{"id":9609,"date":"2025-08-08T09:28:25","date_gmt":"2025-08-08T01:28:25","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=9609"},"modified":"2026-01-05T14:14:24","modified_gmt":"2026-01-05T06:14:24","slug":"plastic-mold-steels","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/plastic-mold-steels\/","title":{"rendered":"Plastic Mold Steels Catalog"},"content":{"rendered":"
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Plastic Mold Steels Catalog<\/mark><\/h1>\n\n\n\n
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Send Inquiry Now<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n
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P20 Tool Steel | 1.2311\u00a0| 3Cr2Mo<\/h3>\n\n\n\n

P20 is an industry-standard steel grade for plastic injection molds and zinc die-casting molds, typically supplied in a pre-hardened condition. It offers excellent machinability, enabling direct cavity machining without subsequent heat treatment, effectively reducing manufacturing costs and lead times. This makes it the preferred material for producing large, cost-effective mold bases.<\/p>\n\n\n\n

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\"p20<\/figure>
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P20+Ni Tool Steel | 1.2738<\/h3>\n\n\n\n

P20+Ni is a pre-hardened mold steel reinforced with nickel based on P20, offering both polishability and engraving performance. Nickel significantly enhances the material’s hardenability, ensuring uniform hardness across large billet cross-sections and effectively preventing core hardness reduction. It is used for manufacturing complex molds requiring high surface finish or photo-etching processes.<\/p>\n\n\n\n

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What is Plastic Mold Steel<\/h2>\n\n\n\n

Plastic mold steel is mainly used to manufacture molds for forming and processing plastic materials. It is classified as \u201cP group steel\u201d in the AISI<\/mark><\/a> classification system and as cold work tool steel in the EN\/DIN standards. The temperature of plastic molding processes is usually below 200\u00b0C. Compared with metal molding, the heat resistance or wear resistance of plastic mold steel is often not critical, but the surface quality requirements are very high.<\/p>\n\n\n\n

Many plastic mold steels are supplied in a prehardened condition (e.g., P20 grades at 32 HRC, DIN 1.2711 at 40 HRC). This eliminates the need for the mold maker to perform final heat treatment, minimizing the risk of distortion and reducing overall manufacturing time and cost. If not prehardened, the steels are typically sold in the annealed condition to facilitate shaping and then hardened by heat treatment.<\/p>\n\n\n\n

Specific Steel Grades<\/h2>\n\n\n\n

Several specific tool steel grades are commonly used for plastic molds, chosen based on the part’s complexity, production volume, and required surface finish:<\/p>\n\n\n\n

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  1. P-Series Steels<\/strong>. The most common grades are P20(1.2311), P20S(1.2312), and P20Ni(1.2738). Low-carbon grades, such as P2, P4, and P6, are typically used for “hubbed” (hobbed) cavities, where a hardened steel master hub is forced into a softer die blank to form the impression.<\/li>\n\n\n\n
  2. Hot-Work Steels<\/strong> – H13<\/mark><\/a><\/strong>. An excellent mold steel for plastic molding and die casting dies. It exhibits outstanding resistance to tempering, a lower tendency to crack, and minimal distortion during air hardening. When heat-treated to higher hardness (>50 HRC), it offers excellent polishability and responds very well to nitriding, achieving high surface hardness.<\/li>\n\n\n\n
  3. Martensitic Stainless Steels<\/strong>–420 stainless steel<\/mark><\/a> and modifications<\/strong>. Commonly used for injection molds, especially for corrosive plastics or in severe atmospheric conditions, as it provides inherent corrosion resistance without the need for chromium plating. It can achieve a mirror finish and good dimensional stability after heat treatment. However, tempering in a specific range (425-595\u00b0C) can cause embrittlement and loss of corrosion resistance.<\/li>\n\n\n\n
  4. Shock-Resisting Steels – S7<\/mark><\/a><\/strong>. Recommended for molds requiring very high shock resistance.<\/li>\n\n\n\n
  5. Cold-Work Tool Steels (e.g., A2<\/mark><\/a>, D2<\/mark><\/a>)<\/strong><\/strong>. Used for applications demanding higher wear resistance, particularly when molding abrasive plastics (e.g., fiber-reinforced plastics).<\/li>\n<\/ol>\n\n\n\n

