Premium Plastic Mold Steel Plates & Blocks
Welcome to Runfei Steel Group’s plastic mold steel catalog. Designed for the high-precision plastic injection molding industry, our mold steel blocks and plates deliver exceptional polishability, uniform hardness, and outstanding wear resistance. Whether you are manufacturing automotive components, home appliances, or optical lenses, we supply certified steel grades (such as P20, 718H, and S136) that guarantee flawless surface finishes and dimensional stability. Browse our premium mold steel inventory below.
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Your Trusted Supplier for Plastic Injection Mold Steel
Manufacturing high-quality plastic products requires molds with absolute precision and impeccable surface finishes. Since 1998, Runfei Steel Group has been a leading distributor of specialty steel, supplying premium plastic mold steel to tool and die makers worldwide. Sourced from top-tier mills and strictly Ultrasonic Tested (UT), our mold steel guarantees high internal purity—free from porosity and non-metallic inclusions. This ensures your expensive CNC machining and final polishing processes are never compromised.
Core Properties of Our Plastic Mold Steel
We inventory and process specialized mold steel grades designed to meet the rigorous demands of modern plastic injection and extrusion:
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Excellent Polishability (Mirror Finish): Essential for producing transparent plastics or high-gloss surfaces. Our premium grades undergo vacuum degassing and ESR (Electro-Slag Remelting) to achieve a flawless mirror finish.
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Uniform Hardness & Machinability: We supply pre-hardened grades (such as P20 and 718H / 1.2738) that provide consistent hardness from the surface to the core. This offers excellent machinability while eliminating the risk of heat-treatment deformation after rough machining.
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High Wear & Corrosion Resistance: Grades like S136 (1.2083) are formulated to withstand the abrasive wear of fiberglass-reinforced plastics and resist the corrosive gases released by certain polymers (like PVC) during the injection process.
Custom Cutting & Precision Block Processing
Mold making requires materials that fit your CNC machines perfectly. Leveraging our heavy-duty processing facility in Tianjin, we do not just sell raw steel plates. We provide precision band-saw cutting, milling, and grinding services. We can supply custom-sized mold steel blocks, flats, and plates, significantly reducing your rough machining time and material waste.
Frequently Asked Questions (FAQ)
Q: What are the most common plastic mold steel grades you supply?
A: We supply a comprehensive range of globally recognized grades, including pre-hardened P20 (1.2311) and 718H (1.2738) for large automotive and home appliance molds, as well as high-corrosion-resistant S136 (1.2083) and NAK80 for optical and medical plastic molds.
Q: Can your plastic mold steel achieve a mirror-like surface finish?
A: Yes. We supply highly refined, vacuum-degassed, and ESR (Electro-Slag Remelted) steel grades. These advanced metallurgical processes remove microscopic impurities, allowing mold makers to achieve the flawless, high-gloss mirror finish required for lenses, screens, and cosmetic packaging.
Q: Do you provide Mill Test Reports (MTR) and guarantee internal purity?
A: Absolutely. A single internal defect can ruin an entire mold at the final polishing stage. We provide official Mill Test Reports and guarantee that our premium mold steel passes strict Ultrasonic Testing (UT) to ensure 100% internal structural integrity.
