenharia, verificados por inspeção CMM Zeiss.

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Aço-ferramenta H13

Para resistir ao desgaste abrasivo severo da ferramenta causado por compostos reforçados com fibras e suportar ciclos térmicos rápidos sem fissuração térmica, é necessária uma liga de trabalho a quente de alta dureza, que o aço-ferramenta AISI H13 (DIN 1.2344) oferece. Temperado a vácuo e revenido três vezes para 50–54 HRC, o aço H13 de cromo-molibdênio-vanádio proporciona excepcional resistência ao choque térmico, alta resistência à compressão e resistência inabalável ao desgaste no canal de injeção. Na Jucheng Precision, um fabricante contratado certificado ISO 9001 e IATF 16949, somos especializados em usinagem CNC de 5 eixos de cavidades de moldes em aço H13. Entregando vida útil de ferramenta classe 101 excedendo 1.000.000 de ciclos, nossos moldes H13 processam de forma confiável superpolímeros de alta temperatura e resinas abrasivas com carga, verificados por inspeção CMM Zeiss.

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Aço para Moldes S136

Eliminar a micro-pitação superficial e proteger as paredes da cavidade do molde contra a liberação de gases ácidos em moldagem médica e óptica de alta pureza requer uma liga de aço inoxidável refunda por eletroescória, que o aço para moldes S136 proporciona. Temperado a vácuo para 48–52 HRC, o aço ferramenta inoxidável ESR S136 contém 13,6% de cromo, oferecendo resistência excepcional à ferrugem nas linhas de resfriamento e à degradação corrosiva de polímeros. Na Jucheng Precision, um fabricante contratado certificado ISO 9001 e ISO 13485, somos especializados em usinagem CNC de 5 eixos e polimento espelhado de diamante de insertos de molde em aço S136. Alcançando um acabamento de superfície óptica SPI A-1, nossos moldes de produção em S136 garantem mais de 1.000.000 de ciclos verificados por inspeção CMM Zeiss.

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Aço para Molde 718

Eliminating thermal quench distortion in large-scale mold blocks while securing superior core hardness uniformity over standard P20 requires an advanced nickel-alloy pre-hardened steel, which 718H (DIN 1.2738) mold steel delivers. Pre-hardened to a uniform 32–38 HRC, 718H steel contains nickel additives that ensure consistent hardness across thick tool sections up to 400mm depth, taking a fine SPI B-1 polish and crisp photo-etched textures. At Jucheng Precision, a certified ISO 9001 and IATF 16949 contract manufacturer, we specialize in 5-axis CNC machining of large 718 steel mold cavities. Delivering tool shot lives up to 500,000+ cycles, our 718 molds reliably process automotive panels and appliance enclosures, verified by Zeiss CMM inspection.

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Aço para Molde NAK80

Achieving an optimal balance between pre-hardened core steel strength, pinhole-free EDM spark-eroded finishes, and mirror-level surface polishability without post-machining heat treatment distortion requires a precipitation-hardened alloy, which NAK80 mold steel delivers. Age-hardened at the mill to a uniform 37–43 HRC, NAK80 (Cu-Al-Ni alloyed steel) provides exceptional machinability, uniform grain structure, and high weldability. At Jucheng Precision, a certified ISO 9001 and IATF 16949 contract manufacturer, we specialize in 5-axis CNC machining and precision EDM eroding of NAK80 steel mold inserts. Delivering tool shot lives exceeding 500,000 cycles, our NAK80 molds produce high-gloss cosmetic enclosures and clear optical lenses verified by Zeiss CMM inspection.

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Selecting the correct mold steel is the single most critical engineering decision in Fabricação de Moldes Personalizados. From pre-hardened steels for cost-effective pilot runs to fully hardened stainless steels for 1,000,000+ cycle production tools, choosing the right alloy dictates part surface finish, tool longevity, and thermal cycle efficiency.

