Acier de moule

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.

Mirror-polished-S136-stainless-steel-injection-mold-cavity

Nos matériaux disponibles

Acier de moule P20

Éliminer la distorsion due au traitement thermique après usinage tout en garantissant une solution d'outillage économique pour les productions à volume moyen nécessite un alliage pré-trempé d'ingénierie, ce que l'acier à moules AISI P20 (DIN 1.2311) offre. Pré-trempé à une dureté uniforme de 28–34 HRC, l'acier P20 offre une excellente usinabilité, une dureté de cœur uniforme et une bonne polissabilité jusqu'à une finition SPI B-2. Chez Jucheng Precision, fabricant sous contrat certifié ISO 9001 et IATF 16949, nous sommes spécialisés dans l'usinage CNC 5 axes d'inserts de cavités de moules en acier P20. Offrant des durées de vie d'outillage allant jusqu'à 500 000 cycles, nos moules d'injection en P20 transforment des thermoplastiques de grande diffusion et techniques, vérifiés par inspection CMM Zeiss.

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Acier à outils H13

Resisting severe abrasive tool wear from fiber-reinforced compounds and enduring rapid thermal cycling without heat checking requires a high-hardness hot-work alloy, which AISI H13 (DIN 1.2344) tool steel delivers. Vacuum hardened and triple tempered to 50–54 HRC, H13 chromium-molybdenum-vanadium steel provides exceptional thermal shock resistance, high compressive strength, and unyielding gate wear resistance. At Jucheng Precision, a certified ISO 9001 and IATF 16949 contract manufacturer, we specialize in 5-axis CNC machining of H13 steel mold cavities. Delivering class 101 tool shot lives exceeding 1,000,000 cycles, our H13 molds reliably process high-temperature super-polymers and abrasive filled resins, verified by Zeiss CMM inspection.

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Acier de moule S136

Éliminer le piquage de surface microscopique et protéger les parois des cavités de moule contre le dégazage acide dans le moulage médical et optique de haute pureté nécessite un alliage inoxydable refondu sous laitier électroconducteur, ce que l'acier à mouler S136 offre. Durci sous vide à 48–52 HRC, l'acier à outil inoxydable S136 ESR contient 13,61 % de chrome, offrant une résistance exceptionnelle à la rouille des circuits de refroidissement et à la dégradation corrosive des polymères. Chez Jucheng Precision, un fabricant sous contrat certifié ISO 9001 et ISO 13485, nous sommes spécialisés dans l'usinage CNC 5 axes et le polissage miroir au diamant des inserts de moule en acier S136. Atteignant une finition de surface optique SPI A-1, nos moules de production en S136 garantissent plus de 1 000 000 de cycles vérifiés par inspection CMM Zeiss.

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Acier pour moule 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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Acier pour moule 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 Fabrication de moules sur mesure. 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:

Grade d'acier à outils Dureté (HRC) Corrosion & Wear Resistance Durée de vie garantie du moule en nombre de cycles
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
Acier à outils 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 Moulage par injection plastique:

Resin Chemistry Class Recommended Tool Steel Engineering Tooling Rationale
Optical Clear & Medical Resins (Polycarbonate (PC), PMMA (Acrylique), Résine biocompatible et de qualité médicale) S136 Stainless Steel (50 HRC) High-purity stainless structure takes a diamond mirror polish (Finitions de surface SPI A-1) without micro-pitting or rust inclusions.
Abrasive Fiber Compounds (Fibre de verre (GF), Fibre de carbone (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 (Ignifuge (FR), PVC (polychlorure de vinyle)) 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 (Polypropylène (PP), Polyéthylène (PE), ABS, Polystyrène (PS)) P20 / 718H / NAK80 Steel Optimizes tooling cost and delivery lead times while providing reliable 250k–500k shot lives for High Volume Injection Molding.

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 Polyétheréthercétone (PEEK) et des Polysulfure de phénylène (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 production tools.

Propriétés des matériaux

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
Conductivité thermique (23°C) 24 - 30 W/(m·K)
Coefficient de dilatation thermique (20-100 °C) 11.5 - 12.8 10⁻⁶/K
Résistance à la compression (52 HRC) 1,800 - 2,200 MPa
Impact Toughness (Charpy V-Notch) 20 - 35 J
Capacité de polissage de surface SPI SPI A-1 (polissage miroir diamant) -
Guaranteed Tool Shot Life (Class 101 Hardened) 1 000 000+ cycles
Maximum Mold Plate Size 2500 x 1800 mm
Tolérance d'usinage minimale +/- 0,005 mm