    Properties<\/h2>\n\n\n\n
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    1. Polishability & Texturability.<\/strong> Molten plastics can reproduce minute details on the mold surface, making a perfect, defect-free surface crucial for the final product’s appearance. The high surface hardness of plastic mold steel significantly enhances polishability and minimizes polishing defects such as “orange-peel” (localized strain hardening).<\/li>\n\n\n\n
    2. Hardness and Strength<\/strong>. The high surface hardness and high core strength of plastic mold steel can prevent the cavity from “sinking” under high injection pressures. While the hardness of prehardened plastic molds typically ranges from 30 to 40 HRC, they can be surface-hardened via carburizing or nitriding to improve wear resistance.<\/li>\n\n\n\n
    3. Toughness and Shock Resistance<\/strong>. Molds are subjected to mechanical shocks during operation (opening\/closing) and thermal shocks from rapid heating\/cooling cycles, especially in fast-cycling machines. Good toughness can prevent cracking.<\/li>\n\n\n\n
    4. Dimensional Stability<\/strong>. Minimizing distortion or dimensional change during heat treatment is critical for precision molds.<\/li>\n\n\n\n
    5. Machinability<\/strong>. Machining constitutes a significant portion (up to 70%) of the total mold manufacturing cost. Steels that are easier to machine can significantly reduce overall costs.<\/li>\n\n\n\n
    6. Corrosion Resistance<\/strong>. Essential when processing corrosive plastics (e.g., polyvinyl chloride (PVC), which can release HCl when degraded) or when molds are stored in humid environments.<\/li>\n\n\n\n
    7. Weldability<\/strong>. Good weldability is beneficial for mold repair and maintenance, thereby extending tool life.<\/li>\n<\/ol>\n\n\n\n

      Surface Treatments<\/h2>\n\n\n\n
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      • Carburizing<\/strong>: A process where carbon is diffused into the surface to increase hardness and wear resistance, particularly for low-carbon mold steels like P2 and P6.<\/li>\n\n\n\n
      • Nitriding<\/strong>: Diffuses nitrogen into the surface, significantly increasing hardness and corrosion resistance while reducing friction. H13 steel responds very well to nitriding.<\/li>\n\n\n\n
      • Chromium\/Nickel Plating<\/strong>: Can be applied for wear resistance or corrosion protection, especially against aggressive plastics like PVC. However, the use of corrosion-resistant stainless steels can eliminate the need for plating.<\/li>\n\n\n\n
      • Flame Hardening<\/strong>: Used for localized hardening of specific areas subject to wear or brinelling.<\/li>\n<\/ul>\n\n\n\n

        Challenges and Defects<\/h2>\n\n\n\n
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        • Polishing Defects<\/strong>: Can include “pin-holes” from nonmetallic inclusions and “orange-peel” due to localized strain hardening during over-polishing.<\/li>\n\n\n\n
        • Texturing Issues<\/strong>: Poor surface preparation or microstructural inhomogeneities can lead to uneven etching results.<\/li>\n\n\n\n
        • Distortion during Heat Treatment<\/strong>: Expansions, contractions, warpage, and shape changes can occur, necessitating precise control and, ideally, the use of prehardened or air-hardening grades.<\/li>\n<\/ul>\n\n\n\n

          Applications<\/h2>\n\n\n\n

          Injection Molding of Thermoplastics
          Compression Molding of Thermoset Plastics
          Blow Molding and Extrusion
          Die Casting Dies: Used for low-melting alloys such as tin, zinc, and lead.
          Glass Product Molds: Some mold steels are also used for glass manufacturing, requiring properties like high wear resistance, resistance to scaling, high-temperature strength, and polishability.<\/p>\n\n\n\n

