| Item | Specification |
| Product Name | Nitrided Screw |
| Material | 38CrMoAlA (JIS SACM645 / DIN 1.8509 Optional) |
| Manufacturing Process | Forging → Rough Machining → Quenching & Tempering → Finish Machining → Gas Nitriding → Precision Grinding & Polishing |
| Screw Diameter | Ø15 mm – Ø300 mm |
| Length | Up to 10,000 mm |
| L/D Ratio | 15:1 – 40:1 (Customized) |
| Surface Hardness | HV 900–1100 (Approx. HRC 67–72) |
| Nitriding Depth | 0.50–0.80 mm |
| Core Hardness | HB 240–300 |
| Surface Roughness | Ra ≤0.4 μm |
| Straightness | ≤0.015 mm/1000 mm |
| Hardness Uniformity | ±30 HV |
| Heat Treatment | Quenching & Tempering + Gas Nitriding |
| Wear Resistance | Excellent |
| Corrosion Resistance | Good |
| Service Life | 2–3 Times Longer Than Standard Steel Screw (Depending on Material & Working Conditions) |
| Applicable Materials | PP, PE, HDPE, LDPE, LLDPE, PVC, ABS, PS, PC, PA, PET, PMMA, EVA, TPR, Rubber Compounds |
| Application | Injection Molding Machine, Extruder, Blow Molding Machine, Rubber Machinery |
Material Chemical Composition (38CrMoAlA)
| Element | Content (%) |
| C | 0.35–0.42 |
| Si | 0.20–0.45 |
| Mn | 0.30–0.60 |
| Cr | 1.35–1.65 |
| Mo | 0.15–0.25 |
| Al | 0.70–1.10 |
| P | ≤0.035 |
| S | ≤0.035 |
Performance Characteristics
| Property | Value |
| Wear Resistance | ★★★★☆ |
| Corrosion Resistance | ★★★☆☆ |
| Fatigue Strength | ★★★★☆ |
| Impact Resistance | ★★★☆☆ |
| Surface Finish | Excellent |
| Dimensional Stability | Excellent |
| Cost Performance | Excellent |
Suitable Industries
| Industry | Application |
| Plastic Injection | Automotive Parts, Household Products, Electronic Components |
| Plastic Extrusion | Pipe, Profile, Sheet, Film |
| Packaging | Caps, Containers, Thin-wall Products |
| Wire & Cable | PE / PVC Insulation |
| Rubber Processing | Rubber Extrusion & Injection |
Optional Surface Treatments
| Treatment | Feature |
| Gas Nitriding | Standard wear resistance |
| Ion Nitriding | Higher hardness and better uniformity |
| Hard Chrome Plating | Improved corrosion resistance |
| Bimetallic Alloy | Severe wear applications |
| Nickel-Based Alloy | High corrosion resistance |
Advantages
- Surface Hardness HV900–1100
- Nitriding Depth 5–0.8 mm
- Excellent Wear Resistance
- Stable Performance Under High Temperature
- Suitable for Most Thermoplastics
- Precision Ground for Smooth Plasticizing
Long Service Life with Lower Maintenance Cost