4Cr13 / S136 / HPM38 Stainless Mold Steel | Corrosion Resistant Plastic Mold Steel

We supply high-quality stainless mold steels including 4Cr13, S136, and HPM38, widely used in plastic molds, optical molds, and corrosion-resistant mold tooling. These grades offer excellent polishability, good corrosion resistance, and high hardness stability, making them suitable for producing mirror-finished, high-precision plastic molds, especially in humid or chemical environments.

• Martensitic stainless steel

• Moderate corrosion resistance

• Good polishability and hardness (HRC 48–52 after hardening)

• Used for mold bases, general plastic molds, and knives

• Premium stainless mold steel

• Excellent corrosion resistance & polishability

• Delivered in pre-hardened (HRC 28–32) or hardened condition

• Ideal for medical, food-grade, and transparent plastic molds

• Pre-hardened stainless steel (HRC 30–36)

• Superior machinability and mirror polish surface

• No need for post-heat treatment

• Suitable for high-gloss injection molds and EDM texturing

• Round bar: Dia 20–350 mm

• Flat bar / Plate: Thickness 20–300 mm

• Custom cutting, milling, and grinding available

• Transparent and glossy plastic molds

• Molds for medical devices and food packaging

• High-precision, corrosion-resistant tooling

• Mold bases and inserts for humid environments

• EDM textured or mirror-polished components

• Rust-proof oil + plastic film

• Export wooden cases or pallets

• Labeled with steel grade, heat number, size

• MTC (Material Test Certificate) provided with every order

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