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Changzhou Hongxinyutai Precision Mold Co., Ltd., a professional manufacturer established in 2017 with a factory area of 1,000–3,000 square meters and a team of 51–100 skilled employees, proudly presents the Germany Gröditz GPM58 Mold Steel — a premium material engineered specifically for plastic components requiring an exceptionally smooth finish. This steel, sourced from the renowned German mill Gröditz (part of the Deutsche Edelstahlwerke group), combines high purity, consistent hardness, and excellent polishability, making it an ideal choice for high-gloss plastic injection molds, optical parts, and consumer electronics housings. With our TS16969 certified quality management system, we ensure that every block of GPM58 meets rigorous international standards, supporting your production of flawless plastic components.
The GPM58 mold steel is a pre-hardened, high-performance tool steel specifically developed for the plastic molding industry. Its unique chemical composition and controlled manufacturing process deliver superior wear resistance, dimensional stability, and outstanding texture replication. Whether you are producing automotive interior trims, household appliances, or medical device casings, this steel guarantees a mirror-like surface finish without porosity or defects. Below, we detail the key features, technical specifications, and benefits that make GPM58 a trusted choice among mold makers worldwide.
Key Features & Technical Specifications
- Source & Quality: Manufactured by Gröditz (Germany) — known for rigorous quality control and consistent metallurgy. Each block is ultrasonically tested for internal soundness.
- Pre-hardened Condition: Supplied at 38–42 HRC, eliminating the need for post-machining heat treatment, reducing lead time and distortion risk.
- High Polishability: Achieves a surface roughness of Ra ≤ 0.01 μm after polishing, ideal for high-gloss and transparent plastic parts.
- Excellent Machinability: Optimized for CNC milling, EDM, and wire cutting — allows complex cavity details with tight tolerances.
- Wear Resistance: Fine carbide distribution provides resistance against abrasive fillers (e.g., glass fiber) in plastic compounds.
- Dimensional Stability: Low residual stress after pre-hardening ensures minimal deformation during machining and in-service temperature changes.
- Weldability: Good weldability for repair or design modifications, with pre-heating recommended (optional service available).
- Available Sizes: Blocks, plates, and custom dimensions — contact us for stock list and cutting services.
| Property | Value |
| Hardness (supplied) | 38–42 HRC |
| Tensile Strength | Approx. 1300 MPa |
| Impact Toughness (Charpy V-notch) | ≥ 15 J/cm² |
| Maximum Service Temperature | 300°C (continuous) |
| Thermal Conductivity | ~25 W/m·K (at 20°C) |
| Density | 7.85 g/cm³ |
| Polishability rating | Excellent (Ra ≤ 0.01 μm achievable) |
| Corrosion resistance | Moderate (for standard plastic molds) |
Customer Benefits: By choosing our GPM58 mold steel, you gain a competitive edge through faster production cycles, reduced maintenance, and superior part quality. The pre-hardened state eliminates the need for additional heat treatment, saving both time and cost. The excellent polishability allows you to achieve mirror finishes directly, reducing secondary polishing operations. Furthermore, the dimensional stability ensures that your molds maintain tight tolerances even after thousands of cycles, resulting in consistent plastic components with minimal scrap rate.
Our factory, located in Changzhou, Jiangsu, China, serves a global clientele across North America, South America, Europe, Southeast Asia, Africa, Oceania, the Middle East, and domestic markets. We ship from major ports including Jiangsu, Shanghai, and Shenzhen, ensuring efficient logistics. With a dedicated team of 51–100 skilled workers and a TS16969 certified quality system, we guarantee that every piece of GPM58 steel we supply meets the highest standards of consistency and reliability.
Trust & Credibility: Since 2017, Changzhou Hongxinyutai has built a reputation for delivering premium mold materials and precision services. Our TS16969 certification reflects our commitment to quality management, and our long-term partnerships with clients in over a dozen countries speak to our reliability. We offer custom cutting, surface treatment, and technical support to ensure you get the exact material you need. Combine that with competitive pricing and fast delivery, and you have a partner that helps you succeed in the demanding plastic molding industry.
Don't compromise on your mold quality — choose Germany Gröditz GPM58 from a trusted manufacturer. Contact us today for a quote, stock availability, or technical consultation. Let us support your next high-gloss plastic component project with the best steel available.
Frequently Asked Questions (FAQ)
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Q: What is the difference between GPM58 and other mold steels like 1.2343 or 1.2344?
A: GPM58 is a proprietary grade from Gröditz, optimized for high polishability and wear resistance. It is similar to DIN 1.2343 (X40CrMoV5-1) but with tighter micro-cleanliness and finer carbides, resulting in better surface finish and longer tool life for plastic molds. -
Q: Can GPM58 be used for molds with glass fiber reinforced plastics?
A: Yes, GPM58 offers good wear resistance against abrasive fillers. However, for extremely high glass fiber content (>40%), we recommend surface treatments like nitriding or PVD coating to extend lifespan. We can advise on suitability based on your specific application. -
Q: What is the maximum size of block you can supply?
A: We can supply blocks up to 800 mm × 2000 mm in cross-section, and plates up to 400 mm thickness. Custom sizes are available upon request. Please contact us with your dimensional requirements. -
Q: Does the steel require any pre-machining heat treatment?
A: No, GPM58 is supplied in a pre-hardened and tempered condition at 38–42 HRC. It is ready for machining directly. No additional heat treatment is needed unless you desire a higher hardness (optional, consult our technical team). -
Q: How do you ensure the quality of each batch?
A: We follow a TS16969 certified quality system. Each block is accompanied by a mill test certificate from Gröditz, and we perform additional ultrasonic inspection and hardness testing upon receipt. Our QC team verifies dimensional accuracy before shipment. -
Q: What is the typical lead time for an order?
A: For standard sizes in stock, we can ship within 3–7 working days. For custom dimensions or special surface treatments, lead time is typically 10–15 working days. We offer expedited shipping options for urgent needs. -
Q: Can you provide cut-to-size or pre-machined blanks?
A: Yes, we offer cutting services (sawing, milling, grinding) to produce blanks or rough-machined blocks per your drawing. Surface grinding to tolerance is also available. Please inquire for details and pricing. -
Q: Do you offer samples for testing?
A: Yes, we can provide small samples (e.g., 100×100×25 mm) for evaluation. The sample cost is refundable upon placing a full order. Contact us to arrange shipment.
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