          FAQ<\/h2>\n\n\n\n
          What is plastic mold steel?<\/strong><\/strong>

          Plastic mold steel is a type of tool steel specifically designed for the manufacture of molds used in plastic injection and compression molding. These steels are chosen for their excellent polishability, micro-cleanliness, machinability, and dimensional stability.<\/p> <\/div>

          Can you mold plastic to metal?<\/strong><\/strong>

          Yes, plastic can be molded into metal. This occurs through processes like insert injection molding, where plastic is molded around pre-existing metal components78, or through metal injection molding (MIM), where metal powder is mixed with a plastic binder, molded, and then sintered9….<\/p> <\/div>

          What is the use of mold steel?<\/strong>

          Mold steels are primarily used to create molds and dies for shaping various materials, most notably plastics, as well as for die casting, ceramic molding, and powder molding.<\/p> <\/div>

          What type of steel is used for molds?<\/strong>

          Common types of tool steels used for molds include P-series steels (e.g., P20, P21, P6), H-series steels (e.g., H13, H12, H21, H25), A-series (e.g., A2), D-series (e.g., D2), and martensitic stainless steels (e.g., Type 420, 17-4 PH). The selection depends on production volume, casting characteristics, and required accuracy.<\/p> <\/div>

          Can silicone molds be used for metal?<\/strong>

          They are generally not suitable for direct high-temperature casting of molten metal due to silicone’s lower temperature resistance.<\/p> <\/div> <\/div>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

          P20 Tool Steel | 1.2311\u00a0| 3Cr2Mo P20 is an industry-standard steel grade for plastic injection molds and zinc die-casting molds, typically supplied in a pre-hardened condition. It offers excellent machinability, enabling direct cavity machining without subsequent heat treatment, effectively reducing manufacturing costs and lead times. This makes it the preferred material for producing large, cost-effective […]<\/p>\n","protected":false},"author":1,"featured_media":6593,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"landing-page","_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-9609","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\nPlastic Mold Steels Catalog - AoboSteel<\/title>\n<meta name=\"description\" content=\"Explore the key properties of plastic mold steels and discover how they enhance mold making in industrial applications.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aobosteel.com\/ko\/plastic-mold-steels\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plastic Mold Steels Catalog\" \/>\n<meta property=\"og:description\" content=\"Explore the key properties of plastic mold steels and discover how they enhance mold making in industrial applications.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aobosteel.com\/ko\/plastic-mold-steels\/\" \/>\n<meta property=\"og:site_name\" content=\"AoboSteel\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/profile.php?id=61565368220197\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-05T06:14:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/04\/p20-mold-steel.avif\" \/>\n\t<meta property=\"og:image:width\" content=\"500\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\uc608\uc0c1 \ub418\ub294 \ud310\ub3c5 \uc2dc\uac04\" \/>\n\t<meta name=\"twitter:data1\" content=\"6\ubd84\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"TechArticle\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/plastic-mold-steels\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/plastic-mold-steels\\\/\"},\"author\":{\"name\":\"Evan\",\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#\\\/schema\\\/person\\\/96118415c30ca6bb52eaf1127b052ef7\"},\"headline\":\"Plastic Mold Steels Catalog\",\"datePublished\":\"2025-08-08T01:28:25+00:00\",\"dateModified\":\"2026-01-05T06:14:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/plastic-mold-steels\\\/\"},\"wordCount\":1116,\"publisher\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/aobosteel.com\\\/plastic-mold-steels\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/aobosteel.com\\\/wp-content\\\/uploads\\\/2025\\\/04\\\/p20-mold-steel.avif\",\"inLanguage\":\"ko-KR\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/aobosteel.com\\\/plastic-mold-steels\\\/\",\"url\":\"https:\\\/\\\/aobosteel.com\\\/plastic-mold-steels\\\/\",\"name\":\"Plastic Mold Steels Catalog - 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