Tool Steel Grade Performance & HRC Hardness Matrix

We machine and heat-treat premium tool steel alloys from certified European and Asian steel mills to match your production volume and resin chemistry:

Tool Steel Grade Hardness (HRC) Corrosion & Wear Resistance Vida Útil Garantida do Molde
S136 Stainless Steel 48 – 52 HRC (Hardened) High chromium stainless steel. Exceptional corrosion resistance against acidic outgassing; takes an SPI A-1 diamond mirror polish. 1,000,000+ Shots
Aço-ferramenta H13 50 – 54 HRC (Hardened) Hot-work steel with extreme thermal shock resistance and high compressive strength. Resists abrasive glass-fiber wear. 1,000,000+ Shots
P20 / 718H Steel 28 – 34 HRC (Pre-hardened) Versatile pre-hardened steel offering excellent machinability and uniform core hardness without post-heat treatment distortion. 250,000 – 500,000 Shots
NAK80 Steel 37 – 43 HRC (Pre-hardened) Pre-hardened age-hardened steel providing superior EDM spark finish capability, high polishability, and excellent weldability. 500,000+ Shots

Tool Steel Compatibility with Engineering Resins

Different polymer chemistries exert distinct physical demands on tool cavity surfaces during Moldagem por Injeção de Plástico:

Resin Chemistry Class Recommended Tool Steel Engineering Tooling Rationale
Optical Clear & Medical Resins (Policarbonato (PC), PMMA (Acrílico), Resina de Grau Médico e Biocompatível) S136 Stainless Steel (50 HRC) High-purity stainless structure takes a diamond mirror polish (Acabamentos de Superfície SPI A-1) without micro-pitting or rust inclusions.
Abrasive Fiber Compounds (Fibra de Vidro (GF), Fibra de Carbono (CF)) H13 Tool Steel (52-54 HRC) High surface hardness prevents gate erosion and cavity pitting caused by high-velocity glass or carbon fiber shear.
Corrosive & Flame Retardant Resins (Retardante de Chama (FR), PVC (Polyvinyl Chloride)) High-Chromium S136 / M340 Stainless Resists acidic outgassing generated when flame retardants or vinyl compounds break down at high melt processing temperatures.
Standard Commodity Resins (Polipropileno (PP), Polietileno (PE), ABS, Poliestireno (PS)) P20 / 718H / NAK80 Steel Optimizes tooling cost and delivery lead times while providing reliable 250k–500k shot lives for Moldagem por Injeção de Alto Volume.

Steel Heat-Treatment & Anti-Corrosion Matrix

Executing precision mold building demands strict metallurgical heat-treatment control and 5-axis CNC machining:

Vacuum Heat Treatment & Stress Relieving

Hardened steels (S136, H13) undergo computer-controlled vacuum heat treatment followed by triple tempering to achieve uniform 50–54 HRC core hardness. This eliminates internal residual stress and prevents tool warpage during high-speed CNC milling.

5-Axis CNC Precision Cavity Machining

Utilizing 25+ in-house 5-axis CNC machining centers, we cut hardened steel inserts to ±0.005 mm tolerances. This ensures micro-gap shut-offs at parting lines, preventing flash even when running low-viscosity super-polymers like Poliéter-éter-cetona (PEEK) e Sulfeto de Polifenileno (PPS).

Mirror Polishing & Surface Texturing

S136 cavities are hand-polished by master mold makers using diamond paste compounds to achieve SPI A-1 mirror clarity, while P20 and 718 steels support acid etching for Mold-Tech textures or VDI 3400 EDM spark finishes.

Preventive Maintenance & Lifetime Tool Warranty

Molds running at Jucheng undergo scheduled Mold Repair & Maintenance, including ultrasonic cavity cleaning and core alignment checks, ensuring long-term repeatability on Ferramentas de Moldagem por Injeção de Produção tools.

Propriedades do Material

Density (Tool Steel) 7.75 - 7.85 g/cm³
Hardness Range (Fully Hardened S136 / H13) 48 - 54 HRC
Hardness Range (Pre-Hardened P20 / NAK80) 28 - 40 HRC
Tensile Strength (Hardened H13 / S136) 1,500 - 1,950 MPa
Yield Strength (Hardened H13 / S136) 1,200 - 1,600 MPa
Condutividade térmica (23°C) 24 - 30 W/(m·K)
Coeficiente de Expansão Térmica (20-100°C) 11.5 - 12.8 10⁻⁶/K
Compressive Strength (52 HRC) 1,800 - 2,200 MPa
Impact Toughness (Charpy V-Notch) 20 - 35 J
Capacidade de Superfície Polida SPI SPI A-1 (Diamond Mirror Polish) -
Guaranteed Tool Shot Life (Class 101 Hardened) 1,000,000+ Cycles
Maximum Mold Plate Size 2500 x 1800 mm
Tolerância Mínima de Usinagem +/- 0.005 mm