Premium DIN 1.2311 Plastic Mould Steel, 1.2311 P20 Mould Steel Plate
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Description
DIN 1.2311 Plastic Mould Steel (P20) – Premium Grade Material
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Overview of 2311 Plastic Mould Steel
DIN 1.2311, also widely known as P20 Steel, is a pre-hardened plastic mould steel renowned for its uniform hardness distribution, even in large cross-sections. This grade offers an exceptional balance of toughness, wear resistance, and machinability, making it a top choice for various mould and die applications.
Key Features & Benefits
- Excellent Weldability: Maintains minimal hardness elevation in the heat-affected zone, simplifying post-weld treatments.
- Superior Polishability: Achieves a fine, streak-free mirror finish, reducing finishing time and costs.
- Uniform Hardness: Delivers consistent hardness (240-280 BHN) across the entire cross-section up to 255mm thickness.
- Good Machinability: Pre-hardened condition ensures excellent cutting and machining properties.
Equivalent Grades
The nearest international equivalents to DIN 1.2311 include: P20 (ASTM A681), ASSAB 618, NAK55, and P20+Ni.
Specifications & Chemical Composition
| Standard | Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|---|
| ASTM A681 | P20 | 0.28 – 0.40 | 0.60 – 1.00 | ≤ 0.030 | ≤ 0.030 | 0.20 – 0.80 | 1.40 – 2.00 | 0.30 – 0.55 |
| DIN EN ISO 4957 | 1.2311 | 0.35 – 0.45 | 1.30 – 1.60 | ≤ 0.030 | ≤ 0.030 | 0.20 – 0.40 | 1.80 – 2.10 | 0.15 – 0.25 |
| GB/T 1299 | 3Cr2Mo | Equivalent Chinese Standard | ||||||
Mechanical Properties (Typical Values)
| Property | Metric Value |
|---|---|
| Hardness, Brinell (HB) | 300 (typical) |
| Hardness, Rockwell (HRC) | 30 (typical) |
| Tensile Strength, Ultimate | 965 – 1030 MPa |
| Tensile Strength, Yield | 827 – 862 MPa |
| Elongation at Break (in 50mm) | 20.0% |
| Compressive Strength | 862 MPa |
| Charpy Impact (V-Notch) | 27.1 – 33.9 J |
| Poisson’s Ratio | 0.27 – 0.30 |
| Elastic Modulus | 190 – 210 GPa |
Typical Applications
DIN 1.2311 (P20) is the preferred steel grade for a wide variety of tooling and moulding applications, including:
- Injection moulds for plastic components
- Mould frames and die holders
- Zinc and casting dies
- Backers and bolsters
- Shoe blocks and mould bases
- Pressure casting moulds and recipient sleeves
Heat Treatment Guide
Soft Annealing
| Temperature (°C) | Cooling Method | Hardness (HB) |
|---|---|---|
| 710 – 740 | Furnace | Max. 235 |
Hardening
| Temperature (°C) | Quenching Medium | Hardness (HRC) |
|---|---|---|
| 850 – 880 | Oil or Salt Bath (180 – 220°C) | 52 |
Tempering (after quenching at 850–880°C)
| Tempering Temperature (°C) | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
|---|---|---|---|---|---|---|---|
| Hardness (HRC) | 52 | 50.5 | 48.5 | 46 | 42 | 36.5 | 28 |
Note: The values provided are for reference only. Actual results may vary depending on section size and specific processing parameters.
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