Plastic Mould steel
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Description
Plastic mould steels are supplied in the tempered and pre-hardened condition, typically achieving a tensile strength of ~1000 MPa. The pre-hardened state eliminates the need for subsequent hardening, which is especially advantageous in large mould sections (thickness > 400 mm).
They provide an optimal combination of toughness, dimensional stability, machinability, and wear resistance, making them highly reliable for mould-making applications. Their ability to attain mirror surface finishes and compatibility with EDM (Electrical Discharge Machining) further enhance their performance in precision mould manufacturing.
Popular Grades
- P20+Ni
- P20
- P20 HH
- STAVAX ESR
- AISI P20+Ni
- AISI P20
- DIN 2738
- DIN 2311
Applications
- High-grade mould bases requiring mirror polish and EDM finish
- Bottle crates
- TV housing frames
- Buckets and containers
- Automotive interior/exterior components
- Rubber moulds for industrial applications
- Moulds for electrical, electronic, and audiovisual components
Chemical Composition
| Element | Content (%) |
|---|---|
| C (Carbon) | 0.28 – 0.40 |
| Si (Silicon) | 0.20 – 0.80 |
| Mn (Manganese) | 0.60 – 1.00 |
| Cr (Chromium) | 1.40 – 2.00 |
| Mo (Molybdenum) | 0.30 – 0.55 |
| Ni (Nickel) | 0.90 – 1.20 |
| S (Sulphur, free machining grade only) | ≤ 0.08 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm) | ~1000 – 1200 MPa |
| Yield Strength (Rp0.2) | ~800 – 950 MPa |
| Hardness (HB) | 280 – 340 HB (≈ 30 – 36 HRC) |
| Impact Toughness (ISO-V, longitudinal) | ≥ 30 J |
| Modulus of Elasticity (E) | ~210 GPa |
| Density | ~7.85 g/cm³ |
Product Specifications of Plastic Mould steel
| AISI/ASTM | Material | Chemistry | Application | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EN | DIN | JIS | C | Si | Mn | P | S | Cr | Ni | Mo | ||
| P20 + Ni | 40CrMnNiMo8-6-4 | 1.2738 | PDS-5 | 0.40 | 1.50 | - | - | 1.90 | 1.00 | 0.20 | Used for various large-size mirror plastic mould, precision plastic mould, like: car accessories, home appliances, electronic equipment plastic mould. | |
| P20 | 40CrMnNiMo8-6-4 | 1.2311 | SKT3 | 0.40 | 0.25 | 0.20 | 1.90 | Plastic moulds, mould frames for plastic moulds and pressure casting moulds and recipient sleeves. | ||||
Key Features
- Supplied in tempered and pre-hardened condition
- Tensile strength: ~1000 MPa
- No additional hardening required, even for large mould sections
- High toughness and dimensional stability
- Good machinability and wear resistance
- Excellent mirror polishing properties
- Compatible with EDM machining
Supply Cities
- Agra, Alwar, Ambala, Anand, Bhiwadi, Dehradun,
- Ghaziabad, Haridwar, Rudrapur, Delhi, Faridabad,
- Kanpur, Noida, Gurgaon, Manesar, Kundali,Chandigarh,
- Waluj , Vadodara, Pimpri - Chinchwad, Rajkot, Jaipur,
- Hyderabad, Ernakulam, Chennai, Secunderabad,
- Visakhapatnam, Coimbatore, Mysore, Nellore, Kochi,
- Tirupati, Nazarathpet, Kakinada, Kurnool and many
- Ahmedabad, Pithampur, Surat, Amravati, Vadodara,
- Indore, Bhopal, Ranchi, Jamshedpur, Howrah,Kolkata,
Conclusion
Plastic mould steels are designed to deliver optimum strength, toughness, and machinability to precision mould-making. Delivered in tempered and pre-hardened states with tensile strengths of approximately 1000 MPa, they do not require further hardening, even in large mould sections. Plastic mould steels have a high dimensional stability, wear resistance, and mirror finishing capacity, so they are widely used in injection moulds in automotive, consumer goods, electronics, and industrial applications. The fact that they can be used with EDM and optional nitriding treatments also increases durability and performance in harsh production cycles.
